Two-particle correlations in relative azimuthal angle (Delta phi) and pseudorapidity (Delta eta) are measured in root S-NN = 5.02 TeV p + Pb collisions using the ATLAS detector at the LHC. The measurements are performed using approximately 1 mu b(-1) of data as a function of transverse momentum (p(T)) and the transverse energy (Sigma E-T(Pb)) summed over 3.1 < eta < 4.9 in the direction of the Pb beam. The correlation function, constructed from charged particles, exhibits a long-range (2 < vertical bar Delta eta vertical bar < 5) "near-side" (Delta phi similar to 0) correlation that grows rapidly with increasing Sigma E-T(Pb). A long-range "away-side" (Delta phi similar to pi) correlation, obtained by subtracting the expected contributions from recoiling dijets and other sources estimated using events with small Sigma E-T(Pb), is found to match the near-side correlation in magnitude, shape (in Delta eta and Delta phi) and Sigma E-T(Pb) dependence. The resultant Delta phi correlation is approximately symmetric about pi/2, and is consistent with a dominant cos2 Delta phi modulation for all Sigma E-T(Pb) ranges and particle p(T).

Observation of Associated Near-Side and Away-Side Long-Range Correlations in root S-NN=5.02 TeV Proton-Lead Collisions with the ATLAS Detector / G., A., T., A., B., A., J., A., S. A., K., A. A., A., O., A., R., A., B., A., M., A., O. S., A., H., A., H., A., B. S., A., L., A., D. L., A., T. N., A., J., A., S., A., P., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 110:(2013), p. 182302. [10.1103/physrevlett.110.182302]

Observation of Associated Near-Side and Away-Side Long-Range Correlations in root S-NN=5.02 TeV Proton-Lead Collisions with the ATLAS Detector

BAGNAIA, Paolo;BINI, Cesare;DIONISI, Carlo;GAUZZI, Paolo;GENTILE, Simonetta;GIAGU, Stefano;LACAVA, Francesco;LUCI, Claudio;MESSINA, Andrea;MONZANI, SIMONE;SOLFAROLI CAMILLOCCI, ELENA;VERDUCCI, MONICA;
2013

Abstract

Two-particle correlations in relative azimuthal angle (Delta phi) and pseudorapidity (Delta eta) are measured in root S-NN = 5.02 TeV p + Pb collisions using the ATLAS detector at the LHC. The measurements are performed using approximately 1 mu b(-1) of data as a function of transverse momentum (p(T)) and the transverse energy (Sigma E-T(Pb)) summed over 3.1 < eta < 4.9 in the direction of the Pb beam. The correlation function, constructed from charged particles, exhibits a long-range (2 < vertical bar Delta eta vertical bar < 5) "near-side" (Delta phi similar to 0) correlation that grows rapidly with increasing Sigma E-T(Pb). A long-range "away-side" (Delta phi similar to pi) correlation, obtained by subtracting the expected contributions from recoiling dijets and other sources estimated using events with small Sigma E-T(Pb), is found to match the near-side correlation in magnitude, shape (in Delta eta and Delta phi) and Sigma E-T(Pb) dependence. The resultant Delta phi correlation is approximately symmetric about pi/2, and is consistent with a dominant cos2 Delta phi modulation for all Sigma E-T(Pb) ranges and particle p(T).
2013
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of Associated Near-Side and Away-Side Long-Range Correlations in root S-NN=5.02 TeV Proton-Lead Collisions with the ATLAS Detector / G., A., T., A., B., A., J., A., S. A., K., A. A., A., O., A., R., A., B., A., M., A., O. S., A., H., A., H., A., B. S., A., L., A., D. L., A., T. N., A., J., A., S., A., P., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 110:(2013), p. 182302. [10.1103/physrevlett.110.182302]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/555850
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