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A summary of

A summary of. ICHEP.

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A summary of

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  1. A summary of

  2. ICHEP • The French particle physics community is particularly proud to have been selected to host the 35th ICHEP conference in 2010 in Paris. This conference is the focal point of all our field since more than fifty years and is the reference event where all important results in particle physics, cosmology and astroparticles are presented and discussed. This alone sufficed to make this event very important. But in 2010, a coincidence of exceptional events made this conference even more attractive! What is then so special about ICHEP 2010 conference? It was the first ICHEP conference where physics results obtained at the LHC were presented! New results about the elusive Higgs boson, or signals of physics beyond the standard model were therefore expected at this conference! Major discoveries in other domains such as gravitational waves, neutrino telescopes, neutrino oscillations, dark matter or in the flavour sector were also possible, just to name a few.In addition , 2010 is an important date to shape up the future of our field. Several major projects presented the status of their Conceptual or Engineering Design Reports during the conference. The International Linear Collider (ILC) Global Design Effort team presented the report corresponding to the end of their Technical Design Phase 1. The Compact Linear Collider (CLIC) also reported on its Conceptual Design Report. Other major projects such as Super B factories were also presented. These reports together with LHC physics results will form the basis for key political decisions needed to be taken in the years to come.In summary, there can be no doubt that Paris was the place to be in summer 2010 for anyone interested in High Energy Physics and we made every effort to make your stay as interesting and enjoyable as possible. Javier Castillo

  3. ICHEP 2010 That was us, one day out of 3, plus 3 plenary talks http://www.ichep2010.fr/ Javier Castillo

  4. Lesson #1 • If you are interested in Heavy Ion Physics do not go to ICHEP! Thanks for your attention! Javier Castillo

  5. Lesson #2 • If you don’t speak a fluent pythia, do not go to ICHEP! Javier Castillo

  6. Lesson #3 ALLOCUTION DE M. LE PRÉSIDENT DE LA RÉPUBLIQUE Palais des Congrès de Paris -- Lundi 26 juillet 2010 Madame le Ministre, Mesdames et Messieurs, Je suis très heureux de pouvoir m'exprimer devant votre assemblée réunie pour la 35ème conférence internationale de la physique des hautes énergies. Vous êtes venus partager vos travaux, vous représentez l'élite de votre discipline au niveau mondial. Et quelle discipline ! Je ne me lancerai certes pas dans la description détaillée de vos travaux, j'en serais bien incapable, même si je sais à quel point vous incarnez l'essence de la science, son ambition première : repousser les frontières de la connaissance, explorer et cartographier des territoires encore inconnus de la pensée. Il n'y a pas de plus belle aventure humaine que celle que vous vivez au quotidien. Javier Castillo

  7. Outline • The underlying event (what we call minbias) • LHC • Heavy Flavour and Quarkonia • RHIC & LHC • Jets • RHIC Javier Castillo

  8. Off topic – featured guest! DIE HARD! Strangeness enhancement NA49 data. Filled symbols are central trigger Open symbols STAR Open symbols NA57 Compare to NA57 Compare to STAR T. Anticic 8/15 Javier Castillo

  9. THE UNDERLYING EVENT (WE CALL IT MINBIAS) Javier Castillo

  10. Charged particle multiplicity arXiv:1004.3514[hep-ph] • INEL and NSD events in |h|<0.5 • INEL>1 at least 1 charged particle in |h|<1 • increase from 0.9 to 7 TeV ~ 57% • above Monte Carlo model predictions M. López Noriega K. Ulmer Javier Castillo

  11. Transverse momentum spectra A. Lister Javier Castillo

  12. p/p ratio arXiv:1006.5432v1 [hep-ex], accepted for publ. by PRL • p/p ratio shows no pT (and no rapidity) dependence • small excess of baryons over antibaryons (asymmetry of ~1.9%) at 900 GeV • ratio consistent with 1 at 7 TeV, compatible with net-baryon free region M. López Noriega I. Belikov Javier Castillo

  13. Strangeness |h| < 1 • very good agreement between STAR (200 GeV) and ALICE (900 GeV) • very different from CDF (630/1800) and UA1 (630) for pT > 1.5 GeV • - UA1(630) and CDF(630) don’t agree either … • to be further investigated (different triggers, acceptance, feed-down correction ?) Do you remember: large Baryon/Meson ratio at RHIC: parton coalescence from QGP ? K. Ulmer J. Schukraft Javier Castillo

  14. HEAVY FLAVOUR & QUARKONIA Javier Castillo

  15. J/ψ polarization • no model explains cross section and polarization simultaneously • many models on the market • Color Singlet Model: LO, NLO, NNLO • Color Octet Mechanism: NRQCD... many more λ>0 transverse λ<0 longitudinal Helicity frame L. Levy Javier Castillo

  16. CNM Effects arXiv:0912.4498 Ask Elena about this one! NDSG σ = 0,1,2,3,4,…15 R. Vogt private communication EPS08 σ = 0 mb σ = 4 mb L. Levy Javier Castillo

  17. ϒ CNM RdA = 0.78 ± 0.28(stat.) ± 0.20(sys.) L. Levy D. Kikola Javier Castillo

  18. More J/ψ mess • No suppression at high pT • RAA(pT > 5 GeV/c) = 1.4 ± 0.4 ± 0.2 Disagreement at high pT L. Levy D. Kikola Javier Castillo

  19. ϒ RAA Au+Au |y|< 0.35 RAA < 0.64 at 90% CL for Upsilon at RHIC. Who dared to quote it? PHENIX or STAR L. Levy D. Kikola Javier Castillo

  20. Quarkonia @ LHC C. Lourenço @ Palaiseau 2010 J. Castillo G. Passaleva N. Leonardo J. Kirk Javier Castillo

  21. b cross-section NLO underestimates the cross-section at central η and low pT (very low pT!) A. Golutvin S. Bolognesi Javier Castillo

  22. Open Charm Ds+ → Φ π+ → (K+ K-)π+ Javier Castillo

  23. JETS Javier Castillo

  24. gamma – jets STAR Preliminary arXiv:0912.1871 • Away-side -h: • suppression similar to both RAA and IAA • similar path as RAA • quark jet dominated • rich sample has lower near-side yields compared to those of the 0 •  different bias • Similar medium effect on the away-side of 0 and dir •  is this due to tangential emission? O. Evdokimov C. Pinkenburg Javier Castillo

  25. Fragmentation function • Away-side -h: • fragmentation function somewhat steeper than p+p (only 1.3σ significance • bpp consistent with quark fragmentation (b=8) dN/dzT =Ne−bzT bpp= 6.89 ± 0.64 bAuAu= 9.49 ± 1.37 O. Evdokimov C. Pinkenburg Javier Castillo

  26. Jet-hadron correlations We see significant Jet suppression in CuCu Jet RAA is comparable to p0 RAA • Au+Au vs. pp: • Softer momentum distribution for recoil hadrons • Significant away-side broadening 1.0<pTassoc<2.5 GeV/c • 0-20% Au+Au • pp STAR Preliminary STAR Preliminary flat BG subtraction STAR Preliminary O. Evdokimov C. Pinkenburg Javier Castillo

  27. Conclusion • RHIC • Extensive and detailed studies are being performed • LHC • First results are coming fast Javier Castillo

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