Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)

COMPASS Collaboration

doi:10.1016/j.physletb.2018.07.008

Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)

COMPASS Collaboration

School of Physics and Astronomy

National Institute for Nuclear Physics
Friedrich-Alexander University Erlangen-Nürnberg
University of Turin
Université Paris-Saclay
University of Illinois at Urbana-Champaign
Czech Technical University in Prague
National Centre for Nuclear Research
Technical University of Munich
University of Aveiro
University of Warsaw
University of Bonn
CERN
Johannes Gutenberg University Mainz
Charles University
Laboratório de Instrumentação e Física Experimental de Partículas
University of Lisbon
University of Trieste
University of Freiburg
Tomsk Polytechnic University
Academia Sinica - Institute of Physics
Matrivani Institute of Experimental Research & Education
Pusan National University
Abdus Salam International Centre for Theoretical Physics
Institute for High Energy Physics
Yamagata University
Warsaw University of Technology
Ruhr University Bochum
RAS - P.N. Lebedev Physics Institute
Nagoya University
Chubu University
National Central University
High Energy Accelerator Research Organization, Tsukuba
Moscow Institute of Physics and Technology
National Kaohsiung Normal University
University of Tübingen
University of Miyazaki
University of Eastern Piedmont
RWTH Aachen University
Uppsala University
Czech Academy of Sciences
Technical University of Liberec

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

29 Scopus citations

Abstract

We have searched for exclusive production of exotic charmonia in the reaction μ⁺N→μ⁺(J/ψπ⁺π⁻)π^±N^′ using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/ψπ⁺π⁻ mass distribution we observe a signal with a statistical significance of 4.1 σ. Its mass and width are consistent with those of the X(3872). The shape of the π⁺π⁻ mass distribution from the observed decay into J/ψπ⁺π⁻ shows disagreement with previous observations for X(3872). The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of X(3872) with C=−1 predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into J/ψπ⁺π⁻ is determined to be 71±28(stat)±39(syst) pb.

Original language	English
Pages (from-to)	334-340
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	783
DOIs	https://doi.org/10.1016/j.physletb.2018.07.008
State	Published - 10 Aug 2018

Funding

Funders	Funder number
Israel Academy of Sciences and Humanities
Center for Scientific Review
Japan Society for the Promotion of Science
Ministry of Science and Technology, Taiwan
European Commission
Bundesministerium für Bildung und Frauen
California Department of Fish and Wildlife
Seventh Framework Programme	1506416, 283286
Ministry of Education, Culture, Sports, Science and Technology
National Science Foundation	1506416, 1812377
Fundação para a Ciência e a Tecnologia	CERN/FIS-NUC/0017/2015
Fundació Catalana de Trasplantament	123600/2011, 116376/2010
Ministry of Education, Youth and Science	LG13031
Narodowym Centrum Nauki	2017/26/M/ST2/00498

Keywords

COMPASS
Exotic charmonia
Photoproduction
Tetraquark
X(3872)

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10.1016/j.physletb.2018.07.008

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@article{26244155e5a94b06af66a97478d9f4e1,

title = "Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)",

abstract = "We have searched for exclusive production of exotic charmonia in the reaction μ+N→μ+(J/ψπ+π−)π±N′ using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/ψπ+π− mass distribution we observe a signal with a statistical significance of 4.1 σ. Its mass and width are consistent with those of the X(3872). The shape of the π+π− mass distribution from the observed decay into J/ψπ+π− shows disagreement with previous observations for X(3872). The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of X(3872) with C=−1 predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into J/ψπ+π− is determined to be 71±28(stat)±39(syst) pb.",

keywords = "COMPASS, Exotic charmonia, Photoproduction, Tetraquark, X(3872)",

author = "\{COMPASS Collaboration\} and M. Aghasyan and R. Akhunzyanov and Alexeev, \{M. G.\} and Alexeev, \{G. D.\} and A. Amoroso and V. Andrieux and Anfimov, \{N. V.\} and V. Anosov and A. Antoshkin and K. Augsten and W. Augustyniak and A. Austregesilo and Azevedo, \{C. D.R.\} and B. Bade{\l}ek and F. Balestra and M. Ball and J. Barth and R. Beck and Y. Bedfer and J. Bernhard and K. Bicker and Bielert, \{E. R.\} and R. Birsa and M. Bodlak and P. Bordalo and F. Bradamante and A. Bressan and M. B{\"u}chele and Burtsev, \{V. E.\} and Chang, \{W. C.\} and C. Chatterjee and M. Chiosso and I. Choi and Chumakov, \{A. G.\} and Chung, \{S. U.\} and A. Cicuttin and Crespo, \{M. L.\} and \{Dalla Torre\}, S. and Dasgupta, \{S. S.\} and S. Dasgupta and Denisov, \{O. Yu\} and L. Dhara and Donskov, \{S. V.\} and N. Doshita and Ch Dreisbach and W. D{\"u}nnweber and Dusaev, \{R. R.\} and M. Dziewiecki and A. Efremov and J. Lichtenstadt",

note = "Publisher Copyright: {\textcopyright} 2018 The Author",

year = "2018",

month = aug,

day = "10",

doi = "10.1016/j.physletb.2018.07.008",

language = "אנגלית",

volume = "783",

pages = "334--340",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)

AU - COMPASS Collaboration

AU - Aghasyan, M.

AU - Akhunzyanov, R.

AU - Alexeev, M. G.

AU - Alexeev, G. D.

AU - Amoroso, A.

AU - Andrieux, V.

AU - Anfimov, N. V.

AU - Anosov, V.

AU - Antoshkin, A.

AU - Augsten, K.

AU - Augustyniak, W.

AU - Austregesilo, A.

AU - Azevedo, C. D.R.

AU - Badełek, B.

AU - Balestra, F.

AU - Ball, M.

AU - Barth, J.

AU - Beck, R.

AU - Bedfer, Y.

AU - Bernhard, J.

AU - Bicker, K.

AU - Bielert, E. R.

AU - Birsa, R.

AU - Bodlak, M.

AU - Bordalo, P.

AU - Bradamante, F.

AU - Bressan, A.

AU - Büchele, M.

AU - Burtsev, V. E.

AU - Chang, W. C.

AU - Chatterjee, C.

AU - Chiosso, M.

AU - Choi, I.

AU - Chumakov, A. G.

AU - Chung, S. U.

AU - Cicuttin, A.

AU - Crespo, M. L.

AU - Dalla Torre, S.

AU - Dasgupta, S. S.

AU - Dasgupta, S.

AU - Denisov, O. Yu

AU - Dhara, L.

AU - Donskov, S. V.

AU - Doshita, N.

AU - Dreisbach, Ch

AU - Dünnweber, W.

AU - Dusaev, R. R.

AU - Dziewiecki, M.

AU - Efremov, A.

AU - Lichtenstadt, J.

PY - 2018/8/10

Y1 - 2018/8/10

N2 - We have searched for exclusive production of exotic charmonia in the reaction μ+N→μ+(J/ψπ+π−)π±N′ using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/ψπ+π− mass distribution we observe a signal with a statistical significance of 4.1 σ. Its mass and width are consistent with those of the X(3872). The shape of the π+π− mass distribution from the observed decay into J/ψπ+π− shows disagreement with previous observations for X(3872). The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of X(3872) with C=−1 predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into J/ψπ+π− is determined to be 71±28(stat)±39(syst) pb.

AB - We have searched for exclusive production of exotic charmonia in the reaction μ+N→μ+(J/ψπ+π−)π±N′ using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/ψπ+π− mass distribution we observe a signal with a statistical significance of 4.1 σ. Its mass and width are consistent with those of the X(3872). The shape of the π+π− mass distribution from the observed decay into J/ψπ+π− shows disagreement with previous observations for X(3872). The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of X(3872) with C=−1 predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into J/ψπ+π− is determined to be 71±28(stat)±39(syst) pb.

KW - COMPASS

KW - Exotic charmonia

KW - Photoproduction

KW - Tetraquark

KW - X(3872)

UR - https://www.scopus.com/pages/publications/85049905172

U2 - 10.1016/j.physletb.2018.07.008

DO - 10.1016/j.physletb.2018.07.008

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:85049905172

SN - 0370-2693

VL - 783

SP - 334

EP - 340

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)

Abstract

Funding

Keywords

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