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Diffraction Studies at TeV I

Diffraction Studies at TeV I. Sharon Hagopian Florida State University for the D0 and CDF Collaborations Rencontre de Physique de Vallee d’Aoste La Thuile, March 5, 1998. 630 GeV Multiplicities. Require 1 gap w/ 2.5 < | h | < 5.2 Plot detector multiplicity in

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Diffraction Studies at TeV I

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  1. Diffraction Studies at TeV I Sharon Hagopian Florida State University for the D0 and CDF Collaborations Rencontre de Physique de Vallee d’Aoste La Thuile, March 5, 1998

  2. 630 GeV Multiplicities Require 1 gap w/ 2.5 < |h| < 5.2 Plot detector multiplicity in same region on opposite side 630 GeV ET Distributions Double gap events vs. single gap and inclusive events w/ 2 leading jets > 12 GeV, |h_jet| < 1.0

  3. 630 GeV Multiplicities Require 1 gap w/ 2.5 < |h| < 5.2 Plot detector multiplicity in same region on opposite side D0 Preliminary 630 GeV ET Distributions Double gap events vs. single gap and inclusive events w/ 2 leading jets > 12 GeV, |h_jet| < 1.0

  4. Event Ratios (630 GeV only) • Let = fraction of POT events • in f, t BIN • (~0.5 mb) • (0.05-0.10) <0.20@630 • …which have ³ 2 jets above 7 GeV • Let = fraction of MB events • with 2 ³ JETS > 7GeV stat stat

  5. If 150-200 Gev pp collisions were as likely to have ³ 7 GeV JETS as 1500GeVpp, • would = • [Also ~ 10% GeV/1800 Gev]

  6. Hard Double Pomeron Exchange Gap Gap Studying · collisions gives an extra process to gain insight into nature of pomeron CDF: Demand track (0.05 < x < 0.1), 2 jets ET > 7 GeV measure multiplicity on opposite side D0: Demand gap on one side, 2 jets ET > 12, |h|<1 measure multiplicity on opposite side D0 Measure GAP multiplicity CDF here x= 1- x (fraction of momentum lost by the proton and carried by the pomeron)

  7. Color-Singlet Studies QCD color-singlet signal observed in ~ 1 % opposite-side events. f Dh jet jet h Publications DØ: PRL 72, 2332(1994) CDF: PRL 74, 885 (1995) DØ: PRL 76, 734 (1996) Zeus: Phys Lett B369, 55 (1996) • New Results • Color-Singlet fractions at • s = 630 & 1800 GeV • Color-Singlet Dependence on: • Dh, ET, s • (parton-x)

  8. Recent measurements of hard diffraction process - rates, h and Et dependencies, and comparisons with MC models • Help us to understand the nature of diffraction (the POMERON) and how diffraction fits into QCD • Large and luminosity at Tevatron allows probing of hard diffraction (hard scattering in events with Rapidity Gaps) TEVATRON HERA

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