Strangeness production at low Q 2 in deep-inelastic ep scattering at HERA

F. D. Aaron,C. Alexa,V. Andreev,B. Antunovic,S. Aplin, A. Asmone, A. Astvatsatourov,A. Bacchetta,S. Backovic,A. Baghdasaryan,E. Barrelet,W. Bartel, M. Beckingham, K. Begzsuren,O. Behnke, A. Belousov, N. Berger, J. C. Bizot, M.-O. Boenig,V. Boudry,I. Bozovic-Jelisavcic, J. Bracinik, G. Brandt, M. Brinkmann, V. Brisson,D. Bruncko,A. Bunyatyan, G. Buschhorn,L. Bystritskaya,A. J. Campbell,K. B. Cantun Avila, F. Cassol-Brunner,K. Cerny,V. Cerny,V. Chekelian, A. Cholewa,J. G. Contreras, J. A. Coughlan,G. Cozzika, J. Cvach, J. B. Dainton, K. Daum, M. Deák,Y. de Boer, B. Delcourt,M. Del Degan, J. Delvax,A. De Roeck,E. A. De Wolf, C. Diaconu, V. Dodonov, A. Dossanov,A. Dubak, G. Eckerlin,V. Efremenko,S. Egli,R. Eichler,A. Eliseev,E. Elsen, S. Essenov, A. Falkiewicz, P. J. W. Faulkner, L. Favart,A. Fedotov, R. Felst, J. Feltesse, J. Ferencei,M. Fleischer,A. Fomenko, E. Gabathuler, J. Gayler,S. Ghazaryan, A. Glazov,I. Glushkov,L. Goerlich, M. Goettlich, N. Gogitidze, M. Gouzevitch,C. Grab, T. Greenshaw, B. R. Grell, G. Grindhammer,S. Habib, D. Haidt,M. Hansson, C. Helebrant,R. C. W. Henderson, E. Hennekemper,H. Henschel,G. Herrera,M. Hildebrandt,K. H. Hiller,D. Hoffmann, R. Horisberger,A. Hovhannisyan,T. Hreus,M. Jacquet, M. E. Janssen,X. Janssen,V. Jemanov,L. Jönsson, A. W. Jung,H. Jung, M. Kapichine, J. Katzy, I. R. Kenyon, C. Kiesling,M. Klein, C. Kleinwort, T. Klimkovich, T. Kluge, A. Knutsson,R. Kogler,V. Korbel, P. Kostka,M. Kraemer,K. Krastev,J. Kretzschmar, A. Kropivnitskaya, K. Krüger,K. Kutak,M. P. J. Landon, W. Lange, G. Laštovička-Medin,P. Laycock, A. Lebedev, G. Leibenguth, V. Lendermann,S. Levonian,G. Li,K. Lipka,A. Liptaj,B. List,J. List, N. Loktionova, R. Lopez-Fernandez,V. Lubimov, A.-I. Lucaci-Timoce,L. Lytkin, A. Makankine, E. Malinovski, P. Marage,Ll. Marti, H.-U. Martyn, S. J. Maxfield,A. Mehta, K. Meier, A. B. Meyer, H. Meyer, H. Meyer,J. Meyer, V. Michels, S. Mikocki, I. Milcewicz-Mika, F. Moreau,A. Morozov, J. V. Morris, M. U. Mozer,M. Mudrinic,K. Müller, P. Murín, K. Nankov, B. Naroska,Th. Naumann, P. R. Newman, C. Niebuhr, A. Nikiforov,G. Nowak,K. Nowak, M. Nozicka,B. Olivier,J. E. Olsson,S. Osman,D. Ozerov, V. Palichik, I. Panagoulias, M. Pandurovic,Th. Papadopoulou, C. Pascaud, G. D. Patel, O. Pejchal, H. Peng, E. Perez, A. Petrukhin,I. Picuric, S. Piec, D. Pitzl, R. Plačakytė, R. Polifka, B. Povh, T. Preda, V. Radescu, A. J. Rahmat,N. Raicevic, A. Raspiareza, T. Ravdandorj,P. Reimer, E. Rizvi,P. Robmann,B. Roland, R. Roosen, A. Rostovtsev, M. Rotaru,J. E. Ruiz Tabasco,Z. Rurikova,S. Rusakov, D. Salek, F. Salvaire,D. P. C. Sankey,M. Sauter,E. Sauvan,S. Schmidt,S. Schmitt, C. Schmitz, L. Schoeffel,A. Schöning,H.-C. Schultz-Coulon, F. Sefkow, R. N. Shaw-West, I. Sheviakov, L. N. Shtarkov,S. Shushkevich, T. Sloan,I. Smiljanic,P. Smirnov,Y. Soloviev,P. Sopicki,D. South, V. Spaskov, A. Specka, Z. Staykova, M. Steder,B. Stella, U. Straumann,D. Sunar,T. Sykora, V. Tchoulakov, G. Thompson,P. D. Thompson,T. Toll,F. Tomasz, T. H. Tran, D. Traynor, T. N. Trinh, P. Truöl,I. Tsakov, B. Tseepeldorj,I. Tsurin,J. Turnau, E. Tzamariudaki,K. Urban,A. Valkárová, C. Vallée,P. Van Mechelen,A. Vargas Trevino,Y. Vazdik, S. Vinokurova, V. Volchinski, D. Wegener,M. Wessels,Ch. Wissing, E. Wünsch, V. Yeganov, J. Žáček,J. Zálešák,Z. Zhang, A. Zhelezov, A. Zhokin, Y. C. Zhu,T. Zimmermann, H. Zohrabyan, F. Zomer

European Physical Journal C(2009)

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摘要
The production of neutral strange hadrons is investigated using deep-inelastic scattering events measured with the H1 detector at HERA. The measurements are made in the phase space defined by the negative four-momentum transfer squared of the photon 2< Q 2 <100 GeV 2 and the inelasticity 0.1< y <0.6. The K s 0 and () production cross sections and their ratios are determined. K s 0 production is compared to the production of charged particles in the same region of phase space. The Λ – asymmetry is also measured and found to be consistent with zero. Predictions of leading order Monte Carlo programs are compared to the data.
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关键词
Transverse Momentum, Charged Hadron, Strangeness Production, Central Tracking Detector, Strange Hadron
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