Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872); Physics Letters B; Vol. 783

Bibliographische Detailangaben
Parent link:Physics Letters B
Vol. 783.— 2018.— P. 334-340
Weitere Verfasser: Aghasyan M. Mher, Akhunzyanov Ruslan R. R., Burtsev V. E. Vitaly Evgenjevich, Chumakov A. G. Aleksandr Grigorjevich, Dusaev R. R. Renat Ramilyevich, Levchenko E. A. Evgeny Anatolievich, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich, Mamon S. A. Sergey Aleksandrovich, Vasilishin B. I. Bogdan Ivanovich
Zusammenfassung:Title screen
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.
Sprache:Englisch
Veröffentlicht: 2018
Schlagworte:
Online-Zugang:http://earchive.tpu.ru/handle/11683/57550
https://doi.org/10.1016/j.physletb.2018.07.008
Format: Elektronisch Buchkapitel
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=660172