Publication: First measurement of the |t|-dependence of coherent J/ψ photonuclear production
Дата
2021
Авторы
Acharya, S.
Adamova, D.
Adler, A.
Adolfsson, J.
Belyaev, V.
Bogdanov, A.
Bolozdynya, A.
Borissov, A.
Grigoriev, V.
Kaplin, V.
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Аннотация
© 2021 The Author(s)The first measurement of the cross section for coherent J/ψ photoproduction as a function of |t|, the square of the momentum transferred between the incoming and outgoing target nucleus, is presented. The data were measured with the ALICE detector in ultra-peripheral Pb–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02TeV with the J/ψ produced in the central rapidity region |y|<0.8, which corresponds to the small Bjorken-x range (0.3−1.4)×10−3. The measured |t|-dependence is not described by computations based only on the Pb nuclear form factor, while the photonuclear cross section is better reproduced by models including shadowing according to the leading-twist approximation, or gluon-saturation effects from the impact-parameter dependent Balitsky–Kovchegov equation. These new results are therefore a valid tool to constrain the relevant model parameters and to investigate the transverse gluonic structure at very low Bjorken-x.
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First measurement of the |t|-dependence of coherent J/ψ photonuclear production / Acharya, S. [et al.] // Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - 2021. - 817. - 10.1016/j.physletb.2021.136280
URI
https://www.doi.org/10.1016/j.physletb.2021.136280
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https://openrepository.mephi.ru/handle/123456789/24367
https://www.scopus.com/record/display.uri?eid=2-s2.0-85110507251&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000657652200035
https://openrepository.mephi.ru/handle/123456789/24367