Sirunyan, AM and Tumasyan, A and Adam, W and Ambrogi, F and Choudhury, S and Komaragiri, JR and Panwar, L and Tiwari, PC (2020) Investigation into the event-activity dependence of �(nS) relative production in proton-proton collisions at �s = 7 TeV. In: Journal of High Energy Physics, 2020 (11).
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Abstract
The ratios of the production cross sections between the excited �(2S) and �(3S) mesons and the �(1S) ground state, detected via their decay into two muons, are studied as a function of the number of charged particles in the event. The data are from proton-proton collisions at s = 7 TeV, corresponding to an integrated luminosity of 4.8 fb�1, collected with the CMS detector at the LHC. Evidence of a decrease in these ratios as a function of the particle multiplicity is observed, more pronounced at low transverse momentum pTμμ. For �(nS) mesons with pTμμ> 7 GeV, where most of the data were collected, the correlation with multiplicity is studied as a function of the underlying event transverse sphericity and the number of particles in a cone around the �(nS) direction. The ratios are found to be multiplicity independent for jet-like events. The mean pTμμ values for the �(nS) states as a function of particle multiplicity are also measured and found to grow more steeply as their mass increases. Figure not available: see fulltext. © 2020, The Author(s).
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of High Energy Physics |
| Publisher: | Springer Science and Business Media Deutschland GmbH |
| Additional Information: | Copyright to this article belongs to Springer Science and Business Media Deutschland GmbH |
| Department/Centre: | Division of Physical & Mathematical Sciences > Centre for High Energy Physics |
| Date Deposited: | 12 Feb 2021 09:00 |
| Last Modified: | 12 Feb 2021 09:00 |
| URI: | http://eprints.iisc.ac.in/id/eprint/67902 |
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