pl lim

Slide1: 

Heuijin Lim*(ANL), Laurent Schoeffel(Saclay), Mark Strikman(PSU) DIS2006 Diffraction and Vector Mesons WG Diffraction and factorisation H. Lim Exclusive final state L. Schoeffel Saturation M. Strkman Diffractive higgs and LHC LRG Y: leading baryon(p’ or n) or proton dissociative system xL=Ep’,n/Ep IP, IR or p

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Diffraction and factorisation session Leading baryons production ZEUS leading neutron measurement Mara Soares (epeXn, gpXn, gpjjXn) Inclusive diffractive measurements (ep eXp) H1 FPS (99-00) and LRG (97, 99-00) Paul Newman H1 LRG(99-00, 04) and MX method(99-00) Emmanuel Sauvan Hard diffractive measurements H1 diffractive D* and F2(cc) Olaf Behnke diffractive dijet Matthias Mozer ZEUS diffractive D* and dijet Alessio Bonato CDF diffractive measurement Michele Gallinaro Theory of diffractive structure functions Graeme Watt Discussion All

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Leading Neutron Measurement (M. Soares) Fit ds/dpT2 ~ exp(-b pT2) Any models doesn’t describe the data. Db = b(PHP)/b(DIS)  ep  eXN suppressed for PHP b(PHP) b(DIS)

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Data from PT2 < 0.476xL2GeV2 Curves from PT2 < 0.43 xL2 GeV2 Leading Neutron Measurement (M. Soares) epeXn epeXp At xL~0.6-0.8, b (epeXp)~b(epeXn, p exchange) b(epeXn) is dominant for xL > 0.8  Neutron energy spectra in PHP is compatible with effects of absorption (gap survival probability) and migration as predicted by Kaidalov, Khoze, Martin, Ryskin.

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H1 FPS(99-00) and LRG (97, 99-00) (P. Newman) For epeXp (p: tagged by FPS) 2.7≤Q2≤24 GeV2  Fit xIPd2s/dxIPdt ~ exp(Bt) Fitting B~BIP+2a’IPln(1/xIP) a’IP = 0.06+0.19-0.06 GeV-2 BIP = 5.5-2.0+0.7 GeV-2 IR contribution ↑ For epeXY (MY <1.6 GeV) using LRG 3.5≤ Q2≤1600 GeV2  s(MY<1.6 GeV)/s(Y=p) = 1.23 ±0.03(stat.)±0.16(syst.)

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H1 LRG (97, 99-00) and DPDF (P. Newman) Fit LRG data with Q2≥8.5 GeV2, MX<2 GeV, b≤0.8) Parameterise the parton density c2 ~ 158/183 d.o.f., Q02=1.75 GeV2 Due to lack of sensitivity to high z gluon  Fit B : using zg(z,Q02)=Ag c2 ~ 164/184 d.o.f. , Q02=2.5 GeV2 aIP(0)=1.118±0.008(exp.) +0.029-0.010 (theory)

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Diffractive dijet in DIS from H1 (M. Mozer) Fit (F2D+dijets) Fit B (F2D) Fit (F2D) If comparing with dijet from CDF, it will be interesting!

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Diffractive dijet in DIS from ZEUS (A. Bonato) ZEUS LPS(97) H1 2002 fit LRG ZEUS MX(98-99) Reasonable description of data H1 fit2002 and ZEUS-LPS Significant underestimation by GLP fit.  Need to understand the difference from inclusive data sets. (discussion about it later!)

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Diffractive D* from H1 (O. Behnke) and ZEUS (A. Bonato) Diffractive D* in PHP NLO consistent with D* within large error. Diffractive D* in DIS

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CDF diffractive measurement (M. Gallinaro)  Q2 dependence of pomeron evolves like proton  Slope at t=0 is independent on Q2.  From Dijet MC(incl)/Data(incl) From b-tagged jets Fbc/incl/(Fbc/incl(Rjj<0.4)) Events consistent with exclusive dijet production

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CDF diffractive measurement (M. Gallinaro) First

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H1 LRG(99-00, 04) and MX (99-00) (E. Sauvan)  LRG(New data) 6 times more statistics H1(MX) and ZEUS(MX)  No systematic difference! H1 detector: less acceptance in forward region

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Discussion Difference (LRG/MX) for low b and high Q2 Saturation model (CGC..) describes the ZEUS MX measurement, well.  If trying to compare the prediction of CGC with LRG measurement, it maybe gives us the answer because CGC only describes the pomeron exchange.  Due to Reggeon contribution?

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Comparison with colour dipole model, saturation Comparison with Forshaw and Shaw (FS04) model with/without saturation (hep-ph/0411337) and Colour Glass Condensate (CGC) model from Iancu, Itakura, Munier (hep-ph/0310338). Fit F2 and then predict xIPF2(3) F2 F2 FS04(nosat) x CGC FS04(sat) b 1-z z MX  CGC and FS04(sat) are able simultaneously to describe F2 and xIPF2D(3).