Charge asymmetry phenomenon for the leptonically decaying W γ pair at NNLO QCD
Küçük Resim Yok
Tarih
2025
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Tubitak Scientific & Technological Research Council Turkey
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The paper presents for the first time a phenomenological assessment which focuses on the charge asymmetry phenomenon for the W gamma production process with subsequent leptonic decay modes W+gamma-+ l+nu l gamma and W-gamma-+ l-nul gamma in proton-proton ( pp) collisions. Charge asymmetry for the leptonic W gamma process is predicted by the inclusion of genuine next-to-next-to-leading order (NNLO) corrections in the QCD perturbation theory. NNLO predictions of asymmetry distributions are assessed for the key observables, including the decay lepton and photon pseudorapidities eta l and eta gamma , respectively, and the lepton-photon pseudorapidity correlation triangle eta(l, gamma). The predictions are presented by focusing on realistic fiducial phase-space definitions in comparison at various pp-collision energies of 13 TeV, 14 TeV, and 100 TeV. The sensitivity of the predicted asymmetry distributions to an important observation known as radiation amplitude zero in the W gamma process is reported. The asymmetry distribution for the triangle eta(l, gamma) is shown to be important for probing the radiation-zero effect in the presence of high-transverse momentum photons. The impact of imposing jet veto for the final state of the W gamma process on the asymmetry distributions is reported for future pp-collision energies. Prospects of phase-space definitions including a jet veto and harder-photon recoil are discussed to compensate for the negative impact of increasing collision energy on the asymmetry distributions. The charge asymmetry distributions are proposed as sensitive observables that offer a unique opportunity for stringent tests of the SM and represent a novel method for probing departure from the SM in indirect searches for new-physics effects, independently from the existing direct searches for anomalous WW gamma coupling regarding the W gamma final state.
Açıklama
Anahtar Kelimeler
High-Energy Physics Phenomenology, Gauge Boson Pair Production, Charge Asymmetry In W Gamma Decay Process, Radiation Amplitude Zero Of W Gamma, Nnlo Qcd Prediction For W Gamma
Kaynak
Turkish Journal of Physics
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
49
Sayı
5
