B+L violation at colliders and new physics

• Published in: The journal of high energy physics Vol. 2018; no. 4; pp. 1 - 49
• Main Authors: Cerdeño, David G., Reimitz, Peter, Sakurai, Kazuki, Tamarit, Carlos
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2018; Springer Nature B.V; SpringerOpen
• Subjects: Anomalies in Field and String Theories; Beyond Standard Model; Bosons; Classical and Quantum Gravitation; Elementary Particles; Exponential functions; Fermions; High energy physics; Leptons; Nonperturbative Effects; Physics; Physics and Astronomy; Polynomials; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Theoretical Physics; Relativity Theory; Solitons Monopoles and Instantons; String Theory; Anomalies in Field and String Theories; Beyond Standard Model; Nonperturbative Effects; Solitons Monopoles and Instantons
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP04(2018)076

A bstract Chiral electroweak anomalies predict baryon ( B ) and lepton ( L ) violating fermion interactions, which can be dressed with large numbers of Higgs and gauge bosons. The estimation of the total B + L -violating rate from an initial two-particle state — potentially observable at colliders — has been the subject of an intense discussion, mainly centered on the resummation of boson emission, which is believed to contribute to the cross-section with an exponential function of the energy, yet with an exponent (the “holy-grail” function) which is not fully known in the energy range of interest. In this article we focus instead on the effect of fermions beyond the Standard-Model (SM) in the polynomial contributions to the rate. It is shown that B + L processes involving the new fermions have a polynomial contribution that can be several orders of magnitude greater than in the SM, for high centre-of-mass energies and light enough masses. We also present calculations that hint at a simple dependence of the holy grail function on the heavy fermion masses. Thus, if anomalous B + L violating interactions are ever detected at high-energy colliders, they could be associated with new physics.