Evidence of a J/?? structure and observation of excited ?- states in the ?b- ? J/??K- decay

R. Aaij; C. Abellan Beteta; T. Ackernley; B. Adeva; M. Adinolfi; H. Afsharnia; C. A. Aidala; S. Aiola; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; A. Alfonso Albero; Z. Aliouche; G. Alkhazov; P. Alvarez Cartelle; S. Amato; Y. Amhis; L. An; L. Anderlini; A. Andreianov; M. Andreotti; F. Archilli; A. Artamonov; M. Artuso; K. Arzymatov; E. Aslanides; M. Atzeni; B. Audurier; S. Bachmann; M. Bachmayer; J. J. Back; S. Baker; P. Baladron Rodriguez; V Balagura; W. Baldini; J. Baptista Leite; R. J. Barlow; S. Barsuk; W. Barter; M. Bartolini; F. Baryshnikov; J. M. Basels; G. Bassi; B. Batsukh; A. Battig; A. Bay; M. Becker; F. Bedeschi; LHCb collaboration; Jacco de Vries; Chris Pawley; Marcel Merk

doi:10.1016/j.scib.2021.02.030

Evidence of a J/?? structure and observation of excited ?- states in the ?b- ? J/??K- decay

R. Aaij^*, C. Abellan Beteta, T. Ackernley, B. Adeva, M. Adinolfi, H. Afsharnia, C. A. Aidala, S. Aiola, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, Z. Aliouche, G. Alkhazov, P. Alvarez Cartelle, S. Amato, Y. Amhis, L. AnL. Anderlini, A. Andreianov, M. Andreotti, F. Archilli, A. Artamonov, M. Artuso, K. Arzymatov, E. Aslanides, M. Atzeni, B. Audurier, S. Bachmann, M. Bachmayer, J. J. Back, S. Baker, P. Baladron Rodriguez, V Balagura, W. Baldini, J. Baptista Leite, R. J. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J. M. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay, M. Becker, F. Bedeschi, LHCb collaboration, Jacco de Vries, Chris Pawley, Marcel Merk

^*Corresponding author for this work

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

Abstract

First evidence of a structure in the J/psi Lambda invariant mass distribution is obtained from an amplitude analysis of Xi(-)(b) -> J/psi Lambda K- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere effect. Its mass and width are determined to be 4458.8 +/- 2.9(-1.1)(+4.7) MeV and 17.3 +/- 6.5(-5.7)(+8.0) MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Xi(-) states, Xi(-)(1690) and Xi(-)(1820)(-), are seen for the first time in a Xi(-)(b) decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb(-1), collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV. (c) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Original language	English
Pages (from-to)	1278-1287
Number of pages	10
Journal	Science Bulletin
Volume	66
Issue number	13
Early online date	1 Jun 2021
DOIs	https://doi.org/10.1016/j.scib.2021.02.030
Publication status	Published - 15 Jul 2021

Keywords

QCD
Exotics
Pentaquark
Spectroscopy
Quarkonium
Particle and resonance production
TOOL

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Aaij, R., Beteta, C. A., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C. A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Cartelle, P. A., Amato, S., Amhis, Y., ... Merk, M. (2021). Evidence of a J/?? structure and observation of excited ?- states in the ?b- ? J/??K- decay. Science Bulletin, 66(13), 1278-1287. https://doi.org/10.1016/j.scib.2021.02.030

@article{d47348a85fa6428ebd462fec54e6c2b9,

title = "Evidence of a J/?? structure and observation of excited ?- states in the ?b- ? J/??K- decay",

abstract = "First evidence of a structure in the J/psi Lambda invariant mass distribution is obtained from an amplitude analysis of Xi(-)(b) -> J/psi Lambda K- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere effect. Its mass and width are determined to be 4458.8 +/- 2.9(-1.1)(+4.7) MeV and 17.3 +/- 6.5(-5.7)(+8.0) MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Xi(-) states, Xi(-)(1690) and Xi(-)(1820)(-), are seen for the first time in a Xi(-)(b) decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb(-1), collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV. (c) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).",

keywords = "QCD, Exotics, Pentaquark, Spectroscopy, Quarkonium, Particle and resonance production, TOOL",

author = "R. Aaij and Beteta, {C. Abellan} and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and Aidala, {C. A.} and S. Aiola and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and Z. Aliouche and G. Alkhazov and Cartelle, {P. Alvarez} and S. Amato and Y. Amhis and L. An and L. Anderlini and A. Andreianov and M. Andreotti and F. Archilli and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and M. Bachmayer and Back, {J. J.} and S. Baker and {Baladron Rodriguez}, P. and V Balagura and W. Baldini and Leite, {J. Baptista} and Barlow, {R. J.} and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and Basels, {J. M.} and G. Bassi and B. Batsukh and A. Battig and A. Bay and M. Becker and F. Bedeschi and {LHCb collaboration} and {de Vries}, Jacco and Chris Pawley and Marcel Merk",

year = "2021",

month = jul,

day = "15",

doi = "10.1016/j.scib.2021.02.030",

language = "English",

volume = "66",

pages = "1278--1287",

journal = "Science Bulletin",

issn = "2095-9273",

publisher = "Springer",

number = "13",

}

Aaij, R, Beteta, CA, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Aliouche, Z, Alkhazov, G, Cartelle, PA, Amato, S, Amhis, Y, An, L, Anderlini, L, Andreianov, A, Andreotti, M, Archilli, F, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Bachmayer, M, Back, JJ, Baker, S, Baladron Rodriguez, P, Balagura, V, Baldini, W, Leite, JB, Barlow, RJ, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Basels, JM, Bassi, G, Batsukh, B, Battig, A, Bay, A, Becker, M, Bedeschi, F, LHCb collaboration, de Vries, J , Pawley, C & Merk, M 2021, 'Evidence of a J/?? structure and observation of excited ?- states in the ?b- ? J/??K- decay', Science Bulletin, vol. 66, no. 13, pp. 1278-1287. https://doi.org/10.1016/j.scib.2021.02.030

TY - JOUR

T1 - Evidence of a J/?? structure and observation of excited ?- states in the ?b- ? J/??K- decay

AU - Aaij, R.

AU - Beteta, C. Abellan

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Aidala, C. A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Aliouche, Z.

AU - Alkhazov, G.

AU - Cartelle, P. Alvarez

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreianov, A.

AU - Andreotti, M.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Baker, S.

AU - Baladron Rodriguez, P.

AU - Balagura, V

AU - Baldini, W.

AU - Leite, J. Baptista

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Bartolini, M.

AU - Baryshnikov, F.

AU - Basels, J. M.

AU - Bassi, G.

AU - Batsukh, B.

AU - Battig, A.

AU - Bay, A.

AU - Becker, M.

AU - Bedeschi, F.

AU - LHCb collaboration

AU - de Vries, Jacco

AU - Pawley, Chris

AU - Merk, Marcel

PY - 2021/7/15

Y1 - 2021/7/15

N2 - First evidence of a structure in the J/psi Lambda invariant mass distribution is obtained from an amplitude analysis of Xi(-)(b) -> J/psi Lambda K- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere effect. Its mass and width are determined to be 4458.8 +/- 2.9(-1.1)(+4.7) MeV and 17.3 +/- 6.5(-5.7)(+8.0) MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Xi(-) states, Xi(-)(1690) and Xi(-)(1820)(-), are seen for the first time in a Xi(-)(b) decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb(-1), collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV. (c) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

AB - First evidence of a structure in the J/psi Lambda invariant mass distribution is obtained from an amplitude analysis of Xi(-)(b) -> J/psi Lambda K- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere effect. Its mass and width are determined to be 4458.8 +/- 2.9(-1.1)(+4.7) MeV and 17.3 +/- 6.5(-5.7)(+8.0) MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Xi(-) states, Xi(-)(1690) and Xi(-)(1820)(-), are seen for the first time in a Xi(-)(b) decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb(-1), collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV. (c) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

KW - QCD

KW - Exotics

KW - Pentaquark

KW - Spectroscopy

KW - Quarkonium

KW - Particle and resonance production

KW - TOOL

U2 - 10.1016/j.scib.2021.02.030

DO - 10.1016/j.scib.2021.02.030

M3 - Article

SN - 2095-9273

VL - 66

SP - 1278

EP - 1287

JO - Science Bulletin

JF - Science Bulletin

IS - 13

ER -

Evidence of a <i>J</i>/?? structure and observation of excited ?<SUP>-</SUP> states in the ?<i><sub>b</sub></i><SUP>-</SUP> ? <i>J</i>/??<i>K</i><SUP>-</SUP> decay

Abstract

Keywords

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