Evidence for an ηc(1S) π- resonance in B0→ ηc(1S) K+π- decays

LHCb Collaboration; R. Aaij; C. Abellán Beteta; B. Adeva; M. Adinolfi; C. A. Aidala; Z. Ajaltouni; S. Akar; P. Albicocco; J. Albrecht; F. Alessio; M. Alexander; A. Alfonso Albero; G. Alkhazov; P. Alvarez Cartelle; A. A. Alves; S. Amato; S. Amerio; Y. Amhis; L. An; L. Anderlini; G. Andreassi; M. Andreotti; J. E. Andrews; R. B. Appleby; F. Archilli; P. d’Argent; J. Arnau Romeu; A. Artamonov; M. Artuso; K. Arzymatov; E. Aslanides; M. Atzeni; B. Audurier; S. Bachmann; J. J. Back; S. Baker; S. Bifani; R. Calladine; G. Chatzikonstantinidis; N. Farley; P. Ilten; C. Lazzeroni; A. Mazurov; J. Plews; D. Popov; A. Sergi; M. W. Slater; N. K. Watson; T. Williams; K. A. Zarebski

doi:10.1140/epjc/s10052-018-6447-z

Evidence for an η_c(1S) π^- resonance in B⁰→ η_c(1S) K⁺π^- decays

LHCb Collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, C. A. Aidala, Z. Ajaltouni, S. Akar, P. Albicocco, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. AnL. Anderlini, G. Andreassi, M. Andreotti, J. E. Andrews, R. B. Appleby, F. Archilli, P. d’Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, K. Arzymatov, E. Aslanides, M. Atzeni, B. Audurier, S. Bachmann, J. J. Back, S. Baker, S. Bifani, R. Calladine, G. Chatzikonstantinidis, N. Farley, P. Ilten, C. Lazzeroni, A. Mazurov, J. Plews, D. Popov, A. Sergi, M. W. Slater, N. K. Watson, T. Williams, K. A. Zarebski

Physics and Astronomy

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Abstract

A Dalitz plot analysis of B⁰→η_c(1S)K⁺π^- decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of √s=7, 8 and 13TeV, corresponding to a total integrated luminosity of 4.7fb^-1. A satisfactory description of the data is obtained when including a contribution representing an exotic η_c(1S) π^- resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096±20_-22⁺¹⁸MeV and 152±58_-35⁺⁶⁰MeV, respectively. The spin-parity assignments J^P= 0⁺ and J^P= 1^- are both consistent with the data. In addition, the first measurement of the B⁰→η_c(1S)K⁺π^- branching fraction is performed and gives

B(B⁰→η_c(1S)K⁺π^-)=(5.73±0.24±0.13±0.66)×10^-4,

where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions.

Original language	English
Article number	1019
Number of pages	23
Journal	European Physical Journal C
Volume	78
Issue number	12
Early online date	17 Dec 2018
DOIs	https://doi.org/10.1140/epjc/s10052-018-6447-z
Publication status	Published - Dec 2018

ASJC Scopus subject areas

Engineering (miscellaneous)
Physics and Astronomy (miscellaneous)

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R_Aaij_et_al_Evidence_for_an_ηc(1S)_π-_resonance_in_B0_European_Physical_Journal_C_2018
Checked for eligibility: 16/01/2018
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Cite this

LHCb Collaboration, Aaij, R., Beteta, C. A., Adeva, B., Adinolfi, M., Aidala, C. A., Ajaltouni, Z., Akar, S., Albicocco, P., Albrecht, J., Alessio, F., Alexander, M., Albero, A. A., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., ... Zarebski, K. A. (2018). Evidence for an η_c(1S) π^- resonance in B⁰→ η_c(1S) K⁺π^- decays. European Physical Journal C, 78(12), Article 1019. Advance online publication. https://doi.org/10.1140/epjc/s10052-018-6447-z

@article{d38e708bd557497d9de85d8e943273b2,

title = "Evidence for an ηc(1S) π- resonance in B0→ ηc(1S) K+π- decays",

abstract = "A Dalitz plot analysis of B0→ηc(1S)K+π- decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of √s=7, 8 and 13TeV, corresponding to a total integrated luminosity of 4.7fb-1. A satisfactory description of the data is obtained when including a contribution representing an exotic ηc(1S) π- resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096±20-22+18MeV and 152±58-35+60MeV, respectively. The spin-parity assignments JP= 0+ and JP= 1- are both consistent with the data. In addition, the first measurement of the B0→ηc(1S)K+π- branching fraction is performed and givesB(B0→ηc(1S)K+π-)=(5.73±0.24±0.13±0.66)×10-4,where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions.",

author = "{LHCb Collaboration} and R. Aaij and Beteta, {C. Abell{\'a}n} and B. Adeva and M. Adinolfi and Aidala, {C. A.} and Z. Ajaltouni and S. Akar and P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and Albero, {A. Alfonso} and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and F. Archilli and P. d{\textquoteright}Argent and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and Back, {J. J.} and S. Baker and S. Bifani and R. Calladine and G. Chatzikonstantinidis and N. Farley and P. Ilten and C. Lazzeroni and A. Mazurov and J. Plews and D. Popov and A. Sergi and Slater, {M. W.} and Watson, {N. K.} and T. Williams and Zarebski, {K. A.}",

year = "2018",

month = dec,

doi = "10.1140/epjc/s10052-018-6447-z",

language = "English",

volume = "78",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer",

number = "12",

}

LHCb Collaboration, Aaij, R, Beteta, CA, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F, Alexander, M, Albero, AA, Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Appleby, RB, Archilli, F, d’Argent, P, Arnau Romeu, J, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Bifani, S, Calladine, R, Chatzikonstantinidis, G, Farley, N, Ilten, P , Lazzeroni, C, Mazurov, A, Plews, J, Popov, D, Sergi, A, Slater, MW , Watson, NK, Williams, T & Zarebski, KA 2018, 'Evidence for an η_c(1S) π^- resonance in B⁰→ η_c(1S) K⁺π^- decays', European Physical Journal C, vol. 78, no. 12, 1019. https://doi.org/10.1140/epjc/s10052-018-6447-z

TY - JOUR

T1 - Evidence for an ηc(1S) π- resonance in B0→ ηc(1S) K+π- decays

AU - LHCb Collaboration

AU - Aaij, R.

AU - Beteta, C. Abellán

AU - Adeva, B.

AU - Adinolfi, M.

AU - Aidala, C. A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Albero, A. Alfonso

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - d’Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Back, J. J.

AU - Baker, S.

AU - Bifani, S.

AU - Calladine, R.

AU - Chatzikonstantinidis, G.

AU - Farley, N.

AU - Ilten, P.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - Plews, J.

AU - Popov, D.

AU - Sergi, A.

AU - Slater, M. W.

AU - Watson, N. K.

AU - Williams, T.

AU - Zarebski, K. A.

PY - 2018/12

Y1 - 2018/12

N2 - A Dalitz plot analysis of B0→ηc(1S)K+π- decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of √s=7, 8 and 13TeV, corresponding to a total integrated luminosity of 4.7fb-1. A satisfactory description of the data is obtained when including a contribution representing an exotic ηc(1S) π- resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096±20-22+18MeV and 152±58-35+60MeV, respectively. The spin-parity assignments JP= 0+ and JP= 1- are both consistent with the data. In addition, the first measurement of the B0→ηc(1S)K+π- branching fraction is performed and givesB(B0→ηc(1S)K+π-)=(5.73±0.24±0.13±0.66)×10-4,where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions.

AB - A Dalitz plot analysis of B0→ηc(1S)K+π- decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of √s=7, 8 and 13TeV, corresponding to a total integrated luminosity of 4.7fb-1. A satisfactory description of the data is obtained when including a contribution representing an exotic ηc(1S) π- resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096±20-22+18MeV and 152±58-35+60MeV, respectively. The spin-parity assignments JP= 0+ and JP= 1- are both consistent with the data. In addition, the first measurement of the B0→ηc(1S)K+π- branching fraction is performed and givesB(B0→ηc(1S)K+π-)=(5.73±0.24±0.13±0.66)×10-4,where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions.

UR - http://www.scopus.com/inward/record.url?scp=85058819530&partnerID=8YFLogxK

U2 - 10.1140/epjc/s10052-018-6447-z

DO - 10.1140/epjc/s10052-018-6447-z

M3 - Article

AN - SCOPUS:85058819530

SN - 1434-6044

VL - 78

JO - European Physical Journal C

JF - European Physical Journal C

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