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

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

doi:10.1140/epjc/s10052-009-0995-1

Abstract

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 and Lambda production cross sections and their ratios are determined. K_s production is compared to the production of charged particles in the same region of phase space. The Lambda - anti-Lambda 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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