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Measurement of the charm fragmentation function in D* photoproduction at HERA

Journal of High Energy Physics 2009:4 (2009)

Authors:

S Chekanov, M Derrick, S Magill, B Musgrave, D Nicholass, J Repond, R Yoshida, MCK Mattingly, P Antonioli, G Bari, L Bellagamba, D Boscherini, A Bruni, G Bruni, F Cindolo, M Corradi, G Iacobucci, A Margotti, R Nania, A Polini, S Antonelli, M Basile, M Bindi, L Cifarelli, A Contin, S De Pasquale, G Sartorelli, A Zichichi, D Bartsch, I Brock, H Hartmann, E Hilger, HP Jakob, M Jüngst, AE Nuncio-Quiroz, E Paul, U Samson, V Schönberg, R Shehzadi, M Wlasenko, NH Brook, GP Heath, JD Morris, M Kaur, P Kaur, I Singh, M Capua, S Fazio, A Mastroberardino, M Schioppa, G Susinno, E Tassi, JY Kim, ZA Ibrahim, FM Idris, B Kamaluddin, WAT Wan Abdullah, Y Ning, Z Ren, F Sciulli, J Chwastowski, A Eskreys, J Figiel, A Galas, K Olkiewicz, B Pawlik, P Stopa, L Zawiejski, L Adamczyk, T Bołd, I Grabowska-Bołd, D Kisielewska, J Łukasik, M Przybycień, L Suszycki, A Kotański, W Słomiński, O Behnke, U Behrens, C Blohm, A Bonato, K Borras, D Bot, R Ciesielski, N Coppola, S Fang, J Fourletova, A Geiser, P Göttlicher, J Grebenyuk, I Gregor, T Haas, W Hain, A Hüttmann, F Januschek, B Kahle, II Katkov, U Klein, U Kötz, H Kowalski

Abstract:

The charm fragmentation function has been measured in D* photoproduction with the ZEUS detector at HERA using an integrated luminosity of 120 pb-1. The fragmentation function is measured versus z = (E +p||)D* /2Ejet, where E is the energy of the D * meson and p|| is the longitudinal momentum of the D * meson relative to the axis of the associated jet of energy Ejet. Jets were reconstructed using the kT clustering algorithm and required to have transverse energy larger than 9GeV. The D* meson associated with the jet was required to have a transverse momentum larger than 2GeV. The measured function is compared to different fragmentation models incorporated in leading-logarithm Monte Carlo simulations and in a next-to-leading-order QCD calculation. The free parameters in each fragmentation model are fitted to the data. The extracted parameters and the function itself are compared to measurements from e+e-experiments. © SISSA 2009.
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Model predictions for HERA, LHC and cosmic rays

Proceedings of the Workshop - HERA and the LHC: Workshop Series on the Implications of HERA for LHC Physics, HERA-LHC 2006 - 2008 (2009) 611-627

Authors:

A Bunyatyan, A Cooper-Sarkar, C Diaconu, R Engel, C Kiesling, K Kutak, S Ostapchenko, T Pierog, TC Rogers, MI Strikman, T Sako

Searching for dark matter with CRESST

Proceedings of the 5th Patras Workshop on Axions, WIMPs and WISPs, PATRAS 2009 (2009) 11-15

Authors:

H Kraus, G Angloher, M Bauer, I Bavykina, A Bento, A Brown, C Bucci, C Ciemniak, C Coppi, G Deuter, F Von Feilitzsch, D Hauff, S Henry, P Huff, J Imber, S Ingleby, C Isaila, J Jochum, M Kiefer, M Kimmerle, JC Lanfranchi, RF Lang, B Majorovits, M Malek, R McGowan, VB Mikhailik, E Pantic, F Petricca, S Pfister, W Potzel, F Pröbst, S Roth, K Rottler, C Sailer, K Schäffner, J Schmaler, S Scholl, W Seidel, M Von Sivers, L Stodolsky, C Strandhagen, R Strauss, AJB Tolhurst, I Usherov, W Westphal

Abstract:

The CRESST II experiment is a dark matter search using cryogenic phonon-scintillation detectors, aiming to detect WIMP dark matter particle interactions. The detector consists of individual, modular and scintillating (CaWO4or ZnWO4) target crystals, each equipped with a phonon sensor for precise determination of the energy deposited in the crystals. Each module is further equipped with a separate cryogenic scintillation light detector, allowing event-by-event background discrimination. An extended commissioning run during 2007 has set an upper limit on theWIMP-nucleon scattering cross section. Attention is currently focussed on the interpretation of a few remaining nuclear recoils candidate events.
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Summary

Proceedings of the Workshop - HERA and the LHC: Workshop Series on the Implications of HERA for LHC Physics, HERA-LHC 2006 - 2008 (2009) 628-629

Authors:

A Bunyatyan, A Cooper-Sarkar, C Diaconu, R Engel, C Kiesling, K Kutak, S Ostapchenko, T Pierog, TC Rogers, MI Strikman, T Sako

Working group: Multi-Jet final states and energy flows

Proceedings of the Workshop - HERA and the LHC: Workshop Series on the Implications of HERA for LHC Physics, HERA-LHC 2006 - 2008 (2009) 129-131

Authors:

C Gwenlan, L Lönnblad, E Rodrigues, G Zanderighi, A Bacchetta, A Banfi, S Baranov, J Bartels, A Bunyatyan, V Coco, G Corcella, M Dasgupta, M Deák, PA Delsart, IM Dremin, F Hautmann, S Joseph, H Jung, A Knutsson, K Kutak, A Lipatov, G Luisoni, S Majhi, L Marti, K Müller, T Namsoo, S Osman, H Perrey, G Rodrigo, J Rojo, Z Rúriková, A Sabio Vera, C Sander, T Schörner-Sadenius, F Schwennsen, G Somogyi, G Soyez, M Strikman, M Treccani, D Treleani, Z Trócsányi, BFL Ward, SA Yost, N Zotov

Abstract:

We present a summary of the activities of the Multi-Jet final states and energy flows Working Group of the HERA and the LHC workshop, 2007-2008. Among the more specific topics considered were the status of and recent progress in higher order calculations, both in fixed perturbative expansions and in resummed approaches, recent progress in the description of jets, including the description of forward jets, new calculations performed using kT -factorization and new determinations of unintegrated parton densities.