Search for the flavor-changing neutral current interactions of the top quark and the Higgs boson which decays into a pair of b quarks at sqrt{s}=13 TeV

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Lisniak,S Liu,S Lowette,S M A Ghiasi Shirazi,S M Etesami,S M Heindl,S M Shaheen,S M Tan,S Malhotra,S Malik,S Mallios,S Malvezzi,S Marcellini,S Maselli,S Meola,S Mersi,S Mitra,S Moortgat,S Mrenna,S Mukherjee,S Muthumuni,S My,S Nahn,S Nandan,S Narayanan,S Norberg,S Nourbakhsh,S Nuzzo,S Obraztsov,S Oliveros,S Orfanelli,S P Ratti,S Padhi,S Paktinat Mehdiabadi,S Pandey,S Paoletti,S Paramesvaran,S Pigazzini,S Piperov,S Polikarpov,S R Wagner,S Ragazzi,S Rahatlou,S Rappoccio,S Regnard,S Roy Chowdhury,S S Chhibra,S S Yu,S Sagir,S Salur,S Salva,S Sanders,S Sarkar,S Schnetzer,S Schumann,S Sekmen,S Shalhout,S Sharma,S Shmatov,S Shulha,S Simon,S Somalwar,S Spanier,S Stoynev,S Summers,S Taroni,S Tavernier,S Tekten,S Thakur,S Thomas,S Thüer,S Tosi,S Troshin,S Tuo,S Turkcapar,S Undleeb,S V Gleyzer,S V Rusakov,S Vavilov,S Viret,S W Lee,S Wang,S Wasserbaech,S Wayand,S Wertz,S Williamson,S Wimpenny,S Xie,S Zahid,S Zaleski,S Zhang,T A Gómez Espinosa,T Adams,T Arndt,T Aushev,T Aziz,T Bergauer,T Boccali,T 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Karjavin,V Khristenko,V Kim,V Klyukhin,V Knünz,V Krutelyov,V Kumar,V M Ghete,V Mariani,V Matveev,V Mossolov,V Murzin,V Oreshkin,V O’Dell,V Palichik,V Palladino,V Perelygin,V Petrov,V Popov,V R Tavolaro,V Re,V Savrin,V Sharma,V Smirnov,V Sola,V Sordini,V Stolin,V Valuev,V Veckalns,W A Khan,W Adam,W Bertl,W Busza,W Carvalho,W Clarida,W D Zeuner,W De Boer,W Erdmann,W Fang,W Funk,W H Smith,W J Spalding,W J Womersley,W Ji,W Johns,W Ko,W L Aldá Júnior,W Lange,W Li,W Lin,W Lohmann,W Luo,W Lustermann,W Mcbrayer,W Shi,W Si,W T Ford,W Verbeke,W Waltenberger,W Wu,W Xie,W.-S Hou,X Chen,X Coubez,X Gao,X Janssen,X Niu,Y Ban,Y Chen,Y Cheng,Y Choi,Y D Oh,Y F Liu,Y Feng,Y Gershtein,Y Go,Y H Chang,Y H Shin,Y Haddad,Y Hsiung,Y Iiyama,Y Ivanov,Y Jo,Y Kim,Y Komurcu,Y Kubota,Y Mao,Y Maravin,Y Mohammed,Y Musienko,Y Onel,Y Pakhotin,Y R Joshi,Y Roh,Y Sirois,Y Skovpen,Y T Duh,Y Takahashi,Y Wang,Y Wen,Y Yilmaz,Y.-J Lee,Z Chen,Z Demiragli,Z Gecse,Z Hu,Z L Trocsanyi,Z Lesko,Z Liu,Z Mao,Z S Demiroglu,Z Tao,Z Tsamalaidze,Z Tu,Z Wang,Z Wu,Z Xu,Z Zhang,Z Zolkapli,É Chapon ,Á Hunyadi,Ž Antunović ,А Калинин ,А Спиридонов ,В Жуков ,В Качанов ,В Сулимов ,Д Педрини ,Н Голубев ,Р Тенчини

doi:10.1007/jhep06(2018)102

Abstract

A search for flavor-changing neutral currents (FCNC) in events with the top quark and the Higgs boson is presented. The Higgs boson decay to a pair of b quarks is considered. The data sample corresponds to an integrated luminosity of 35.9 fb−1 recorded by the CMS experiment at the LHC in proton-proton collisions at sqrt{s}=13 TeV. Two channels are considered: single top quark FCNC production in association with the Higgs boson (pp → tH), and top quark pair production with FCNC decay of the top quark (t → qH). Final states with one isolated lepton and at least three reconstructed jets, among which at least two are associated with b quarks, are studied. No significant deviation is observed from the predicted background. Observed (expected) upper limits at 95% confidence level are set on the branching fractions of top quark decays, ℬ(t → uH) < 0.47% (0.34%) and ℬ(t → cH) < 0.47% (0.44%), assuming a single nonzero FCNC coupling.

Highlights

√ by the CMS experiment at the LHC in proton-proton collisions at s = 13 TeV
Observed upper limits at 95% confidence level are set on the branching fractions of top quark decays, B(t → uH) < 0.47% (0.34%) and B(t → cH) < 0.47% (0.44%), assuming a single nonzero flavor-changing neutral currents (FCNC) coupling
A 95% confidence level (CL) upper limit is computed for the production cross section of tH FCNC events times branching fractions of top quark semileptonic decay and Higgs boson decay to b quarks that uses the asymptotic approximation of the CLs method [51, 52]

Summary

The CMS detector

The central feature of the CMS detector is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. Within the solenoid volume are a silicon pixel and strip tracker, a lead tungstate crystal electromagnetic calorimeter (ECAL), and a brass and scintillator hadron calorimeter (HCAL), each composed of a barrel and two. Forward calorimeters extend the pseudorapidity coverage provided by the barrel and endcap detectors. Muons are measured in gas-ionization detectors embedded in the steel flux-return yoke outside the solenoid. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in ref. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in ref. [15]

Monte Carlo simulation

Event selection

Event reconstruction and multivariate analysis

Estimation of systematic uncertainties

Results

Summary