Search for exclusive photoproduction of Z$_c^{\pm}$(3900) at COMPASS

C Adolph,R Akhunzyanov,M Alexeev,G D Alexeev,A Amoroso,V Andrieux,V Anosov,A Austregesilo,B Badelek,F Balestra,J Barth,Gunter Baum,R Beck,Y Bedfer,A Berlin,Jennifer T Bernhard,K Bicker,E R Bielert,J Bieling,R Birsa,J Bisplinghoff,Martin Bodlak,M Boer,P Bordalo,F Bradamante,C Braun,A Bressan,M Buechele,E Burtin,L Capozza,M Chiosso,S U Chung,A Cicuttin,M L Crespo,Q Curiel,S Dalla Torre,S S Dasgupta,O Yu Denisov,S V Donskov,N Doshita,V Duic,W Duennweber,M Dziewiecki,A Efremov,C Elia,P D Eversheim,W Eyrich,M A Faessler,A M Ferrero,A P Filin,M Finger,H M Fischer, Carlos Jaime Velasquez Franco,N Du Fresne Von Hohenesche,J M Friedrich,V V Frolov,F Gautheron,O P Gavrichtchouk,S G Gerassimov,R Geyer,I Gnesi,B Gobbo,S Goertz,M Gorzellik,S Grabmueller,A Grasso,B Grube,T Grussenmeyer,A Guskov,F Haas,D Von Harrach,D Hahne,R Hashimoto,F H Heinsius,F Herrmann,F Hinterberger,Ch Hoeppner,N Horikawa,N Dhose,S Huber,S Ishimoto,Andrew Ivanov,Yu I Ivanshin,T Iwata,R Jahn,V Jary,P Jasinski,P Joerg,R Joosten,E M Kabuss,B Ketzer,G V Khaustov,Yu A Khokhlov,Yu Kisselev,F J Klein,K Klimaszewski,J H Koivuniemi,V N Kolosov,K Kondo,K Koenigsmann,I Konorov,V F Konstantinov,A M Kotzinian,O Kouznetsov,M Kraemer,Z V Kroumchtein,N Kuchinski,F Kunne,K Kurek,R Kurjata,A A Lednev,A Lehmann,M Levillain,S Levorato,J Lichtenstadt,A Maggiora,A Magnon,N Makke,G K Mallot,C Marchand,A Martin,J Marzec,J Matousek,Hideo Matsuda,T Matsuda,G Meshcheryakov,W T Meyer,T Michigami,Yu V Mikhailov,Y Miyachi,A Nagaytsev,T Nagel,F Nerling,S Neubert,D Neyret,V Nikolaenko,J Novy,W D Nowak,A S Nunes,A G Olshevsky,I Orlov,M Ostrick,R Panknin,D Panzieri,B Parsamyan,S Paul,D V Peshekhonov,S Platchkov,J Pochodzalla,V A Polyakov,J Pretz,M Quaresma,C Quintans,S Ramos,C Regali,G Reicherz,E Rocco,N S Rossiyskaya,D I Ryabchikov,Anna M Rychter,V D Samoylenko,A Sandacz,S Sarkar,I Savin,G Sbrizzai,P Schiavon,C Schill,T Schlueter,K Schmidt,H Schmieden,K Schoenning,S Schopferer,M Schott,O Yu Shevchenko,L Silva,L Sinha,S Sirtl,M Slunecka,S Sosio,F Sozzi,A Srnka,L Steiger,M Stolarski,M Sulc,R Sulej,Hiroyuki Suzuki,A Szabelski,T Szameitat,P Sznajder,S Takekawa,J Ter Wolbeek,S Tessaro,F Tessarotto,F Thibaud,S Uhl,I Uman,M Virius, Lipeng Wang,T Weisrock,M Wilfert,R Windmolders,H Wollny,K Zaremba,M Zavertyaev,E Zemlyanichkina,M Ziembicki,A Zink

Physics Letters B（2015）

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摘要

A search for the exclusive production of the Zc±(3900) hadron by virtual photons has been performed in the channel Zc±(3900)→J/ψπ±. The data cover the range from 7 GeV to 19 GeV in the centre-of-mass energy of the photon–nucleon system. The full set of the COMPASS data set collected with a muon beam between 2002 and 2011 has been used. An upper limit for the ratio BR(Zc±(3900)→J/ψπ±)×σγN→Zc±(3900)N/σγN→J/ψN of 3.7×10−3 has been established at the confidence level of 90%.

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关键词

COMPASS,Zc(3900),Photoproduction,Tetraquark

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