ttbar Background Estimation in the Search for b-associated MSSM Higgs Bosons Decaying to Tau-Pairs with ATLAS DPG Bonn, T 45. Higgs
|
|
- Daniella Glenn
- 6 years ago
- Views:
Transcription
1 ttbar Background Estimation in the Search for b-associated MSSM Higgs Bosons Decaying to Tau-Pairs with ATLAS DPG Bonn, T 45. Higgs Jana Schaarschmidt Supervised by Michael Kobel, Wolfgang Mader (TU Dresden) 1 / 15
2 Outline 1. Introduction 2. Idea of ttbar Estimation Procedure 3. Application to 14 TeV and 30 fb Application to 10 TeV and 168 pb Conclusions ttbar background Estimation in the Search for b-associated h/a/h ττ 2 / 15
3 Introduction MSSM Higgs sector in a tiny nutshell Minimal Supersymmetric Standard Model 2 Higgs doublets 5 Higgs bosons: h 0 (CP = +1), H 0 (CP = +1), A 0 (CP = -1), H ± Tree level described by two parameters: Mass degeneracy h, H h, H m A, tanβ = v u /v d Enhanced Couplings to down type fermions σ bbh/a tan 2 β Only one Higgs boson signal generated wih m A and sum of σ b-quark associated production Harlander, Kilgore Phys. Rev. D 68 (2003) Real b-jets in signal process b-tag applied Reduces dijet, Z and W backgrounds Enhances ttbar background (dominant background for m A > 150 GeV) Large uncertainties on ttbar σ ( 10 %) demand for data driven approaches ttbar background Estimation in the Search for b-associated h/a/h ττ 3 / 15
4 Idea of ttbar Estimation Procedure ttbar events show a significantly higher jet multiplicity than all other processes ttbar -> bb WW -> bb leplep + MET or bb qqbar lep + MET 14 TeV Basic object reconstruction applied: Normalized to unity one tau one lepton at least one b-tag Jet p T > 20 GeV Cone 0.4 algorithm ttbar MC: MC@NLO m t = GeV The high multiplicity bins (#jets > 3) contain mostly ttbar events (without further optimization) The low multiplicity bins (#jets=1 2) contain the Higgs boson signal among other processes and ttbar A ttbar control sample is used to estimate the low jet multiplicity shape The high multiplicity tail is used for normalization ttbar background Estimation in the Search for b-associated h/a/h ττ 4 / 15
5 Idea of ttbar Estimation Procedure N ttbar Signal region, njet=1 2 = Nttbar Control,njet=1 2 N ttbar Control,njet high No MC input needed. Therefore applicable to first data. In typical SM or MSSM Higgs analysis cut on the number of jets applied to reduce ttbar background #jets < 3, with jet p T > 20 GeV (Statistical significance is better if 2-jet bin kept in analysis) N ttbar Signal region,njet high Gives only the number of ttbar events in a mass range, not a mass line shape (eg. m ττ ) Independent of ttbar cross section uncertainty Independent of luminosity uncertainty Any systematic effect in signal region will be visible in control region The other backgrounds are agressively reduced by kinematical cuts (p T, m, Φ,...) Method fully applicable if analysis is split in two analysis (1-jet, 2-jet) and combined later. Application to 0-jet bin probably also possible but not done yet. ttbar background Estimation in the Search for b-associated h/a/h ττ 5 / 15
6 Application to 14 TeV and 30 fb -1 Part of new effort to update discovery potential of MSSM H/A ττ in semi leptonic final state using high statistic AtlFast II samples and Athena Release 14. ATLAS Collaboration, Discovery Potential of H/A ττ lephad in ATLAS, note in preparation. ATL-COM-PHYS Construction of ttbar Control Regions: Selection of signal regions m A dependent m A dependent control regions Start from signal region cuts, apply trigger efficiencies, apply tight tau ID (esp. against QCD) Drop tight lepton selection (to reduce W eν, W µν), drop cut on m ττ window, drop coll. approximation requirements, drop cut on number of jets Cut on m R,τ, p T,miss, p T,b-jet to increase ttbar purity Tune cut on m T for best match between jet multiplicity shapes in signal and control region in low multiplicity range if being normalized to high multiplicity range Evaluated single top contribution (t channel and Wt) by using cut factorisation ttbar background Estimation in the Search for b-associated h/a/h ττ 6 / 15 Normalized to Unity Normalized to Unity Atlas work in progress Atlas work in progress
7 Application to 14 TeV and 30 fb -1 - m A = 150 GeV Signal Region m A =150 GeV Control Region m A =150 GeV Comparison only ttbar Signal region m ττ / GeV Normalization ttbar purity: % 5210 ttbar, 157 single top events Result of estimation at m A =150 GeV: N ttbar MC = / (23.0) N ttbar Data = / (23.7) Expected statistical uncertainty includes contributions from all 3 regions (in brackets the real MC uncertainty) ttbar background Estimation in the Search for b-associated h/a/h ττ 7 / 15
8 Application to 14 TeV and 30 fb -1 - m A = 200 GeV Signal Region m A =200 GeV Control Region m A =200 GeV Comparison only ttbar Atlas work in progress m ττ / GeV ttbar purity: % 1726 ttbar, 52 single top events Result of estimation at m A =200 GeV: N ttbar MC = / (23.4) N ttbar Data = / (31.6) ttbar background Estimation in the Search for b-associated h/a/h ττ 8 / 15
9 Application to 14 TeV and 30 fb -1 - m A = 300 GeV Signal Region m A =300 GeV Control Region m A =300 GeV Comparison only ttbar Atlas work in progress m ττ / GeV ttbar purity: % 837 ttbar, 4 single top events Result of estimation at m A =300 GeV: N ttbar MC = / (19.5) N ttbar Data = / (27.0) ttbar background Estimation in the Search for b-associated h/a/h ττ 9 / 15
10 Application to 14 TeV and 30 fb -1 - m A = 450 GeV Signal Region m A =450 GeV Control Region m A =450 GeV Comparison only ttbar Atlas work in progress m ττ / GeV Atlas work in progress ttbar purity: % 340 ttbar, 1 single top events Result of estimation at m A =450 GeV: N ttbar MC = /- 3.8 (6.0) N ttbar Data = /- 3.8 (5.9) ttbar background Estimation in the Search for b-associated h/a/h ττ 10 / 15
11 Application to 14 TeV and 30 fb -1 - Systematic Uncertainties Systematic uncertainties may arise from: - Contaminations of control region and high multiplicity tail of signal region - Influence of detector uncertainties (E scales and resolutions, efficiencies) - Different factorisation scale, influence of Pile-up (both will require cut retuning) Total uncertainties under typical experimental systematic variations: m A 150 GeV 200 GeV 300 GeV 450 GeV Control purity 0.89 % 0.99 % 0.24 % 0.34 % High multiplicity signal purity 5.4 % 3.0 % 1.1 % 1.1 % Total exp. uncertainty 11.9 % % % % (N Data - N MC ) w/o variation 4.4 % 7.8 % 1.9 % % Numbers too conservative due to statistics and pessimistic detector uncertainties Control regions not optimized for best stability against systematic variations Biggest impact from light jet rejection and tau E scale ttbar background Estimation in the Search for b-associated h/a/h ττ 11 / 15
12 Application to 10 TeV and 168 pb -1 The Topmixing excercise All kind of SM backgrounds merged into one sample and MC truth info removed Cross sections scaled by secret factors E = 10 TeV, L = 168 pb -1, Trigger menu according to cm -2 s -1 Data content: W eν, W µν, W τν, Z ee, Z µµ, Z ττ, Wbb, WW, ZZ, tt, single t, Wt Merged into egamma and muon stream QCD events simply added to data and MC (no secret scaling) A loose Higgs boson signal region Looser cuts than in 14 TeV analysis (otherwise no data events expected with 168 pb -1 ) No tight tau ID tau LLH > -10 >= 1 btag #jets=1 2 tight lepton isolation p Tmiss > 35 GeV m T < 40 GeV p T,tau > 20 GeV Φ > 2.3, coll. approx. 1 3 tracks per tau cand. Signalregion tanβ=45 m A =120 GeV Number of events Used for normalization 168 pb TeV Atlas work in progress ttbar background Estimation in the Search for b-associated h/a/h ττ 12 / 15
13 Application to 10 TeV and 168 pb -1 A loose ttbar control region p Tmiss > 100 GeV m T > 50 GeV p T,lep > 40 GeV Number of events 168 pb TeV p T,tau > 50 GeV taullh > -10 (no tight tau ID) >= 1 btag Atlas work in progress ttbar % W lν/τν Wbb Z ττ/ll % 1.1 % 0 % ttbar purity: 83 % ttbar yield: 32 Events WW/ZZ Wt/single t J0-J5 bbh 120 GeV % 5.7 % 0.7 % 0.6 % Factorized single top and QCD σ (10 TeV) / σ (14 TeV): ttbar 49% W 57 % Z 70% ttbar background Estimation in the Search for b-associated h/a/h ττ 13 / 15
14 Application to 10 TeV and 168 pb -1 Results of ttbar estimation Method applicable but statistics on the limit to be used. Exploring different cuts might help. Scaling factors in Topmix data > 1 Tight tau ID is not usable for such little data, instead cut on MET to reduce dijet background Arbitrary Units Comparison of ttbar MC only MC uncertainty Atlas work in progress N MC = N data = Number of events Topmix MC: Expected uncertainty tanβ=45 m A =120 GeV 168 pb TeV Number of events Topmix Data Streams: N data = Atlas work in progress ttbar background Estimation in the Search for b-associated h/a/h ττ 14 / 15
15 Conclusions Studied possibility of data-driven ttbar estimation in the context of the b-associated MSSM h/a/h ττ lephad Use jet multiplicity distribution of a ttbar control region and normalized it to the high jet multiplicity tail in the signal region to estimate the number of ttbar events in a m ττ mass window Jet multiplicity typical instrument for ttbar cross section measurements (eg. CDF publication hep-ex/ ) Method totally independent of the ttbar cross section and therefore its systematic uncertainty Applicable not only to well understood data but also to first data (300 pb -1 with 7 TeV will be sufficient to start this study) ttbar background Estimation in the Search for b-associated h/a/h ττ 15 / 15
16 Back up
17 The ATLAS Detector 46 m length, 24 m diameter 7000 t weight 3000 km cables Luminosity: cm -2 s -1 (10 fb -1 per 14 TeV) Trigger: 10 9 Hz 75 khz 100 MB / s storage ttbar background Estimation in the Search for b-associated h/a/h ττ Backup 1 / 7
18 MSSM 2 Higgs doublets 5 Higgs bosons: h 0, H 0 (CP = +1), A 0 (CP = -1), H ± Tree level decribed by only two parameters: m A, tanβ = v u /v d v u2 +v d2 = v 2 m h < m Z but large loop corrections increase this limit! Couplings: g MSSM = ξ g SM Additional parameters: X t Stop mixing parameter M SUSY Energy scale of SUSY breaking M 2 Gaugino mass at EW scale M~ g Gluino mass at EW scale µ Strength of SUSY Higgs mixing ξ h H A t cosα/sinβ sinα/sinβ cotβ All parameters except tanβ, m A fixed in benchmark scenarios: α = mixing angle between h and H b / τ -sinα/cosβ cosα/cosβ tanβ h/a/h ττ enhanced if tanβ large W / Z sin(α-β) cos(α β) h/h ZZ * suppressed A does not couple to W/Z - m max h : m h < 133 GeV, maximum allowed mass for h nomixing: m h < 116 GeV, no mixing in stop sector gluphobic: m h < 119 GeV, suppressed gg fusion small α: m h < 123 GeV, suppressed ttbar h, h bb m h max considered here Carena, Heinemeyer, Wagner, Weiglein Eur. Phys. J. C26 (2003) pp ttbar background Estimation in the Search for b-associated h/a/h ττ Backup 2 / 7
19 Tau Decay: Tau Reconstruction 35% leptonic (τ e νν / τ µ νν) 65% hadronic (τ π ν / τ ππ ν /...) Probability that tau-pair decays fully leptonic only 12 % (leplep) In 45% of the cases one leptonic and one hadronic decay (lephad) (Plot from Artur Kalinowski) In the remaining 42 % both taus decay hadronically (hadhad) Hadronic taus in the Atlas detector: Collimated calorimeter cluster, low charged tracks multiplicty, Displaced secondary vertex Tau reconstruction is combination from tracker and calorimeter based algorithms Sources for fake taus: QCD jets Electrons Muons ttbar background Estimation in the Search for b-associated h/a/h ττ Backup 3 / 7
20 Collinear Approximation Conditions: Higgs mass large compared to τ mass Higgs boson has non-zero p T p T,miss in the detector due to neutrinos only x = p T,R / p T,τ 0 < x < 1 m m ll ττ = x 1 x 2 No solution if Φ=π cut Φ < 3.0 applied (VBF: cos( Φ)< 0.9 cut Φ < 2.7 applied) leplep Collinearity ttbar background Estimation in the Search for b-associated h/a/h ττ Backup 4 / 7
21 Signal and Control Region Cuts (14 TeV) m A 150 GeV 200 GeV 300 GeV 450 GeV p T,miss > 20 GeV > 20 GeV > 25 GeV > 60 GeV p T,tau GeV > 30 GeV > 50 GeV > 90 GeV Φ Φ p T,tau GeV > 30 GeV > 50 GeV > 90 GeV p T,b-jet > 50 GeV > 60 GeV > 20 GeV > 20 GeV m l,τ > 100 GeV GeV GeV GeV p T,miss > 100 GeV > 100 GeV > 100 GeV > 100 GeV m T - > 10 GeV > 80 GeV > 80 GeV Signal Control ttbar background Estimation in the Search for b-associated h/a/h ττ Backup 5 / 7
22 Experimental Systematic Uncertainties Systematic uncertainties assumed for 10 fb -1 (commonly used numbers in ATLAS): Electron efficiency ± 0.2 % Electron E scale ± 0.2 % Electron resolution E T Muon efficiency ± 1 % Muon pt scale ± 1 % Muon resolution 0.001/p T r Tau efficiency ± 5 % Tau E scale ± 5 % Tau resolution 0.45 E Jet E scale Jet E resolution ± 3 % (10 %, h >3.2) 0.45(0.63) E B-tagging efficiency ± 5 % Light jet rejection ± 10 % Only relevant in lephad ttbar background Estimation in the Search for b-associated h/a/h ττ Backup 6 / 7
23 Systematic Uncertainties - Numbers for 14 TeV, m A =150 GeV ttbar background Estimation in the Search for b-associated h/a/h ττ Backup 7 / 7
Physics with Tau Lepton Final States in ATLAS. Felix Friedrich on behalf of the ATLAS Collaboration
Physics with Tau Lepton Final States in ATLAS on behalf of the ATLAS Collaboration HEP 2012, Valparaiso (Chile), 06.01.2012 The Tau Lepton m τ = 1.8 GeV, heaviest lepton cτ = 87 μm, short lifetime hadronic
More informationVBF SM Higgs boson searches with ATLAS
VBF SM Higgs boson searches with Stefania Xella (for the collaboration) Niels Bohr Institute, Copenhagen University, Denmark E-mail: xella@nbi.dk The observation of a Standard Model Higgs boson produced
More informationRecent Results on New Phenomena and Higgs Searches at DZERO
Recent Results on New Phenomena and Higgs Searches at DZERO Neeti Parashar Louisiana Tech University Ruston, Louisiana U.S.A. 1 Outline Motivation for DØ Run II Detector at Fermilab The Fermilab Tevatron
More informationATLAS-CONF October 15, 2010
ATLAS-CONF-2010-096 October 15, 2010 Data-driven background estimation for the H τ + τ τ h search at 7 TeV with the ATLAS detector Ian Howley 7 December 2010 1 Motivation One of the primary LHC physics
More informationReconstruction and identification of hadronic τ decays with ATLAS
Reconstruction and Identification of Hadronic τ Decays with ATLAS Wolfgang F. Mader 1 1 Institut für Kern- und Teilchenphysik TU Dresden DPG Frühjahrstagung München, March 2009 Outline 1 Introduction 2
More informationSUSY Search Strategies at Atlas and CMS
1 SUSY Search Strategies at Atlas and CMS (Universität Hamburg) for the Atlas and CMS Collaborations All-hadronic SUSY search Leptonic Inclusive SUSY search Reach in the msugra plane supported by: SUSY
More informationMeasurement of the Z ττ cross-section in the semileptonic channel in pp collisions at s = 7 TeV with the ATLAS detector
Measurement of the Z ττ cross-section in the semileptonic channel in pp collisions at s = 7 TeV with the ATLAS detector Sofia Consonni Università di Milano & INFN XCVII Congresso Nazionale della Società
More informationHIGGS Bosons at the LHC
ATLAS HIGGS Bosons at the LHC Standard Model Higgs Boson - Search for a light Higgs at the LHC - Vector boson fusion - Comparison to the Tevatron potential Measurement of Higgs boson parameters The MSSM
More informationBSM Higgs in ATLAS and CMS
BSM Higgs in ATLAS and CMS A.-M. Magnan Imperial College London 11/01/2012, BSM 4 LHC UK Workshop A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/2012 1 / 32 Introduction Extensions to Standard Model:
More informationLa ricerca dell Higgs Standard Model a CDF
La ricerca dell Higgs Standard Model a CDF Melisa Rossi INFN-TS Giornata di seminari INFN Trieste - 7 Luglio 2009 FNAL: Fermi National Accelerator Lab Tevatron currently provides the highest energy proton-antiproton
More informationHiggs Searches at CMS
Higgs Searches at CMS Ashok Kumar Department of Physics and Astrophysics University of Delhi 110007 Delhi, India 1 Introduction A search for the Higgs boson in the Standard Model (SM) and the Beyond Standard
More informationApplication of the Tau Identification Capability of CMS in the Detection of Associated Production of MSSM Heavy Neutral Higgs Bosons Souvik Das
Application of the Tau Identification Capability of CMS in the Detection of Associated Production of MSSM Heavy Neutral Higgs Bosons Souvik Das Cornell University (September 11, 2006) Decays of the Tau
More informationStandard Model physics with taus in ATLAS
Standard Model physics with taus in ATLAS IFJ PAN, Cracow, Poland Why we are interested in taus? Tau leptons play an important role in the physics program of the ATLAS experiment as they are tools in many
More informationRecent ATLAS measurements in Higgs to diboson channels
Recent ATLAS measurements in Higgs to diboson channels Yusheng Wu University of Michigan Institute of Physics, Academia Sinica On behalf of the ATLAS collaboration August 31 st - Higgs Hunting 2016 Introduction
More information14th Lomonosov Conference on Elementary Particle Physics Moscow, 24 August 2009
M. Biglietti University of Rome Sapienza & INFN On behalf of the ATLAS Collaboration 1 14th Lomonosov Conference on Elementary Particle Physics Moscow, 24 August 2009 Theoretically favored candidates for
More informationBSM Higgs Searches at ATLAS
BSM Higgs Searches at ATLAS Martin zur Nedden Humboldt-Universität zu Berlin for the ATLAS Collaboration SUSY Conference 2014 Manchester July 20 th July 25 th, 2014 Introduction Discovery of a scalar Boson
More informationUpgrade of ATLAS and CMS for High Luminosity LHC: Detector performance and Physics potential
IL NUOVO CIMENTO 4 C (27) 8 DOI.393/ncc/i27-78-7 Colloquia: IFAE 26 Upgrade of ATLAS and CMS for High Luminosity LHC: Detector performance and Physics potential M. Testa LNF-INFN - Frascati (RM), Italy
More informationHiggs Searches with taus in the final state in ATLAS
Higgs Searches with taus in the final state in ATLAS (University of Washington) Terascale Workshop: Interpreting emerging Higgs data @ Uni of Oregon With many thanks to Anna Goussiou, J. Keller, M. Beckingham,
More informationATLAS Discovery Potential of the Standard Model Higgs Boson
ATLAS Discovery Potential of the Standard Model Higgs Boson Christian Weiser University of Freiburg (on behalf of the ATLAS Collaboration) 14th Lomonosov Conference on Elementary Particle Physics Moscow,
More informationHiggs Search with the CMS detector at LHC. Satyaki Bhattacharya
Higgs Search with the CMS detector at LHC Satyaki Bhattacharya data taking starts 2007 Startup Luminosity 2X10 33 cm -2 /s that is: 20 fb -1 per year Silicon Tracker δ p T p T 15 p ( TeV)% T PbWO 4 ECAL
More informationSearching for Supersymmetry at the LHC David Stuart, University of California, Santa Barbara. CMS SUSY Search, D. Stuart, June 2011, Lisbon!
Searching for Supersymmetry at the LHC David Stuart, University of California, Santa Barbara CMS SUSY Search, D. Stuart, June 2011, Lisbon! 1! Searching for Supersymmetry at the LHC David Stuart, University
More informationPHYS 5326 Lecture #23
PHYS 5326 Lecture #23 Monday, Apr. 21, 2003 Dr. Backgrounds to Higgs Searches Requirement on Experiments for Higgs Searches 1 Announcement Semester project presentation 1:00 4:00pm, Wednesday, May 7 in
More informationHiggs Boson in Lepton Decay Modes at the CMS Experiment
Higgs Boson in Lepton Decay Modes at the Experiment Somnath Choudhury 1 for the collaboration 1 DESY - Hamburg, Germany DOI: http://dx.doi.org/1.34/desy-proc-14-4/1 The results on the standard model Higgs
More informationTitle Text. ATLAS Higgs Boson Discovery Potential
Title Text ATLAS Higgs Boson Discovery Potential Isabelle Wingerter-Seez - LAPP - Annecy isabelle.wingerter@lapp.in2p3.fr Corfu Summer Institute September 2009 1 Title Text ATLAS Standard Model Higgs Boson
More informationATLAS Searches for Higgs Bosons Beyond the Standard Model
ATLAS Searches for Higgs Bosons Beyond the Standard Model Trevor Vickey University of the Witwatersrand, South Africa University of Oxford, United Kingdom on behalf of the ATLAS Collaboration July 28,
More informationLight Higgs Discovery Potential with ATLAS, Measurements of Couplings and
Light Higgs Discovery Potential with ATLAS, Measurements of Couplings and Impact on Model Discrimination Junichi TANAKA ICEPP, Univ. of TOKYO On behalf of the ATLAS Collaboration 12th June, 2006 SUSY06@UCIrvine
More informationStudy of supersymmetric tau final states with Atlas at LHC: discovery prospects and endpoint determination
Study of supersymmetric tau final states with Atlas at LHC: discovery prospects and endpoint determination University of Bonn Outlook: supersymmetry: overview and signal LHC and ATLAS invariant mass distribution
More informationSearches for exotica at LHCb
Searches for exotica at LHCb Lorenzo Sestini Università di Padova e INFN LHCb Implications Workshop, Geneve-Cern, 3-11-2015 Searches for exotics LHCb can be complementary to ATLAS and CMS in the search
More informationMeasurements of Fermionic Couplings of the Standard Model Higgs Boson using the bb, ττ and µµ Decay Channels with the ATLAS Detector
Measurements of Fermionic Couplings of the Standard Model Higgs Boson using the bb, ττ and µµ Decay Channels with the ATLAS Detector International Europhysics Conference on High Energy Physics Venice,
More informationSEARCHES FOR THE NEUTRAL HIGGS BOSONS OF THE MSSM
SEARCHES FOR THE NEUTRAL HIGGS BOSONS OF THE MSSM USING LEP DATA Elizabeth Locci SPP/DAPNIA Saclay Representing LEP Collaborations 1 Outline LEP performance Theoretical framework Search for neutral Higgs
More informationDiscovery potential of the SM Higgs with ATLAS
Discovery potential of the SM Higgs with P. Fleischmann On behalf of the Collaboration st October Abstract The discovery potential of the Standard Model Higgs boson with the experiment at the Large Hadron
More informationSearch for Higgs to tt at CMS
Search for Higgs to tt at CMS Arun Nayak IRFU/SPP, CEA, Saclay 11/10/2013 Aperos du SPP 1 Why Higgs to tt? Introduction Most sensitive channel to probe lepton couplings o Important to establish SM predictions
More informationHIGGS + 2 JET PRODUCTION AT THE LHC
IGGS + 2 JET PRODUCTION AT TE LC Dieter Zeppenfeld Universität Karlsruhe, Germany Seminar at KITP, Santa Barbara, March 13, 2008 LC goals Vector boson fusion Measurement of iggs couplings jj production
More informationEvidence for Higgs Boson Decays to a Pair of τ-leptons
Evidence for Higgs Boson Decays to a Pair of τ-leptons ET miss = 119 GeV μ (pt=6 GeV) τhad (pt=96 GeV) mττ =19 GeV Nils Ruthmann mjj =65 GeV Nils Ruthmann (Universität Freiburg) On Behalf of the ATLAS
More informationTwo Higgs Doublets Model
Two Higgs Doublets Model g-2 muon anomaly in a 2HDM(II) loop vertex corrections h,a Kinoshita et al. : 5-loops => 12000 diagrams!! Discrepancy between SM and EXP. F. Jegerlehner and A. Nyeler, Phys. Rept.
More informationHiggs and Z τ + τ in CMS
Higgs and Z τ + τ in CMS Christian Veelken for the CMS Collaboration Moriond EWK Conference, March 14 th 2011 Z τ + τ - Production @ 7 TeV τ + Z τ - CMS Measurement of Z/γ* l + l -, l = e/µ: σ BR(Z/γ*
More informationEarly physics with Atlas at LHC
Early physics with Atlas at LHC Bellisario Esposito (INFN-Frascati) On behalf of the Atlas Collaboration Outline Atlas Experiment Physics goals Next LHC run conditions Physics processes observable with
More informationElectroweak Physics at the Tevatron
Electroweak Physics at the Tevatron Adam Lyon / Fermilab for the DØ and CDF collaborations 15 th Topical Conference on Hadron Collider Physics June 2004 Outline Importance Methodology Single Boson Measurements
More informationLepton Flavour Violation at ATLAS & CMS
Lepton Flavour Violation at ATLAS & CMS Shikma Bressler on behalf of the ATLAS & CMS collaborations H τμ/τe/μe Z τμ/τe/μe Heavy X τμ/τe/μe Others 1 LHC results Library Higgs decays Experiment Process s
More informationIdentification of the Higgs boson produced in association with top quark pairs in proton-proton
Identification of the Higgs boson produced in association with top quark pairs in proton-proton collision: an analysis of the final state containing three leptons with the ATLAS detector Valentina Vecchio,
More informationLight Charged Higgs Discovery Potential of CMS in. A. Nikitenko, M. Hashemi, Imperial College, IPM & Sharif Univ. of Tech.
Light Charged Higgs Discovery Potential of CMS in the H ± τν Decay A. Nikitenko, M. Hashemi, Imperial College, IPM & Sharif Univ. of Tech. London Tehran Outline: Signal and background identification Signal
More informationDmitri Sidorov Oklahoma State University On behalf of the ATLAS Collaboration DIS2014, 04/28/2014
Dmitri Sidorov Oklahoma State University On behalf of the ATLAS Collaboration DIS4, 4/8/4 Introduc)on We discovered a Standard Model (SM) like Higgs boson at mh=5 GeV. This is not the end of the story.
More informationTau Lepton Reconstruction in ATLAS. Tau 2016 Conference, Beijing, 21st September 2016
Tau Lepton Reconstruction in ATLAS Tau 2016 Conference, Beijing, 21st September 2016 Cristina Galea Nikhef/RU Nijmegen presented by: Daniele Zanzi University of Melbourne Tau lepton properties Mass = 1.78
More informationHow to find a Higgs boson. Jonathan Hays QMUL 12 th October 2012
How to find a Higgs boson Jonathan Hays QMUL 12 th October 2012 Outline Introducing the scalar boson Experimental overview Where and how to search Higgs properties Prospects and summary 12/10/2012 2 The
More informationATLAS Run 2 Higgs Prospects
ATLAS Run 2 Higgs Prospects Jessica Levêque LAPP Annecy-le-Vieux CNRS/IN2P3 on behalf of The ATLAS Collaboration Outline ATLAS Upgrades during LS1 ATLAS readiness First physics results with Run 2 data
More informationHiggs Searches and Properties Measurement with ATLAS. Haijun Yang (on behalf of the ATLAS) Shanghai Jiao Tong University
Higgs Searches and Properties Measurement with ATLAS Haijun Yang (on behalf of the ATLAS) Shanghai Jiao Tong University LHEP, Hainan, China, January 11-14, 2013 Outline Introduction of SM Higgs Searches
More informationHiggs searches in TauTau final LHC. Simone Gennai (CERN/INFN Milano-Bicocca) Mini-workshop Higgs Search at LHC Frascati, March 28th, 2012
Higgs searches in TauTau final states @ LHC Simone Gennai (CERN/INFN Milano-Bicocca) Mini-workshop Higgs Search at LHC Frascati, March 28th, 2012 1 Motivations Why looking at H->TauTau? second highest
More informationSearches for SM H ττ at the LHC
Searches for SM H ττ at the LHC M.Bachtis University of Wisconsin-Madison On behalf of the ATLAS and CMS Collaborations arxiv:1202.4083, ATLAS-CONF-2012-014 CMS PAS HIG-12-006, HIG-12-007 Introduction
More informationHiggs Boson Searches at ATLAS
Higgs Boson Searches at ATLAS Jianming Qian University of Michigan October 5, 2011 Maryland/John Hopkins Joint Seminar, October 5, 2011 Jianming Qian (University of Michigan) 1 Standard Model Standard
More informationSearch for a heavy scalar boson decaying into a pair of Z bosons in the 2l2ν final state in CMS
Search for a heavy scalar boson decaying into a pair of Z bosons in the 2l2ν final state in CMS Li Yuan Beihang University CLHCP 2016 December 18, 2016 1 Outline Introduction Overview Analysis Strategy
More informationEvidence for tth production at ATLAS
Evidence for tth production at ATLAS Rohin T Narayan on behalf of the ATLAS collaboration Nov-6-2017, Higgs couplings Heidelberg Motivation Fermion masses are generated through Yukawa interaction Heaviest
More informationHL-LHC Physics with CMS Paolo Giacomelli (INFN Bologna) Plenary ECFA meeting Friday, November 23rd, 2012
@ HL-LHC Physics with CMS Paolo Giacomelli (INFN Bologna) Plenary ECFA meeting Friday, November 23rd, 2012 Many thanks to several colleagues, in particular: M. Klute and J. Varela Outline Where we stand
More informationSearch for the Standard Model Higgs Boson in H WW lν lν with the ATLAS experiment
Search for the Standard Model Higgs Boson in H WW lν lν with the ATLAS experiment MCTP Symposium 2012, University of Michigan, Ann Arbor, US Outline SM Higgs Boson production and decay Analysis based on
More informationHiggs-related SM Measurements at ATLAS
Higgs-related SM Measurements at ATLAS Junjie Zhu University of Michigan 2 nd MCTP Spring Symposium on Higgs Boson Physics Outline Introduction Isolated γγ cross section (37 pb -1, Phys. Rev. D 85, 012003
More informationSearching for the Higgs at the Tevatron
Searching for the Higgs at the Tevatron 5 th May 2009 Particle Physics Seminar, Oxford Outline Introduction The challenges and analysis strategies Low mass SM Higgs searches High mass SM Higgs searches
More informationSearches for New Physics with Tau Leptons at the ATLAS Detector. Katharine Leney University of the Witwatersrand
Searches for New Physics with Tau Leptons at the ATLAS Detector Katharine Leney University of the Witwatersrand Overview Introduction: ATLAS and the LHC The Standard Model and beyond Tau leptons ATLAS
More informationHiggs search prospects at LHC
Higgs search prospects at LHC Rebeca González Suárez IFCA On behalf of the ATLAS and CMS Collaborations 26 June 2010 BEACH 2010 - IX International Conference on Hyperons, Charm and Beauty Hadrons University
More informationElectroweak results. Luca Lista. INFN - Napoli. LHC Physics
Electroweak results Luca Lista INFN - Napoli EWK processes at LHC p p W and Z production in pp collisions proceeds mainly form the scattering of a valence quark with a sea anti-quark The involved parton
More informationATLAS Di-fermion Results. Koji Nakamura (KEK) on behalf of ATLAS Collaboration
ATLAS Di-fermion Results Koji Nakamura (KEK) on behalf of ATLAS Collaboration 30th July, 2015 Higgs 2015 1 Motivation Higgs boson has been observed by Bosonic decay channels (i.e. γγ,zz,ww) Loop process
More informationThe ATLAS discovery potential for MSSM neutral Higgs bosons decaying to a µ + µ pair in the mass range up to 130 GeV
ATLAS COLLABORATION The ATLAS discovery potential for MSSM neutral Higgs bosons decaying to a µ + µ pair in the mass range up to 13 GeV SN-ATLAS-27-63 17 May 27 Simonetta Gentile 1 Halina Bilokon 2, Vitaliano
More informationHeavy MSSM Higgses at the LHC
Heavy MSSM Higgses at the LHC P.Vanlaer, IIHE Brussels (CMS), for the Atlas and CMS collaborations SUSY02, Hamburg, June 17-23, 2002 Outline LHC, Atlas and CMS A,H H + Conclusions SUSY02, Hamburg, June
More informationGeorges Aad For the ATLAS and CMS Collaboration CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
Georges Aad For the ATLAS and CMS Collaboration CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France 5th Large Hadron Collider Physics Conference May 2017, Shanghai Jiao Tong University, Shanghai
More informationSearches for SUSY in Final States with Photons
SUSY4: The nd International Conference on Supersymmetry and Unification of Fundamental Interactions" -6 July 4, Manchester, England" Searches for SUSY in Final States with Photons On Behalf of the CMS
More informationSome Thoughts on What Else to Trigger with the FTK
Some Thoughts on What Else to Trigger with the FTK Beate Heinemann, University of Liverpool Sbottom Stop Bs->mumu Other rare B decays Summary ATLAS FTK Meeting, 04/21/2005 Disclaimer: these are just a
More informationBeyond the Standard Model Higgs boson searches using the ATLAS etector
EPJ Web of Conferences 95, 47 (5) DOI:.5/ epjconf/ 5947 C Owned by the authors, published by EDP Sciences, 5 Beyond the Standard Model Higgs boson searches using the ATLAS etector I.I. Tsukerman the ATLAS
More informationSearch for the SM Higgs boson in the tth lνb jjb bb channel (m H =120 GeV/c 2 )
Search for the SM Higgs boson in the tth lνb jjb bb channel (m H =120 GeV/c 2 ) Georges Aad, Lorenzo Feligioni, Alexandre Rozanov, Laurent Vacavant, Jean-Baptiste de Vivie Physique ATLAS France Seignosse
More informationPhysics at Tevatron. Koji Sato KEK Theory Meeting 2005 Particle Physics Phenomenology March 3, Contents
Physics at Tevatron Contents Koji Sato KEK Theory Meeting 5 Particle Physics Phenomenology March 3, 5 mass measurement Top physics cross section Top mass measurement SM Higgs search Tevatron Run II Started
More informationHiggs Signals and Implications for MSSM
Higgs Signals and Implications for MSSM Shaaban Khalil Center for Theoretical Physics Zewail City of Science and Technology SM Higgs at the LHC In the SM there is a single neutral Higgs boson, a weak isospin
More informationHiggs couplings and mass measurements with ATLAS. Krisztian Peters CERN On behalf of the ATLAS Collaboration
Higgs couplings and mass measurements with ATLAS CERN On behalf of the ATLAS Collaboration July observation: qualitative picture A single state observed around ~125 GeV Qualitatively all observations consistent
More informationSearch for Fermionic Higgs Boson Decays in pp Collisions at ATLAS and CMS
Higgs boson searches in fermionic final state at LHC Search for Fermionic Higgs Boson Decays in pp Collisions at ATLAS and CMS Romain Madar on behalf of ATLAS and CMS collaboration Physikalisches Institut
More informationHiggs Prospects for future (HL)LHC runs
ATLAS & CMS Higgs Prospects for future (HL)LHC runs L 3000 fb-1 Rencontres du Vietnam 2014 O. Arnaez CERN tme 1/21 Introduction Search and discovery of the Brout-Englert-HiggsGuralnik-Hagen-Kibble boson,
More informationHiggs and New Physics at ATLAS and CMS
Higgs and New Physics at ATLAS and CMS F. Malek, LPSC-Grenoble for the ATLAS and CMS Collaborations 56th International Winter Meeting on Nuclear Physics 22-26 January 2018, Bormio-Italy ATLAS and CMS experiments
More informationSearch for the Standard Model Higgs boson decaying to b quark with CMS experiment
Search for the Standard Model Higgs boson decaying to b quark with CMS experiment Silvio Donato 1 2 3 4 on behalf of the CMS Collaboration 1 Scuola Normale Superiore, Piazza dei Cavalieri, 7-56126, Pisa,
More informationSearch for Resonant Slepton Production with DØ
Overview Search for Resonant Slepton Production with DØ Christian Autermann, III. Phys. Inst. A, RWTH Aachen Event Topology Data Selection and Efficiencies Control Plots Selection Optimization Preliminary
More informationPerformance of muon and tau identification at ATLAS
ATL-PHYS-PROC-22-3 22/2/22 Performance of muon and tau identification at ATLAS On behalf of the ATLAS Collaboration University of Oregon E-mail: mansoora.shamim@cern.ch Charged leptons play an important
More informationPhysics at Hadron Colliders
Physics at Hadron Colliders Part 2 Standard Model Physics Test of Quantum Chromodynamics - Jet production - W/Z production - Production of Top quarks Precision measurements -W mass - Top-quark mass QCD
More informationReview of ATLAS experimental results (II)
Review of ATLAS experimental results (II) Rachid Mazini Academia Sinica Taiwan CTEQ 2012 summer school Lima, Peru 30 July -8 August Rachid Mazini, Academia Sinica 1 Outline part II Higgs searches H, H
More informationOutline: Introduction Search for new Physics Model driven Signature based General searches. Search for new Physics at CDF
PE SU Outline: Introduction Search for new Physics Model driven Signature based General searches R Search for new Physics at CDF SUperSYmmetry Standard Model is theoretically incomplete SUSY: spin-based
More informationThe Compact Muon Solenoid Experiment. CMS Note. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland. R. Kinnunen
Available on CMS information server CMS NOE 2003/006 he Compact Muon Solenoid Experiment CMS Note Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland 24 March 2003 Study of H ττ with hadronic τ decays
More informationStudy of Higgs boson leptonic decay modes
Study of Higgs boson leptonic decay modes Windows on the Universe ICSE, Vietnam 11-17.08.2013 Pawel Brückman de Renstrom on behalf of the ATLAS, CMS, CDF, D0 Collaborations ( Institute of Nuclear Physics
More informationSearch for Higgs Bosons at LEP. Haijun Yang University of Michigan, Ann Arbor
Search for Higgs Bosons at LEP Haijun Yang University of Michigan, Ann Arbor L3 On behalf of the L3 Collaboration American Physical Society Meeting(APS03), Philadelphia April 5-8, 2003 OUTLINE Introduction
More informationKoji TSUMURA (NTU à Nagoya U.)
Koji TSUMURA (NTU à Nagoya U.) Toyama mini WS 20-21/2/2012 S. Kanemura, K. Tsumura and H. Yokoya, arxiv:1111.6089 M. Aoki, S. Kanemura, K. Tsumura and K. Yagyu, Phys. Rev. D80 015017 (2009) Outline The
More informationThe study of the properties of the extended Higgs boson sector within hmssm model
The study of the properties of the extended Higgs boson sector within hmssm model T.V. Obikhod, E.A. Petrenko Institute for Nuclear Research, National Academy of Science of Ukraine 47, prosp. Nauki, Kiev,
More informationSearching for additional Higgs bosons at the CERN Large Hadron Collider
Searching for additional Higgs bosons at the CERN Large Hadron Collider Trevor Vickey University of Sheffield, United Kingdom November 21, 2017 HEP Seminar University of Oxford We have one 125 GeV Higgs
More informationHiggs Prospects at the Upgraded Tevatron: Fermilab Study Results
Higgs Prospects at the Upgraded Tevatron: Fermilab Study Results John D. Hobbs for the Fermilab RunII SUSY/Higgs Working Group SUNY Stony Brook Preliminary results from a Fermilab study of the sensitivity
More informationKoji TSUMURA (NTU Nagoya U.) KEK 16-18/2/2012
Koji TSUMURA (NTU Nagoya U.) @ KEK 16-18/2/2012 Outline: -Two-Higgs-doublet model -Leptophilic Higgs boson S. Kanemura, K. Tsumura and H. Yokoya, arxiv:1111.6089 M. Aoki, S. Kanemura, K. Tsumura and K.
More informationHiggs search in WW * and ZZ *
Higgs search in WW * and ZZ * Emanuele Di Marco on behalf of CMS collaboration La Sapienza Università di Roma & INFN Roma1 July, 29 2011 1 Higgs production at LHC gluon fusion (gg H) gg H is the dominant
More informationSearching for the Higgs at the LHC
Searching for the Higgs at the LHC Philip Lawson Boston University - PY 898 - Special Topics in LHC Physics 3/16/2009 1 Outline Theory & Background of Higgs Mechanism Production Modes Decay Modes - Discovery
More informationHiggs Boson Physics at the Tevatron
Higgs Boson Physics at the Tevatron Koji Sato On Behalf of CDF and D0 Collaborations Windows on the Universe Qui Nhon, August 14, 2013 1 Tevatron Run II p p collisions at s = 1.96 TeV (1.8 TeV in Run I).
More informationPoS(EPS-HEP2011)250. Search for Higgs to WW (lνlν, lνqq) with the ATLAS Detector. Jonas Strandberg
with the ATLAS Detector Royal Institute of Technology, KTH, Stockholm, Sweden E-mail: jostran@kth.se Higgs boson searches in the H WW ( ) lνlν (l = e, µ) and the H WW ( ) lνqq decay modes, using. fb of
More informationStrategy for early SUSY searches at ATLAS
SUSY07 The 15th International Conference on Supersymmetry and the Unification of Fundamental Interactions Karlsruhe, Germany Strategy for early SUSY searches at ATLAS July 26, 2007 Shimpei Yamamoto (ICEPP,
More informationMulti-Boson Interactions CMS HL-LHC Multi-boson Physics Prospect
Multi-Boson Interactions CMS HL-LHC Multi-boson Physics Prospect J. Lauwers on behalf of the CMS collaboration University of Antwerp MBI 2016 - Madison, Wisconsin - 26 August 1 J. Lauwers CMS Run 2 and
More informationSearches for Supersymmetry at ATLAS
Searches for Supersymmetry at ATLAS Renaud Brunelière Uni. Freiburg On behalf of the ATLAS Collaboration pp b b X candidate 2 b-tagged jets pt 52 GeV and 96 GeV E T 205 GeV, M CT (bb) 20 GeV Searches for
More informationSearch for MSSM neutral Higgs, h 0 /A, boson decaying in muon pair in mass region < 130 GeV: Methods & Sample
Search for MSSM neutral Higgs, h 0 /A, boson decaying in muon pair in mass region < 130 GeV: Methods & Sample Halina Bilokon, Vitaliano Chiarella, Simonetta Gentile, Giovanni Nicoletti Laboratori Nazionali
More informationPDF Studies at LHCb! Simone Bifani. On behalf of the LHCb collaboration. University of Birmingham (UK)
PDF Studies at LHCb! Simone Bifani University of Birmingham (UK) On behalf of the LHCb collaboration MENU 213 Rome 3th September - 4th October 213 Outline Introduction Analyses» Z/γ* ll, l =, e, τ#» W
More informationFirst two sided limit on BR(B s μ + μ - ) Matthew Herndon, University of Wisconsin Madison SUSY M. Herndon, SUSY
First two sided limit on BR(B s μ + μ - ) Matthew Herndon, University of Wisconsin Madison SUSY 2011 M. Herndon, SUSY 2011 1 B s(d) μ + μ - Beyond the SM Indirect searches for new physics Look at processes
More informationTop Quark Production at the LHC. Masato Aoki (Nagoya University, Japan) For the ATLAS, CMS Collaborations
Top Quark Production at the LHC Masato Aoki (Nagoya University, Japan) For the ATLAS, CMS Collaborations Phys. Rev. D 83 (2011) 091503, Phys. Rev. D 82 (2010) 054018, Phys. Rev. D 81 (2010) 054028, Comput.
More informationHiggs Searches - Overview. Kétévi A. Assamagan BNL
Higgs Searches - Overview Kétévi A. Assamagan BNL Outline SM Higgs MSSM Higgs Mass and coupling measurements Les Houches, June 11, 2009 Ketevi A. Assamagan 2 Improvement in Higgs Studies at the LHC Many
More informationThe Compact Muon Solenoid Experiment. Conference Report. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland
Available on CMS information server CMS CR -2013/016 The Compact Muon Solenoid Experiment Conference Report Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland 18 January 2013 (v2, 21 January 2013)
More informationSearch for Higgs beyond the Standard Model with the ATLAS & CMS Detectors Rencontres du Vietnam, Quy Nhon Nikolina Ilic on behalf of the ATLAS and
Search for Higgs beyond the Standard Model with the ATLAS & CMS Detectors Rencontres du Vietnam, Quy Nhon Nikolina Ilic on behalf of the ATLAS and CMS Collaborations Radboud University Aug 8, 2018 Outline
More information