Measurement of K0 S, Λ and Λ̄ production at HERA

Measurement of K0 S, Λ and Λ̄ production at HERA

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 region...

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Veröffentlicht in:The European physical journal. C, Particles and fields Particles and fields, 2007-06, Vol.51 (1), p.1-23
Hauptverfasser: Chekanov, S., Derrick, M., Magill, S., Miglioranzi, S., Musgrave, B., Nicholass, D., Repond, J., Yoshida, R., Mattingly, M.C.K., Jechow, M., Pavel, N., Yagües Molina, A.G., Antonelli, S., Antonioli, P., Bari, G., Basile, M., Bellagamba, L., Bindi, M., Boscherini, D., Bruni, A., Bruni, G., Cifarelli, L., Cindolo, F., Contin, A., Corradi, M., De Pasquale, S., Iacobucci, G., Margotti, A., Nania, R., Polini, A., Rinaldi, L., Sartorelli, G., Zichichi, A., Bartsch, D., Brock, I., Goers, S., Hartmann, H., Hilger, E., Jakob, H.-P., Jüngst, M., Kind, O.M., Paul, E., Rautenberg, J., Renner, R., Samson, U., Schönberg, V., Shehzadi, R., Wang, M., Wlasenko, M., Brook, N.H., Heath, G.P., Morris, J.D., Namsoo, T., Capua, M., Fazio, S., Mastroberardino, A., Schioppa, M., Susinno, G., Tassi, E., Kim, J.Y., Ma, K.J., Ibrahim, Z.A., Kamaluddin, B., Wan Abdullah, W.A.T., Ning, Y., Ren, Z., Sciulli, F., Chwastowski, J., Eskreys, A., Figiel, J., Galas, A., Gil, M., Olkiewicz, K., Stopa, P., Zawiejski, L., Adamczyk, L., Bołd, T., Grabowska-Bołd, I., Kisielewska, D., Łukasik, J., Przybycień, M., Suszycki, L., Kotański, A., Słomiński, W., Adler, V., Behrens, U., Bloch, I., Bonato, A., Borras, K., Coppola, N., Fourletova, J., Geiser, A., Gladkov, D., Göttlicher, P., Gregor, I., Haas, T., Hain, W., Horn, C., Kahle, B., Kötz, U.
Format: Artikel
Sprache:eng
Schlagworte:
Baryons
Computer simulation
Hadrons
Particle production
Photoproduction
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Zusammenfassung: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.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-007-0299-2