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

Chair of Physics I

INFN- Sezione di Trieste
Friedrich Alexander Universität Erlangen-Nürnberg
University of Torino
INFN Sez. di Torino
University Paris-Sud
University of Illinois at Urbana-Champaign
Czech Technical University in Prague
National Center for Nuclear Research (NCBJ)
Technical University of Munich
University of Aveiro
University of Warsaw
University of Bonn
European Organization for Nuclear Research
Johannes Gutenberg University
Charles University
LIP - Lisboa
Instituto Superior Técnico
University of Trieste Via A
University of Freiburg
Polytechnic University of Tomsk
Academia Sinica Taipei
Matrivani Institute of Experimental Research & Education
Pusan National University
ICTP
Institute for High Energy Physics (IHEP)
Yamagata University
Warsaw Institute of Technology
Max-Planck-lnstitut für Kohlenforschung
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
Nagoya University
Chubu University
National Central University
High Energy Accelerator Research Organization (KEK)
Moscow Institute of Physics and Technology
National Kaohsiung Normal University
Tel Aviv University
University of Tübingen
University of Miyazaki
University of Eastern Piedmont
RWTH Aachen University
Uppsala University
Institute of Scientific Instruments of the Academy of Sciences of the Czech Republic
Technical University of Liberec

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

28 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 B
Volume	783
DOIs	https://doi.org/10.1016/j.physletb.2018.07.008
State	Published - 10 Aug 2018

Keywords

COMPASS
Exotic charmonia
Photoproduction
Tetraquark
X(3872)

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10.1016/j.physletb.2018.07.008

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@article{1196d777f257490aaeb2661626a3c762,

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 S. Paul",

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

year = "2018",

month = aug,

day = "10",

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

language = "English",

volume = "783",

pages = "334--340",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

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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 - Paul, S.

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 - Article

AN - SCOPUS:85049905172

SN - 0370-2693

VL - 783

SP - 334

EP - 340

JO - Physics Letters B

JF - Physics Letters B

ER -

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

Abstract

Keywords

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