J/ψ and ψ′ production and their normal nuclear absorption in proton-nucleus collisions at 400 GeV

B. Alessandro; C. Alexa; R. Arnaldi; M. Atayan; S. Beolè; V. Boldea; P. Bordalo; G. Borges; J. Castor; B. Chaurand; B. Cheynis; E. Chiavassa; C. Cicalò; M.P. Comets; S. Constantinescu; P. Cortese; A. De Falco; N. De Marco; G. Dellacasa; A. Devaux; S. Dita; J. Fargeix; P. Force; M. Gallio; C. Gerschel; P. Giubellino; M.B. Golubeva; A. Grigoryan; J.Y. Grossiord; F.F. Guber; A. Guichard; H. Gulkanyan; M. Idzik; D. Jouan; T.L. Karavicheva; L. Kluberg; A.B. Kurepin; Y. Le Bornec; C. Lourenço; M. Mac Cormick; A. Marzari-Chiesa; M. Masera; A. Masoni; M. Monteno; A. Musso; P. Petiau; A. Piccotti; J.R. Pizzi; F. Prino; G. Puddu; C. Quintans; L. Ramello; S. Ramos; L. Riccati; H. Santos; P. Saturnini; E. Scomparin; S. Serci; R. Shahoyan; M. Sitta; P. Sonderegger; X. Tarrago; N.S. Topilskaya; G.L. Usai; E. Vercellin; L. Villatte; N. Willis

doi:10.1140/epjc/s10052-006-0079-4

EPJ

J/ψ and ψ^′ production and their normal nuclear absorption in proton-nucleus collisions at 400 GeV

B. Alessandro¹⁰, C. Alexa³, R. Arnaldi¹⁰, M. Atayan¹², S. Beolè¹⁰, V. Boldea³, P. Bordalo⁶^,13, G. Borges⁶^*, J. Castor², B. Chaurand⁹, B. Cheynis¹¹, E. Chiavassa¹⁰, C. Cicalò⁴, M.P. Comets⁸, S. Constantinescu³, P. Cortese¹, A. De Falco⁴, N. De Marco¹⁰, G. Dellacasa¹, A. Devaux², S. Dita³, J. Fargeix², P. Force², M. Gallio¹⁰, C. Gerschel⁸, P. Giubellino¹⁰, M.B. Golubeva⁷, A. Grigoryan¹², J.Y. Grossiord¹¹, F.F. Guber⁷, A. Guichard¹¹, H. Gulkanyan¹², M. Idzik¹⁰^,14, D. Jouan⁸, T.L. Karavicheva⁷, L. Kluberg⁹, A.B. Kurepin⁷, Y. Le Bornec⁸, C. Lourenço⁵, M. Mac Cormick⁸, A. Marzari-Chiesa¹⁰, M. Masera¹⁰, A. Masoni⁴, M. Monteno¹⁰, A. Musso¹⁰, P. Petiau⁹, A. Piccotti¹⁰, J.R. Pizzi¹¹, F. Prino¹⁰, G. Puddu⁴, C. Quintans⁶, L. Ramello¹, S. Ramos⁶^,13, L. Riccati¹⁰, H. Santos⁶, P. Saturnini², E. Scomparin¹⁰, S. Serci⁴, R. Shahoyan⁶^,15, M. Sitta¹, P. Sonderegger⁵^,13, X. Tarrago⁸, N.S. Topilskaya⁷, G.L. Usai⁴, E. Vercellin¹⁰, L. Villatte⁸, N. Willis⁸ and The NA50 Collaboration

¹ Università del Piemonte Orientale and INFN-Torino, Alessandria, Italy
² LPC, Univ. Blaise Pascal and CNRS-IN2P3, Aubière, France
³ IFA, Bucharest, Romania
⁴ Università di Cagliari/INFN, Cagliari, Italy
⁵ CERN, Geneva, Switzerland
⁶ LIP, Lisbon, Portugal
⁷ INR, Moscow, Russia
⁸ IPN, Univ. de Paris-Sud and CNRS-IN2P3, Orsay, France
⁹ LLR, Ecole Polytechnique and CNRS-IN2P3, Palaiseau, France
¹⁰ Università di Torino/INFN, Torino, Italy
¹¹ IPN, Univ. Claude Bernard Lyon-I and CNRS-IN2P3, Villeurbanne, France
¹² YerPhI, Yerevan, Armenia
¹³ IST, Universidade Técnica de Lisboa, Lisbon, Portugal
¹⁴ Faculty of Physics and Nuclear Techniques, AGH University of Science and Technology, Cracow, Poland
¹⁵ YerPhI, Yerevan, Armenia

Received: 12 April 2006
Revised: 27 July 2006
Published online: 8 November 2006

Abstract

We report a new measurement of J/ψ, ψ^′ and Drell–Yan cross-sections, in the kinematical domain -0.425<y_cm<0.575 and -0.5<cosθ_CS<0.5, performed at the CERN-SPS using 400 GeV/c incident protons on Be, Al, Cu, Ag, W and Pb targets. The dependence of the charmonia production cross-sections on the size of the target nucleus allows to quantify the so-called normal nuclear absorption. In the framework of the Glauber model, this new measurement is combined with results previously obtained with the same apparatus, under different experimental conditions, and leads to a precise determination of the J/ψ and ψ^′ absorption cross-sections in the surrounding nuclear matter.

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EPJ

J/ψ and ψ′ production and their normal nuclear absorption in proton-nucleus collisions at 400 GeV

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J/ψ and ψ^′ production and their normal nuclear absorption in proton-nucleus collisions at 400 GeV