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Measurement of inelastic, single- and double-diffraction cross sections in proton--proton collisions at the LHC with ALICE
Abelev B., Cheshkov C., Cheynis B., Ducroux L., Grossiord J.-Y. et al
European Physical Journal C: Particles and Fields 73 (2013) 2456 - http://hal.in2p3.fr/in2p3-00725471
Physique/Physique des Hautes Energies - Expérience
Measurement of inelastic, single- and double-diffraction cross sections in proton--proton collisions at the LHC with ALICE
B. Abelev, c. Cheshkov1, B. Cheynis1, L. Ducroux1, J.-Y. Grossiord1, M. Guilbaud1, R. Tieulent1, A. Uras1, Y. Zoccarato1, L. Aphecetche2, Guillaume Batigne ()2, E. Bergognon2, M. Bregant2, H. Delagrange2, O. Driga2, B. Erazmus2, M. Estienne2, M. Germain2, A. Lardeux2, F. Lefèvre2, L. Luquin2, G. Martinez Garcia2, A. Mas2, L. Massacrier2, A. Matyja2, P. Pillot2, Y. Schutz2, A. Shabetai2, D. Stocco2, Y. .W. Baek3, A. Baldit3, V. Barret3, N. Bastid3, P. Crochet3, P. Dupieux3, R. Ichou3, X. Lopez3, F. Manso3, M. Marchisone3, S. Porteboeuf-Houssais3, P. Rosnet3, B. Vulpescu3, X. Zhang3, N. Arbor4, G. Conesa Balbastre4, J. Faivre4, C. Furget4, R. Guernane4, S. Kox4, J.S. Real4, C. Silvestre4
1 :  IPNL - Institut de Physique Nucléaire de Lyon
CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I (UCBL)
2 :  SUBATECH - Laboratoire SUBATECH Nantes
CNRS : UMR6457 – IN2P3 – Université de Nantes – École Nationale Supérieure des Mines - Nantes
4, rue Alfred Kastler - 44070 Nantes Cedex 03
3 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
CNRS : UMR6533 – IN2P3 – Université Blaise Pascal - Clermont-Ferrand II
Campus des Cézeaux 24, avenue des Landais BP 80026 63171 Aubière Cedex
4 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
CNRS : UMR5821 – IN2P3 – Université Joseph Fourier - Grenoble I – Institut Polytechnique de Grenoble - Grenoble Institute of Technology
53 avenue des Martyrs - 38026 Grenoble Cedex
Measurements of cross sections of inelastic and diffractive processes in proton--proton collisions at LHC energies were carried out with the ALICE detector. The fractions of diffractive processes in inelastic collisions were determined from a study of gaps in charged particle pseudorapidity distributions: for single diffraction (diffractive mass $M_X < 200$ GeV/$c^2$) $\sigma_{\rm SD}/\sigma_{\rm INEL} = 0.21 \pm 0.03, 0.20^{+0.07}_{-0.08}$, and $0.20^{+0.04}_{-0.07}$, respectively at centre-of-mass energies $\sqrt{s} = 0.9, 2.76$, and 7 TeV; for double diffraction (for a pseudorapidity gap $\Delta\eta > 3$) $\sigma_{\rm DD}/\sigma_{\rm INEL} = 0.11 \pm 0.03, 0.12 \pm 0.05$, and $0.12^{+0.05}_{-0.04}$, respectively at $\sqrt{s} = 0.9, 2.76$, and 7 TeV. To measure the inelastic cross section, beam properties were determined with van der Meer scans, and, using a simulation of diffraction adjusted to data, the following values were obtained: $\sigma_{\rm INEL} = 62.8^{+2.4}_{-4.0} (model) \pm 1.2 (lumi)$ mb at $\sqrt{s} =$ 2.76 TeV and $73.2^{+2.0}_{-4.6} (model) \pm 2.6 (lumi)$ mb at $\sqrt{s}$ = 7 TeV. The single- and double-diffractive cross sections were calculated combining relative rates of diffraction with inelastic cross sections. The results are compared to previous measurements at proton--antiproton and proton--proton colliders at lower energies, to measurements by other experiments at the LHC, and to theoretical models.

Articles dans des revues avec comité de lecture
European Physical Journal C: Particles and Fields (Eur. Phys. J. C)
Publisher EDP Sciences: EPJ
ISSN 1434-6044 (eISSN : 1434-6052)

SUBATECH-Plasma , LPSC12253
see paper for full list of authors, 27 pages, 12 figures, submitted to Eur. Phys. J. C
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