First Observation of CP Violation and Measurement of Polarization in B+ →ρ (770)0K∗(892)+ Decays

(LHCb Collaboration)

doi:10.1103/9zhl-kkwg

First Observation of CP Violation and Measurement of Polarization in B+ →ρ (770)0K^∗(892)+ Decays

(LHCb Collaboration)

Research output: Contribution to journal › Article › peer-review

Abstract

An amplitude analysis of the B+→(π+π-)(KS0π+) decay is performed in the mass regions 0.30<mπ+π-<1.10 GeV/c2 and 0.75<mKS0π+<1.20 GeV/c2, using pp collision data recorded with the LHCb detector corresponding to an integrated luminosity of 9 fb-1. The polarization fractions and CP asymmetries for B+→ρ(770)0K∗(892)+ decays are measured. Violation of the CP symmetry in the decay B+→ρ(770)0K∗(892)+ is observed for the first time, with a significance exceeding 9 standard deviations. The CP asymmetry is measured to be ACP=0.507±0.062(stat)±0.024(syst) and the CP-averaged longitudinal polarization fraction of fL=0.720±0.028(stat)±0.009(syst). The measurements help to shed light on the polarization puzzle of B mesons decaying to two vector mesons.

Original language	English
Article number	021803
Journal	Physical Review Letters
Volume	136
Issue number	2
DOIs	https://doi.org/10.1103/9zhl-kkwg
Publication status	Published - 16 Jan 2026

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title = "First Observation of CP Violation and Measurement of Polarization in B+ →ρ (770)0K∗(892)+ Decays",

abstract = "An amplitude analysis of the B+→(π+π-)(KS0π+) decay is performed in the mass regions 0.30",

author = "\{(LHCb Collaboration)\} and R. Aaij and Abdelmotteleb, \{A. S.W.\} and \{Abellan Beteta\}, C. and F. Abudin{\'e}n and T. Ackernley and Adefisoye, \{A. A.\} and B. Adeva and M. Adinolfi and P. Adlarson and C. Agapopoulou and Aidala, \{C. A.\} and Z. Ajaltouni and S. Akar and K. Akiba and P. Albicocco and J. Albrecht and R. Aleksiejunas and F. Alessio and \{Alvarez Cartelle\}, P. and R. Amalric and S. Amato and Amey, \{J. L.\} and Y. Amhis and L. An and L. Anderlini and M. Andersson and P. Andreola and M. Andreotti and \{Andres Estrada\}, S. and A. Anelli and D. Ao and C. Arata and F. Archilli and Z. Areg and M. Argenton and \{Arguedas Cuendis\}, S. and L. Arnone and A. Artamonov and M. Artuso and E. Aslanides and \{Ata{\'i}de Da Silva\}, R. and M. Atzeni and B. Audurier and Authier, \{J. A.\} and D. Bacher and \{Bachiller Perea\}, I. and S. Bachmann and V. Balagura and F. Fleuret and E. Maurice",

note = "Publisher Copyright: {\textcopyright} 2026 CERN.",

year = "2026",

month = jan,

day = "16",

doi = "10.1103/9zhl-kkwg",

language = "English",

volume = "136",

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T1 - First Observation of CP Violation and Measurement of Polarization in B+ →ρ (770)0K∗(892)+ Decays

AU - (LHCb Collaboration)

AU - Aaij, R.

AU - Abdelmotteleb, A. S.W.

AU - Abellan Beteta, C.

AU - Abudinén, F.

AU - Ackernley, T.

AU - Adefisoye, A. A.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adlarson, P.

AU - Agapopoulou, C.

AU - Aidala, C. A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Akiba, K.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Aleksiejunas, R.

AU - Alessio, F.

AU - Alvarez Cartelle, P.

AU - Amalric, R.

AU - Amato, S.

AU - Amey, J. L.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andersson, M.

AU - Andreola, P.

AU - Andreotti, M.

AU - Andres Estrada, S.

AU - Anelli, A.

AU - Ao, D.

AU - Arata, C.

AU - Archilli, F.

AU - Areg, Z.

AU - Argenton, M.

AU - Arguedas Cuendis, S.

AU - Arnone, L.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Ataíde Da Silva, R.

AU - Atzeni, M.

AU - Audurier, B.

AU - Authier, J. A.

AU - Bacher, D.

AU - Bachiller Perea, I.

AU - Bachmann, S.

AU - Balagura, V.

AU - Fleuret, F.

AU - Maurice, E.

PY - 2026/1/16

Y1 - 2026/1/16

N2 - An amplitude analysis of the B+→(π+π-)(KS0π+) decay is performed in the mass regions 0.30

AB - An amplitude analysis of the B+→(π+π-)(KS0π+) decay is performed in the mass regions 0.30

UR - https://www.scopus.com/pages/publications/105027640209

U2 - 10.1103/9zhl-kkwg

DO - 10.1103/9zhl-kkwg

M3 - Article

AN - SCOPUS:105027640209

SN - 0031-9007

VL - 136

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 021803

ER -

First Observation of CP Violation and Measurement of Polarization in B+ →ρ (770)0K^∗(892)+ Decays

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