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Diffractive Higgs Production at the Tevatron and LHC

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?

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Diffractive Higgs Production at the Tevatron and LHC

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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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