Content area
Abstract
The production of the neutral strange hadrons K0S, Λ and Λ̄ has been measured in ep collisions at HERA using the ZEUS detector. Cross sections, baryon-to-meson ratios, relative yields of strange and charged light hadrons, Λ (Λ̄) asymmetry and polarization have been measured in three kinematic regions: Q2 > 25 GeV2; 5 < Q2 < 25 GeV2; and in photoproduction (Q2≃0). In photoproduction the presence of two hadronic jets, each with at least 5 GeV transverse energy, was required. The measurements agree in general with Monte Carlo models and are consistent with measurements made at e+e- colliders, except for an enhancement of baryon relative to meson production in photoproduction.
Details
Title
Measurement of K0 S, Λ and Λ̄ production at HERA
Author
Chekanov, S 1 ; Derrick, M 1 ; Magill, S 1 ; Miglioranzi, S 2 ; Musgrave, B 1 ; Nicholass, D 2 ; Repond, J 1 ; Yoshida, R 1 ; Mattingly, MCK 3 ; Jechow, M 4 ; Pavel, N 4 ; AG Yagües Molina 4 ; Antonelli, S 5 ; Antonioli, P 5 ; Bari, G 5 ; Basile, M 5 ; Bellagamba, L 5 ; Bindi, M 5 ; Boscherini, D 5 ; Bruni, A 5 ; Bruni, G 5 ; Cifarelli, L 5 ; Cindolo, F 5 ; Contin, A 5 ; Corradi, M 6 ; De Pasquale, S 5 ; Iacobucci, G 5 ; Margotti, A 5 ; Nania, R 5 ; Polini, A 5 ; Rinaldi, L 5 ; Sartorelli, G 5 ; Zichichi, A 5 ; Bartsch, D 7 ; Brock, I 7 ; Goers, S 7 ; Hartmann, H 7 ; Hilger, E 7 ; H-P, Jakob 7 ; Jüngst, M 7 ; Kind, OM 7 ; Paul, E 7 ; Rautenberg, J 8 ; Renner, R 7 ; Samson, U 7 ; Schönberg, V 7 ; Shehzadi, R 7 ; Wang, M 9 ; Wlasenko, M 7 ; Brook, N H 10 ; Heath, G P 10 ; Morris, J D 10 ; Namsoo, T 10 ; Capua, M 11 ; Fazio, S 11 ; Mastroberardino, A 11 ; Schioppa, M 11 ; Susinno, G 11 ; Tassi, E 11 ; Kim, J Y 12 ; Ma, K J 12 ; Ibrahim, Z A 13 ; Kamaluddin, B 13 ; WAT Wan Abdullah 13 ; Ning, Y 14 ; Ren, Z 14 ; Sciulli, F 14 ; Chwastowski, J 15 ; Eskreys, A 15 ; Figiel, J 15 ; Galas, A 15 ; Gil, M 15 ; Olkiewicz, K 15 ; Stopa, P 15 ; Zawiejski, L 15 ; Adamczyk, L 16 ; Bołd, T 16 ; Grabowska-Bołd, I 16 ; Kisielewska, D 16 ; Łukasik, J 16 ; Przybycień, M 16 ; Suszycki, L 16 ; Kotański, A 17 ; Słomiński, W 17 ; Adler, V 18 ; Behrens, U 18 ; Bloch, I 18 ; Bonato, A 18 ; Borras, K 18 ; Coppola, N 18 ; Fourletova, J 18 ; Geiser, A 18 ; Gladkov, D 18 ; Göttlicher, P 19 ; Gregor, I 18 ; Haas, T 18 ; Hain, W 18 ; Horn, C 18 ; Kahle, B 18 ; Kötz, U 18 ; Kowalski, H 18 ; Lobodzinska, E 18 ; Löhr, B 18 ; Mankel, R 18 ; I-A Melzer-Pellmann 18 ; Montanari, A 18 ; Notz, D 18 ; Nuncio-Quiroz, A E 18 ; Santamarta, R 18 ; Schneekloth, U 18 ; Spiridonov, A 20 ; Stadie, H 18 ; Stösslein, U 18 ; Szuba, D 21 ; Szuba, J 22 ; Theedt, T 18 ; Wolf, G 18 ; Wrona, K 18 ; Youngman, C 18 ; Zeuner, W 18 ; Lohmann, W 23 ; Schlenstedt, S 23 ; Barbagli, G 24 ; Gallo, E 24 ; Pelfer, P G 24 ; Bamberger, A 25 ; Dobur, D 25 ; Karstens, F 25 ; Vlasov, N N 25 ; Bussey, P J 26 ; Doyle, A T 26 ; Dunne, W 26 ; Ferrando, J 26 ; Saxon, D H 26 ; Skillicorn, I O 26 ; Gialas, I 27 ; Gosau, T 28 ; Holm, U 28 ; Klanner, R 28 ; Lohrmann, E 28 ; Salehi, H 28 ; Schleper, P 28 ; Schörner-Sadenius, T 28 ; Sztuk, J 28 ; Wichmann, K 28 ; Wick, K 28 ; Foudas, C 29 ; Fry, C 29 ; Long, K R 29 ; Tapper, AD 29 ; Kataoka, M 30 ; Matsumoto, T 31 ; Nagano, K 31 ; Tokushuku, K 32 ; Yamada, S 31 ; Yamazaki, Y 31 ; AN Barakbaev 33 ; Boos, E G 33 ; Dossanov, A 33 ; Pokrovskiy, N S 33 ; Zhautykov, BO 33 ; Son, D 34 ; de Favereau, J 35 ; Piotrzkowski, K 35 ; Barreiro, F 36 ; Glasman, C 36 ; Jimenez, M 36 ; Labarga, L 36 ; J del Peso 36 ; Ron, E 36 ; Soares, M 36 ; Terrón, J 36 ; Zambrana, M 36 ; Corriveau, F 37 ; Liu, C 37 ; Walsh, R 37 ; Zhou, C 37 ; Tsurugai, T 38 ; Antonov, A 39 ; BA Dolgoshein 39 ; Rubinsky, I 39 ; Sosnovtsev, V 39 ; Stifutkin, A 39 ; Suchkov, S 39 ; Dementiev, R K 40 ; Ermolov, P F 40 ; Gladilin, L K 40 ; Katkov, I I 40 ; LA Khein 40 ; Korzhavina, IA 40 ; Kuzmin, V A 40 ; Levchenko, B B 40 ; Lukina, O Y 40 ; Proskuryakov, A S 40 ; Shcheglova, L M 40 ; Zotkin, D S 40 ; Zotkin, SA 40 ; Abt, I 41 ; Büttner, C 41 ; Caldwell, A 41 ; Kollar, D 41 ; Schmidke, W B 41 ; Sutiak, J 41 ; Grigorescu, G 42 ; Keramidas, A 42 ; Koffeman, E 42 ; Kooijman, P 42 ; Pellegrino, A 42 ; Tiecke, H 42 ; Vázquez, M 43 ; Wiggers, L 42 ; Brümmer, N 44 ; Bylsma, B 44 ; Durkin, L S 44 ; Lee, A 44 ; Ling, TY 44 ; Allfrey, P D 45 ; Bell, MA 45 ; Cooper-Sarkar, A M 45 ; Cottrell, A 45 ; Devenish, RCE 45 ; Foster, B 45 ; Korcsak-Gorzo, K 45 ; Patel, S 45 ; Roberfroid, V 45 ; Robertson, A 45 ; Straub, P B 45 ; Uribe-Estrada, C 45 ; Walczak, R 45 ; Bellan, P 46 ; Bertolin, A 46 ; Brugnera, R 46 ; Carlin, R 46 ; Ciesielski, R 46 ; F Dal Corso 46 ; Dusini, S 46 ; Garfagnini, A 46 ; Limentani, S 46 ; Longhin, A 46 ; Stanco, L 46 ; Turcato, M 46 ; Oh, B Y 47 ; Raval, A 47 ; Ukleja, J 47 ; Whitmore, J J 47 ; Iga, Y 48 ; G D’Agostini 49 ; Marini, G 49 ; Nigro, A 49 ; Cole, JE 50 ; Hart, J C 50 ; Abramowicz, H 51 ; Gabareen, A 52 ; Ingbir, R 52 ; Kananov, S 52 ; Levy, A 52 ; Kuze, M 53 ; Hori, R 54 ; Kagawa, S 55 ; Okazaki, N 54 ; Shimizu, S 54 ; Tawara, T 54 ; Hamatsu, R 56 ; Kaji, H 57 ; Kitamura, S 56 ; Ota, O 56 ; Ri, Y D 56 ; Ferrero, MI 58 ; Monaco, V 58 ; Sacchi, R 58 ; Solano, A 58 ; Arneodo, M 59 ; Ruspa, M 59 ; Fourletov, S 60 ; Martin, J F 60 ; Boutle, S K 61 ; Butterworth, J M 61 ; Gwenlan, C 61 ; Jones, T W 61 ; Loizides, J H 61 ; Sutton, M R 61 ; Targett-Adams, C 61 ; Wing, M 61 ; Brzozowska, B 62 ; Ciborowski, J 63 ; Grzelak, G 62 ; Kulinski, P 62 ; Łużniak, P 64 ; Malka, J 64 ; Nowak, R J 62 ; Pawlak, J M 62 ; Tymieniecka, T 62 ; Ukleja, A 62 ; Żarnecki, A F 62 ; Adamus, M 65 ; Plucinski, P 65 ; Eisenberg, Y 66 ; Giller, I 66 ; Hochman, D 66 ; Karshon, U 66 ; Rosin, M 66 ; Brownson, E 67 ; Danielson, T 67 ; Everett, A 67 ; Kçira, D 67 ; Reeder, D D 67 ; Ryan, P 67 ; Savin, A A 67 ; Smith, W H 67 ; Wolfe, H 67 ; Bhadra, S 68 ; Catterall, C D 68 ; Cui, Y 68 ; Hartner, G 68 ; Menary, S 68 ; Noor, U 68 ; Standage, J 68 ; Whyte, J 68
1 Argonne National Laboratory, Argonne, Illinois, USA
2 Argonne National Laboratory, Argonne, Illinois, USA; also affiliated with University College London, London, UK
3 Andrews University, Berrien Springs, Michigan, USA
4 Institut für Physik der Humboldt-Universität zu Berlin, Berlin, Germany
5 University and INFN Bologna, Bologna, Italy
6 University and INFN Bologna, Bologna, Italy; Alexander von Humboldt Fellow, also at University of Hamburg, Hamburg, Germany
7 Physikalisches Institut der Universität Bonn, Bonn, Germany
8 Physikalisches Institut der Universität Bonn, Bonn, Germany; now at Univ. of Wuppertal, Wuppertal, Germany
9 Physikalisches Institut der Universität Bonn, Bonn, Germany; now at University of Regina, Regina, Canada
10 H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
11 Physics Department and INFN, Calabria University, Cosenza, Italy
12 Chonnam National University, Kwangju, South Korea
13 Jabatan Fizik, Universiti Malaya, Kuala Lumpur, Malaysia
14 Nevis Laboratories, Columbia University, Irvington on Hudson, New York, USA
15 The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
16 Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Cracow, Poland
17 Department of Physics, Jagellonian University, Cracow, Poland
18 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
19 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany; now at DESY group FEB, Hamburg, Germany
20 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany; also at Institut of Theoretical and Experimental Physics, Moscow, Russia
21 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany; also at INP, Cracow, Poland
22 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany; on leave of absence from FPACS AGH-UST, Cracow, Poland
23 Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany
24 University and INFN, Florence, Italy
25 Fakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany
26 Department of Physics and Astronomy, University of Glasgow, Glasgow, UK
27 Department of Engineering in Management and Finance, University of Aegean, Mytilene, Greece
28 Institute of Exp. Physics, Hamburg University, Hamburg, Germany
29 High Energy Nuclear Physics Group, Imperial College London, London, UK
30 Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan; now at CERN, Geneva, Switzerland
31 Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan
32 Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan; also at University of Tokyo, Tokyo, Japan
33 Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan
34 Center for High Energy Physics, Kyungpook National University, Daegu, South Korea
35 Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
36 Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain
37 Department of Physics, McGill University, Montréal, Québec, Canada
38 Faculty of General Education, Meiji Gakuin University, Yokohama, Japan
39 Moscow Engineering Physics Institute, Moscow, Russia
40 Institute of Nuclear Physics, Moscow State University, Moscow, Russia
41 Max-Planck-Institut für Physik, München, Germany
42 NIKHEF and University of Amsterdam, Amsterdam, Netherlands
43 NIKHEF and University of Amsterdam, Amsterdam, Netherlands; now at CERN, Geneva, Switzerland
44 Physics Department, Ohio State University, Columbus, Ohio, USA
45 Department of Physics, University of Oxford, Oxford, UK
46 Dipartimento di Fisica dell’ Università and INFN, Padova, Italy
47 Department of Physics, Pennsylvania State University, Pennsylvania , USA
48 Polytechnic University, Sagamihara, Japan
49 Dipartimento di Fisica, Università ’La Sapienza’ and INFN, Rome, Italy
50 Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK
51 Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel-Aviv University, Tel-Aviv, Israel; Alexander von Humboldt Research Award, Munich, Germany
52 Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel-Aviv University, Tel-Aviv, Israel
53 Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
54 Department of Physics, University of Tokyo, Tokyo, Japan
55 Department of Physics, University of Tokyo, Tokyo, Japan; now at KEK, Tsukuba, Japan
56 Department of Physics, Tokyo Metropolitan University, Tokyo, Japan
57 Department of Physics, Tokyo Metropolitan University, Tokyo, Japan; now at Nagoya University, Nagoya, Japan
58 Università di Torino and INFN, Torino, Italy
59 Università del Piemonte Orientale Novara, and INFN, Torino, Italy
60 Department of Physics, University of Toronto, Toronto, Ontario, Canada
61 Physics and Astronomy Department, University College London, London, UK
62 Institute of Experimental Physics, Warsaw University, Warsaw, Poland
63 Institute of Experimental Physics, Warsaw University, Warsaw, Poland; also at Łódź University, Łódź, Poland
64 Institute of Experimental Physics, Warsaw University, Warsaw, Poland; Łódź University, Łódź, Poland
65 Institute for Nuclear Studies, Warsaw, Poland
66 Department of Particle Physics, Weizmann Institute, Rehovot, Israel
67 Department of Physics, University of Wisconsin, Madison, Wisconsin, USA
68 Department of Physics, York University, Ontario, Canada
1 Argonne National Laboratory, Argonne, Illinois, USA
2 Argonne National Laboratory, Argonne, Illinois, USA; also affiliated with University College London, London, UK
3 Andrews University, Berrien Springs, Michigan, USA
4 Institut für Physik der Humboldt-Universität zu Berlin, Berlin, Germany
5 University and INFN Bologna, Bologna, Italy
6 University and INFN Bologna, Bologna, Italy; Alexander von Humboldt Fellow, also at University of Hamburg, Hamburg, Germany
7 Physikalisches Institut der Universität Bonn, Bonn, Germany
8 Physikalisches Institut der Universität Bonn, Bonn, Germany; now at Univ. of Wuppertal, Wuppertal, Germany
9 Physikalisches Institut der Universität Bonn, Bonn, Germany; now at University of Regina, Regina, Canada
10 H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
11 Physics Department and INFN, Calabria University, Cosenza, Italy
12 Chonnam National University, Kwangju, South Korea
13 Jabatan Fizik, Universiti Malaya, Kuala Lumpur, Malaysia
14 Nevis Laboratories, Columbia University, Irvington on Hudson, New York, USA
15 The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
16 Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Cracow, Poland
17 Department of Physics, Jagellonian University, Cracow, Poland
18 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
19 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany; now at DESY group FEB, Hamburg, Germany
20 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany; also at Institut of Theoretical and Experimental Physics, Moscow, Russia
21 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany; also at INP, Cracow, Poland
22 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany; on leave of absence from FPACS AGH-UST, Cracow, Poland
23 Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany
24 University and INFN, Florence, Italy
25 Fakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany
26 Department of Physics and Astronomy, University of Glasgow, Glasgow, UK
27 Department of Engineering in Management and Finance, University of Aegean, Mytilene, Greece
28 Institute of Exp. Physics, Hamburg University, Hamburg, Germany
29 High Energy Nuclear Physics Group, Imperial College London, London, UK
30 Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan; now at CERN, Geneva, Switzerland
31 Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan
32 Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan; also at University of Tokyo, Tokyo, Japan
33 Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan
34 Center for High Energy Physics, Kyungpook National University, Daegu, South Korea
35 Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium
36 Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain
37 Department of Physics, McGill University, Montréal, Québec, Canada
38 Faculty of General Education, Meiji Gakuin University, Yokohama, Japan
39 Moscow Engineering Physics Institute, Moscow, Russia
40 Institute of Nuclear Physics, Moscow State University, Moscow, Russia
41 Max-Planck-Institut für Physik, München, Germany
42 NIKHEF and University of Amsterdam, Amsterdam, Netherlands
43 NIKHEF and University of Amsterdam, Amsterdam, Netherlands; now at CERN, Geneva, Switzerland
44 Physics Department, Ohio State University, Columbus, Ohio, USA
45 Department of Physics, University of Oxford, Oxford, UK
46 Dipartimento di Fisica dell’ Università and INFN, Padova, Italy
47 Department of Physics, Pennsylvania State University, Pennsylvania , USA
48 Polytechnic University, Sagamihara, Japan
49 Dipartimento di Fisica, Università ’La Sapienza’ and INFN, Rome, Italy
50 Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK
51 Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel-Aviv University, Tel-Aviv, Israel; Alexander von Humboldt Research Award, Munich, Germany
52 Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel-Aviv University, Tel-Aviv, Israel
53 Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
54 Department of Physics, University of Tokyo, Tokyo, Japan
55 Department of Physics, University of Tokyo, Tokyo, Japan; now at KEK, Tsukuba, Japan
56 Department of Physics, Tokyo Metropolitan University, Tokyo, Japan
57 Department of Physics, Tokyo Metropolitan University, Tokyo, Japan; now at Nagoya University, Nagoya, Japan
58 Università di Torino and INFN, Torino, Italy
59 Università del Piemonte Orientale Novara, and INFN, Torino, Italy
60 Department of Physics, University of Toronto, Toronto, Ontario, Canada
61 Physics and Astronomy Department, University College London, London, UK
62 Institute of Experimental Physics, Warsaw University, Warsaw, Poland
63 Institute of Experimental Physics, Warsaw University, Warsaw, Poland; also at Łódź University, Łódź, Poland
64 Institute of Experimental Physics, Warsaw University, Warsaw, Poland; Łódź University, Łódź, Poland
65 Institute for Nuclear Studies, Warsaw, Poland
66 Department of Particle Physics, Weizmann Institute, Rehovot, Israel
67 Department of Physics, University of Wisconsin, Madison, Wisconsin, USA
68 Department of Physics, York University, Ontario, Canada
Pages
1-23
Publication year
2007
Publication date
Jun 2007
ISSN
14346044
e-ISSN
14346052
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2293808304
Copyright
The European Physical Journal C is a copyright of Springer, (2007). All Rights Reserved.