LHC Seminar

Long-Range Near-Side Angular Correlations in Proton-Proton Interactions in CMS.

by Guido Tonelli (Universita' di Pisa, INFN, CERN), Gunther Roland (Massachusetts Institute of Technology (MIT))

Tuesday, 21 September 2010 from to (Europe/Zurich)
at CERN ( 500-1-001 - Main Auditorium )
EVO Universe, password "seminar"; Phone Bridge ID: 2330444 Password: 5142
Description The CMS Collaboration Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center of mass energies of 0.9, 2.36 and 7TeV over a broad range of pseudorapidity (η) and azimuthal angle (φ) are presented using data collected with the CMS detector at the LHC. Short-range correlations in ∆η, which are studied in minimum bias events, are characterized using a simple independent cluster parameterization in order to quantify their strength (cluster size) and their extent in η (cluster decay width). Long-range azimuthal correlations are studied more differentially as a function of charged particle multiplicity and particle transverse momentum using a 980nb−1 data set at 7TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particles in intermediate pT’s of 1-3GeV/c, 2.0< |∆η|<4.8 and ∆φ≈0. This is the first observation of such a ridge-like feature in two-particle correlation functions in pp or p-pbar collisions.

EVO Universe, password "seminar"; Phone Bridge ID: 2330444 Password: 5142
Organised by M.Mangano, M.Spiropulu, G.Unal........................**Tea and Coffee will be served at 16:30