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CDF :: Introduction

Muon Chambers

CDF Detector CDF Detector

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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Central Exclusive Physics Central Exclusive Physics Central state

, , P, PPP, PP

Proton/antiproton does not break up during interaction

Proton/antiproton does not break up during interaction

Both protons coherently scattered. Central state fully specified and measured, unlike “inclusive” production:

> 3 rap-gap > 3 rap-gap

Mass to ~3 GeV at ISR, ~100 GeV at Tevatron, ~700 GeV at LHC

Forward tagging of the p’s at the LHC with FP420/ 220m allows full reconstruction of the central state

~180o

pT ~ 0

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Exclusive Production Diagrams Exclusive Production Diagrams

Gamma-gamma Photoproduction QCD

p

p

g

g

gX

q-loop X

IP

IP QCD DPE

gap

gap

In perturbative QCD the lowest order prototype of the pomeron is the color neutral system of two gluons - a gluon dipole.

Central Exclusive Production

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Exclusive Exclusive Production (1) Production (1)

• Trigger (DIFF_CHIC_CMU1.5_PT1.5_TRK):– BSC Gap, east & west

– muon + track (pt > 1.3 GeV/c; || < 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 || of 7.4)

– PT() > 1.4 GeV/c & |()| < 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)

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Exclusive Exclusive Production (2) Production (2)

Example exclusive +- event: Run 199559, Event 13120174

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402 events

Fit: 2 Gaussians + QED continuum.

Masses 3.09, 3.68 GeV == PDGWidths 15.8,16.7 MeV=resolution.

QED = generator x acceptance3 amplitudes floating

J

s

Exclusive Exclusive Production (4) Production (4)p + p p + + p

(with no EM shower)

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Exclusive Exclusive Production (5) Production (5) IP sIPJ continuum

Good agreement on kinematics with STARLIGHT MC (Klein & Nystrand )IntroductionIntroduction ++-- -IP-IPJ/J/ & & (2s)(2s) IP-IPIP-IP cc J/ J/ + + Conclusion Conclusion

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•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

cc J/ J/(() + ) + (soft) (1)(soft) (1)

DPEQCD

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cc J/ J/(() + ) +

(soft)(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

cc J/ J/(() + ) + (soft) (2)(soft) (2)

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• 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

Estimating the Estimating the cc Contribution Contribution

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• An important background is undetected proton fragmentation estimated using the LPAIR MC:

– The proton frag. probability at the pp(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%

Backgrounds to Exclusive Backgrounds to Exclusive

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• 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 ee results also agreed with the Starlight (Klein & Nystrand) and LPAIR (Vermaseren) Monte Carlos

Exclusive Exclusive Production - Results Production - Results

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• 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))

Exclusive Charmonium - Results Exclusive Charmonium - Results IP J/ and IP s )

d/dy|y=0 =3.0 ± 0.3 nb

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• The -in theoretical errors - with:– T predictionof Khoze, 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

Exclusive Exclusive cc Production - Results Production - Results IP + IPc J/ (soft)

Theory90 nb

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Just Published (19th June 2009) Just Published (19th June 2009)

Principal authors: Albrow, Pinfold & Zhang

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• Our results agree with to the Durham Group’s theoretical predictions for the observation of these states

• IMPLICATIONS FOR THE LHC

– Use of /e+e- as a lumi monitor

– Study of & -p J/ as a calibration for FP420 is underway

– The process p-p/c/ b/ 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 , -p ( IP) & IP- IP collider

Final Words Final Words

p p

IP

IP

IP

LHC

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