Search for muoproduction of $X (3872)$ at COMPASS and indication of a new state $\widetilde{X}(3872)$ - INSPIRE

DataBETA

Search for muoproduction of $X (3872)$ at COMPASS and indication of a new state $\widetilde{X}(3872)$

COMPASS

Collaboration

•

M. Aghasyan
(
- INFN, Trieste
)

Jul 6, 2017

7 pages

Published in:

Phys.Lett.B 783 (2018) 334-340

Published: Aug 10, 2018

e-Print:

1707.01796 [hep-ex]

DOI:

10.1016/j.physletb.2018.07.008

PDG:

{{\mathit \chi}_{{{c1}}}{(3872)}}

{{\mathit J / \psi}}{{\mathit X}}

Report number:

CERN-EP-2017-165

Experiments:

CERN-SPS-NA58

View in:

reference search37 citations

Citations per year

Abstract: (Elsevier)

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.

Note:

12 pages, 6 figures

COMPASS
X(3872)
Photoproduction
Tetraquark
Exotic charmonia
muon+ nucleus: scattering
muon nucleus: exclusive reaction
mass spectrum: two-pion
X(3872): leptoproduction
X(3872): hadronic decay

References(46)

Figures(9)

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