ALICE, ATLAS, CMS, LHCb, TOTEM, LHCf
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1
2 LHC EXPERIMENTS LHC EXPERIMENTS ALICE, ATLAS, CMS, LHCb, TOTEM, LHCf
3 ACE Antiproton Cell Experiment Antiprotons versus cancer cells Non LHC Experiments ASACUSA Atomic Spectroscopy And Collisions Using Slow Antiprotons, Hybrid atoms straddle the antiworld AEgIS Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy Measuring g with a beam of antihydrogen ATRAP AntihydrogenTRAP, Peer inside atoms of antihydrogen ALPHA AntihydrogenLaser PHysics Apparatus Neutral trap to capture and analyse antihydrogen
4 Non LHC CAST CERN Solar Axion Telescope, Gaze at the Sun for clues to antimatter mystery CLOUD Cosmics Leaving OUtdoor Droplets, Cosmic rays and cloud formation COMPASS COmmon Muon and Proton Apparatus for Structure and Spectroscopy Particles built from quarks and gluons DIRAC DImeson Relativistic Atomic Complex, Pions and the strong force NA61/SHINE: On the origin of hadrons NA62: Measuring rare kaon decays
5 CLOUD EXPERIMENT
6 CLOUD experiment : cosmic rays and cloud dformation CLOUD is an experiment that uses a cloud chamber to study the possible link between galactic cosmic rays and cloud formation. recent CLOUD results show that trace vapors assumed until now to account for aerosol formation in the lower atmosphere can explain li only a tiny fraction of the observed atmospheric aerosol production The results also show that ionization from cosmic rays significantly enhances aerosol formation.
7 LHC based experiments ATLAS ALICE CMS LHCb LHCf TOTEM Standard Model Beyond the Standard Model Quark kgluon Plasma
8 Discovery Measurement TESTING SM and SEARCH of BSM Extra ExtraDimensions Dimensions, (ADD MODEL) Higgs Searches W W Polarization Measurement from top pair events, SUSY Heavy Ion Collision and QGP
9 EXTRA DIMENSIONS
10 Why Extra Dimensions: Hierarchy Problem Planck Scale: GeV Scale at which the gravitational force becomes as strong as the other forces; effects of quantum gravitation become relevant... GUT Scale: GV GeV Unification scale where strong, weak and electromagnetic forces become equal... Electroweak Scale: 10 2 GeV Scale of electroweak symmetry breaking... 10
11 Extra Dimensions: ADD Scenario -If Large Extra Dimensions exist the 4D Planck Scale (M P ) is not a fundamental scale -The 4+n Planck Scale (M S ) is the Fundamental Scale. - To solve the Hierarchy Problem: M S ~ M EW The Planck scale M P ~ G -1/2 is not a fundamental scale; its enormity is simply a consequence of the large size of the new dimensions. While gravitons can freely propagate in the new dimensions, at sub-weak energies the Standard Model SM. Fields must be localized to a 4-dimensional manifold of weak scale thickness in the extra dimensions. ADD Physics Letters B
12 Extra Dimensions: ADD Scenario ADD Physics Letters B The existence of New Spatial Dimensions is proposed. 4 Dimensions hc G ~ 10 M Pl 19 GeV (4+n) Dimensions dim n (4 M ) Pl M S M 2 Pl M 2 n S R n 12
13 Extra Dimensions: ADD Scenario M 2 Pl M 2 n S R By setting M s = 1 TeV n To solve the Hierarchy Problem: M S ~ M EW n 2 2 1/ n R M n Pl / M S 1 70 AU 2 1 mm 3 1 nm 4 10 pm fm 5/26/
14 Exchange of Virtual Gravitons: Di-lepton Production: P+P l+l+x Signal: Two opposite sign same flavor leptons Backgrounds: Irreducible: Standard Model Drell-Yan Other backgrounds: -Top pair (specially dileptonic), WW,WZ,ZZ -Multijet -Photon+Jet 14
15 Data, SM Prediction, and ADD Comparison Virtual graviton exchange: Expect broad enhancement of Drell Yan production Data agrees well with the Standard Model expectations Proceed to set limits
16 Results: Limits [TeV]
17 W POLARIZATION
18
19
20 Angular Distribution
21 Results of Fitting to Data Method FL F0 FR 3D Fitting ± ± ± W helicity fractions are in agreement with the SM predictions W helicity fractions are in agreement with the SM predictions and measured accurately with respect to previous measurements
22 HIGGS
23 Higgs Mass Limits Before LHC The Higgs Mass Limits and Expectation: LEP limit: it S. Schael et al. [ALEPH, DELPHI, L3, OPAL Collaborations and LEP Working Group for Higgs Boson Searches], Eur. Phys. J. C 47 (2006) 547 [arxiv:hep ex/ ]. Global Electroweak Fit Excluded by Tevatron in 2009: Tevatron New Phenomena & Higgs Working Group, arxiv:
24 Higgs Production at Hadron Colliders 24
25 Higgs Decay: Branching Ratio 25
26 Theoretical Cross Section Searchinthree general regions between GeV 26
27
28 Anatomy of an excess: local and global p-values Maximum local significance significance (full mass range: GeV)= significance (low mass range: GeV)= 1.9 The excess we see in the low mass region can be definitely interpreted as a fluctuation of the background
29
30 SUSY
31 SUSY EXCLUSIONS BY CMS
32 QUARK GLUON PLASMA
33 Hadrons (confined) New phase of partons deconfined and thermalised (internal thermodynamical eq.) Heavy Ion Collisions
34 The jets interact strongly with The jets interact strongly with the hot and dense medium of Quark-Gluon plasma, leading to a marked reduction of their energy. This energy reduction is called "jet quenching". Jet Quenching
35 IPM
36 IPM activities in 2011 TOP Measurement of W Polarization in Di Leptonic ttbar Events in pp Collisions with sqrt(s) = 7 TeV Measurement of the b tagging efficiency in the CMS experiment with the first LHC collisions (Jafari + VUB team) Measurement of the Jet Energy Scale in the CMS experiment with the First LHC Proton Collisions (Zeinali + VUB team)q
37 SUSY IPM activities in 2011 W Boson Polarization based leptonic SUSY search (Safarzadeh + Imperial college group) Data Driven Driven prediction of thettbarttbar background using b tagging for the RA2 Inclusive Hadronic SUSY Search (Safarzadeh + Imperial college group) Search hfor supersymmetry in hadronic hd final states tt using M_T2 based on 4.4 fb 1 of CMS data at sqrt(s) = 7 TeV (Paktinat + ETH group) Search hfor New Physics in the Same Sign Si Di Lepton Channel Using 4.98 fb 1 of 7 TeV pp Collisions (Bakhshian + ETH group)
38 IPM activities in 2011 TOP Measurement of W Polarization in Di Leptonic ttbar Events in pp Collisions with sqrt(s) = 7 TeV Measurement of the b tagging g efficiency in the CMS experiment with the first LHC collisions (Jafari + VUB team) Exotic Search for Large Extra Dimensions in Dielectron FinalState in 2011 pp Collisions at sqrt(s) = 7 TeV (Mohammadi + Etesami + Paktinat) Higgs Search for the standard model Higgs boson decaying into tau tau; and WW in association with Z boson (A.Mohammadi + Wisconsin university group)
39 IPM activities in 2011 tau Measurement of the W > \tau \nu cross section in pp collisions at sqrt(s) = 7~TeV (A.Mohammadi) Performance of tau reconstruction algorithms with 2010 data in CMS (A.Mohammadi + Wisconsin university group) Forward physics Measurement of exclusive \pi+ \pi and K+ K productions o (Khakzad) ad)
40 TOP
41 Top Quark
42 Top Quark
43 Top Quark Production
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