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New Results on Diffractive and Exclusive Production from CDF

New Results on Diffractive and Exclusive Production from CDF. Konstantin Goulianos The Rockefeller University (for the CDF Collaboration). http://physics.rockefeller.edu/dino/my.html. http://dis2013.in2p3.fr /. CONTENTS. Introduction Diffraction in QCD Diffraction at CDF Definitions

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New Results on Diffractive and Exclusive Production from CDF

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  1. New Results on Diffractive and Exclusive Production from CDF Konstantin Goulianos The Rockefeller University (for the CDF Collaboration) http://physics.rockefeller.edu/dino/my.html http://dis2013.in2p3.fr/ Diffractive and Exclusive Production at CDF K. Goulianos

  2. CONTENTS • Introduction • Diffraction in QCD • Diffraction at CDF • Definitions • Factorization breaking in soft diffraction • Exclusive production of: • dijet-2008, dimuoncc-J/y(2s)-2009, gg-2012 • Central Exclusive Production of p+p-NEW! Diffractive and Exclusive Production at CDF K. Goulianos

  3. p POMERON DIFFRACTION IN QCD • Non-diffractive events • color-exchange  h-gaps exponentially suppressed • Diffractive events • Colorless vacuum exchange •  h-gaps not suppressed rapidity gap p p p p Goal: probe the QCD nature of the diffractive exchange Diffractive and Exclusive Production at CDF K. Goulianos

  4. SDD DIFFRACTION AT CDF sT=Im fel (t=0) Elastic scattering Total cross section OPTICAL THEOREM gap f f h h DD SD DPE/CD Single Diffraction or Single Dissociation Double Diffraction or Double Dissociation Double Pom. Exchange or Central Dissociation Single + Double Diffraction (SDD) exclusive JJ…ee…mm...gg p p JJ, b, J/y,W Diffractive and Exclusive Production at CDF K. Goulianos

  5. MX DEFINITIONS SINGLE DIFFRACTION x,t xp p’ p p MX Forward momentum loss p’ dN/dh rap-gap Dh=-lnx 0 ln Mx2 ln s ln s since no radiation no price paid for increasingdiffractive-gap width Diffractive and Exclusive Production at CDF K. Goulianos

  6. p’ p x,t p M 540 GeV 1800 GeV see KG, PLB 358, 379 (1995) FACTORIZATION BREAKING IN SOFT DIFFRACTION diffractive x-section suppressed relative to Regge prediction as √s increases Regge Factor of ~8 (~5) suppression at √s = 1800 (540) GeV RENORMALIZATION CDF Interpret flux as gap formation probability that saturates when it reaches unity √s=22 GeV Diffractive and Exclusive Production at CDF K. Goulianos

  7. EXCLUSIVE Dijet Excl. HiggsTHEORY CALIBRATION JJ cc PRD 77, 052004 (2008) PRL 102 , 242001 (2009) _ p Exclusive dijets } p Diffractive and Exclusive Production at CDF K. Goulianos

  8. Exclusive dimuon production Exclusive cc PRL 102, 242001 (2009) _ _ p+p→p++-+p 3 GeV/c2 <M<4 GeV/c2 • Several physics processes in this dataset: Diffractive and Exclusive Production at CDF K. Goulianos

  9. J/y 286 352 = +66 events Y(2s) 3940 = +1 event Exclusive c→J/(→+-)+ Exclusive cc PRL 102, 242001 (2009) • Allowing EM towers (ET >80MeV) • large increase in the J/ypeak & minor change in the y(2s) peak •  Evidence for: • c→J/+production Allow extra EM tower • d/dy|y=0 = 75 ± 14 nb, • compatible with theoretical predictions • 160 nb (Yuan 01) • 90 nb (KMR01) Diffractive and Exclusive Production at CDF K. Goulianos

  10. Exclusive J/ and y(2s) Exclusive cc J/producton 243 21 events d/dy|y=0= 3.92± 0.62 nb Theoretical Predictions 2.8 nb [Szczurek07,], 2.7 nb [Klein&Nystrand04], 3.0 nb [Conclaves&Machado05], and 3.4 nb [Motkya&Watt08]. Y(2s) production 347 events d/dy|y=0 = 0.54 ± 0.15 nb R = (2s)/J/= 0.14 ± 0.05 In agreement with HERA: R = 0.166 ± 0.012 in a similar kinematic region J/ (2s) QED continuum Diffractive and Exclusive Production at CDF K. Goulianos

  11. Exclusive gg production-2012 PRL 108, 081801 (2012) Diffractive and Exclusive Production at CDF K. Goulianos

  12. Exclusive gg and e+e- events Diffractive and Exclusive Production at CDF K. Goulianos

  13. Exclusive gg data vs MC Diffractive and Exclusive Production at CDF K. Goulianos

  14. Exclusive gg cross section Diffractive and Exclusive Production at CDF K. Goulianos 14

  15. Exclusive gg event candidate Diffractive and Exclusive Production at CDF K. Goulianos

  16. Central Exclusive Poroduction of p+p- DETECTOR NOT USED use only |h|=5.4-5.9 NOT UED Diffractive and Exclusive Production at CDF K. Goulianos

  17. Central Exclusive Production of p+p- NEW DATA • TRIGGERS • Two Central Calorimeter towers (|h|<1.3) w/E≥0.5 GeV (a very low threshold) and no energy in BSC (|h|=5.4-5.9) and in the Forward Plug Calorimeters (|h|=2.11-3.64 ). • “zero-bias” bunch crossing events with no tracks  to study noise/exclusivity cuts. • DATA SETS • Recorded 90(22)×106 events at√s=1960 (900) GeV. • PRELIMINARY RESULTS • |y(p+p-)|<1.0, Mp+p-<0.8 where there is some acceptance at all pT. • Notice: no particle ID is (yet) being used and the observed tracks are assumed to be due to pions (until further notice – stay tuned!). Diffractive and Exclusive Production at CDF K. Goulianos

  18. “Empty” events  detector noise levels • Empty-event selection • Select region of bunch luminosity with low overlaps and high yied • Detector noise levels: • Determined separately for interaction and no-interaction events • Rejected “noise” events below vertical dashed lines use data only here Diffractive and Exclusive Production at CDF K. Goulianos

  19. Mp+p-distributions at 1960 GeV • not-corrected for acceptance • we clearly see f0(980), f2(1270) and f0(1370). • the small but significant peak at 3.1 GeV is understood to be from J/ye+e- with masses assumed as mp+mp-. • corrected for acceptance Diffractive and Exclusive Production at CDF K. Goulianos

  20. Event ratio of 1960/900 GeV and average PT at 1960 GeV • Ratio of candidates at √s=1960/900 GeV vs M(pair)  • Mean pT(pair) in GeV/c as a function of M(pair) •  Diffractive and Exclusive Production at CDF K. Goulianos

  21. Comparisons of ds/dMp+p- events per bin • The structures observed in the mass region of less than ≈1 GeV are under investigation. Diffractive and Exclusive Production at CDF K. Goulianos

  22. SUMMARY • Reviewed briefly exclusive production at CDF. • Measured exclusive p+p- production (no particle ID yet, tracks assumed to be due to pions) at √s=900 GeV and √s=1960 GeV with higher statistics than in earlier studies. • Explored the low mass region: found well known structures from AFS at ISR at √s=63 GeV for Mp+p- < 1.5 GeV, and also features that are not yet understood for Mp+p- > 1.5 GeV. • Partial wave analysis currently underway – stay tuned! Thank you for your attention Diffractive and Exclusive Production at CDF K. Goulianos

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