Single-W production to test triple gauge boson couplings at LEP

Abstract

We present a study of single-W production (e + e − → e −ν e W + ) as a new probe of the anomalous couplings at the LEP energy region. We introduce simple cuts to separate the single-W process from Wpair production and have performed cross-section calculations using 4-fermion generator "grc4f". The cross-section of the single-W process is found to be large enough to detect at LEP experiments in the near future. In addition, a high sensitivity to the anomalous coupling of the W W γ vertex is expected since the amplitude of the W W γ diagram makes a dominant contribution in this process. We have found that the cross-section measurement of the single-W process in the LEP2 energy region can give complementary bounds on the anomalous couplings to those obtained from W-pair analysis.

Single vector boson production in e+e− collisions at centre-of-mass energies from 183 to 209 GeV

“…A direct measurement of these processes is therefore an important cross-check of Standard Model predictions. The single-W process is also of interest because it probes the triple gauge WWγ coupling [2] with a sensitivity complementary to that of WW production.…”

Higher-order QED corrections to single-W production in electron–positron collisions

“…The first full four-fermion calculation, including the crucial effect of fermion masses, has been presented in ref. [7], where the lep2 sensitivity to anomalous gauge couplings has been studied. Since then, other complete four-fermion calculations of the single-W process have appeared in the literature and implemented in computational tools for data analysis [7][8][9][10][11].…”

“…[7], where the lep2 sensitivity to anomalous gauge couplings has been studied. Since then, other complete four-fermion calculations of the single-W process have appeared in the literature and implemented in computational tools for data analysis [7][8][9][10][11]. In most of these calculations the effect of fermion masses is exactly accounted for in the dynamics and kinematics for the whole four-fermion phase-space [7,8,10,11], while in the approach of ref.…”

QED radiative correction for the single-W production using a parton shower method

“…Single-W production processes present an opportunity to study the anomalous triple gauge-couplings(TGC) [1] in the experiments at LEP2 and at future e + e − linear colliders. For their precise predictions of cross sections the inclusion of an initial state radiative correction(ISR) is inevitable in the event-generator.…”