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CDF :: Introduction

CDF Detector. CDF :: Introduction. Muon Chambers. A Roman Pot deployed detector is placed on one side of CDF at at 60m from the IP. (RPS acceptance ~80% for 0.03 < x < 0.1 and |t| < 0.1).

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CDF :: Introduction

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  1. James L Pinfold EDS 2009

  2. CDF Detector CDF :: Introduction Muon Chambers A Roman Pot deployed detector is placed on one side of CDF at at 60m from the IP. (RPS acceptance ~80% for 0.03 < x < 0.1 and |t| < 0.1) Introduction  +--IPJ/ & (2s) IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  3. Central Exclusive Physics Central state Proton/antiproton does not break up during interaction pT ~ 0 > 3 rap-gap , P, PP gg > 3 rap-gap  ~180o Proton/antiproton does not break up during interaction Both protons coherently scattered. Central state fully specified and measured, unlike “inclusive” production: Forward tagging of the p’s at the LHC with FP420/ 220m allows full reconstruction of the central state Mass to ~3 GeV at ISR, ~100 GeV at Tevatron, ~700 GeV at LHC Introduction  +--IPJ/ & (2s) IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  4. p g g X g p Exclusive Production Diagrams Gamma-gamma Photoproduction QCD Central Exclusive Production gap IP  DPE X QCD gap IP q-loop In perturbative QCD the lowest order prototype of the pomeron is the color neutral system of two gluons - a gluon dipole. Introduction  +--IPJ/ & (2s) IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  5. Exclusive  Production (1) • Trigger (DIFF_CHIC_CMU1.5_PT1.5_TRK): • BSC Gap, east & west • muon + track (pt > 1.3 GeV/c; |h| < 1.2) • 3.0 < M(muon + track) < 4.0 GeVc2 • The existing sample corresponds to a lumi of 1.48 fb-1 • Offline cuts • No other activity in the events (to an |h| of 7.4) • PT(m) > 1.4 GeV/c & |h(m)| < 0.6 • Cosmic ray cuts (abs (TOF) < 3 ns) • Exclusivity cuts (same as for the e+e- paper) • STARLIGHT Monte Carlo simulation used (Klein & Nystrand) Introduction +--IPJ/ & (2s) IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  6. Exclusive  Production (2) Example exclusive m+m- event: Run 199559, Event 13120174 Introduction +--IPJ/ & (2s) IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  7. Exclusive  Production (4) p + p  p +  + p J Fit: 2 Gaussians + QED continuum. Masses 3.09, 3.68 GeV == PDG Widths 15.8,16.7 MeV=resolution. QED = generator x acceptance 3 amplitudes floating 402 events (with no EM shower) s Introduction +--IPJ/ & (2s) IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  8. Exclusive  Production (5) IPsm+m- IPJ+m- ggm+m- continuum Good agreement on kinematics with STARLIGHT MC (Klein & Nystrand ) Introduction +--IPJ/ & (2s)IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  9. c J/() + (soft) (1) DPE QCD  • Similar selection as  search with additional isolated EM shower req. • New ChicMC -Durham • Khoze,Martin,Ryskin,Stirling, EPJ C35, 211 (2004), implemented by J. Stirling Introduction +--IPJ/ & (2s)IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  10. c J/() + (soft) (2) c J/() + (soft) The ChiC-MC-Durham is a good fit the data Good fit to  kinematics from c, if there is an EM shower in the event Introduction +--IPJ/ & (2s)IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  11. Estimating the c Contribution • Plot show fit of ET spectrum for events from J/ peak with: • EEMT tower > 100 MeV • Total number of c events: 68.2 ± 8.3 • 65.4 c events above the 80 MeV exclusivity cut • 4.0± 1.6% c event background to exclusive J/ signal • Additional  inefficiency from: Conversions - 7%, Dead regions - 5.0% • CHECK - Muon-pair events with an accompanying photon with ET > 80 MeV were from the J/ peak as expected if they are c decays Introduction  +--IPJ/ & (2s)IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  12. Backgrounds to Exclusive  • An important background is undetected proton fragmentation estimated using the LPAIR MC: • The proton frag. probability at the pp(p*) vertex is estimated as 17% • The proton frag. probability at the pIPp (p*) vertex is estimated as 24% • From the ratio of single diffractive frag. to elastic scattering at the Tevatron • The probability that all proton fragmentation products have || >7.4 is 14% • The probability that decay products may not be detected due to BSC inefficiency is 8% Introduction  +--IPJ/ & (2s) IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  13. Exclusive  Production - Results g • This QED cross-section is in principle very well understood • The  results agree with the Starlight (Klein & Nystrand) and LPAIR (Vermaseren) Monte Carlos • Predicted a cross-section of 2.18 ± 0.01 pb • Reminder - the ee results also agreed with the Starlight (Klein & Nystrand) and LPAIR (Vermaseren) Monte Carlos Introduction +--IPJ/ & (2s) IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  14. Exclusive Charmonium - Results IPJ/and IPs) • The J/ results (ds/dy|y=0) agrees with theoretical predictions: • V.A. Khoze , A.D. Martin , M.G. RyskinEur.Phys.J.C24:459-468,2002. • S.Klein and J.Nystrand, Starlight, Phys. Rev. Lett. 92:142003 (2004). • L.Motyka and G.Watt, Phys. Rev. D78:014023 (2008). • W.Schafer and A.Szczurek, Phys. Rev. D 76, 094014(2007). • V.P.Goncalves and M.V.T.Machado, Eur. Phys. J. C 40, 519 (2005). • The (2s) result consistent with the Starlight prediction • R = (2s)/(1s) = 0.14 ± 0.05 is in agreement with the HERA value of R = 0.166 ± 0.012 at similar s(p) (H.Jung, Acta. Phys. Polon. Supp.1, 531 (2008)) d/dy|y=0 = 3.0 ± 0.3 nb Introduction +--IPJ/ & (2s) IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  15. Exclusive c Production - Results IP + IPcJ/(soft) Theory 90 nb • The  -in theoretical errors - with: • T predictionofKhoze, Martin & Ryskin EPJ C19, 447 (2001), Erratum C20 599 (2001) & Khoze , Martin, Ryskin & Stirling, Eur.Phys.J.C35:211-220,2004 • The calculation of Pasechnik, Szczurek & Teryaev,arXiv:0902.1689[hep-ph]. • In this analysis it is assumed that the produced c is 0++ (JPC) • NB double-diffractive production of exclusive axial vector (1++) & tensor (2++) quarkonium states are strongly suppressed (Khoze, Martin & Ryskin, EPJ C19, 447 (2001) • Caveat: the large BR of the c (1++) to J/ means it may contribute to our signal Introduction  +--IPJ/ & (2s)IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  16. Just Published (19th June 2009) Principal authors: Albrow, Pinfold & Zhang Introduction +--IPJ/ & (2s) IP-IPc J/ +  Conclusion James L Pinfold EDS 2009

  17. Final Words • Our results agree with to the Durham Group’s theoretical predictions for the observation of these states • IMPLICATIONS FOR THE LHC • Use ofggm+m- /e+e- as a lumi monitor • Study ofggm+m- & -p  J/ m+m- as a calibration for FP420 is underway • The process p-pgg/cc/ cb/ j-j are standard candles for the exclusive Higgs • Thus, according to Durham Group predictions principle, we should see the CEP Higgs boson at the LHC • A proving ground for Central Exclusive Physics that will be exploited by the RP220 /FP420 forward proton spectrometers at the LHC • We are understanding that the LHC is a gg, g-p (g-IP) & IP- IP collider IP IP g LHC p p g g IP Introduction +--IPJ/ & (2s) IP-IPc J/ + Conclusion James L Pinfold EDS 2009

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