Baryon-Number Violating Λc Decays from Light-Cone Sum Rules
Abstract
Baryon-number-violating decays with missing energy probe new interactions connecting Standard-Model quarks to light invisible fermions. Such signatures can arise from dimension-six operators coupling three quarks to an SM-singlet fermion χ, which escapes detection. With a suitable baryon-number assignment for χ, total baryon number is conserved while its violation is apparent in the visible sector. We study the exclusive decays Λc→πχ̅ and Λc→ Kχ̅, determining the required form factors using light-cone sum rules with pion and kaon distribution amplitudes. The calculation includes leading-order two-particle contributions up to twist four and factorisable four-particle terms. Two Λc interpolating currents are employed to assess the current dependence. Using single-operator benchmarks based on collider bounds, we obtain branching fractions of order 10−7 over sizeable parts of the physical region, with uncertainty envelopes reaching 10−6 in some scenarios. These are indicative estimates within the retained light-cone expansion. We compare with existing chiral-perturbation-theory and QCD-factorisation estimates and discuss experimental prospects. Future data from STCF and Belle II could probe part of the predicted range, while FCC-ee could reach smaller branching fractions.
Related
- Chiral matching of dimension-7 baryon-number-violating operators and application to ΔI=3/2 nucleon decays
- Baryon-number-violating nucleon decays into a dark photon particle
- Baryon-number-violating nucleon decays into a dark photon particle
- U-spin sum rules in charmed baryon decays beyond the U-spin limit
- Reinterpreting ATLAS Dijet and Supersymmetry Searches in A Baryon-Number-Violating Heavy Scalar Framework
BibTeX
@misc{mohamed2026baryonnumber,
title = {{Baryon-Number Violating $Λ_c$ Decays from Light-Cone Sum Rules}},
author = {Ali Mohamed},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.37987},
eprint = {2610.37987},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.37987},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Baryon-Number Violating Λ_c Decays from Light-Cone Sum Rules
AU - Ali Mohamed
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2610.37987
UR - https://arxiv.org/abs/2610.37987
AB - Baryon-number-violating decays with missing energy probe new interactions connecting Standard-Model quarks to light invisible fermions. Such signatures can arise from dimension-six operators coupling three quarks to an SM-singlet fermion χ, which escapes detection. With a suitable baryon-number assignment for χ, total baryon number is conserved while its violation is apparent in the visible sector. We study the exclusive decays Λ_c→πχ̅ and Λ_c→ Kχ̅, determining the required form factors using light-cone sum rules with pion and kaon distribution amplitudes. The calculation includes leading-order two-particle contributions up to twist four and factorisable four-particle terms. Two Λ_c interpolating currents are employed to assess the current dependence. Using single-operator benchmarks based on collider bounds, we obtain branching fractions of order 10^−7 over sizeable parts of the physical region, with uncertainty envelopes reaching 10^−6 in some scenarios. These are indicative estimates within the retained light-cone expansion. We compare with existing chiral-perturbation-theory and QCD-factorisation estimates and discuss experimental prospects. Future data from STCF and Belle II could probe part of the predicted range, while FCC-ee could reach smaller branching fractions.
ER -