Vesentini, Alberto (2012) Observation and study of the X(3872) particle with the CMS experiment at LHC. Il nuovo cimento C, 35 (5). pp. 21-29. ISSN 1826-9885
|
Text
ncc10341.pdf - Published Version Download (344kB) | Preview |
Abstract
The discovery of the X(3872) resonance in the decay channel J/ψπ+π− by the Belle Collaboration in 2003 opened up a new chapter in the QCD landscape. The properties of the X(3872) are not in agreement with being a charmonium state. Different interpretations are still under study: one possibility is that the particle is a molecule of D∗ mesons, another one is that it is a hybrid of bound states and another one is that it is a tetra-quark state. We report the study of the X(3872) particle in the CMS experiment, at LHC, with 2010 data and a first view at 2011 data. The observed decay channel is that one into a J/ψ (reconstructed with an opposite sign muons pair) and an opposite sign pions pair (π+π−). The CMS experiment, one of the two general purpose experiments in the LHC collider, has an impressive performance in the tracks and muons detection and reconstruction due to its superior detectors performances. We show the measurement procedure of the production cross-section ratio of the X(3872) and ψ(2S) in the same decay channel, using the statistics collected by CMS at √s = 7TeV in 2010, corresponding to ∼ 40 pb−1 of integrated luminosity. The increased number of reconstructed X(3872) in 2011 collisions, corresponding to an integrated luminosity of about 1 fb−1, permits to continue the study of this particle.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Heavy quarkonia ; Decays of J/Ψ, Υ, and other quarkonia ; Exotic mesons |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 24 Apr 2020 16:00 |
| Last Modified: | 24 Apr 2020 16:00 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/17926 |
Actions (login required)
 |
View Item |
