First measurements of the azimuthal anisotropy of neutral pions produced in Pb-Pb collisions at a center-of-mass energy of root S-NN = 2.76 TeV are presented. The amplitudes of the second Fourier component (upsilon(2)) of the pi(0) azimuthal distributions are extracted using an event-plane technique. The values of upsilon(2) are studied as a function of the neutral pion transverse momentum (p(T)) for different classes of collision centrality in the kinematic range 1.6< p(T)<8.0 GeV/c, within the pseudorapidity interval vertical bar eta vertical bar < 0.8. The CMS measurements of upsilon(2)(p(T)) are similar to previously reported pi(0) azimuthal anisotropy results from root S-NN = 200 GeV Au-Au collisions at RHIC, despite a factor of similar to 14 increase in the centerof-mass energy. In the momentum range 2.5<p(T)<5.0 GeV/c, the neutral pion anisotropies are found to be smaller than those observed by CMS for inclusive charged particles. DOI: 10.1103/PhysRevLett.110.042301
Measurement of the Azimuthal Anisotropy of Neutral Pions in Pb-Pb Collisions at root S-NN=2.76 TeV / Chatrchyan, S., Khachatryan, V., Sirunyan, A.m., Tumasyan, A., Adam, W., Aguilo, E., Bergauer, T., Dragicevic, M., Ero, J., Fabjan, C., Friedl, M., Fruhwirth, R., Ghete, V.m., Hammer, J., Hormann, N., Hrubec, J., Jeitler, M., Kiesenhofer, W., Knunz, V., Krammer, M., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 110:4(2013). [10.1103/PhysRevLett.110.042301]
Measurement of the Azimuthal Anisotropy of Neutral Pions in Pb-Pb Collisions at root S-NN=2.76 TeV
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Klukas J; Lanaro A; Lazaridis C; Leonard J; Loveless R; Mohapatra A; Ojalvo I; Palmonari F; Pierro GA; Ross I; Savin A; Smith WH; Swanson J.
2013
Abstract
First measurements of the azimuthal anisotropy of neutral pions produced in Pb-Pb collisions at a center-of-mass energy of root S-NN = 2.76 TeV are presented. The amplitudes of the second Fourier component (upsilon(2)) of the pi(0) azimuthal distributions are extracted using an event-plane technique. The values of upsilon(2) are studied as a function of the neutral pion transverse momentum (p(T)) for different classes of collision centrality in the kinematic range 1.6< p(T)<8.0 GeV/c, within the pseudorapidity interval vertical bar eta vertical bar < 0.8. The CMS measurements of upsilon(2)(p(T)) are similar to previously reported pi(0) azimuthal anisotropy results from root S-NN = 200 GeV Au-Au collisions at RHIC, despite a factor of similar to 14 increase in the centerof-mass energy. In the momentum range 2.5
Citazione
Measurement of the Azimuthal Anisotropy of Neutral Pions in Pb-Pb Collisions at root S-NN=2.76 TeV / Chatrchyan, S., Khachatryan, V., Sirunyan, A.m., Tumasyan, A., Adam, W., Aguilo, E., Bergauer, T., Dragicevic, M., Ero, J., Fabjan, C., Friedl, M., Fruhwirth, R., Ghete, V.m., Hammer, J., Hormann, N., Hrubec, J., Jeitler, M., Kiesenhofer, W., Knunz, V., Krammer, M., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 110:4(2013). [10.1103/PhysRevLett.110.042301]
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