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Summary of the QCD/HFS group

Summary of the QCD/HFS group. S.Chekanov (ANL). J.Terron, M.Sutton, N.Brook (ext.). ZEUS Collaboration Meeting, October 17, 2002. S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002. Group structure. Coordinators : J.Terron, M.Sutton, N.Brook (ext), S.Chekanov DQM: Steven Hanlon

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Summary of the QCD/HFS group

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  1. Summary of the QCD/HFS group S.Chekanov (ANL) J.Terron, M.Sutton, N.Brook (ext.) ZEUS Collaboration Meeting, October 17, 2002 S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  2. Group structure • Coordinators: J.Terron, M.Sutton, N.Brook (ext), S.Chekanov • DQM:Steven Hanlon • Funnel:Andy Ziegler • Trigger:Sabine Lammers Meetings: Every Thursday, 13.30, SR 3 Subgroup meetings: Jets in DIS Wednesday, 16.00 Particle production Monday, 13.00 Instantons Friday, 11.00 S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  3. ICHEP02 papers • | 839 | One- and two-dimensional Bose-Einstein effect L.Zawiejski, K.Olkiewicz, S.Chekanov,M.Derrick • | 843 | Scaling violations in PHP at HERA C.Glasman, A.Lupi • | 845 | Jet production in charged current DIS C.Glasman, M. Vazquez • | 846 | K0s and Lambda production in PHP M.Sutton, S.Boogert • | 848 | Multijet production in DIS N.Krumnack, S. Chekanov, L.Li • | 849 | Multijets in photoproduction C.Gwenlan, M.Sutton, J.Butterworth • | 850 | Inclusive phi (1020) production in DIS S.Chekanov, M.Derrick,B.Levchenko, J.Repond • | 851 | Observation of prompt photons in DIS (not sent) M.Bell, D.Saxon • | 852 | Rapidity gaps in photoproduction C.Gwenlan, M.Sutton • | 853 | Inclusive strange baryons (not sent) A.Ziegler, B.Levchenko • | 855 | Inclusive jet cross sections in neutral current DIS O.Gonzalez, J.Terron, H.Raach • | 854 | Virtual-photon structure from dijets production A.Lupi, D.Kcira, H.Labes • | 857 | Dijets in PHP and the photon structure (published) M.Wing, E.Heaphy, J.Terron, A.Ochs, J.Butterworth • | 858 | High-mass dijets in photoproduction (published) C.Glasman, J.Terron • | 859 | Dijet production in neutral current DIS (published) D.Chapin, M.Przybycien, C.Foudas, M.Wing 13 papers sent, 6 papers contain completely new results S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  4. Jets in PHP   P P Scaling violation and determination 1st EB C.Glasman, A.Lupi C.Gwenlan, M.Sutton Rapidity gaps in PHP ICHEP02 C.Gwenlan,M.Sutton, J.Butterworth Multijets in PHP ICHEP02 M.Kowal Work on cross sections and improvements of MC statistics S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  5. Jets in PHP New additions after ICHEP02 S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  6. Jets in PHP: rapidity gaps New results for ICHEP02 (M.Sutton, C.Gwenlan) HERWIG gives better description of the data than PYHIA Large difference between HERWIG and PYTHIA without color singlet exchange This precludes definite conclusions…

  7. Hard QCD at low * *   P P A.Lupi, D.Kcira,H.Labes: Low dijets and the photon structure 1st EB Anna has left the group, thanks for her effort to finish this paper! S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  8. Hard QCD at high G.Glasman, A.Lupi, Jets in PHP E T *  O.Gonzalez, H.Reach, J.Terron Inclusive jets and determination accepted for publication sent Azimuthal asymmetry from inclusive jets S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  9. Hard QCD at high E T *  TEVATRON S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  10. Hard QCD jets in CC DIS E M.Vazquez, C.Glasman: Inclusive jets and dijets in CC DIS T +/- W Paper draft is available M.Vazquez Paper presentation Separation of quark and gluon jets in NC DIS N.Brook, T.Namsoo: apply a neural-net approach to study jets S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  11. Azimuthal asymmetry in DIS T.Tymieniecka, A.Ukleja: Azimuthal asymmetry in DIS Energy-flow method Look at average angles Use ZUFOs Increase statistics using 99/00 data S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  12. Multi-jet Production in DIS P N.Krumnack, L.Lee, S.Chekanov : Exclusive multijets in DIS ICHEP02 L.Lee, N.Krumnack : dependence for 3/2 -jet ratio A.Morgan, S.Chekanov: and dependence for 1-4 jets Nils Krumnack Presentation S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  13. Prompt photons in DIS NLO QCD: M.Bell, D.Saxon: Prompt photons in DIS New preliminary J.Hamilton, P.Bussey: Prompt photons in PHP S.Magill, B.Musgrave: work on the signal/background ratio using BPRE S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  14. Forward jets and low-x physics S.Lammers, J.Terron, S.Magill: Dijets at low S.Lammers Presentation A. Benen: Jet production in DIS with FPC Presentation A.Benen Search for instantons in DIS S Hillert, B.Levchenko, A. Barakbaev Presentation S.Hillert S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  15. Interplay between hard and soft QCD Hadronisation (higher - order pQCD effects?) C. McCance, I.Skillicorn, P.Bussey: Event shapes in DIS Paper reading October 15 S.Hanlon: has started the analysis with the new 99/00 data W.Yan: will join soon S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  16. Using soft physics to study hard QCD S F(1020) B.Levchenko, J.Repond, M.Derrick, S.Chekanov: Observation of the strange sea via phi(1020) Post-reading version S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  17. Strange particle production in DIS and PHP A.Ziegler, Z.Ren, J.Lainesse: Cascade and Sigma production in DIS L Presentation K0 S.Paganis, M.Barbi, A.Raval: K0sK0s production in DIS s Presentation Paper draft for the group very soon Ar.Ziegler, M.Barbi, A.Raval: Strange particle production (K0s, Lambda) in inclusive DIS Presentation M.Sutton, S.Boogert: K0s and Lambda in PHP ICHEP02 S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  18. The final step in the particle production L.Zawiejski, K.Olkiewicz, M.Derrick, S.Chekanov 1D and 2D BE effect in DIS BEC radius is independent of BEC is longitudinally elongated BPC data point for the final paper Paper draft for the group very soon S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  19. More data is needed The mainstream of the studies is to increase statistics and to decrease systematics Studies suffering from too low statistics: High-Et cross sections in DIS/PHP (Et>40 GeV) Multi-jet production (Et>10 GeV for 3rd jet) High-Pt strange mesons (for most interesting phase-space regions) K0s K0s studies in DIS 2D and 3D BE effects (no statistics for the measurement!) Prompt photons in DIS (very low statistics everywhere!) More differential jet studies require better statistics S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  20. What new components can be used MVD An improvement in the reconstruction of ? STT Strange baryons and mesons in the forward region Charged multiplicities in the forward Fragmentation functions in the target fragmentation region Possible improvement for ZUFOs reconstruction for jet physics S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

  21. What data we need CAL + CTD, HV 100% CAL + CTD, HV 90% (for vertex) CAL + MVD (for vertex) • High-luminosity data is not expected (with CTD HV 100%); • Low-luminosity data has no significant impact on the future measurements; • No much time left before the shutdown So far there was no much interest in this data We need to investigate the potential of new components(MVD/STT) as soon as possible! Please join! S.Chekanov (ANL), ZEUS Collaboration Meeting, Oct 2002

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