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

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

doi:10.1016/j.physletb.2018.07.008

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

Titolo:	Search for muoproduction of X (3872) at COMPASS and indication of a new state X˜(3872)
Autori:	Aghasyan, M. Akhunzyanov, R. Alexeev, M. G. Alexeev, G. D. Amoroso, A. Andrieux, V. Anfimov, N. V. Anosov, V. Antoshkin, A. Augsten, K. Augustyniak, W. Austregesilo, A. Azevedo, C. D. R. Badełek, B. Balestra, F. Ball, M. Barth, J. Beck, R. Bedfer, Y. Bernhard, J. Bicker, K. Bielert, E. R. BIRSA, RENATO Bodlak, M. Bordalo, P. BRADAMANTE, FRANCO BRESSAN, Andrea Büchele, M. Burtsev, V. E. Chang, W. -C. CHATTERJEE, CHANDRADOY Chiosso, M. Choi, I. Chumakov, A. G. Chung, S. -U. Cicuttin, A. Crespo, M. L. DALLA TORRE, SILVIA DASGUPTA, SHUDDHA SHANKAR DASGUPTA, SHUDDHA SHANKAR Denisov, O. Yu. Dhara, L. Donskov, S. V. Doshita, N. Dreisbach, Ch. Dünnweber, W. Dusaev, R. R. Dziewiecki, M. Efremov, A. Eversheim, P. D. Faessler, M. Ferrero, A. Finger, M. Finger, M. Fischer, H. Franco, C. du Fresne von Hohenesche, N. Friedrich, J. M. Frolov, V. Fuchey, E. Gautheron, F. Gavrichtchouk, O. P. Gerassimov, S. Giarra, J. Giordano, F. Gnesi, I. Gorzellik, M. Grasso, A. Gridin, A. Grosse Perdekamp, M. Grube, B. Grussenmeyer, T. Guskov, A. Hahne, D. Hamar, G. von Harrach, D. Heinsius, F. H. Heitz, R. Herrmann, F. Horikawa, N. d'Hose, N. Hsieh, C. -Y. HUBER, STEFANIE Ishimoto, S. IVANOV, ANNA Ivanshin, Yu. Iwata, T. Jary, V. Joosten, R. Jörg, P. Kabuß, E. KERBIZI, ALBI Ketzer, B. Khaustov, G. V. Khokhlov, Yu. A. Kisselev, Yu. Klein, F. Koivuniemi, J. H. Kolosov, V. N. Kondo, K. Königsmann, K. Konorov, I. Konstantinov, V. F. Kotzinian, A. M. Kouznetsov, O. M. Kral, Z. Krämer, M. Kremser, P. Krinner, F. Kroumchtein, Z. V. Kulinich, Y. Kunne, F. Kurek, K. Kurjata, R. P. Kuznetsov, I. I. Kveton, A. Lednev, A. A. Levchenko, E. A. Levillain, M. LEVORATO, STEFANO Lian, Y. -S. Lichtenstadt, J. Longo, R. Lyubovitskij, V. E. MAGGIORA, ALESSANDRA Magnon, A. Makins, N. Makke, Nour Mallot, G. K. Mamon, S. A. Marianski, B. MARTIN, ANNA Marzec, J. MATOUSEK, JAN Matsuda, H. Matsuda, T. Meshcheryakov, G. V. Meyer, M. Meyer, W. Mikhailov, Yu. V. Mikhasenko, M. Mitrofanov, E. Mitrofanov, N. Miyachi, Y. Nagaytsev, A. Nerling, F. Neyret, D. Nový, J. Nowak, W. -D. Nukazuka, G. Nunes, A. S. Olshevsky, A. G. Orlov, I. Ostrick, M. Panzieri, D. Parsamyan, B. Paul, S. Peng, J. -C. PEREIRA GONCALVES, MARIA FILOMENA Pešek, M. Pešková, M. Peshekhonov, D. V. Pierre, N. Platchkov, S. Pochodzalla, J. Polyakov, V. A. Pretz, J. Quaresma, M. Quintans, C. TARAZONA RAMOS, RICARDO STEFANO Regali, C. Reicherz, G. Riedl, C. Rogacheva, N. S. Ryabchikov, D. I. Rybnikov, A. Rychter, A. Salac, R. Samoylenko, V. D. Sandacz, A. SANTOS, RODRIGO GONÇALVES COSTA Sarkar, S. Savin, I. A. Sawada, T. SBRIZZAI, GIULIO SCHIAVON, PAOLO Schmidt, K. Schmieden, H. Schönning, K. Seder, E. Selyunin, A. Silva, L. Sinha, L. Sirtl, S. Slunecka, M. Smolik, J. Srnka, A. Steffen, D. Stolarski, M. Subrt, O. Sulc, M. Suzuki, H. SZABELSKI, ADAM Szameitat, T. Sznajder, P. Tasevsky, M. TESSARO, SUSANNA TESSAROTTO, FULVIO Thiel, A. Tomsa, J. Tosello, F. Tskhay, V. Uhl, S. Vasilishin, B. I. Vauth, A. Veloso, J. Vidon, A. Virius, M. Wallner, S. Weisrock, T. Wilfert, M. ter Wolbeek, J. Zaremba, K. Zavada, P. Zavertyaev, M. Zemlyanichkina, E. Zhuravlev, N. Ziembicki, M. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2018
Stato di pubblicazione:	Pubblicato
Rivista:	PHYSICS LETTERS. SECTION B
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
Handle:	http://hdl.handle.net/11368/2927771
Digital Object Identifier (DOI):	http://dx.doi.org/10.1016/j.physletb.2018.07.008
URL:	https://www.sciencedirect.com/science/article/pii/S037026931830546X
Appare nelle tipologie:	1.1 Articolo in Rivista

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