Abstract
Wboson mass measurement is sensitive to QED radiative corrections due to virtual photon loops and real photon emission. The largest shift in the measured mass, which depends on the transverse momentum spectrum of the charged lepton from the boson decay, is caused by the emission of real photons from the final-state lepton. There are a number of calculations and codes available to model the final-state photon emission. We perform a detailed study, comparing the results fromhoraceandphotosimplementations of the final-state multiphoton emission in the context of a direct measurement ofWboson mass at Tevatron. Mass fits are performed using a simulation of the CDF II detector.
Highlights
The measurement of W boson mass is one of the most interesting precision electroweak observables
The comparison between the theoretical prediction and the measurement provides a stringent test of the SM and constrains beyond-standard model (BSM) theories
The Born mode generates these purely 2 → 1 → 2 parton processes with no radiative photons. These events are compared with events from old horace run in the QED multiphoton emission final-state radiation (FSR) mode
Summary
The measurement of W boson mass (mW) is one of the most interesting precision electroweak observables. In order to increase the precision of the QED radiative correction for W boson mass measurement, higher-order calculations were used, as implemented in horace [10,11,12,13,14] and photos [15, 16] programs. We generate W and Z boson events for Tevatron pp collisions at √s = 1.96 TeV, including higher-order QCD matrix elements and QCD resummation effects, but without loops or emission of electroweak bosons We interface these events to photos such that the events from the chain contain the QED-. In this paper we present comparisons between the distributions and the mass-fitting results obtained from the old horace and photos programs
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