Measurements of time-dependent b-hadron properties in LHCb
Abstract
These proceedings present the latest measurements of time-dependent properties of b-hadrons using the LHCb Run 2 data set. Three results are presented. The first of these is a measurement of the CKM phase ϕs with Bs0→ J/ψπ+π-. This result improves the determination in this channel, obtaining a result of ϕs = −77±34(stat)±7(syst) mrad. This result is included in the LHCb global average to obtain ϕs = −41±17 mrad. Additionally, a determination of the penguin contributions, Δϕs, to measurements of ϕs using B0→ J/ψρ0(770) is presented. This measurement constitutes the first observation of CP-violation in B0 → J/ψρ0(770) decays. The CKM phase 2β is measured and is determined to be 2βeffccd = 0.710±0.084±0.051 rad. The most stringent constraint on penguin contributions is obtained and determined to be Δϕs = 5.0±4.6 mrad. Finally, the first measurement of time-dependent CP-violation in a b→ s l+ l- process using the decay $B_s^0 \to K_S μ^+ μ^- $ is presented. The time-dependent coefficients of this decay are determined to be C=−0.13±0.32(stat)±0.04(syst) and S=+0.82±0.29(stat)±0.05(syst).
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BibTeX
@misc{foreman2026measurements,
title = {{Measurements of time-dependent b-hadron properties in LHCb}},
author = {Lucas Foreman},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.26188},
eprint = {2610.26188},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.26188},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Measurements of time-dependent b-hadron properties in LHCb
AU - Lucas Foreman
PY - 2026
DA - 2026/10/19
PB - arXiv
DO - 10.48550/arxiv.2610.26188
UR - https://arxiv.org/abs/2610.26188
AB - These proceedings present the latest measurements of time-dependent properties of b-hadrons using the LHCb Run 2 data set. Three results are presented. The first of these is a measurement of the CKM phase ϕ_s with B_s^0→ J/ψπ^+π^-. This result improves the determination in this channel, obtaining a result of ϕ_s = −77±34(stat)±7(syst) mrad. This result is included in the LHCb global average to obtain ϕ_s = −41±17 mrad. Additionally, a determination of the penguin contributions, Δϕ_s, to measurements of ϕ_s using B^0→ J/ψρ^0(770) is presented. This measurement constitutes the first observation of CP-violation in B_0 → J/ψρ^0(770) decays. The CKM phase 2β is measured and is determined to be 2β^eff_ccd = 0.710±0.084±0.051 rad. The most stringent constraint on penguin contributions is obtained and determined to be Δϕ_s = 5.0±4.6 mrad. Finally, the first measurement of time-dependent CP-violation in a b→ s l^+ l^- process using the decay $B_s^0 \to K_S μ^+ μ^- $ is presented. The time-dependent coefficients of this decay are determined to be C=−0.13±0.32(stat)±0.04(syst) and S=+0.82±0.29(stat)±0.05(syst).
ER -