Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)
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| Заглавие |
Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)
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| Автор |
Aghasyan, Mher
Akhunzyanov, R. R. Burtsev, Vitaly Evgenjevich Chumakov, Aleksandr Grigorjevich Dusaev, Renat Ramilyevich Levchenko, Evgeny Anatolievich Lyubovitskiy (Lyubovitskij), Valery Efimovich Mamon, Sergey Aleksandrovich Vasilishin, Bogdan Ivanovich |
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| Тематика |
X (3872)
photoproduction tetraquark exotic charmonia фотопродукция тетракварки чармоний |
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| Описание |
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.
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| Дата |
2020-01-23T09:34:50Z
2020-01-23T09:34:50Z 2018 |
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| Тип |
Article
Published version (info:eu-repo/semantics/publishedVersion) Journal article (info:eu-repo/semantics/article) |
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| Идентификатор |
Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872) / M. Aghasyan [et al.] // Physics Letters B. — 2018. — Vol. 783. — [P. 334-340].
http://earchive.tpu.ru/handle/11683/57550 10.1016/j.physletb.2018.07.008 |
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| Язык |
en
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| Права |
Open access (info:eu-repo/semantics/openAccess)
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application/pdf
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| Издатель |
Томский политехнический университет
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| Источник |
Physics Letters B
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