Search for Fermionic Higgs Boson Decays in pp Collisions at ATLAS and CMS
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1 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 Albert-Ludwigs-Universität, Freiburg Germany Physics In Collision Conference Beijing, China 4th of September 2013 Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 1 / 39
2 The Higgs boson in a nutshell Fundamental interest : The Higgs boson is the relic particle of the Electroweak symmetry breaking : SU(2) L U(1) Y U(1) em (Lagrangian symmetry) (Vacuum symmetry) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 2 / 39
3 The Higgs boson in a nutshell Fundamental interest : The Higgs boson is the relic particle of the Electroweak symmetry breaking : SU(2) L U(1) Y U(1) em (Lagrangian symmetry) (Vacuum symmetry) Status of couplings between the Higgs boson and other fields? Direct observation of bosonic decays Direct evidence of fermionic decays Indirect observation of coupling to fermion (loop-induced production) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 2 / 39
4 The Higgs boson in a nutshell Fundamental interest : The Higgs boson is the relic particle of the Electroweak symmetry breaking : SU(2) L U(1) Y U(1) em (Lagrangian symmetry) (Vacuum symmetry) Status of couplings between the Higgs boson and other fields? Direct observation of bosonic decays Direct evidence of fermionic decays Indirect observation of coupling to fermion (loop-induced production) Key role of direct fermionic coupling : Reduce experimental uncertainties on coupling & branching ratios Disantangle potential new physics from SM coupling in loops Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 2 / 39
5 1. Production of H(125) σ tot (H) = 22.1 pb σ tot (Z) 10 4 pb Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 3 / 39
6 1. Production of H(125) σ tot (H) = 22.1 pb σ tot (Z) 10 4 pb 2. Decays of H(125) (emphasis on fermionic decay) bb decay : largest BR, benefits from additional lepton to reduce pp b b + X. ττ decay : lower BR, cleaner signature cc decay : impossible in hadron collider µµ decay : extremely low BR (0.02%), good mass resolution Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 3 / 39
7 Key particles identification (1/2) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 4 / 39
8 Key particles identification (1/2) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 4 / 39
9 Key particles identification (2/2) Based on b-hadron properties : cτ few mm, higher mass Displaced vertex of high mass Semi-leptonic decay Background : c-hadrons Algorithm : multivariate techniques to exploit all these properties and their correlations ( 5 input variables). Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 5 / 39
10 Key particles identification (2/2) Based on b-hadron properties : cτ few mm, higher mass Displaced vertex of high mass Semi-leptonic decay Background : c-hadrons Algorithm : multivariate techniques to exploit all these properties and their correlations ( 5 input variables). Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 5 / 39
11 Overview. 1 Search for H bb decay. 2 Search for H ττ decay. 3 Search for H µµ decay. 4 Dedicated searches for tth production Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 6 / 39
12 ATLAS and CMS analyses overview.. Analyzed integrated luminosity (fb 1 ) of 7 and 8 TeV collisions bb final state ττ final state ATLAS CMS GGF - - VBF VH tth ATLAS CMS GGF VBF VH tth (bold : most sensitive process, gray : impossible to extract from background) + inclusive search in the µµ final state in ATLAS (20.7) Documentation : ATLAS H ττ : GGF+VBF ATLAS H bb : VH, tth ATLAS H µµ : inclusive CMS H ττ : GGF+VBF, VH CMS H bb : VH, VBF CMS tth : ττ and bb Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 7 / 39
13 Search for H bb decay Overview. 1 Search for H bb decay. 2 Search for H ττ decay. 3 Search for H µµ decay. 4 Dedicated searches for tth production Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 8 / 39
14 Search for H bb decay Search for H bb Which production mode for bb final state? All but gluon fusion σ tot (b b) 10 7 pb Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 9 / 39
15 Search for H bb decay Search for H bb Which production mode for bb final state? All but gluon fusion σ tot (b b) 10 7 pb Relevant observable : m bb Refined energy scale and resolution for b-jets jet kinematics soft lepton properties... Improvement : 10 15% References : ATLAS-CONF , CMS PAS HIG , CMS PAS HIG Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 9 / 39
16 Search for H bb decay VH production 1. Analysis strategy : number of leptons vector boson decay Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 10 / 39
17 Search for H bb decay VH production 1. Analysis strategy : number of leptons vector boson decay 2. Standard Model backgrounds : top quark production W/Z + bb production - same final state as signal W/Z + u/d/s/c (fake b-jet) Multijets production (fake/non isolated lepton and b-jet) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 10 / 39
18 Search for H bb decay VH production 1. Analysis strategy : number of leptons vector boson decay 2. Standard Model backgrounds : top quark production W/Z + bb production - same final state as signal W/Z + u/d/s/c (fake b-jet) Multijets production (fake/non isolated lepton and b-jet) 3. Main kinematic handles : m bb reconstruction (look for a bump in m bb distribution) Transverse momentum of vector boson (higher S/ B at high p V T ) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 10 / 39
19 Search for H bb decay Controlling the background General approach : global fit of data over several categories of different background composition (n l, p V T, n b jets) background normalization & shape account for signal contamination include systematics uncertainties (b-tagging, Jet Energy Scale,...) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 11 / 39
20 Search for H bb decay Controlling the background General approach : global fit of data over several categories of different background composition (n l, p V T, n b jets) background normalization & shape account for signal contamination include systematics uncertainties (b-tagging, Jet Energy Scale,...) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 11 / 39
21 Search for H bb decay Signal extraction Strategy : exploit topology differences between signal and background Properties of (b, b) system (mass, angle, color connection,...) Direction of E/ T relative to (b, b) system Consistency of (E/ T, l) system as coming from W decay ATLAS : cut then look at m bb ; CMS : MVA (+cut based as cross check) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 12 / 39
22 Search for H bb decay Signal extraction Strategy : exploit topology differences between signal and background Properties of (b, b) system (mass, angle, color connection,...) Direction of E/ T relative to (b, b) system Consistency of (E/ T, l) system as coming from W decay ATLAS : cut then look at m bb ; CMS : MVA (+cut based as cross check) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 12 / 39
23 Search for H bb decay Method validation.. All these technics can be applied to extract VZ( bb) production (very similar signature), as a validation of the experimental method. Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 13 / 39
24 Search for H bb decay Method validation.. All these technics can be applied to extract VZ( bb) production (very similar signature), as a validation of the experimental method. Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 13 / 39
25 Search for H bb decay Results of VH(bb) search (1/3) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 14 / 39
26 Search for H bb decay Results of VH(bb) search (2/3) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 15 / 39
27 Search for H bb decay Results of VH(bb) search (3/3) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 16 / 39
28 Search for H bb decay Vector boson fusion production 1. Analysis strategy : look at qqbb final state Dedicated 4jets triggers exploiting VBF topology (high η jj ) Select 2 forward jets with high m jj also specific to the VBF production Apply b-tagging criteria for the non forward jets Discrimination of quark/gluon jets (different fragmenation) 2. Main background : QCD production of 4 jets events Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 17 / 39
29 Search for H bb decay Vector boson fusion production 1. Analysis strategy : look at qqbb final state Dedicated 4jets triggers exploiting VBF topology (high η jj ) Select 2 forward jets with high m jj also specific to the VBF production Apply b-tagging criteria for the non forward jets Discrimination of quark/gluon jets (different fragmenation) 2. Main background : QCD production of 4 jets events Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 17 / 39
30 Search for H bb decay Signal extraction : Categories based in BDT (VBF tagging jets, b-tagging) Then look at m bb distribution. Combine categories. Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 18 / 39
31 Search for H bb decay Signal extraction : Categories based in BDT (VBF tagging jets, b-tagging) Then look at m bb distribution. Combine categories. m bb distribution and result : Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 18 / 39
32 Search for H ττ decay Overview. 1 Search for H bb decay. 2 Search for H ττ decay. 3 Search for H µµ decay. 4 Dedicated searches for tth production Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 19 / 39
33 Search for H ττ decay Search for H ττ Which production mode? All of them are exploited Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 20 / 39
34 Search for H ττ decay Search for H ττ Which production mode? All of them are exploited Experimental challenges for H ττ : Decay of τ pair into stable particles leads to 3 different final states Reconstruction of (τ, τ) invariant mass (escaping neutrinos) Energy scale determination of hadronic τ decays (and its uncertainty) References : ATLAS-CONF CMS PAS HIG , CMS PAS HIG Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 20 / 39
35 Search for H ττ decay Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 21 / 39
36 Search for H ττ decay Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 21 / 39
37 Search for H ττ decay Common strategy : Search for a bump in m ττ on top of dominant background : Z ττ Data-driven estimation of Z ττ : use Z µµ data events with µ pair replaced by simulated τ pair (non τ quantities are data). Exploit VBF via di-jet topology (high η jj, high m jj ) Exploit GGF at high (τ, τ) boost : better RMS(E/ T ) better RMS(m ττ ) Reduce and understand the fake τs (see next slide) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 22 / 39
38 Search for H ττ decay Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 23 / 39
39 Search for H ττ decay Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 23 / 39
40 Search for H ττ decay m ττ distribution Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 24 / 39
41 Search for H ττ decay Results : exclusion limit Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 25 / 39
42 Search for H ττ decay Results : compatibility with background only Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 26 / 39
43 Search for H ττ decay Some highlights : 2.85 σ excess for CMS, compatible with H ττ SM process ATLAS needs to add remaining 8 TeV data CMS bb + ττ combination leads to 3.4 σ excess fermionic decay Start to probe Higgs field properties in fermionic final state Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 27 / 39
44 Search for H ττ decay Associated production VH Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 28 / 39
45 Search for H ττ decay Associated production VH Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 28 / 39
46 Search for H ττ decay Associated production VH Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 29 / 39
47 Search for H µµ decay Overview. 1 Search for H bb decay. 2 Search for H ττ decay. 3 Search for H µµ decay. 4 Dedicated searches for tth production Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 30 / 39
48 Search for H µµ decay H µµ : motivations, challenges, strategy 1. Motivations : Directly sensitive to g Hµµ, BR H µµ : small but enhanced in some BSM scenarios, Clear signature : bump in M µµ distribution. Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 31 / 39
49 Search for H µµ decay H µµ : motivations, challenges, strategy 1. Motivations : Directly sensitive to g Hµµ, BR H µµ : small but enhanced in some BSM scenarios, Clear signature : bump in M µµ distribution. 2. Challenges : Important background : Z µµ with s/ b 0.26 (for 20 fb 1 ), Key instrumental feature : M µµ resolution. Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 31 / 39
50 Search for H µµ decay H µµ : motivations, challenges, strategy 1. Motivations : Directly sensitive to g Hµµ, BR H µµ : small but enhanced in some BSM scenarios, Clear signature : bump in M µµ distribution. 2. Challenges : Important background : Z µµ with s/ b 0.26 (for 20 fb 1 ), Key instrumental feature : M µµ resolution. 3. Strategy : Look for a bump between GeV M µµ Split events in 2 categories based on M µµ resolution, Bkg/signal modelling : analytical shapes (fit in MC), unbinned fit References : ATLAS-CONF Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 31 / 39
51 Search for H µµ decay Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 32 / 39
52 Dedicated searches for tth production Overview. 1 Search for H bb decay. 2 Search for H ττ decay. 3 Search for H µµ decay. 4 Dedicated searches for tth production Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 33 / 39
53 Dedicated searches for tth production Direct access to couplings between Higgs and top quark field : Test proportionality between mass and couplings Higgs field properties at higher mass scale - new physics might appear Constrain potential new physics appearing in loops Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 34 / 39
54 Dedicated searches for tth production Direct access to couplings between Higgs and top quark field : Test proportionality between mass and couplings Higgs field properties at higher mass scale - new physics might appear Constrain potential new physics appearing in loops Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 34 / 39
55 Dedicated searches for tth production Direct access to couplings between Higgs and top quark field : Test proportionality between mass and couplings Higgs field properties at higher mass scale - new physics might appear Constrain potential new physics appearing in loops Extremely challenging : Low production rate : 0.4% of σ tot (H). Complex final state : leptons, 4 b-jets (combinatorics), E/ T, potentially τs Large background systematics (t t + b-jets, t t + V). References : ATLAS-CONF , CMS PAS HIG Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 34 / 39
56 Dedicated searches for tth production Strategy adopted by ATLAS : Focus on H bb decay and t t semi-leptonic decay Not presented : tth( γγ) Kinematic reconstruction and b-jets pairing : global fit event-by-event Common to ATLAS & CMS : fit data in several categories to reduce systematics on t t + b-jets / t t + V backgrounds Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 35 / 39
57 Dedicated searches for tth production Strategy adopted by ATLAS : Focus on H bb decay and t t semi-leptonic decay Not presented : tth( γγ) Kinematic reconstruction and b-jets pairing : global fit event-by-event Common to ATLAS & CMS : fit data in several categories to reduce systematics on t t + b-jets / t t + V backgrounds Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 35 / 39
58 Dedicated searches for tth production Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 36 / 39
59 Dedicated searches for tth production Strategy adopted by CMS : Exploit H bb and H ττ decays. Not presented : tth( γγ). Make advantage of semi-leptonic and di-leptonic decays of t t system Combine b-tagging, τid, b-jet pairing in a BDT for bkg/sig separation Not presented : tth( γγ) and its full combination with tth( bb/ττ) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 37 / 39
60 Dedicated searches for tth production Strategy adopted by CMS : Exploit H bb and H ττ decays. Not presented : tth( γγ). Make advantage of semi-leptonic and di-leptonic decays of t t system Combine b-tagging, τid, b-jet pairing in a BDT for bkg/sig separation Not presented : tth( γγ) and its full combination with tth( bb/ττ) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 37 / 39
61 Dedicated searches for tth production Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 38 / 39
62 Conclusions.. Higgs fermonic decays are experimentally challenging : low production rate, high background, complicated final state Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 39 / 39
63 Conclusions.. Higgs fermonic decays are experimentally challenging : low production rate, high background, complicated final state Crucial searches to fully understand the sector of the new boson : Direct measurement of coupling to fermionic fields Crucial for the new boson properties measurement (talk by E. Pianori) Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 39 / 39
64 Conclusions.. Higgs fermonic decays are experimentally challenging : low production rate, high background, complicated final state Crucial searches to fully understand the sector of the new boson : Direct measurement of coupling to fermionic fields Crucial for the new boson properties measurement (talk by E. Pianori) Wide search program at LHC and first exciting results : Golden channels : VH( bb) & GGF/VBF H ττ Secondary channels : tth, VH( ττ), VBF H bb Reach SM sensitivity in the key channels (3.4 σ excess in ττ + bb at CMS), and more to come with refined analysis and/or more data Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 39 / 39
65 Conclusions.. Higgs fermonic decays are experimentally challenging : low production rate, high background, complicated final state Crucial searches to fully understand the sector of the new boson : Direct measurement of coupling to fermionic fields Crucial for the new boson properties measurement (talk by E. Pianori) Wide search program at LHC and first exciting results : Golden channels : VH( bb) & GGF/VBF H ττ Secondary channels : tth, VH( ττ), VBF H bb Reach SM sensitivity in the key channels (3.4 σ excess in ττ + bb at CMS), and more to come with refined analysis and/or more data Essential step torward new physics discovery : tth and GGF offer a unique way of probing new physics in Higgs sector Sensitivty to BR(H inv) is dominated by Γ(H bb) uncertainty Romain Madar (Freiburg University) PIC /09/13 - Beijing, China 39 / 39
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