Coloured Scalar Mediated Nucleon Decays to Invisible Fermion

Abstract

We investigate nucleon decays to light invisible fermion mediated by the coloured scalar ${\bar{S}}_1=(\bar{3},1,-2/3)$ and compare them with the results coming from the mediation of $S_1=(\bar{3},1,1/3)$. In the case of ${\bar{S}}_1=(\bar{3},1,-2/3)$ up-like quarks couple to the invisible fermion, while in the case of $S_1=(\bar{3},1,1/3)$ the down-like quarks couple to the invisible fermion. For the mass of invisible fermion smaller than the mass $m_p-m_K$, proton (neutron) can decay to $K$ and invisible fermion and the masses of ${\bar{S}}_1$ and $S_1$ are in the region $\sim 10^{15}$ GeV. The decays of nucleons to pions and invisible fermion can occur at the tree-level, but in the case of ${\bar{S}}_1$ they come from dimension-9 operator and are therefore suppressed by several orders of magnitude compared to the decays into kaons. For the invisible fermion mass in the range $(937.8\mathrm{MeV},938.8\mathrm{MeV})$, decay of neutron $n\to \chi \gamma$ induced by ${\bar{S}}_1$ is possible at the loop level, while the proton remains stable. The branching ratio of such decay is $\le 10^{-6}$, which does not explain neutron decay anomaly, but is in agreement with the Borexino experiment bound. We comment on low-energy processes with the nucleon-like mass of $\chi$ in the final state as $\Lambda \to \chi \gamma$ and heavy hadron decays to invisibles.

10 pages, 12 figures, to be published in Phys. Rev. D

References in corpus (19)

• Heavy Majorana Neutrinos in the Effective Lagrangian Description: Application to Hadron Colliders
• Neutron -- Mirror Neutron Oscillation: How Fast Might It Be?
• New strategies for New Physics search in B -> K* nu anti-nu, B -> K nu anti-nu and B -> X(s) nu anti-nu decays
• $\Delta M_s$ theory precision confronts flavour anomalies
• Flavored dark matter beyond Minimal Flavor Violation
• Proton decay matrix elements with domain-wall fermions
• Affleck-Dine inflation
• Light particles with baryon and lepton numbers
• Charming Dark Matter
• Search for Trilepton Nucleon Decay via $p\to e^{+}\nu \nu$ and $p\to {\mu }^{+}\nu \nu$ in the Super-Kamiokande Experiment
• Nucleon Decay into Dark Sector
• Neutron Decay to a Non-Abelian Dark Sector
• LHC Constraints on Scalar Diquarks
• Dark Matter Capture by Atomic Nuclei
• Spin-$1/2$ invisible particles in heavy meson decays
• Search for baryon and lepton number violating decays $D^{+}\to \bar{\Lambda }({\bar{\Sigma }}^0)e^{+}$ and $D^{+}\to \Lambda ({\Sigma }^0)e^{+}$
• How long does the hydrogen atom live?
• Fermionic Dark Matter in a simple $t$-channel model
• Neutron lifetime beam anomaly and possible explanation

Cited by in corpus (17)

• Collider Signals of Baryogenesis and Dark Matter from $B$ Mesons: A Roadmap to Discovery
• Neutron - mirror neutron mixing and neutron stars
• Neutron Stars with Baryon Number Violation, Probing Dark Sectors
• Cosmological and astrophysical probes of dark baryons
• Coloured Scalars Mediated Rare Charm Meson Decays to Invisible Fermions
• Neutron Dark Decay
• Baryogenesis through Asymmetric Reheating in the Mirror Twin Higgs
• Probing Dark Sectors with Neutron Stars
• How Macroscopic Limits on Neutron Star Baryon Loss Yield Microscopic Limits on Non-Standard-Model Baryon Decay
• Stellar Signals of a Baryon-Number-Violating Long-Range Force
• Decay dynamics of $N\to \ell \pi$ and $N\to \ell \gamma$
• Baryon Number Violation: From Nuclear Matrix Elements to BSM Physics
• Baryonic and Leptonic GeV Dark Matter
• Nucleon Decays into Light New Particles in Neutrino Detectors
• Neutron-neutral particle mixing and its observable consequences
• New Physics Searches at Kaon and Hyperon Factories
• The Strange Physics of Dark Baryons