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Diffractive Higgs Production at the Tevatron and LHC: A Workshop Overview

This document summarizes the findings and discussions from the workshop on low-x physics held in Antwerp in 2002, focusing on diffractive Higgs production at the Tevatron and LHC. Key topics include the sensitivity of predictions to pomeron trajectory parameters, methods to check LHC predictions during Run II, and the effectiveness of the POMWIG model using measured structure functions. The results from CDF and comparisons with theoretical predictions underline the need for clearer understanding and observation of exclusive contributions in dijet production.

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Diffractive Higgs Production at the Tevatron and LHC: A Workshop Overview

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  1. Diffractive Higgs Production at the Tevatron and LHC Workshop on low x physics, Antwerp 2002 Brian Cox, Jeff Forshaw and Beate Heinemann Phys. Lett. B 540 (2002) 263-268 • Do we all disagree, and, if so, why? • How sensitive are the predictions to the parameters of the pomeron trajectory? • Can we check the LHC predictions in Run II? http://www.pomwig.com

  2. WHAT IS POMWIG ? • No doubt that Ingelman – Schlein works at HERA • Pomwig uses measured structure functions and flux from H1 OR user defined structure functions / flux PLUS all HERWIG hard sub-processes / hadronisation etc.

  3. What do we calculate? “Inclusive” (Central-inelastic) process p+p p + gap + H + X + gap + p Khoze, Martin & Ryskin, hep-ph/0207313

  4. What do we calculate?

  5. Enberg ~ 2 fb Results CDF measured   44  20 nb S2 = 0.1 S2 ~ 0.02 s ~6fb

  6. Higgs cross sections IP + IR, IP= 1.20, IR=0.57 (POMWIG defaults),  0.1 MH = 115 GeV

  7. What effect does the intercept have? H1 fit 2

  8. S2 = 0.02 fb fb Are these diagrams as large a contribution as KMR calculate? S2 = 0.1 (CDF data) Theory: S2 = 0.05 Khoze, Martin & Ryskin, hep-ph/0207313

  9. Can we see the exclusive contribution in the data? POMWIG does well at differential distributions Appleby & Forshaw, Phys.Lett.B451 108-114 (2002) Mass dist. similar (KMR hep-ph/0207313) Exclusive limit ~ 3.7 nbCDF Phys. Rev. Lett 85 4215 (2000) Exclusive calculation~ 1 nb (Khoze, Martin & Ryskin, hep-ph/0111078, 0006005)

  10. Exclusive vs. C.inel IP+IR IP+IR IP IP • Cross section depends critically on invariant mass of diffractive system (and available phase space for emission) consistent with CDF data CDF cuts: 0.035 <  < 0.095 0.01 <  < 0.03 KMR cuts: Dh < 2

  11. fb fb Summary • KMR and CFH agree, but CFH miss out LO piece, accounted for by larger gap survival factor • BDPR very large – can’t be accounted for by lower IP intercept • crucial (and possible) to observe exclusive dijet production in different mass ranges (~1 nb ET > 7 GeV) at Run II to check these conclusions.

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