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Observation of associated near-side and away-side long-range correlations in sqrt[s(NN)]=5.02 TeV proton-lead collisions with the ATLAS detector.
Phys Rev Lett ; 110(18): 182302, 2013 May 03.
Article in En | MEDLINE | ID: mdl-23683193
ABSTRACT
Two-particle correlations in relative azimuthal angle (Δø) and pseudorapidity (Δη) are measured in sqrt[s(NN)] = 5.02 TeV p+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using approximately 1 µb(-1) of data as a function of transverse momentum (p(T)) and the transverse energy (ΣE(T)(Pb)) summed over 3.1 < η < 4.9 in the direction of the Pb beam. The correlation function, constructed from charged particles, exhibits a long-range (2 < |Δ Î· | < 5) "near-side" (Δø ~ 0) correlation that grows rapidly with increasing ΣE(T)(Pb). A long-range "away-side" (Δø ~ π) correlation, obtained by subtracting the expected contributions from recoiling dijets and other sources estimated using events with small ΣE(T)(Pb), is found to match the near-side correlation in magnitude, shape (in Δη and Δø) and ΣE(T)(Pb) dependence. The resultant Δø correlation is approximately symmetric about π/2, and is consistent with a dominant cos2Δø modulation for all ΣE(T)(Pb) ranges and particle p(T).
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Collection: 01-internacional Database: MEDLINE Type of study: Risk_factors_studies Language: En Journal: Phys Rev Lett Year: 2013 Document type: Article Affiliation country: Alemania
Search on Google
Collection: 01-internacional Database: MEDLINE Type of study: Risk_factors_studies Language: En Journal: Phys Rev Lett Year: 2013 Document type: Article Affiliation country: Alemania