B+L violation at colliders and new physics

Abstract

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 crosssection 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.

Phase shift, amplification, oscillation and attenuation of solitons in nonlinear optics

“…They can propagate in a long distance without changes in their waveform, velocity and amplitude [7], [8], [9], [10]. The soliton phenomena are closely related to nonlinear evolution equation models [11], [12], [13], [14], [15], [16], [17]. Solitons are also applied in particle physics, fluid mechanics, Bose-Einstein condensation and nonlinear optics [18], [19], [20].…”

Connection between νn→ν¯n¯ reactions and n−Hao1 2020Phys. Rev. D3010View full textAdd to dashboardCite

“…On the other hand, it is considered that the (B + L) symmetry is anomalous [22]. In some other extensions to the SM, the breaking of (B + L) symmetry is also introduced as an important feature [1,23]. Therefore, testing such global symmetries could signal new physics beyond the SM [23,24].…”

Supersymmetric sphaleron configurations as the origin of the perplexing ANITA events

“…A point worth noting at this juncture is that the energy for the height of the barrier in SUSY models is also about 10 TeV [44], and consequently the expected production rate of supersymmetric sphaleron configurations is comparable to the SM one [45]. Most importantly, the decay BR increases if the final state contains a large number of SUSY fermions [45].…”

“…A point worth noting at this juncture is that the energy for the height of the barrier in SUSY models is also about 10 TeV [44], and consequently the expected production rate of supersymmetric sphaleron configurations is comparable to the SM one [45]. Most importantly, the decay BR increases if the final state contains a large number of SUSY fermions [45]. To develop our program in the simplest way, we will work within a construct with gauge mediated SUSY breaking, in which the gravitino ψ 3/2 is the lightest supersymmetric particle (LSP) and the next-to-lightest supersymmetric (NLSP) is a long-lived binoB [46].…”

“…Note that for MB ∼ 700 GeV [47], NLSPs could be copiously produced through instanton-induced processes at √ŝ 50 TeV (see Fig. 3 in [45]), and could propagate inside the Earth without suffering catastrophic energy losses from electromagnetic interactions. The bino decays into a gravitino and a gauge boson (i.e., photon or Z-boson) with Planck-suppressed partial widths,…”