Publication: Observation of the Radiative Decays of Upsilon(1S) to chi(c1)
Дата
2020
Авторы
Katrenko, P.
Adachi, I.
Aihara, H.
Al Said, S.
Pakhlov, P.
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Аннотация
We report the first observation of the radiative decay of the Upsilon(1S) into a charmonium state. The significance of the observed signal of Upsilon(1S) -> gamma chi(c1) is 6.3 standard deviations including systematics. The branching fraction is calculated to be B[Upsilon(1S) -> gamma chi(c1)] = [4.7(-1.8)(+2.4) (stat)(-0.5)(+0.4) (sys) x 10(-5)]. We also searched for Upsilon(1S) radiative decays into chi(c0.2) and eta(c)(1S, 2S), and set upper limits on their branching fractions. These results are obtained from a 24.9 fb(-1) data sample collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider at a center-of-mass energy equal to the Upsilon(2S) mass using Upsilon(1S) tagging by the Upsilon(2S) -> Upsilon(1S)pi(+)pi(-) transitions.
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Цитирование
Observation of the Radiative Decays of Upsilon(1S) to chi(c1) / Katrenko, P [et al.] // Physical Review Letters. - 2020. - 124. - № 12. - 10.1103/PhysRevLett.124.122001
URI
https://www.doi.org/10.1103/PhysRevLett.124.122001
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https://www.scopus.com/record/display.uri?eid=2-s2.0-85083545972&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000522195100004
https://openrepository.mephi.ru/handle/123456789/20532