Details

Autor(en) / Beteiligte

• Akhunzyanov, R.
• Amoroso, A.
• Anfimov, N.V.
• Augsten, K.
• Augustyniak, W.
• Austregesilo, A.
• Balestra, F.
• Ball, M.
• Barth, J.
• Bedfer, Y.
• Bernhard, J.
• Bicker, K.
• Birsa, R.
• Bodlak, M.
• Bordalo, P.
• Chang, W.-C.
• Chiosso, M.
• Choi, I.
• Cicuttin, A.
• Denisov, O.Yu
• Dhara, L.
• Dünnweber, W.
• Dusaev, R.R.
• Efremov, A.
• Finger, M.
• Fuchey, E.
• Gautheron, F.
• Gerassimov, S.
• Giordano, F.
• Gnesi, I.
• Grasso, A.
• Gridin, A.
• Grube, B.
• Guskov, A.
• Herrmann, F.
• Hsieh, C.-Y.
• Ishimoto, S.
• Kerbizi, A.
• Ketzer, B.
• Khaustov, G.V.
• Kisselev, Yu
• Koivuniemi, J.H.
• Kondo, K.
• Königsmann, K.
• Kotzinian, A.M.
• Kremser, P.
• Kroumchtein, Z.V.
• Kunne, F.
• Lednev, A.A.
• Levchenko, E.A.
• Levorato, S.
• Lian, Y.-S.
• Lichtenstadt, J.
• Magnon, A.
• Makke, N.
• Mallot, G.K.
• Marzec, J.
• Matsuda, T.
• Meshcheryakov, G.V.
• Meyer, W.
• Mikhailov, Yu.V.
• Nerling, F.
• Neyret, D.
• Nový, J.
• Nowak, W.-D.
• Nunes, A.S.
• Panzieri, D.
• Pereira, F.
• Pešek, M.
• Polyakov, V.A.
• Pretz, J.
• Quintans, C.
• Regali, C.
• Reicherz, G.
• Riedl, C.
• Rogacheva, N.S.
• Ryabchikov, D.I.
• Rybnikov, A.
• Salac, R.
• Samoylenko, V.D.
• Sandacz, A.
• Santos, C.
• Schönning, K.
• Seder, E.
• Sinha, L.
• Slunecka, M.
• Srnka, A.
• Subrt, O.
• Sulc, M.
• Sznajder, P.
• Tasevsky, M.
• Tomsa, J.
• Tosello, F.
• Tskhay, V.
• Virius, M.
• Wallner, S.
• ter Wolbeek, J.
• Zavada, P.
• Zemlyanichkina, E.

Titel

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

Ist Teil von

• Physics letters. B, 2018-08, Vol.783, p.334-340

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.