High Energy Physics Seminars

Bose-Einstein correlation measurements at CMS

by Dr. Sunil Dogra (Universidade Estadual Paulista & Universidade Federal do ABC Sao Paulo, Brazil)

Friday, February 23, 2018 from to (Asia/Kolkata)
at TIFR, Mumbai ( A-269 )
Description
Multi-particle correlations in hadronic colliding systems at both RHIC and the LHC are under detailed investigation in recent years. A wealth of experimental evidence or signatures suggest the presence of collective phenomena and the formation of a quark-gluon plasma (QGP) also in high-multiplicity pp and pPb collisions at LHC. One such signature, quantum-statistical (Bose-Einstein) correlations from CMS experiment will be discussed. The BEC correlations are measured in proton-proton collisions at 0.9, 2.76 and 7 TeV, and in proton-lead collisions at 5.02 TeV/nucleon pair center-of-mass energy with the CMS detector at the LHC. The correlation functions are extracted in terms of different components of the relative momentum of the pair, in order to investigate the extension of the emission source in different directions. The results are presented for different intervals of transverse pair momentum kT and charged particle multiplicity of the collision, Nch, as well as for their integrated values. Besides inclusive charged particles, charged pions and kaons, identified via their energy loss in the silicon tracker detector, can also be correlated. The extracted source radii are reaching the highest values for very high multiplicity pPb collisions, and decrease with increasing kT .  The results open the possibility to study scaling and factorization properties of these radii as a function of multiplicity, kT, colliding system size and center-of-mass energy.