K. Goulianos The Rockefeller University (Representing the CDF Collaboration) DIS 2005 27 April – 1 May Madison, Wisconsin Update on CDF Results on Diffraction.

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Presentation transcript:

K. Goulianos The Rockefeller University (Representing the CDF Collaboration) DIS April – 1 May Madison, Wisconsin Update on CDF Results on Diffraction

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos2 - p Interactions Diffractive: vacuum exchange Protons retain their quantum numbers Non-diffractive: color exchange Protons acquire color and break apart Goal: understand the nature of the colorless exchange

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos3 CDF Run 1-0 ( ) Elastic, single diffractive, and total cross 546 and 1800 GeV Roman Pot Spectrometers Roman Pot Detectors  Scintillation trigger counters  Wire chamber  Double-sided silicon strip detector Results  Total cross section  tot ~ s   Elastic cross section d  /dt ~ exp[2  ’ ln s ]  shrinking forward peak  Single diffraction Breakdown of Regge factorization Additional Detectors Trackers up to |  | = 7

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos4 Run 1-0 results in perspective KG, PLB 358 (1995) 379

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos5 CDF Run 1 ( ) Run-IC Run-IA,B Forward Detectors BBC 3.2<  <5.9 FCAL 2.4<  <4.2

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos6 CDF in Run I 93(2004)141601

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos7 All ratios ~ 1%  ~ uniform suppression ~ FACTORIZATION Diffractive CDF 1.45 (0.25)J/  0.62 (0.25)b 0.75 (0.10)JJ 1.15 (0.55)W Fraction(%) Hd Fraction: SD/ND ratio at 1800 GeV

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos8 R(SD/ND) vs x Bj <  < Flat  dependence

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos9 Tevatron vs HERA: Breakdown of QCD Factorization CDF H1

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos10 Restoring Factorization R(SD/ND) R(DPE/SD) The diffractive structure function measured on the proton side in events with a leading antiproton is NOT suppressed relative to predictions based on DDIS

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos11 Run 2 Diffractive Program  Single Diffraction   and Q 2 dependence of F jj D  Process dependence of F D (W, J/   Double Diffraction  Jet-Gap-Jet:  gap for fixed large  jet  Double Pomeron Exchange  F jj D on p-side vs  -pbar Also: Exclusive central production  Dijets,  c Other  Tev4LHC issues

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos12 SD and ND collisions ND SD Particle density Energy flow

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos13 CDF-II ROMAN POT DETECTORS BEAM SHOWER COUNTERS: Used to reject ND events MINIPLUG CALORIMETER

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos14 Artist’s View of MiniPlug 25 in 5.5 in 84 towers

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos15 ADC counts in MiniPlug towers in a pbar-p event at 1960 GeV. “jet” indicates an energy cluster and may be just a hadron. Multiplicity distribution in SD and ND events MiniPlug tower structure MiniPlug Run II Data

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos16 Diffractive Structure Function

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos17 Diffractive Dijet Sample overlap events

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos18  RP vs  cal overlap events signal region  cal distribution for slice of  RP  cal = (0.94 ± 0.03)  RP  /mean ~ 30%

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos19 R jj Ratio of SD/ND dijet event rates  agreement with Run 1 result  no  dependence in 0.03<  <0.1  confirms Run I results x10 x0.1 No appreciable Q 2 dependence in region 100 < Q 2 < 1,600 GeV 2  Pomeron evolves as proton MORE DATA CURRENTLY AT HAND

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos20 F jj low  Measure  -dependence of Fjj( ,t) down to  ~0.001 using gap trigger STATUS: Data at hand Analysis in progress

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos21 Diffractive W production Probes the quark content of the Pomeron  More direct comparison with HERA hard-gluon dominated Pomeron (rate lower by  s ) hard-quark dominated Pomeron Run I: 8,246 W(ev) events - PRL 78 (1997), 2698 R W (SD/ND) = 1.15 ± 0.51(stat) ± 0.20(syst) % W p p p P Status: data at hand, analysis in progress W p p p P

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos22 Gap Between Jets Question Is the diffractive exchange BFKL-like or simply a color rearrangement? Work in progress: low luminosity run needed

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos23 Exclusive Dijet Production H Use dijet rate to calibrate Higgs production calculations Khoze, Martin, Ryskin: Eur. Phys. J. C23, 311 (2002); C25,391 (2002);C26, 229 (2002) Boonekamp, Peschanski, Royon: PRL 87, (2001)

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos24 Exclusive Dijets in Run 1 not detected Exclusive dijet limit:  jj (excl.) < 3.7 nb (95% CL) Dijet Mass fraction Expected shape of signal events Theoretical expectation (KMR) ~1 nb PRL 85 (2000) 4215 MxMx

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos25 Run 2 dijet mass fraction Minimum E T (Jet1)Cross section (R jj >0.8) 10 GeV 1.1 ± 0.1(stat) ± 0.5(syst) nb 25 GeV25 ± 3(stat) ± 10(syst) pb exclusive?

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos26 Exclusive Dijet Events ? R jj =0.36 R jj =0.81 E T jet1(2) = 33(31) GeV E T jet1(2) = 36(33) GeV

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos27 Limits on Exclusive production Martin, Kaidalov, Khoze, Ryskin, Stirling hep-ph/ ): ~ 40 pb (E T >25 GeV) (factor ~2 uncertainty)

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos28 Theory: J Z = 0 spin selection rule gg → gg dominant contribution at LO gg → qq suppressed when M jj >> m q Heavy flavor exclusive dijets Experimental method: normalize R jj (qq) to R jj (all jets)  look for suppression at large R jj Pros:many systematics cancel out good HF quark id small g mistag O(1%) Cons:heavy quark mass: suppression is not complete illustration

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos29 Heavy flavor tagged dijet fraction R btag (R jj >0.7)/R btag (R jj <0.4)=0.59 ± 0.33 (stat) ± 0.23 (syst) exclusive production? need: to compare with MC more data !

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos30 Exclusive  C cc STATUS: data from new gap + J/  + gap trigger are being analyzed Cross section upper limit:  excl (J/  ) = 49 ± 18(stat) ± 39(syst) pb Khoze, Martin, Ryskin, and Stirling ~ 70 pb [Eur. Phys. J. C 35, 211 (2004)] From inclusive J/  data:

DIS 2005, 27 April – 1 MayNew CDF Results on Diffraction K. Goulianos31 CONCLUSION Run 2  CDF has a comprehensive Run 2 diffractive program  Data at hand are being analyzed  More data are being collected  Proposal for low luminosity (~10 30 ) run under study Beyond Run 2  Tev4LHC studies