Amplitude analysis of B0→ηc(1S)K+π- decays

LHCb collaboration

doi:10.1140/epjc/s10052-026-15474-w

Amplitude analysis of B0→ηc(1S)K+π- decays

LHCb collaboration

European Organization for Nuclear Research
LNF-INFN
INFN
University of Padova
Institute of High Energy Physics, Chinese Academy of Sciences
University of Chinese Academy of Sciences
University of Valencia
RWTH Aachen University
Central China Normal University
Tsinghua University
Center for High Energy Physics
University of Warwick
State Key Laboratory of Nuclear Physics and Technology
University of Heidelberg
University of Oxford
Hunan University
INFN Sezione di Bologna
Institute for Nuclear Physics
Max-Planck-Institut für Kernphysik
Universidad Andres Bello
Institute of Physics
ENAC-IIC-GEL
Department of Physics and Astronomy
University of Manchester
Université Paris-Saclay
Ip Paris

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

Abstract

An amplitude analysis of the B0→ηc(1S)K+π- decays with ηc(1S)→pp¯ is performed using a sample corresponding to an integrated luminosity of 9fb-1 of pp collision data collected by the LHCb detector at centre-of-mass energies of s = 7, 8 and 13TeV. The data are described with a model including only intermediate contributions from known K∗0 resonances. Evidence for an exotic resonance in the ηc(1S)π- system, reported in a previous analysis of this decay channel, is not confirmed. The inclusive branching fraction of the B0→ηc(1S)K+π- decays is measured to be (Formula presented.) where the first uncertainty is statistical, the second systematic, and the third arises from the limited knowledge of external branching fractions.

Original language	English
Article number	537
Journal	European Physical Journal C
Volume	86
Issue number	5
DOIs	https://doi.org/10.1140/epjc/s10052-026-15474-w
Publication status	Published - 1 May 2026

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10.1140/epjc/s10052-026-15474-w

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@article{616e96bdb9124d94b18bb9515e89c303,

title = "Amplitude analysis of B0→ηc(1S)K+π- decays",

abstract = "An amplitude analysis of the B0→ηc(1S)K+π- decays with ηc(1S)→pp¯ is performed using a sample corresponding to an integrated luminosity of 9fb-1 of pp collision data collected by the LHCb detector at centre-of-mass energies of s = 7, 8 and 13TeV. The data are described with a model including only intermediate contributions from known K∗0 resonances. Evidence for an exotic resonance in the ηc(1S)π- system, reported in a previous analysis of this decay channel, is not confirmed. The inclusive branching fraction of the B0→ηc(1S)K+π- decays is measured to be (Formula presented.) where the first uncertainty is statistical, the second systematic, and the third arises from the limited knowledge of external branching fractions.",

author = "LHCb collaboration and G. Zunica and D. Zuliani and Q. Zou and J. Zhuo and V. Zhukov and Y. Zhu and X. Zhu and X. Zhu and Zhu, \{L. Z.\} and V. Zhovkovska and Y. Zhou and X. Zhou and T. Zhou and Y. Zheng and Zheng, \{X. Z.\} and Zheng, \{S. Z.\} and A. Zhelezov and Y. Zhao and Z. Zhang and Zhang, \{Y. Z.\} and Y. Zhang and S. Zhang and S. Zhang and R. Zhang and L. Zhang and J. Zhang and D. Zhang and C. Zhang and M. Zeng and C. Zeng and F. Zenesini and M. Zdybal and M. Zavertyaev and Saa, \{J. A.Zamora\} and E. Zaffaroni and Y. Yuan and X. Yuan and J. Yu and Yu, \{C. Y.\} and X. Yin and H. Yin and H. Yeung and V. Yeroshenko and Z. Yang and Y. Yang and X. Yang and Niel, \{E. M.\} and E. Maurice and F. Fleuret and V. Balagura",

note = "Publisher Copyright: {\textcopyright} CERN for the benefit of the LHCb collaboration 2026.",

year = "2026",

month = may,

day = "1",

doi = "10.1140/epjc/s10052-026-15474-w",

language = "English",

volume = "86",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer Nature",

number = "5",

}

TY - JOUR

T1 - Amplitude analysis of B0→ηc(1S)K+π- decays

AU - LHCb collaboration

AU - Zunica, G.

AU - Zuliani, D.

AU - Zou, Q.

AU - Zhuo, J.

AU - Zhukov, V.

AU - Zhu, Y.

AU - Zhu, X.

AU - Zhu, L. Z.

AU - Zhovkovska, V.

AU - Zhou, Y.

AU - Zhou, X.

AU - Zhou, T.

AU - Zheng, Y.

AU - Zheng, X. Z.

AU - Zheng, S. Z.

AU - Zhelezov, A.

AU - Zhao, Y.

AU - Zhang, Z.

AU - Zhang, Y. Z.

AU - Zhang, Y.

AU - Zhang, S.

AU - Zhang, R.

AU - Zhang, L.

AU - Zhang, J.

AU - Zhang, D.

AU - Zhang, C.

AU - Zeng, M.

AU - Zeng, C.

AU - Zenesini, F.

AU - Zdybal, M.

AU - Zavertyaev, M.

AU - Saa, J. A.Zamora

AU - Zaffaroni, E.

AU - Yuan, Y.

AU - Yuan, X.

AU - Yu, J.

AU - Yu, C. Y.

AU - Yin, X.

AU - Yin, H.

AU - Yeung, H.

AU - Yeroshenko, V.

AU - Yang, Z.

AU - Yang, Y.

AU - Yang, X.

AU - Niel, E. M.

AU - Maurice, E.

AU - Fleuret, F.

AU - Balagura, V.

PY - 2026/5/1

Y1 - 2026/5/1

N2 - An amplitude analysis of the B0→ηc(1S)K+π- decays with ηc(1S)→pp¯ is performed using a sample corresponding to an integrated luminosity of 9fb-1 of pp collision data collected by the LHCb detector at centre-of-mass energies of s = 7, 8 and 13TeV. The data are described with a model including only intermediate contributions from known K∗0 resonances. Evidence for an exotic resonance in the ηc(1S)π- system, reported in a previous analysis of this decay channel, is not confirmed. The inclusive branching fraction of the B0→ηc(1S)K+π- decays is measured to be (Formula presented.) where the first uncertainty is statistical, the second systematic, and the third arises from the limited knowledge of external branching fractions.

AB - An amplitude analysis of the B0→ηc(1S)K+π- decays with ηc(1S)→pp¯ is performed using a sample corresponding to an integrated luminosity of 9fb-1 of pp collision data collected by the LHCb detector at centre-of-mass energies of s = 7, 8 and 13TeV. The data are described with a model including only intermediate contributions from known K∗0 resonances. Evidence for an exotic resonance in the ηc(1S)π- system, reported in a previous analysis of this decay channel, is not confirmed. The inclusive branching fraction of the B0→ηc(1S)K+π- decays is measured to be (Formula presented.) where the first uncertainty is statistical, the second systematic, and the third arises from the limited knowledge of external branching fractions.

UR - https://www.scopus.com/pages/publications/105039932708

U2 - 10.1140/epjc/s10052-026-15474-w

DO - 10.1140/epjc/s10052-026-15474-w

M3 - Article

AN - SCOPUS:105039932708

SN - 1434-6044

VL - 86

JO - European Physical Journal C

JF - European Physical Journal C

IS - 5

M1 - 537

ER -

Amplitude analysis of B0→ηc(1S)K+π- decays

Abstract

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