Constraints on leptoquark models from IceCube data

Abstract

Leptoquarks in the mass range of 500-1000 GeV can be resonantly produced in significant numbers by PeV neutrino interacting with nuclei at IceCube. We compute the event rates of leptoquark production and decay events and use the 3-year IceCube data for PeV energy events to find the allowed range of the leptoquarks mass and coupling parameter space. We use a low-scale quark lepton unification model based on the SU(4) C ⊗ SU(2) L ⊗ U(1) R gauge group where leptoquark couplings which give rise to proton decay are forbidden by the symmetry. We constrain the parameters of this model and point out signals of leptoquarks in this model which may be seen in PeV energy IceCube events in the future.

Constraints on neutrino speed, weak equivalence principle violation, Lorentz invariance violation, and dual lensing from the first high-energy astrophysical neutrino source TXS 0506+056

“…Predictably, a lot of excitement have been generated by this momentous discovery [3][4][5][6][7][8][9][10][11]. Together with the prior discovery of a diffuse flux of high-energy astrophysical neutrinos [12,13], these observations provide us a new way to probe beyond the Standard model physics [14][15][16][17][18][19][20][21][22], new IceCube signal morphologies [23,24], and atmospheric prompt neutrinos [25][26][27][28][29][30][31][32].…”

Signatures of Supersymmetry in Neutrino Telescopes

“…Even without SUSY, similar resonance features in neutrino-nucleon interactions can also occur in models with TeV-scale leptoquarks[95][96][97][98][99][100][101][102][103]. However, there are subtle differences between scalar leptoquark and RPV SUSY models, e.g.…”

Searching for leptoquarks at IceCube and the LHC

“…This distinction is important, as the different contributions to the event rates have very different topological signatures. These are crucial: previous studies [50,52,53,56,57] have examined the impact of an extra leptoquark-induced interaction (or a similar R-parity violating SUSY model [54]) on the best-fit fluxes reported by the IceCube Collaboration. However, this is not self-consistent, as the fluxes were derived using the same data set.…”

“…Indeed, the center of mass energy scale of a PeV neutrino colliding with a nucleon at rest is just the right scale to excite a ∼TeV leptoquark resonance [65]. Many studies have made the claim that such a process can improve the fit to the observed event rate [50,[52][53][54]56,57]. These are often framed in terms of an excess that requires a nonstandard explanation; however, it should be stressed that the observed event rate falls within the expected Waxman-Bahcall flux [66], consistent with a common origin with cosmic rays (see also [67] for a review).…”