The Compact Muon Solenoid Experiment. Conference Report. Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland

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1 Available on CMS information erver CMS -8/ he Compact Muon Solenoid Experiment Conference Report Mailing addre: CMS CERN, CH GENEVA, Switzerland 9 June 8 (v, July 8) Search and meaurement of the SM Higg boon Silvio Donato on behalf of the ALAS and CMS Collaboration Abtract After the ucce of the LHC Run phyic program, the ALAS and CMS Collaboration have preented their reult obtained with the firt fb of integrated luminoity delivered by the LHC at = ev in Run-. We preent the main reult obtained on the Standard Model Higg boon, including the earche for pecific decay and production channel, and the meaurement of the Higg boon coupling and differential cro ection. Preented at La huile 8 XXXII Le Rencontre de Phyique de la Vallee d Aote

2 IL NUOVO CIMENO Vol.?, N.?? Search and meaurement of the SM Higg boon S. Donato ( ) on behalf of the ALAS and CMS Collaboration ( ) Univerity of Zurich, Switzerland Summary. After the ucce of the LHC Run phyic program, the ALAS and CMS Collaboration have preented their reult obtained with the firt fb of integrated luminoity delivered by the LHC at = ev in Run-. We preent the main reult obtained on the Standard Model Higg boon, including the earche for pecific decay and production channel, and the meaurement of the Higg boon coupling and differential cro ection. PACS:.8.Bn Standard-model Higg boon Introduction he legacy of the LHC Run ha been a huge ucce with the dicovery of the tandard model (SM) Higg boon and the firt meaurement of it propertie and coupling. hi document ummarize the mot important SM Higg phyic reult obtained with the ALAS [] and CMS [] experiment uing the firt fb of integrated luminoity delivered by the LHC in Run- at = ev.. Obervation of H(ττ) he earch for the SM Higg boon decaying into τ lepton performed by the CMS Collaboration in Run- data [] ( ) exploit five final tate, depending on the τ lepton decay: eµ, µτ h, eτ h, τ h τ h, where τ h refer to the hadronic decay of the τ lepton. he τ h i identified uing a multivariate dicriminant, and it energy ha been calibrated uing Z τ h τ h event. he ame-flavor final tate ee and µµ have not been included becaue of the large Drell-Yan background. he main background procee are Z(τ τ), W (lν)+jet, t t, and multijet event. he multijet background i reduced requiring the lepton to be with oppoite ign and iolated. he eτ h and µτ h ubchannel are contaminated by W (lν)+jet event having a jet miidentified a τ h. In order to reduce thi background, the tranvere ma of the ytem ( )ALAS ha recently releaed a public reult on H(ττ) []. c CERN on behalf of the ALAS and CMS Collaboration Creative Common Attribution. Licene (

3 S. DONAO ON BEHALF OF HE ALAS AND CMS COLLABORAIONS CMS, VBF τ h τ h.9 fb ( ev) Event/bin < m < GeV < m < GeV < m < 8 GeV jj jj jj m jj > 8 GeV Oberved H ττ (µ =.9) Z ττ Z µµ/ee tt+jet W+jet QCD multijet Other otal unc. H ττ (µ =.9) (Ob. - bkg.) Bkg. unc (GeV) m ττ Ob. - bkg. Bkg. unc. H ττ Bkg. unc. Bkg. unc. Figure. he D fit of the VBF H τ h τ h category (CMS). he fit i performed uing the di-tau (m ττ ) v di-jet (m jj) invariant ma ditribution []. lepton + miing tranvere energy i required to be lower than GeV. Fully-leptonic t t decay event are rejected in the eµ category by requiring p ζ.8p vi ζ > or GeV, depending on the category, where p vi ζ i the miing tranvere energy component along the biector of the two lepton direction, and p ζ i the total lepton tranvere momentum along the ame direction. 7 In order to increae the enitivity, three categorie targeting different production 8 mode have been defined: -jet, vector-boon fuion (VBF), and booted. 9 Background are etimated uing both imulation and data-driven method. he Z(τ τ) background i taken from imulation after having applied correction baed on Z(µµ) data. Simulation are alo ued to etimate the t t and W (lν)+jet background, while their normalization are extracted from two control region defined by inverting, repectively, the tranvere ma and p ζ cut. he multijet background i entirely eti- mated from data inverting the lepton iolation cut and requiring a ame-ign charge. he invariant ma of the τ pair (m ττ ) i the mot powerful variable to eparate Z(ττ) from H(τ τ). However, the viible ditau invariant ma i largely overlapping between 7 the Z and Higg boon mae becaue of the preence of neutrino from the τ decay. 8 he SVFI algorithm [] ha been adopted in the attempt to meaure the whole m ττ 9 ma auming the mot-likely kinematic propertie of the neutrino in the event. he ignal i extracted uing either a D or D fit of the mot dicriminating variable. For example, Fig. how the D fit in the VBF τ h τ h channel. he fitted ignal trength i µ = σ σ SM = (tat)+.. (yt)+..8 (theo)+.. (bkg tat), with the CMS meaurement at 8 ev, the ignal trength i µ =.98 ±.8, correpond- ing to an oberved and expected ignificance of.9σ. hi i the firt obervation of H ττ obtained by a ingle experiment Evidence of tth.. tth in multilepton final tate. In the tth production channel ( ), the Higg boon i produced in aociation with a top quark pair. he Higg boon can decay into ( )he tth production ha been oberved by CMS uing data [] and later by ALAS including alo 7 data [7].

4 SEARCH AND MEASUREMEN OF HE SM HIGGS BOSON Number of τhad l+τhad Event / bin ALAS = ev,. fb Pot Fit ttw Diboon q mi id Fake τ had Pre Fit Bkgd. tth ttz Non prompt Other Uncertainty lss+τhad los+τhad l+τhad l lss l Number of light lepton / Pred lss ltt Z ltt W l ltt lvv lss+τ had l+τ had l+τ had l Z dep. l Z enr. los+τ had Figure. On the left, the category definition adopted in the ALAS and CMS tth multilepton analye (l + τ h i included only in the ALAS analyi) and, on the right, the data yield of each category compared with the expectation in the ALAS analyi [8] lepton through the decay H W W, ZZ, ττ and up to two additional lepton can be originated from the decay of the top quark. he final tate with at leat two ameign lepton i very peculiar and convenient to reject the overwhelming Z/W+jet and t t background. Fig. how all final tate explored by ALAS and CMS analye [8, 9]. he main background with at leat two real ame-ign lepton are the top-quark pair produced in aociation with a vector boon Z/W (ttv ) and the di-boon production (V V ). he other remaining background are event where the recontructed charge of a lepton i wrong (charge flip), a jet i identified a a τ h (fake τ h ), or a lepton originated from a hadron decay i recontructed a a ignal lepton (non-prompt). Background containing at leat two real ame-ign lepton are etimated uing imulation (eg. ttv and V V ) while all other background are etimated uing data-driven technique. Several variable are combined in a multivariate dicriminator in the attempt to increae the eparation between ignal and background. he ignal trength i meaured fitting imultaneouly in each category the ditribution of thi multivariate dicriminator. he reult are hown in able I. able I. Reult obtained in the earch for tth in multilepton final tate by ALAS and CMS collaboration with data. Final tate Signal trength Sign.(exp.) ALAS incluive µ =. +.. (tat)+.. (yt).σ(.8σ) CMS N(τ h ) = µ =. +.. (tat)+.. (yt).σ(.σ) N(τ h ) > µ = σ(.8σ) Search for tth(bb). In the tth(bb), four b-jet are produced from the Higg boon and top-quark pair decay. he ALAS Collaboration ha earched for the tth(bb) in the final tate with one or two iolated lepton, at leat four jet and two of them are b-tagged [] ( ). he main background paing thi election i t t + jet. Event have been categorized depending on the number of jet and lepton and on ( )CMS ha recently ubmitted two paper about the earch for tth(bb) in all-hadronic [] and leptonic [] final tate.

5 S. DONAO ON BEHALF OF HE ALAS AND CMS COLLABORAIONS Event / bin 8 ALAS 7 = ev,. fb Single Lepton Pot-Fit tt + c t th tt + light t t + b tt + V Non-tt otal unc. tth Event / bin 7 ALAS = ev,. fb Dilepton Pot-Fit tt + c t th tt + light t t + b tt + V Non-tt otal unc. tth / Pred j tt+light j tt+c j tt+b j j booted j tt+light tt+ j c j tt+b j j j / Pred j tt+light j tt+b j tt+light tt+ j c j j j Figure. Analyi categorie of the earch for tth(bb) performed by the ALAS Collaboration in the emi-leptonic (left) and fully-leptonic (right) top-quark decay [] the b-tagging dicriminator value of jet, forming 9 ignal region with different puritie and control region, ueful to contrain the normalization of the background. he analyi categorie definition together with their ignal and background compoition are hown in Fig.. he ignal i extracted fitting imultaneouly in all ignal and control region a multivariate dicriminator to increae the ignal/background eparation. he reult obtained by the ALAS Collaboration in the earch for H bb, together with the other tth earche and their combination, are hown in ab. II. hi i the firt evidence for tth production obtained by a ingle experiment. able II. Reult of all Run- tth earche performed by the ALAS Collaboration and their combination [8]. Channel Ob. bet-fit µ Exp. bet-fit µ Ob. ignificance Exp. ignificance Multilepton σ.8σ H bb σ.σ H γγ σ.7σ H l < σ Combined σ.8σ Evidence of V H(bb) he mot enitive channel to earch for the H bb i the aociated production of the Higg boon with a vector boon decaying into lepton (V H). he leptonic decay of the vector boon i ueful to reject the large multijet production from trong interaction. he analye performed by the ALAS and CMS collaboration are decribed, repectively, in Ref. [] and []. he mot dicriminating variable between ignal and background are the di-jet invariant ma and the b-tagging value of jet. In order to improve the di-jet invariant ma reolution, a pecial calibration for b jet i adopted. hi calibration i obtained exploiting everal variable, including thoe related to the poible preence of a oft lepton originated from the B hadron decay. A way to further improve the di-jet invariant ma reolution i the kinematic fit, where Z(ll)H(bb) candidate event are contrained to have no miing tranvere energy. he analyi i ubdivided into categorie depending

6 SEARCH AND MEASUREMEN OF HE SM HIGGS BOSON Event / GeV (Weighted, backgr. ub.) ALAS = ev,. fb VH Vbb (µ=.) Diboon ++ lepton Uncertainty + jet, b-tag 8 Weighted by S/B Dijet ma analyi 8 8 [GeV] m bb Entrie / MC (B) CMS. VZ(bb) Background.9 fb ( ev) VZ(bb) Bkg. unc log (S/B) Figure. Dijet ma ditribution after the ubtraction of all expected background (ALAS, left) and combination of all ignal region plot merging bin having the ame purity (CMS, right) []. 9 on the number of lepton, jet, b-tagged jet, and on the momentum of the vector boon 9 candidate. he main background are Z/W + jet and t t. Background are etimated 9 uing imulation, but their normalization are free parameter of the fit. In order to 9 contrain the background normalization, dedicated control region enriched with each 9 of the background are included in the fit. he final fit i performed by fitting imulta- 9 neouly all ignal and control region. he ditribution of a multivariate dicriminant i 97 fitted in ignal region in order to increae the eparation between ignal and background. 98 A an analyi cro-check, the V Z(bb) proce ha been meaured uing a imilar 99 analyi trategy. he meaurement obtained by ALAS i µ Z(bb) =. ±. and by CMS i. ±., both of which are compatible with SM prediction. he reult for the V H(bb) earche i µ =.9 ±.8(tat) +..9 (yt) by ALAS, correponding to an CMS i µ =..9 +., correponding to an exce of.8σ (.8σ expected). Figure how except V V and the combination of all ignal region hitogram merging bin having the ame purity. 7. Other Higg boon earche. 8. Search for V H(cc). he V H(cc) earch i imilar to V H(bb) but it look for the 9 decay of the Higg boon into charm quark. It ha been performed by ALAS in data [] in the two lepton final tate and exploiting a charm-jet tagger recently developed []. hi tagger ha been calibrated uing W c/cd decay data. he challenge of thi channel are the mall branching fraction H cc (.9%), the difficulty to tag charm jet, the large Z(ll) + c-jet background, the H bb background peaking at the ame ma of the ignal H cc. A validation analyi ha been performed looking for ZW (c) and ZZ(cc). he reult i µ V V =. +.., correponding to a ignificance of.σ (.σ expected). he reult for the earch for V H(cc) i µ = 9 ± with a 9% 7 confidence level (CL ) upper limit of µ < ( µ < expected) Search for booted H(bb). An incluive earch for booted H bb with p > GeV ha been performed by the CMS Collaboration [7]. hi analyi recontruct the Higg boon a a wide jet with R =.8 and exploit ubtructure technique to recontruct the two ubjet, to reduce the pile-up effect, and to improve the ma reolution. A pecific double b-tagger ha been developed for thi analyi to identify wide

7 S. DONAO ON BEHALF OF HE ALAS AND CMS COLLABORAIONS Event / 7 GeV CMS < p < GeV double-b tagger failing region.9 fb ( ev) W Z tt Multijet otal background H(bb) Event / 7 GeV 8 7 CMS < p < GeV double-b tagger paing region.9 fb ( ev) W Z tt Multijet otal background H(bb) multijet tt σ 8 8 m (GeV) SD multijet tt σ 8 8 m (GeV) SD Figure. Wide-jet ma ditribution for the antitag (left) and double b tag (right) region in the earch for booted H(bb) with the CMS experiment [7] jet containing two B hadron like H bb [8]. he main background are multijet, Z+jet, and W+jet event. he multijet background ha been etimated inverting b tagging and applying a tranfer function obtained from ideband, a hown in Fig., where the W/Z peak i clearly viible. he bet-fit ignal trength i µ =. ±.(tat) +.. (yt), correponding to a ignificance of.σ (.7σ expected)... Search for H(Zγ). he H Zγ i a further Higg boon decay that will be acceible at the LHC. In the analyi performed by ALAS [9] ( ), the Zγ peak i earched over a moothly falling background in the invariant ma pectrum. he Z boon i recontructed in the dimuon and dielectron decay. he analyi i divided in different categorie targeting different production channel. In particular, the vector boon fuion category ha the larget enitivity. he final reult i a 9% CL upper limit on the cro ection of. time the SM Higg boon prediction (. expected)... Search for H(µµ). he branching fraction of the SM Higg boon decay into muon i very mall ( ). hi channel i the mot enitive way to probe the Higg 7 boon coupling with econd-generation particle. Depite the mall branching fraction, 8 ALAS and CMS aim to oberve thi proce in the next year exploiting the large 9 integrated luminoity expected to be delivered by the LHC. he Run- ALAS and CMS analye [, ] reached large improvement in enitivity compared to thoe from Run. he earche have been performed looking for the peak in the dimuon invariant ma ditribution over a falling moothly background. he enitivity ha been enhanced plitting the phae pace in categorie with different puritie, uing a multivariate di- criminant. Figure how the ditribution of uch multivariate dicriminant ditribution and the dimuon ma pectrum obtained after having combined all categorie reweighted according to their purity. he reult are µ = , correponding to an oberved 7 (expected) ignificance of.98σ (.9σ), for CMS and µ =. ±. for ALAS Search for H(light quark). he earch of the Higg boon decaying to light quark ha been performed by ALAS collaboration looking for the H φγ and H ρ(77)γ decay []. he final tate conidered require two iolated track with p > GeV with an invariant ma compatible with ρ or φ and one photon with p > GeV. he background i etimated uing a data-driven technique, and it ha been validated exploiting ρ and φ ideband. he 9% CL upper limit on the branching ratio found are ( )he recent CMS reult are in Ref. [].

8 e Breit Wigner:B(x) = ax z (x µ z ) +( z ) e Modified Breit Wigner (mbw):b(x) = a x+a x (x µ z ) a +( z ) a In ome categorie, a variation on the modified Breit Wigner ditribution (Eq. ) i ue tiplying it by a Berntein polynomial of up to degree. Due to difference in muon ma reolution and background compoition, we elect th ground functional form eparately for each category. Figure how the dimuon ma trum for the two mot enitive categorie, category (right) and (left). he choic SEARCH AND MEASUREMEN OF HE SM HIGGS background BOSON function i baed on minimizing the poible 7 bia in the fitted ignal yield i= Event Event.9 fb CMS Preliminary CMS Preliminary ggh DY qqh tt+t ZH VV W - H X W + H VVV tth ( ev) S/(S+B) Weighted Event /. / GeV CMSPreliminary H µµ m H =. GeV, µ=.7 µ=.7 ^ =.7 for for mmh= H GeV 8 All categorie cat S/(S+B) weighted S+B fit B component ± σ ± σ B component ubtracted.9 fb fb(( ev) ev) S+B fit B component ± σ ± σ Event /. GeV CMS Preliminary.9 fb H µµ µ=.7 for m cat H = GeV S+B fit B compon ± σ ± σ tranformed BD m µµ [GeV] B component ubtracted Figure. Multivariate dicriminant ditribution defining H µµ categorie (left) m µµ [GeV] and dimuon ma ditribution (right) obtained by the CMS Collaboration []. B component ubtracted m Figure : Signal-plu-background (S+B) fit (olid) and the background-only (B) com (dahed) of the dimuon ma pectrum in event from category (left) with the Modifie Wigner multiplied by a Berntein polynomial (degree ) a the functional form and c (right) with the Modified Breit-Wigner functional form. he lower plot how the.8 (. expected) for H(φγ) and 8.8 (8. expected) for H(ργ). ma pectrum with the fitted background component ubtracted (B component ubtra hee limit correpond to µ < 8 (8 expected) for H(φγ) and µ < ( expected) for H(ργ). 7 o etimate the poible bia, all of the function in Eq., and ome additional fu 8 combination and FEWZ pectra template, are ued to fit the data in each category 9 each of thee fit, peudo-experiment are randomly generated to create thouand of p. Preciion Higg boon meaurement dataet, taking into account the uncertainty on the fit parameter. Each of the func.. Differential cro ection. he then Higg ued boon to fit decay the peudo-dataet to photon (H generated γγ) from and the to other function, with the m four lepton (H l) are the mot enitive channel to provide preciion meaurement of the Higg boon. he Run- meaurement of the Higg boon cro ection obtained by ALAS and CMS a a function of the centre-of-ma energy are hown if Fig. 7 [,, ]( ). he growing ignal allow to meaure the differential cro ection a a function of variable like the Higg boon p and η. Fig. 8 how the fiducial H γγ cro ection a a function of the Higg boon p. he -ev H l and H γγ analye have been alo ued to the meaure Higg boon coupling with fundamental particle, including the effective loop-induced coupling with gluon and photon. All reult obtained o far are compatible with the SM expectation. Fig. 9 how the D meaurement of the coupling modifier for fermion (κ f ) and vector boon (κ V ). he enitivitie of thee analye are already cloe to that of the Run ALAS+CMS (fb) σ fid. fb (7 ev), 9.7 fb (8 ev),.9 fb ( ev) CMS (tat. y. unc.) Sytematic uncertainty Standard model LHC HXSWG YR, m =.9 GeV H pp (H l) + X (ev) (fb) σ fid CMS Supplementary H γγ (bet-fit m H ) yt. uncertainty SM (m H =.9 GeV) - norm. LHC Higg XSWG YR - acc. AMC@NLO 9.7 fb (8 ev) +.9 fb ( ev) (ev) [pb] σ pp H 8 ALAS Preliminary σ pp H m H =.9 GeV H γ γ H ZZ * l combined data ytematic uncertainty QCD cale uncertainty otal uncertainty (cale PDF+α ) = 7 ev,. fb = 8 ev,. fb = ev,. fb [ev] Figure 7. Higg boon cro ection a a function of the centre-of-ma energy for H l (left) and H γγ (center) channel meaured by CMS, and both channel with their combination meaured by ALAS (right) [,, ]. ( )A recent combination of the Run- CMS Higg boon analye with the meaurement of coupling and ignal trength i available in Ref.[8]

9 γ γ γ γ 8 S. DONAO ON BEHALF OF HE ALAS AND CMS COLLABORAIONS (fb/gev) γγ dσ fid /dp CMS Preliminary.9 fb (ev) H γ γ LHC HXSWG YR, m =.9 GeV H ggh amc@nlo + HX ggh POWHEG + HX HX amc@nlo ) dp σ (p fid [fb/gev] γγ / dp dσ fid ALAS, γ H γ, tot. unc. gg H HRe. + XH XH = ev,. fb Syt. unc. default MC + XH RadISH+NNLOJE + XH = VBF+VH+ttH+bbH Ratio to amc@nlo + HX p [GeV]... γ γ p (GeV) Ratio to default MC + XH γγ p [GeV] Figure 8. Higg boon cro ection a a function of the Higg boon p H γγ channel by CMS (left) [7] and ALAS (right) []. a meaured in the 7 combination paper [9]. κ f CMS m H profiled. Bet Fit 8% CL 9% CL. SM.9 fb ( ev) 8 q(κ V,κ f ) κ f.. SM prediction Bet fit Combined 8% CL Combined 9% CL H γγ 8% CL H ZZ* l 8% CL ALAS Preliminary = ev,. fb γ H γ m H and H ZZ* l =.9 GeV κ V κ V Figure 9. Higg boon coupling modifier of fermion (κ f ) and vector boon (κ V ) a meauered by ALAS (left) and CMS (right). he ALAS plot i obtained uing both H l and H γγ data, while the CMS reult include only H γγ [9, ] Concluion he ALAS and CMS collaboration publihed many important Higg reult in the lat year, including the ingle-experiment obervation of H ττ, the evidence for H bb and tth production, brand new Higg boon earche (e.g. booted H bb, H cc), and a large improvement on the earch for H µµ. he H l and H γγ channel are ued to meaure differential cro ection and coupling. All reult hown have been obtained uing the firt fb collected in LHC Run-. In 7, the LHC doubled the integrated luminoity, and even more data are expected to be collected in 8. Many more reult are expected to be publihed in the next month REFERENCES [] G. Aad et al. [ALAS Collaboration], JINS (8) S8. doi:.88/78- //8/S8 [] S. Chatrchyan et al. [CMS Collaboration], JINS (8) S8. doi:.88/78- //8/S8 [] A. M. Sirunyan et al. [CMS Collaboration], Phy. Lett. B 779 (8) 8 doi:./j.phyletb.8.. [arxiv:78.7 [hep-ex]]. [] ALAS collaboration, ALAS-CONF-8-.

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