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 are presented, using data collected with the CMS detector over a broad range of pseudorapidity (eta) and azimuthal angle (phi). Short-range correlations in Delta(eta), which are studied in minimum bias events, are characterized using a simple "independent cluster" parametrization in order to quantify their strength (cluster size) and their extent in eta (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 nb(-1) data set at 7TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particle pairs with intermediate p(T) of 1-3 GeV/c, 2.0 <vertical bar Delta(eta)vertical bar < 4.8 and Delta phi approximate to 0. This is the first observation of such a long-range, near-side feature in two-particle correlation functions in p p or p (p) over bar collisions.

Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC / Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Erö, J., Fabjan, C., Friedl, M., Frühwirth, R., Ghete, V.M., Hammer, J., Hänsel, S., Hartl, C., Hoch, M., Hörmann, N., Hrubec, J., Jeitler, M., Kasieczka, G., Kiesenhofer, W., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - STAMPA. - 9(2010). [10.1007/JHEP09(2010)091]

Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC

D. Creanza;N. De Filippis;G. Iaselli;G. Maggi;G. Pugliese;
2010

Abstract

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 are presented, using data collected with the CMS detector over a broad range of pseudorapidity (eta) and azimuthal angle (phi). Short-range correlations in Delta(eta), which are studied in minimum bias events, are characterized using a simple "independent cluster" parametrization in order to quantify their strength (cluster size) and their extent in eta (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 nb(-1) data set at 7TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particle pairs with intermediate p(T) of 1-3 GeV/c, 2.0
2010
Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC / Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Erö, J., Fabjan, C., Friedl, M., Frühwirth, R., Ghete, V.M., Hammer, J., Hänsel, S., Hartl, C., Hoch, M., Hörmann, N., Hrubec, J., Jeitler, M., Kasieczka, G., Kiesenhofer, W., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - STAMPA. - 9(2010). [10.1007/JHEP09(2010)091]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/3636
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