Eur. Phys. J. C (2007) 51: 607-617
https://doi.org/10.1140/epjc/s10052-007-0321-8

Regular Article - Theoretical Physics

Z boson as “the standard candle” for high-precision W boson physics at LHC

¹ LPNHE, Pierre and Marie Curie Universités Paris VI et Paris VII, Tour 33, RdC, 4, pl. Jussieu, 75005, Paris, France
² Marian Smoluchowski Institute of Physics, Jagiellonian University, ul. Reymonta 4, 30-059, Cracow, Poland
³ Theory Division, CERN, 1211, Geneva 23, Switzerland

^* e-mail: krasny@lpnhe.in2p3.fr

Received: 9 March 2007
Published online: 12 June 2007

Abstract

In this paper we propose a strategy for measuring the inclusive W boson production processes at LHC. This strategy exploits simultaneously the unique flexibility of the LHC collider in running variable beam particle species at variable beam energies, and the configuration flexibility of the LHC detectors. We propose their concrete settings for a precision measurement of the standard model parameters. These dedicated settings optimise the use of the Z boson and Drell–Yan-pair production processes as “the standard reference candles”. The presented strategy allows one to factorise and to directly measure those of the QCD effects that affect differently the W and Z production processes. It reduces to a level of the impact of uncertainties in the partonic distribution functions (PDFs) and in the transverse momentum of the quarks on the measurement precision. Last but not the least, it reduces by a factor of 10 the impact of systematic measurement errors, such as the energy scale and the measurement resolution, on the W boson production observables.