Abstract
Measurements of charged dihadron angular correlations are presented in proton–proton (pp) and lead–lead (PbPb) collisions, over a broad range of pseudorapidity and azimuthal angle, using the CMS detector at the LHC. In very high multiplicity pp events at center-of-mass energy of 7 TeV, a striking ‘ridge’-like structure emerges in the two-dimensional correlation function for particle pairs with intermediate pT of 1–3 GeV/c, in the kinematic region 2.0 < |Δη| < 4.8 and small Δϕ, which is similar to observations in heavy-ion collisions. Studies of this new effect as a function of particle transverse momentum are discussed. The long-range and short-range dihadron correlations are also studied in PbPb collision at a nucleon–nucleon center-of-mass energy of 2.76 TeV, as a function of transverse momentum and collision centrality. A Fourier analysis of the long-range dihadron correlations is presented and discussed in the context of CMS measurements of higher order flow coefficients.
Highlights
Measurements of charged dihadron angular correlations are presented in proton-proton and Lead-Lead (PbPb) collisions, over a broad range of pseudorapidity and azimuthal angle, using the Compact Muon Solenoid (CMS) detector at the LHC
In very high multiplicity pp events at center-of-mass energy of 7 TeV, a striking ”ridge”-like structure emerges in the two-dimensional correlation function for particle pairs with intermediate pT of 1–3 GeV/c, in the kinematic region 2.0 < |∆η| < 4.8 and small ∆φ, which is similar to observations in heavy-ion collisions
The long-range and shortrange dihadron correlations are studied in PbPb collision at a nucleon-nucleon center-of-mass energy of 2.76 TeV, as a function of transverse momentum and collision centrality
Summary
The per-trigger-particle associated yield distribution of charged hadrons√as a function of ∆η and ∆φ in high multiplicity (N ≥ 110) pp collisions at s = 7 TeV with trigger particles with 2 < ptTrig < 3 GeV/c and associated particles with 1 < paTssoc < 2 GeV/c is shown in Fig. 1 (left). In order to fully explore the detailed properties of both short-range jet-like correlations and long-range ridge-like structure, especially its dependence on event multiplicity and transverse momentum, the associated yield distributions are obtained in eight bins Yields of charged√hadrons as pp collisions at s =7 TeV, a function for six ptTrig of |∆φ|, from the high multiplicity and paTssoc bins.
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