Article
Astronomy & Astrophysics
S. P. Baranov, A. Lipatov, A. A. Prokhorov
Summary: The study found that under LHC conditions, the production processes associated with J/psi mesons have new significant contributions, which significantly reduce the gap between theoretical and experimental results.
Article
Astronomy & Astrophysics
N. Darvishi, M. R. Masouminia
Summary: In this study, the maximally symmetric two-Higgs doublet model (MS-2HDM) is used to investigate the signature at LHC, showing that the production of Higgs bosons through various processes aligns with the Standard Model. The presence of heavy Higgs states significantly enhances the cross section for specific production channels, indicating potential for future discoveries of this predictive extension.
Article
Physics, Particles & Fields
Amit Adhikary, Nabarun Chakrabarty, Indrani Chakraborty, Jayita Lahiri
Summary: The study focuses on probing the strength of H(+/-)W(-/+)Z interaction in new physics models at a 27 TeV proton-proton collider, finding that the H-+/- jj production process has a greater reach compared to ZH(+/-), and the discovery potential of a charged Higgs improves markedly with respect to lower centre-of-mass energies. The results are also discussed in the context of the popular Georgi-Machacek model.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Yasar Hicyilmaz, Shaaban Khalil, Stefano Moretti
Summary: In this work, we analyze a specific pp -> Higgs -> Z'Z' -> 4l (l = e, mu) signal at the LHC, where the Higgs state can be either the Standard Model-like one discovered in 2012 or a lighter state in a theoretical model with a spontaneously broken U(1)' symmetry. The additional U(1)' symmetry introduces a very light Z' state, with vector and axial (nonuniversal) fermion couplings, providing an explanation for the Atomki anomaly and consistent with experimental measurements of the anomalous magnetic moments of electron and muon, as well as beam dump experiments. We demonstrate that the cross section for this process should be large enough to be significantly observed during run 3 of the LHC.
Article
Astronomy & Astrophysics
Simone Amoroso, Mauro Chiesa, Clara Lavinia Del Pio, Katerina Lipka, Fulvio Piccinini, Federico Vazzoler, Alessandro Vicini
Summary: Measurements of neutral current Drell-Yan production at large invariant dilepton masses are used to test the energy scale dependence of the electroweak mixing angle. A novel implementation of the full next-to-leading order electroweak radiative corrections to the Drell-Yan process is used, exploring the potential of future analyses using proton-proton collisions at & RADIC;s = 13.6 TeV. The Standard Model predictions for the MS running at TeV scales can be probed.
Article
Astronomy & Astrophysics
S. Bailey, L. A. Harland-Lang
Summary: This study provides a complete prediction of the W+W- semiexclusive cross section, and provides a breakdown between elastic and proton dissociative channels. The study combines structure function calculation and a parton-level calculation, evaluating the impact of additional diagrams that are not purely photon-initiated for the first time. The study also fully accounts for the survival factor probability of no additional proton-proton interactions.
Article
Physics, Multidisciplinary
Mathias Butenschoen, Bernd A. Kniehl
Summary: We study the associated production of prompt J/psi mesons and W or Z bosons using the factorization approach of nonrelativistic QCD (NRQCD) at next-to-leading order. We find new constraints on charmonium long-distance matrix elements (LDMEs) by comparing our predictions with recent ATLAS measurements. The prompt J/psi plus W production observed by ATLAS provides evidence for the color octet mechanism inherent to NRQCD factorization.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Amir Subba, Ritesh K. Singh
Summary: We study anomalous W-W+Z = gamma couplings in the production process e-e+ -> W-W+ followed by semileptonic decay using polarizations and spin-spin correlations of W bosons. We develop an artificial neural network and a boosted decision tree to distinguish down-type jets from up-type jets and use them to put constraints on anomalous couplings at the International Linear Collider (ILC). Our findings show that the use of polarization and spin-correlation observables significantly improves the limits on anomalous coupling compared to earlier studies.
Article
Astronomy & Astrophysics
Carlos Quezada-Calonge, Antonio Dobado, Juan Jose Sanz-Cillero
Summary: This study focuses on assessing the importance of fermion loops in W+W- elastic scattering and finds that in certain parameter spaces, fermion loops can contribute significantly or even dominate with large imaginary parts.
Article
Physics, Particles & Fields
Wan-Li Ju, Marek Schonherr
Summary: The study aims to investigate the vector and axial-vector dynamics of the produced lepton pair by correlating them in two observables, the transverse momentum q(T) of the lepton pair and its azimuthal separation increment phi.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Andrew McEntaggart, Alon E. Faraggi, Marco Guzzi
Summary: We consider Z's in heterotic string derived models and study Z' resonant production at the TeV scale at the Large Hadron Collider (LHC). We explore the parameter space and investigate Z' couplings using various kinematic differential distributions for the Drell-Yan process at NNLO in QCD. In particular, we study the impact of Z-Z' kinetic-mixing interactions on forward-backward asymmetry (A(FB)) and other distributions at the LHC.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Giacomo Cacciapaglia, Antimo Cagnotta, Roberta Calabrese, Francesco Carnevali, Agostino De Iorio, Alberto Orso Maria Iorio, Stefano Morisi, Francesco Sannino
Summary: The Standard Model of particle physics is being challenged by recent precision measurements performed using different accelerator machines. Anomalies have been observed in the measurement of the muon magnetic momentum and the mass of the W boson. This paper introduces a radiative extension of the Standard Model that can reconcile these experimental results and predict the existence of new bosons and fermions within the energy range of the proton-proton collisions at the LHC experiments.
Article
Physics, Particles & Fields
C. Baldenegro, P. Gonzalez Duran, M. Klasen, C. Royon, J. Salomon
Summary: This study presents a phenomenological analysis of jet-gap-jet events, investigating the impact of various factors on the jet-gap-jet signature.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Wei Liu, Ke-Pan Xie, Zihan Yi
Summary: This study investigates the phenomenon of resonant leptogenesis and its detection at the LHC and multi-TeV muon colliders. By observing the same-sign dilepton signal feature, background interference can be effectively avoided, and the difference in event numbers between positive and negative leptons is used as a clue for CP violation.
Article
Astronomy & Astrophysics
Benjamin Fuks, Jonas Neundorf, Krisztian Peters, Richard Ruiz, Matthias Saimpert
Summary: This study revisits the sensitivity to heavy Majorana neutrinos in same-sign W+W+ scattering at the LHC, showing that a simple collider analysis can achieve remarkable signal-background separation power for detecting heavy neutrinos in a specific mass range. The (WW +/-)-W-+/- scattering channel greatly extends the mass range covered by current LHC searches for heavy Majorana neutrinos and adds invaluable sensitivity above a few hundred GeV. There is potential for improvement in the analysis and the applicability to other tests of neutrino mass models.
