Open Access

Semileptonic neutral current decays of $Ξ_{b}$ with dileptons or dineutrinos in the final state

Zhou Rui ^1,*, Zhi-Tian Zou ^1,†, Ya Li ^2,‡, and Ying Li^1,§

¹Department of Physics, Yantai University, Yantai 264005, China
²Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023, China

^*Contact author: jindui1127@126.com
^†Contact author: zouzt@ytu.edu.cn
^‡Contact author: liyakelly@163.com
^§Contact author: liying@ytu.edu.cn

Phys. Rev. D 113, 073003 – Published 7 April, 2026

DOI: https://doi.org/10.1103/s5wc-vdzh

Abstract

We perform a detailed analysis of semileptonic $Ξ_{b}$ decays mediated by flavor-changing neutral currents ( $b \to s$ and $b \to d$ ) with dilepton or dineutrino final states within the perturbative quantum chromodynamics (QCD) framework. All independent form factors including vector, axial-vector, tensor, and pseudotensor currents are calculated and are used to analyze the decay branching fractions and angular distributions. Our numerical results for the branching fractions of $Ξ_{b} \to Ξ ℓ^{+} ℓ^{-}$ decays suggest they are within measurable reach for the LHCb experiment in the near future. For the case of unpolarized $Ξ_{b}$ baryons, we derive several angular observables, which can provide new and complementary constraints on Wilson coefficients in semileptonic flavor changing neutral current transitions compared to those from mesonic decays. Finally, we present a combined analysis of dilepton and dineutrino channels, comparing various observables in detail. Our results offer further insights into the long-standing anomalies observed in $B$ meson decays.

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Article Text

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Phys. Rev. D 113, 073003– Published 7 April, 2026

Vol. 113, Iss. 7 — 1 April 2026

Received 10 January 2026
Accepted 23 March 2026

DOI: https://doi.org/10.1103/s5wc-vdzh

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Semileptonic neutral current decays of $Ξ_{b}$ with dileptons or dineutrinos in the final state

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Semileptonic neutral current decays of Ξb with dileptons or dineutrinos in the final state

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Semileptonic neutral current decays of $Ξ_{b}$ with dileptons or dineutrinos in the final state