Measurement of the upsilon(1S) production cross-section in pp collisions at root s=7 TeV
Makaleler > Tam Makale · 2011
Yazarlar: G. Aad, B. Abbott, J. Abdallah, A. A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi, M. Abolins, H. Abramowicz, H. Abreu, E. Acerbi, B. S. Acharya, D. L. Adams, T. N. Addy, J. Adelman, M. Aderholz, S. Adomeit, P. Adragna, T. Adye, S. Aefsky, J. A. Aguilar-Saavedra, M. Aharrouche, S. P. Ahlen, F. Ahles, A. Ahmad, M. Ahsan, G. Aielli, T. Akdogan, T. P. A. Akesson, G. Akimoto, A. V. Akimov, A. Akiyama, M. S. Alam, M. A. Alam, S. Albrand, M. Aleksa, I. N. Aleksandrov, F. Alessandria, C. Alexa, G. Alexander, G. Alexandre, T. Alexopoulos, M. Alhroob, M. Allev, G. Alimonti, J. Alison, M. Aliyevl, P. P. Allport, S. E. Allwood-Spiers, J. Almond, A. Aloisio, R. Alon, A. Alonso, M. G. Alviggi, K. Amako, P. Amara, C. Amelung, V. V. Ammosov, A. Amorim, G. Amoros, N. Amram, C. Anastopoulos, N. Andari, T. Andeen, C. F. Anders, K. J. Anderson, A. Andreazza, V. Andrei, M. -L. Andrieux, X. S. Anduaga, A. Angerami, F. Anghinolfi, N. Anjos, A. Annovi, A. Antonaki, M. Antonelli, A. Antonov, J. Antos, F. Anulli, S. Aoun, L. Aperio Bella, R. Apolle, G. Arabidze, I. Aracena, Y. Arai, A. T. H. Arce, J. P. Archambault, S. Arfaoui, J. -F. Arguin, E. Arik, M. Arik, A. J. Armbruster, O. Arnaez, C. Arnault, A. Artamonov, G. Artoni, D. Arutinov, S. Asai, R. Asfandiyarov, S. Ask, K. Augsten, M. Aurousseau, E. Banas, E. L. Barberio, D. Benchekroun, S. Bentvelsen, N. Boelaert, A. Bogouch, W. K. Brooks, T. Buanes, L. P. Caloba, L. Chikovani, M. L. Chu, Rena ÇİFTÇİ, V. Cindro, B. Epp, V. Grabski, M. Losada
PHYSICS LETTERS B, SCI Expanded İndekslerine Giren Dergi, Uluslararası, 2011, cilt 705, ss 9-27
DOI: 10.1016/j.physletb.2011.09.092
Özet
A measurement of the cross-section for Upsilon(1S) -> mu(+)mu(-) production in proton-proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the gamma(1S) transverse momentum in two bins of rapidity, vertical bar y(gamma(1S))vertical bar < 1.2 and 1.2 < vertical bar y(gamma(1S))vertical bar < 2.4. The measurement requires that both muons have transverse momentum p(T)(mu) > 4 GeV and pseuclorapidity vertical bar eta(mu)vertical bar < 2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarisation. The results are based on an integrated luminosity of 1.13 pb(-1), collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in PYTHIA while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet model. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.