Determination of electroweak parameters in polarised deep-inelastic scattering at HERA

V. Andreev , A. Baghdasaryan , K. Begzsuren , A. Belousov , A. Bolz , V. Boudry (1) , G. Brandt , V. Brisson (2) , D. Britzger , A. Buniatyan , A. Bylinkin , L. Bystritskaya , A.J. Campbell , K.B. Cantun Avila , K. Cerny , V. Chekelian , J.G. Contreras , J. Cvach , J.B. Dainton , K. Daum , C. Diaconu (3) , M. Dobre , G. Eckerlin , S. Egli , E. Elsen , L. Favart , A. Fedotov , J. Feltesse (4) , M. Fleischer , A. Fomenko , J. Gayler , L. Goerlich , N. Gogitidze , M. Gouzevitch (5) , C. Grab , A. Grebenyuk , T. Greenshaw , G. Grindhammer , D. Haidt , R.C.W. Henderson , J. Hladkỳ , D. Hoffmann (3) , R. Horisberger , T. Hreus , F. Huber , M. Jacquet (2) , X. Janssen , A.W. Jung , H. Jung , M. Kapichine , J. Katzy , C. Kiesling , M. Klein , C. Kleinwort , R. Kogler , P. Kostka , J. Kretzschmar , D. Krücker , K. Krüger , M.P.J. Landon , W. Lange , P. Laycock , A. Lebedev , S. Levonian , K. Lipka , B. List , J. List , B. Lobodzinski , E. Malinovski , H.-U. Martyn , S.J. Maxfield , A. Mehta , A.B. Meyer , H. Meyer , J. Meyer , S. Mikocki , A. Morozov , K. Müller , Th. Naumann , P.R. Newman , C. Niebuhr , G. Nowak , J.E. Olsson , D. Ozerov , C. Pascaud (2) , G.D. Patel , E. Perez , A. Petrukhin (5) , I. Picuric , D. Pitzl , R. Polifka , V. Radescu , N. Raicevic , T. Ravdandorj , P. Reimer , E. Rizvi , P. Robmann , R. Roosen , A. Rostovtsev , M. Rotaru , D. Šálek , D.P.C. Sankey , M. Sauter , E. Sauvan (3, 6) , S. Schmitt , L. Schoeffel (4) , A. Schöning , F. Sefkow , S. Shushkevich , Y. Soloviev , P. Sopicki , D. South , V. Spaskov , A. Specka (1) , H. Spiesberger , M. Steder , B. Stella , U. Straumann , T. Sykora , P.D. Thompson , D. Traynor , P. Truöl , I. Tsakov , B. Tseepeldorj , A. Valkárová , C. Vallée (3) , P. van Mechelen , Y. Vazdik , D. Wegener , E. Wünsch , J. Žáček , Z. Zhang (2) , R. Žlebčík , H. Zohrabyan , F. Zomer (2)

1 LLR - Laboratoire Leprince-Ringuet
2 LAL - Laboratoire de l'Accélérateur Linéaire
3 CPPM - Centre de Physique des Particules de Marseille
4 DPhP - Département de Physique des Particules (ex SPP)
5 IPNL - Institut de Physique Nucléaire de Lyon
6 LAPP - Laboratoire d'Annecy de Physique des Particules

The parameters of the electroweak theory are determined in a combined electroweak and QCD analysis using all deep-inelastic $e^+p$ and $e^-p$ neutral current and charged current scattering cross sections published by the H1 Collaboration, including data with longitudinally polarised lepton beams. Various fits to Standard Model parameters in the on-shell scheme are performed. The mass of the W boson is determined as $m_W=80.520\pm 0.115~\mathrm {GeV} $ . The axial-vector and vector couplings of the light quarks to the Z boson are also determined. Both results improve the precision of previous H1 determinations based on HERA-I data by about a factor of two. Possible scale dependence of the weak coupling parameters in both neutral and charged current interactions beyond the Standard Model is also studied. All results are found to be consistent with the Standard Model expectations.

Mots clés: S044M; positron p: deep inelastic scattering; electron p: deep inelastic scattering; coupling: vector; lepton: polarized beam; polarization: longitudinal; electroweak interaction; W: mass: measured; charged current; quantum chromodynamics; scale dependence; neutral current; DESY HERA Stor; H1; weak coupling; coupling: axial-vector; new physics; experimental results; S043M; S044GDA; S044GDV; S044GUA; S044GUV

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Physique des Hautes Energies - Phénoménologie [hep-ph]

V. Andreev, A. Baghdasaryan, K. Begzsuren, A. Belousov, A. Bolz, et al.. Determination of electroweak parameters in polarised deep-inelastic scattering at HERA. Eur.Phys.J.C, 2018, 78 (9), pp.777. ⟨10.1140/epjc/s10052-018-6236-8⟩. ⟨hal-01846597⟩