DESY-08-179 March 16 , 2009 V 0 Production in P + A Collisions at √ S = 41 . 6 GeV the HERA-B Collaboration Iris Abt , M. Adams , Michaela Agari , H. Albrecht , Aleksandar Aleksandrov , Vanessa Ferraz do Amaral , António Amorim , S. J. Aplin , Volodymyr Aushev , Yu. Sh. Bagaturia , Vladislav Balagura , Marianne Bargiotti , Oksana V. Barsukova , J. L. García Bastos , J. Batista , Ch Bauer , Th. S. Bauer , Ar. Belkov , Ivan Belotelov , A. Bertin , B. M. Bobchenko , M. Boecker , A. Bogatyrev , Gabriella Bòhm , M. Braeuer , M. Bruinsma , Marco Bruschi , Peter Buchholz , T. Buran , João Carvalho , Patrícia Conde , C. Cruse , Mogens Dam , Karen Danielsen , Mikhail Danilov , S. De Castro , H. Deppe , Xinhan Dong , H. B. Dreis , V. Egorytchev , Klaus Ehret , Fred Louis Eisele , Dmitry Emeliyanov , S. Essenov , Laura Fabbri , Pietro Faccioli , Martin Feuerstack-Raible , Joachim Flammer , B A Fominykh , M. Funcke , Ll. Garrido , Andreas Gellrich , Benedetto Giacobbe , Joachim Gläß , D. Goloubkov , Yu. A. Golubkov , Andrey Golutvin , Igor Golutvin , I. Gorbounov , Andrej Gorišek , O. Gouchtchine , D. C. Goulart , Stefan Gradl , Wolfgang Gradl , Florent Grimaldi , Jacob Groth-Jensen , Yu. Guilitsky , J. D. Hansen , Jose M Hernandez , Werner Hofmann , M. Hohlmann , T. Hott , Wouter Hulsbergen , Ulrich Husemann , Olga Igonkina , Michael Ispiryan , T. Jagła , Chunxuan Jiang , H. Kapitza , S. Karabekyan , Nadiia Karpenko , S. Keller , J. Kessler , F. M. Khasanov , Yu. Kiryushin , Ivan Kisel , Esben Klinkby , K. T. Knoepfle , Hermann Kolanoski , S. Korpar , C. B. Krauss , Peter Kreuzer , P. Križan , Dirk Krücker , Stefan Kupper , T. Kvaratskheliia , Alexander V. Lanyov , K. Lau , Birgit Lewendel , Thomas Lohse , B. N. Lomonosov , Reinhard Maenner , Rainer Mankel , Silvia Masciocchi , Ignazio Massa , I. Matchikhilian , Gordana. Medin , Michael Medinnis , M. Mevius , Andrea Michetti , Yu. Mikhailov , R. Mizuk , R. Muresan , Martin zur Nedden , M. Negodaev , Marko Noerenberg , Sebastian Nowak , Michael D. Vera , Mohamed Ouchrif , Farid Ould-Saada , Cristóbal Padilla , Danielle Peralta , Roman Pernack , Rok Pestotnik , B. Aa. Petersen , Maurizio Piccinini , M. A. Pleier , M. Poli , Vladimir Popov , D. Pose , Stacey Prystupa , V. Pugatch , Yuriy Pylypchenko , Jorg Pyrlik , Kendall Reeves , Dominik Ressing , Hartmut Rick , Imma Ríu , Peter Robmann , Irina Rostovtseva , V. Rybnikov , Fabio Sanchez , Antonio Sbrizzi , Michael Schmelling , Burkhard Schmidt , Anne Schreiner , H. Schroeder , Ullrich Schwanke , A. J. Schwartz , A. S. Schwarz , B. Schwenninger , Bernhard Schwingenheuer , F. G. Sciacca , Nicola Semprini-Cesari , S. V. Shuvalov , Lu'is Silva , L. Sözüer , S. A. Solunin , A. Somov , S. Somov , Johannes Spengler , Roberto Spighi , Alexander Spiridonov , Aleš Stanovnik , Marko Staric , Christian Stegmann , Halasya Siva Subramania , Michael Symalla , I. Tikhomirov , Maksym Titov , Ivan Tsakov , Ulrich Uwer , Christopher van Eldik , Yu. Vassiliev , Mauro Villa , Antonio Vitale , Ilija Vukotic , Hernan Wahlberg , A. H. Walenta , M. Walter , Jianguo Jack Wang , Debby Wegener , U. Werthenbach , Helmut Wolters , Rainer Wurth , A. Wurz , S. Xella-Hansen , Yu. Zaitsev , Mikhail Zavertyaev , T. Zeuner , Alexey Zhelezov , Z. Zheng , Robert Zimmermann , Tomi Živko , Antonio Zoccoli semanticscholar（2009）
摘要
Inclusive doubly differential cross sections d2σpA/dxF dp 2 T as a function of Feynman-x (xF ) and transverse momentum (pT ) for the production of K 0 S, Λ and Λ̄ in proton-nucleus interactions at 920 GeV are presented. The measurements were performed by HERA-B in the negative xF range (−0.12 < xF < 0.0) and for transverse momenta up to pT = 1.6 GeV/c. Results for three target materials: carbon, titanium and tungsten are given. The ratios of production cross sections are presented and discussed. The Cronin effect is clearly observed for all three V 0 species. The atomic number dependence is parameterized as σpA = σpN · A α where σpN is the proton-nucleon cross section. The measured values of α are all near one. The results are compared with EPOS1.67 and PYTHIA6.3. EPOS reproduces the data to within ≈ 20% except at very low transverse momentum. PACS 13.85.Hd, 14.20.Jn, 14.40.Aq
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