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

6533b7d1fe1ef96bd125caf3

RESEARCH PRODUCT

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

L. Silva L. Silva S.s. Dasgupta S.s. Dasgupta A.g. Chumakov A.g. Chumakov J. Nový J. Nový J. Nový Y. Miyachi Y. Miyachi P.d. Eversheim P.d. Eversheim P. Zavada P. Zavada E. Zemlyanichkina E. Zemlyanichkina François Herrmann François Herrmann S. Uhl S. Uhl Y. Bedfer Y. Bedfer A. Antoshkin A. Antoshkin G. Sbrizzai G. Sbrizzai N.s. Rogacheva N.s. Rogacheva A. Ferrero A. Ferrero G.v. Khaustov G.v. Khaustov A. Magnon A. Magnon F. Pereira F. Pereira I. Konorov I. Konorov I. Konorov J. Ter Wolbeek J. Ter Wolbeek Maria Liz Crespo C. Regali C. Regali J. Marzec J. Marzec A. Kveton A. Kveton G.d. Alexeev G.d. Alexeev K. Schmidt K. Schmidt P. Kremser P. Kremser O.yu. Denisov F. Gautheron F. Gautheron F. Nerling F. Nerling Yu.a. Khokhlov Yu.a. Khokhlov K. Kondo K. Kondo N. C. R. Makins N. C. R. Makins M. Faessler V.n. Kolosov V.n. Kolosov A. Amoroso A. Amoroso H. Matsuda H. Matsuda D. Neyret D. Neyret C.d.r. Azevedo C.d.r. Azevedo V. Jary V. Jary V. Anosov V. Anosov M. Grosse Perdekamp M. Grosse Perdekamp S. Sarkar S. Sarkar Y.-s. Lian Y.-s. Lian R. Beck R. Beck A. Selyunin A. Selyunin B. Grube B. Grube M. Stolarski M. Stolarski M. Tasevsky M. Tasevsky T. Sawada T. Sawada N. Horikawa N. Horikawa M. Sulc S. Tessaro D. Hahne D. Hahne V.d. Samoylenko V.d. Samoylenko J. Giarra J. Giarra N. D'hose N. D'hose W. Meyer W. Meyer R. Joosten R. Joosten Andres Cicuttin O. Subrt O. Subrt O. Subrt S. Wallner S. Wallner S. Platchkov S. Platchkov R. Salac R. Salac Jen-chieh Peng Jen-chieh Peng V.a. Polyakov V.a. Polyakov J. Veloso J. Veloso N. Zhuravlev N. Zhuravlev G.v. Meshcheryakov G.v. Meshcheryakov A. Sandacz M. Virius M. Virius F. H. Heinsius F. H. Heinsius S. Ishimoto S. Ishimoto M. Aghasyan A.m. Kotzinian A.m. Kotzinian M. Zavertyaev M. Zavertyaev Jan Matousek Jan Matousek Jan Matousek G. Reicherz G. Reicherz S. Dalla Torre C. Quintans C. Quintans M. Pešek M. Pešek J. Barth J. Barth Alan D. Martin Alan D. Martin M. Chiosso M. Chiosso N.v. Anfimov N.v. Anfimov Jan Tomsa Jan Tomsa M. Ostrick M. Ostrick R.p. Kurjata R.p. Kurjata M. Finger M. Finger E. Kabuß E. Kabuß R.r. Dusaev R.r. Dusaev A.s. Nunes A.s. Nunes T. Weisrock T. Weisrock R. Birsa K. Augsten K. Augsten K. Augsten V. Frolov V. Frolov V. Frolov A. Maggiora A. Vauth A. Vauth A.a. Lednev A.a. Lednev V.e. Lyubovitskij V.e. Lyubovitskij C. Chatterjee C. Chatterjee P. Jörg P. Jörg Yakov Petrovich Kulinich Yakov Petrovich Kulinich Gerhard K. Mallot Gerhard K. Mallot Andrey Ivanov Andrey Ivanov Frank Klein Frank Klein P. Bordalo P. Bordalo A. Nagaytsev A. Nagaytsev Johannes Bernhard Johannes Bernhard Johannes Bernhard Ch. Dreisbach Ch. Dreisbach D. Panzieri K. Zaremba K. Zaremba E.r. Bielert E.r. Bielert Markus F. Krämer Markus F. Krämer J. Pochodzalla J. Pochodzalla K. Königsmann K. Königsmann M. Slunecka M. Slunecka A. Guskov A. Guskov J.m. Friedrich J.m. Friedrich A. Srnka H. Suzuki H. Suzuki S. Dasgupta S. Dasgupta B. Marianski T. Grussenmeyer T. Grussenmeyer A. Rybnikov A. Rybnikov Andrea Bressan Andrea Bressan Anatoli Vasilievich Efremov Anatoli Vasilievich Efremov L. Dhara L. Dhara T. Matsuda T. Matsuda M. Meyer M. Meyer M. Meyer M. Dziewiecki M. Dziewiecki Markus Ball Markus Ball M. Gorzellik M. Gorzellik W.-d. Nowak W.-d. Nowak Yu. Kisselev Yu. Kisselev P. Schiavon P. Schiavon C. Santos E. Mitrofanov E. Mitrofanov Bakur Parsamyan Bakur Parsamyan W. Dünnweber Martin Bodlak Martin Bodlak Yu. Ivanshin Yu. Ivanshin M.g. Alexeev M.g. Alexeev Ilya Kuznetsov Ilya Kuznetsov W. C. Chang W. C. Chang S.v. Donskov S.v. Donskov D. Steffen D. Steffen D. Steffen M. Wilfert M. Wilfert J. Smolik J. Smolik K. Bicker K. Bicker K. Bicker S. Ramos S. Ramos L. Sinha L. Sinha J. Pretz J. Pretz E. Fuchey E. Fuchey S. Levorato A. Austregesilo A. Austregesilo A. Gridin A. Gridin I. J. Choi I. J. Choi N. Mitrofanov N. Mitrofanov C. Franco C. Franco Stephan M. Paul Stephan M. Paul M. Levillain M. Levillain A. Thiel A. Thiel C. Riedl C. Riedl V. Andrieux V. Andrieux V. Andrieux Mikhail Mikhasenko Mikhail Mikhasenko F. Krinner F. Krinner I.a. Savin I.a. Savin O.p. Gavrichtchouk O.p. Gavrichtchouk N. Makke I. Orlov I. Orlov A. Szabelski A. Szabelski F. Giordano F. Giordano E.a. Levchenko E.a. Levchenko N. Du Fresne Von Hohenesche N. Du Fresne Von Hohenesche N. Du Fresne Von Hohenesche S. Gerassimov S. Gerassimov S. Gerassimov N. Pierre N. Pierre N. Pierre R. Longo R. Longo M. Quaresma M. Quaresma N. Doshita N. Doshita B. Ketzer B. Ketzer A. Vidon A. Vidon Yu.v. Mikhailov Yu.v. Mikhailov I. Gnesi I. Gnesi G. Hamar V.f. Konstantinov V.f. Konstantinov P. Sznajder Z. Kral Z. Kral T. Iwata T. Iwata B.i. Vasilishin B.i. Vasilishin A. Grasso A. Grasso V. Tskhay V. Tskhay H. Fischer H. Fischer M. Ziembicki M. Ziembicki M. Büchele M. Büchele A. Rychter A. Rychter S. Sirtl S. Sirtl Z.v. Kroumchtein Z.v. Kroumchtein F. Balestra F. Balestra S.-u. Chung S.-u. Chung F. Tosello T. Szameitat T. Szameitat D. Von Harrach D. Von Harrach K. Schönning K. Schönning F. Tessarotto J.h. Koivuniemi J.h. Koivuniemi J.h. Koivuniemi Franco Bradamante Franco Bradamante A. Kerbizi A. Kerbizi J. Lichtenstadt J. Lichtenstadt F. Kunne F. Kunne M. Pešková M. Pešková E. Seder E. Seder K. Kurek G. Nukazuka G. Nukazuka D.v. Peshekhonov D.v. Peshekhonov R. Heitz R. Heitz O.m. Kouznetsov O.m. Kouznetsov V.e. Burtsev V.e. Burtsev R. Akhunzyanov R. Akhunzyanov S.a. Mamon S.a. Mamon H. Schmieden H. Schmieden C.-y. Hsieh C.-y. Hsieh B. Badełek B. Badełek W. Augustyniak D.i. Ryabchikov D.i. Ryabchikov D.i. Ryabchikov A.g. Olshevsky A.g. Olshevsky S. Huber S. Huber

subject

Physics Nuclear and High Energy Physics Muon Mass distribution 010308 nuclear & particles physics Branching fraction Hadron State (functional analysis)01 natural sciences Momentum 0103 physical sciences Tetraquark Atomic physics 010306 general physics X(3872)

description

Abstract We have searched for exclusive production of exotic charmonia in the reaction μ + N → μ + ( J / ψ π + π − ) π ± N ′ using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J / ψ π + 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 / ψ π + 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 / ψ π + π − is determined to be 71±28(stat)±39(syst) pb.

year	journal	country	edition	language
2018-08-01	Physics Letters B

https://doi.org/10.1016/j.physletb.2018.07.008