Speaker
Description
We investigate the suppression of ϒ mesons in the hot quark–gluon plasma (QGP) created in Pb+Pb collisions at energies available at the CERN Large Hadron Collider using a centrality- and transverse-momentum-dependent model that encompasses screening, collisional damping, and gluodissociation in the QGP. For ϒ(1S), the model prediction is compatible with experimental data from the CMS collaboration whereas it cannot explain the ϒ(2S) yields observed in peripheral collisions.
To improve the description of peripheral collisions, an estimate of the electromagnetic field strength experienced by ϒ mesons embedded in the expanding QGP and its consequences on ϒ dissociation is made. Our results, however, point at a relative insignificance of these electromagnetic field effects compared to the established strong-interaction suppression mechanisms.
References:
[1] J. Hoelck, G. Wolschin, Eur. Phys. J. A 53, 241 (2017).
[2] J. Hoelck, F. Nendzig, G. Wolschin, Phys. Rev. C 95, 024905 (2017).
[3] V. Khachatryan et al. (CMS Collaboration), Phys. Lett. B 770, 357 (2017); CERN-EP-2016-248.
[4] A. M. Sirunyan et al. (CMS Collaboration), Phys. Lett. B (submitted); CERN-EP-2018-110.
