Combined QCD and electroweak analysis of HERA data

ZEUS Collaboration: H. Abramowicz; I. Abt; L. Adamczyk; M. Adamus; S.; Antonelli; V. Aushev; O. Behnke; U. Behrens; A. Bertolin; S. Bhadra; I.; Bloch; E.G. Boos; I. Brock; N.H. Brook; R. Brugnera; A. Bruni; P.J. Bussey,; A. Caldwell; M. Capua; C.D. Catterall; J. Chwastowski; J. Ciborowski; R.; Ciesielski; A.M. Cooper-Sarkar; M. Corradi; R.K. Dementiev; R.C.E. Devenish,; S. Dusini; B. Foster; G. Gach; E. Gallo; A. Garfagnini; A. Geiser; A. Gizhko,; L.K. Gladilin; Yu.A. Golubkov; G. Grzelak; M. Guzik; C. Gwenlan; W. Hain; O.; Hlushchenko; D. Hochman; R. Hori; Z.A. Ibrahim; Y. Iga; M. Ishitsuka; F.; Januschek; N.Z. Jomhari; I. Kadenko; S. Kananov; U. Karshon; P. Kaur; D.; Kisielewska; R. Klanner; U. Klein; I.A. Korzhavina; A. Kotanski; U. Koetz; N.; Kovalchuk; H. Kowalski; B. Krupa; O. Kuprash; M. Kuze; B.B. Levchenko; A.; Levy; S. Limentani; M. Lisovyi; E. Lobodzinska; B. Loehr; E. Lohrmann; A.; Longhin; D. Lontkovskyi; O.Yu. Lukina; I. Makarenko; J. Malka; A.; Mastroberardino; F. Mohamad Idris; N. Mohammad Nasir; V. Myronenko; K.; Nagano; T. Nobe; R.J. Nowak; Yu. Onishchuk; E. Paul; W. Perlanski; N.S.; Pokrovskiy; A. Polini; M. Przybycien; P. Roloff; M. Ruspa; D.H. Saxon; M.; Schioppa; U. Schneekloth; T. Schoerner-Sadenius; L.M. Shcheglova; R.; Shevchenko; O. Shkola; Yu. Shyrma; I. Singh; I.O. Skillicorn; W. Slominski,; A. Solano; L. Stanco; N. Stefaniuk; A. Stern; P. Stopa; J. Sztuk-Dambietz; E.; Tassi; K. Tokushuku; J. Tomaszewska; T. Tsurugai; M. Turcato; O. Turkot; T.; Tymieniecka; A. Verbytskyi; W.A.T. Wan Abdullah; K. Wichmann; M. Wing; S.; Yamada; Y. Yamazaki; N. Zakharchuk; A.F. Zarnecki; L. Zawiejski; O. Zenaiev,; B.O. Zhautykov; D.S. Zotkin

arXiv:1603.09628·hep-ex·May 16, 2016·5 cites

Combined QCD and electroweak analysis of HERA data

ZEUS Collaboration: H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, S., Antonelli, V. Aushev, O. Behnke, U. Behrens, A. Bertolin, S. Bhadra, I., Bloch, E.G. Boos, I. Brock, N.H. Brook, R. Brugnera, A. Bruni, P.J. Bussey,, A. Caldwell, M. Capua, C.D. Catterall, J. Chwastowski

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TL;DR

This paper performs a combined analysis of QCD and electroweak data from HERA to extract fundamental parameters, confirming their consistency with Standard Model predictions.

Contribution

It introduces a simultaneous fit of PDFs and electroweak parameters using HERA data, including electron beam polarization effects, providing new constraints on electroweak couplings.

Findings

01

Electroweak parameters agree with Standard Model

02

Precise measurements of Z couplings to quarks

03

Updated W boson mass estimate

Abstract

A simultaneous fit of parton distribution functions (PDFs) and electroweak parameters to HERA data on deep inelastic scattering is presented. The input data are the neutral current and charged current inclusive cross sections which were previously used in the QCD analysis leading to the HERAPDF2.0 PDFs. In addition, the polarisation of the electron beam was taken into account for the ZEUS data recorded between 2004 and 2007. Results on the vector and axial-vector couplings of the Z boson to u- and d-type quarks, on the value of the electroweak mixing angle and the mass of the W boson are presented. The values obtained for the electroweak parameters are in agreement with Standard Model predictions.

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Taxonomy

TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research