LHC dijet constraints on double beta decay

Abstract

We use LHC dijet data to derive constraints on neutrinoless double beta decay. Upper limits on cross sections for the production of "exotic" resonances, such as a right-handed W boson or a diquark, can be converted into lower limits on the double beta decay half-life for fixed choices of other parameters. Constraints derived from run-I data are already surprisingly strong and complementary to results from searches using same-sign dileptons plus jets. For the case of the left-right symmetric model, in case no new resonance is found in future runs of the LHC and assuming g L = g R , we estimate a lower limit on the double beta decay half-live larger than 10 27 ys can be derived from future dijet data, except in the window of relatively light right-handed neutrino masses in the range 0.5 MeV to 50 GeV. Part of this mass window will be tested in the upcoming SHiP experiment. We also discuss current and future limits on possible scalar diquark contributions to double beta decay that can be derived from dijet data.

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

“…All these bounds can be found in [233,[305][306][307][308][309][310][311][312][313][314][315][316][317][318]. Projected limits using the Large…”

The mass ratios parametrization

“…A clear signal of neutrinos as their own antiparticles may be reached through the study of processes where total lepton number is violated. In this sense, neutrinoless double beta decay (0νββ), where total lepton number is violated by two units, offers a rare decay to not only unveil the true massive nature of neutrinos but also to test predictions of left-right symmetric models and other models including right-handed currents and heavy neutral leptons [70,71]. This rare process consists in an atom decaying into another one with the emission of two electrons,…”

Scalar-mediated double beta decay and LHC

“…No new resonances have been observed in these searches, both collaborations give instead upper limits on σ ×BR as a function of resonance mass. While dijet data of course can not be used to establish the existence of LNV, nonobservation of new resonances in dijet searches at the LHC can be used to obtain limits on 0νββ decay [25]. In our analysis, presented below, we will also estimate the reach of future LHC data and compare it to expectations for the LNV searches.…”