Stephen Maxfield 11 Summary of the Experimental Talks Photon2007 Stephen Maxfield (Liverpool) Stephen Maxfield 22 ~70 Talks many of which were themselves summaries of several analyses. So Obviously impossible to cover everything Apologies to speakers and contributors of the talks not mentioned Choices are idiosyncratic! and apologies for any misrepresentation of those included! Stephen Maxfield 3 Diffractive processes Stephen Maxfield 4 Experimental tests of factorisation in diffraction exchange Extract parton densities from inclusive diffraction L. Schoeffel Stephen Maxfield 5 But fails to predict tevatron data Factorisaton breaking or gap suppression from spectator parton interactions? Events with leading anti-proton use ratio DPE/SD instead of SD/ND Agreement with HERA prediction. Stephen Maxfield 6 Dijet production DIS vs. Photoproduction S.Schaetzel In DIS dijets and Charm consistent with factorisation. Stephen Maxfield 7 Charm still OK But Stephen Maxfield 8 Factorisation broken but in odd way! Stephen Maxfield 9 Role of multi-parton interactions Stephen Maxfield 10 Albert Knutsson Photoproduction of 3 and 4 jet events at HERA Stephen Maxfield 11 needed in DIS?Albert Knutsson Stephen Maxfield 12 but still not described. Pythia tuning? Stephen Maxfield 13 Photons in the final state Stephen Maxfield 14 Prompt photons from HERA. In Photoproduction and DIS Constrains gluon NLO calculations: Stephen Maxfield 15 Stephen Maxfield 16 Experimentally challenging final state. Needs very good understanding of the detector c.f. Tevatron: Stephen Maxfield 17 Nikolay Skachkov Great care taken with Photon ID Isolated +jets triple differential Cross section D0 Stephen Maxfield 18 High statistics measurement, 5 orders of magnitude, good qualitative description by NLO Stephen Maxfield 19 but deviations from NLO predictions seen. (i.e.with forward jet) Stephen Maxfield 20 photons in A+A direct photonsdecay photons hardthermaljet-plasma-interact. QGPhadron gasdirectfragmentation pre-equilibrium jet- - conv. medium-induc. bremsstr. and RHIC Henner Buesching Leading Particle Direct Hadrons g q frag. Nuclear modification factor Stephen Maxfield 21 and at LHC Valeria Perez Reale Main interest H but also very high p t final states G Excellent understanding of calorimetry/tracking will be needed to understand fake rates Stephen Maxfield 22 Wheres the physics? still in the traditional places: Stephen Maxfield 23 Resonances and Exclusive Processes Belle S.Uehara Fit to lineshape: Also look Note huge statistics! so not conclusive Stephen Maxfield 24..and LEP B-tagging by signed impact parameter. Use to calculate probabilities that tracks come from main vertex. Iterative Discriminant Analysis A. Finch Stephen Maxfield 25 Ultra-peripheral Collisions: Very strong Electric field: Short pulse: but also more exotic places Joakim Nystrand Stephen Maxfield 26 Very low p T e + e - in STAR at RHICJanet Seger and much much more. See also talks from e.g: Joakim Nystrand: RHIC and ALICE David DEnterria: RHIC and CMS Stephen Maxfield 27 high p T jets Events with two jets within pseudorapidity 2.7 and transverse energy more than 3 GeV selected by K T -clustering algorithm Background coming from peripheral HI collisions is estimated to be few percents Expected statistics of one-week running (around ten thousands events) is enough to make a comparison with QCD-based calculations V. PodznyakovLHC with Pb-Pb Stephen Maxfield 28 More Charm and Beauty Stephen Maxfield 29 Charm and Beauty Stephen Maxfield 30 Stephen Maxfield 31 Photoproduction of Heavy Quarks at HERA John Loizides NLO QCD underestimates data? Results on: e.g. Stephen Maxfield 32 not necessarilybest choice of scale? According to Achim Geiser: Time to resurrect some old ideas! Scale choice best done on case by case basis but Usual recipe central value natural scale; vary by factor 2, . Better might be: NLO = LO => hope: NNLO = NLO or d /d = 0 => hope: minimize NLO corrections NNLO now exists in some cases so can test Stephen Maxfield 33 standard scale range proposed new default NLO (NNLO) QCD survey of: - beauty at SppS, Tevatron, HERA-B - top at Tevatron - Z, H at LHC m p T - jets in p and at Tevatron E T 0 /2 < < 2 0 0 /4 < < 0 1/4 1/21 2 Stephen Maxfield 34 thanks to E. Nuncio- Quiroz new scale (preliminary) 0 /2 < < 2 0 and new recipe may also apply in numerous other places Stephen Maxfield 35 Charm and Beauty in DIS (Forward low p t ) M.Boenig Stephen Maxfield 36 Stephen Maxfield 37 Stephen Maxfield 38 Proton Structure: not at all the end of a (H)era Stephen Maxfield 39 E. Perez Many measurements now incorporated into fits. See talk for details. A couple that were talked about here Stephen Maxfield 40 HERA jet data has reduced the gluon uncertainty Jimenez Stephen Maxfield 41 Constraints from Tevatron Data A. Kupco e.g. from inclusive High p t jets and W,Z N.B. x10 statistics to come M. Lancaster Stephen Maxfield 42 F L to come shortly Alexey Petrukhin Stephen Maxfield 43 Talks from M.Stolarski, D. Reggiani, C; Schill e.g. And theres beautiful data on the spin dependent structure functions Handle on polarised sea Non-symmetric favoured Stephen Maxfield 44 Finally Wheres the virtual photon structure? Paris 21 years ago! Stephen Maxfield 45 Resolved * and NLO QCD G. Grindhammer NLO predictions generally do well in DIS: Or where another hard scale Stephen Maxfield 46 Forward 0 production but generally situation complicated: HO, k T factorisation etc. Scale choice etc. Stephen Maxfield 47 and meanwhile Ken Sasaki and colaborators have been busy! Maybe have to wait for ILC Stephen Maxfield 48 Conclusions Stephen Maxfield 49 CDFJ. Pinfold p p g g g dijet, , c Exclusive Study standard candle For exclusive Higgs production dont always need a lot of or in events for a significant result Stephen Maxfield 50 Stephen Maxfield 51 Nicked from Guenter