Recent results in b → s ℓℓ transitions at LHCb
Abstract
Rare decays of B hadrons, such as b→ sℓ ℓ processes, provide great avenues to search for the influence of new physics (NP). They are highly suppressed in the Standard Model (SM) and therefore sensitive to NP contributions. In recent years, experimental measurements have shown tension with SM predictions. It is still up for debate whether these stem from genuine NP or an incomplete understanding of the theory. These proceedings focus on the recent efforts of the LHCb collaboration to advance this field. Some of the results covered show that tensions in these processes, like in B0 → K*0 μ+ μ-, still persist upon higher precision. Others aim to shed some light on the theoretical picture through amplitude analyses of decays like B0 → K*0 μ+ μ- and B+ → K+ μ+ μ-. We also present two innovative measurements: the branching fraction of B0 → K+ π- μ+ μ- at large dihadron mass; and the first hadron collider measurement of the lepton flavour universality ratio of B0 → K*0 ℓ+ℓ- at high q2 (dilepton mass squared).
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BibTeX
@misc{castella2026recent,
title = {{Recent results in $b \rightarrow s\,\ell\ell$ transitions at LHCb}},
author = {Juan Jose Juan Castella},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.13165},
eprint = {2610.13165},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.13165},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Recent results in b → s ℓℓ transitions at LHCb
AU - Juan Jose Juan Castella
PY - 2026
DA - 2026/10/09
PB - arXiv
DO - 10.48550/arxiv.2610.13165
UR - https://arxiv.org/abs/2610.13165
AB - Rare decays of B hadrons, such as b→ sℓ ℓ processes, provide great avenues to search for the influence of new physics (NP). They are highly suppressed in the Standard Model (SM) and therefore sensitive to NP contributions. In recent years, experimental measurements have shown tension with SM predictions. It is still up for debate whether these stem from genuine NP or an incomplete understanding of the theory. These proceedings focus on the recent efforts of the LHCb collaboration to advance this field. Some of the results covered show that tensions in these processes, like in B^0 → K^*0 μ^+ μ^-, still persist upon higher precision. Others aim to shed some light on the theoretical picture through amplitude analyses of decays like B^0 → K^*0 μ^+ μ^- and B^+ → K^+ μ^+ μ^-. We also present two innovative measurements: the branching fraction of B^0 → K^+ π^- μ^+ μ^- at large dihadron mass; and the first hadron collider measurement of the lepton flavour universality ratio of B^0 → K^*0 ℓ^+ℓ^- at high q^2 (dilepton mass squared).
ER -