Three-generation baryon and lepton number violation at the LHC

Abstract

One of the most puzzling questions in particle physics concerns the status of the baryon (B) and lepton (L) quantum numbers. On the theoretical side, most new physics scenarios naturally lead to their non-conservation and some amount of violation is actually needed to explain the baryon asymmetry of the Universe. On the experimental side, low-energy constraints such as those on proton decay are so stringent that it is generally believed that no B and L violation will ever be seen in laboratories. We observe that this apparent contradiction, however, disappears when the flavor symmetries involving all three generations are taken into account. We then identify model-independent classes of B and/or L violating six-fermion-based processes that indeed simultaneously satisfy low-energy constraints and produce clearly identifiable signals at the LHC. Finally, through simplified models, we study two classes characterized by (ΔB;ΔL) = (\pm 1;\pm 3) and (\pm 2; 0), that lead to particularly striking signatures (t μ^+ e^+ and \bar t \bar t + jets, respectively).

arXiv comment5 pages, 2 figures, 1 table; v2: version to appear in Phys.Lett.B

References in corpus (11)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• MadGraph 5 : Going Beyond
• FeynRules - Feynman rules made easy
• Search for new physics in events with same-sign dileptons and b-tagged jets in pp collisions at sqrt(s) = 7 TeV
• Minimal Flavor Violation, Seesaw, and R-parity
• Search for pair production of first- and second-generation scalar leptoquarks in pp collisions at sqrt(s) = 7 TeV
• Search for second generation scalar leptoquarks in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Search for first generation scalar leptoquarks in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Baryon Number Violating Scalar Diquarks at the LHC
• Baryon number violation at the LHC: the top option
• Proton stability from a fourth family

Cited by in corpus (14)

• Baryogenesis from Oscillations of Charmed or Beautiful Baryons
• Short-range mechanisms of neutrinoless double beta decay at the LHC
• Lepton Flavour Violating top decays at the LHC
• $\Delta L=3$ processes: Proton decay and LHC
• The same-sign top signature of R-parity violation
• Search for baryon-number-violating ${\Xi }_b^0$ oscillations
• Same-sign top pair plus $W$ production in flavor changing vector and scalar models
• Leptoquarks, axions and the unification of B, L, and Peccei-Quinn symmetries
• Stochastic Mechanics Without Ad Hoc Quantization: Theory And Applications To Semiclassical Gravity
• Signs of Tops from Highly Mixed Stops
• Baryonic R-parity violation and its running
• Search for the baryon and lepton number violating decay $J/\psi \to p{e}^{-}$ + c.c
• $CP$ violation in heavy-flavour hadrons
• Simultaneous B and L Violation: New Signatures from RPV-SUSY