Abstract
Axion-like particles (ALPs) appear from spontaneous global symmetry breaking in many extensions of the Standard Model (SM). In this paper, we find bounds on ALP ($a$) model parameters at the LHC from the ALP production associated with a photon and a jet ($j+\gamma+a$) as well as single top and top quark pairs ($t+j+a$, $t\bar{t}+a$) in a model independent approach. In particular, it is shown that the ALP production associated with a photon plus a jet at the LHC is a promising channel with significant sensitivity to probe the ALP couplings to gluons and electroweak gauge bosons. The prospects are presented at the High Luminosity LHC including a realistic detector simulation and pile up effects. Furthermore, the ALP model is examined through its contributions to the top quark (chromo)magnetic dipole moments. It is shown that the top quark magnetic and chromomagnetic dipole moments enable us to probe the ALP couplings to top quark and gauge bosons at a time. The constraints are complementary to those obtained from direct searches, as they are sensitive to light ALPs.
Highlights
In spite of the remarkable achievements of the Standard Model (SM) of particles physics, there are observational and theoretical aspects which are not completely understood or explained within the SM framework
We find bounds on Axionlike particles (ALPs) (a) model parameters at the Large Hadron Collider (LHC) from the ALP production associated with a photon and a jet as well as single top and top quark pairs in a model-independent approach
It is shown that the ALP production associated with a photon plus a jet at the LHC is a promising channel with significant sensitivity to probe the ALP couplings to gluons and electroweak gauge bosons
Summary
In spite of the remarkable achievements of the Standard Model (SM) of particles physics, there are observational and theoretical aspects which are not completely understood or explained within the SM framework. Any model with global Uð1Þ symmetries, which are spontaneously broken, predicts pseudo-Nambu-Goldstone bosons so that their masses and couplings are independent parameters. PseudoNambu-Goldstone bosons could appear in supersymmetric (SUSY) models with SUSY dynamical breaking and a spontaneously broken R symmetry Such pseudo-NambuGoldstone bosons are called R axion and naturally expected to be light [9,10]. We study the associated production of an ALP with a photon and a jet, single top quark plus an ALP, and tt production with an ALP at the LHC to probe the ALP model parameter space. This study concentrates on a region of the ALP parameter space, in which it would not decay inside the detector and appear as missing transverse energy (EmT iss).
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
