Selected Results on Diffraction at HERA
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1 Selected Results on Diffraction at HERA Grzegorz Gach Various Faces of QCD May 014 Grzegorz Gach Selected Results on Diffraction at HERA 1
2 HERA DESY, Hamburg e/e + - p 7.5 GeV 80 GeV 90 GeV Ldt = 0.5 fb 1 per experiment Grzegorz Gach Selected Results on Diffraction at HERA
3 NC Lepton-Proton Interaction e(k) e (k ) γ (q) X p(p) Q = (k k ) virtuality of exchanged boson - Q 0 PHP - Q > 1 GeV DIS y = P q P k inelasticity W = (P + q) photon-proton CME s = (P + k) lepton-proton CME Grzegorz Gach Selected Results on Diffraction at HERA 3
4 Diffraction e e γ IP p quantum numbers of: γ and X are equal p and p are equal X rapidity gap p x IP fraction of proton momentum carried by Pomeron β = x/x IP variable equivalent to the Bjorken x, but relative to the pomeron momentum Grzegorz Gach Selected Results on Diffraction at HERA 4
5 Outline e e γ IP X rapidity gap p p Inclusive Diffraction in DIS e(k) e (k ) γ (q) IP(x IPP) jet jet p(p) p (P ) Exclusive Diffractive Dijet Production in DIS Diffractive Vector Meson Production in PHP Grzegorz Gach Selected Results on Diffraction at HERA 5
6 Inclusive Diffraction e e γ IP X rapidity gap p t p Grzegorz Gach Selected Results on Diffraction at HERA 6
7 Diffractive Selection Proton Spectrometer clean measurement - no double dissociative background low statistics η=1.1 electron η= 0.75 scattered electron proton Large Rapidity Gap high statistics contains double dissociative background FCAL BCAL RCAL Grzegorz Gach Selected Results on Diffraction at HERA 7
8 γ QCD Approach p p colour singlet gluon system is exchanged d 4 σ ep e Xp dβdq dx IP dt = πα βq 4 y + Factorisation q q QCD Factorisation σ D (γ p Xp) f D i (x, Q, x IP, t) σ γ i(x, Q ) universal diffractive parton densities Proton Vertex Factorisation fi D (x, Q, x IP, t) f IP/p (x IP, t) fi/ip D (x/x IP, Q ) = pomeron flux = pomeron parton densities [ F D(4) (β, Q, x IP, t) y y + F D(4) L (β, Q, x IP, t) ] = σr D(4) (β,q,x IP,t) Grzegorz Gach Selected Results on Diffraction at HERA 8
9 HERA Combined Cross Sections Eur. Phys. J. C7 (01) Q 00 GeV, β 0.816, x IP 0.09, ZEUS 0.09 < t < 0.55 GeV EPJ C38, 43 (004) Nucl. Phys. B816, 1 (009) x IP σ r D(3) H1 FPS HERA II ZEUS LPS x IP =0.05 H1 and ZEUS H1 FPS HERA I HERA ZEUS LPS < t <0.55 GeV β=0.018 (x 6) β=0.056 (x 3) H1 EPJ C48, 749 (006) EPJ C71, 1578 (011) β=0.18 Q (GeV ) Grzegorz Gach Selected Results on Diffraction at HERA 9
10 l Inclusive Diffractive DIS at HERA EPJ C7 (01) 074 σ D(3) r. x IP 3 x IP =0.003 H1 LRG (M Y ZEUS LRG (M Y < 1.6 GeV) β =0.017 (l=8) < 1.6 GeV) β =0.07 (l=7) H1 006 DPDF Fit B (extrapol. fit) Dipole Model γ Color Dipole Model q β =0.043 (l=6) β =0.067 (l=5) q IP β =0.11 (l=4) 1 β =0.17 (l=3) p p 1 H1 β =0.7 (l=) β =0.43 (l=1) Q β =0.67 (l=0) [GeV ] DPDF calculations describe data at Q > GeV the dipole model is better at low Q Grzegorz Gach Selected Results on Diffraction at HERA
11 Inclusive Diffractive DIS at HERA F D(3) (Q, β, x IP ) = f IP/p (x IP ) tmin t cut EPJ C7 (01) 074 = e B IP t x α IP (t) 1 IP dt F IP (Q, β)+n IR f IR/p (x IP )F IR (Q, β) α IP (0) H1 LRG (M Y <1.6 GeV) (exp.+model) H1 LRG 1997 (M Y <1.6 GeV) (exp.+model) H1 FPS HERA-II (exp.+model) 1.16 ZEUS LRG+LPS (exp.+model) no Q dependence supports the proton vertex factorisation hypothesis H1 α IP (0) = ± 0.00 (exp.) (model) Q [GeV ] Grzegorz Gach Selected Results on Diffraction at HERA 11
12 Exclusive Diffractive Dijets in DIS e(k) e (k ) γ (q) IP(x IP P) jet jet p(p) p (P ) Grzegorz Gach Selected Results on Diffraction at HERA 1
13 Exclusive Diffractive Dijets in DIS ZEUS-prel BGF -gluon exchange γ γ q q p p requires diffractive parton density functions pure QCD calculations Grzegorz Gach Selected Results on Diffraction at HERA 13
14 Exclusive Diffractive Dijets in DIS ZEUS-prel x e lepton plane φ γ jet e jet θ θ IP z y jet plane Grzegorz Gach Selected Results on Diffraction at HERA 14
15 Exclusive Diffractive Dijets in DIS ZEUS-prel BGF -gluon exchange dσ/dφ 1 + A cos(φ) dσ/dφ described by the same function in both mechanisms two-gluon exchange mechanism predicts negative A boson-gluon fusion mechanism predicts positive A Grzegorz Gach Selected Results on Diffraction at HERA 15
16 Exclusive Diffractive Dijets in DIS ZEUS-prel ZEUS ) 1 1/σ dσ/dφ (rad ZEUS (prel.) 37 pb gluon qq (normalised) BGF (normalised) fit (1 + A cos(φ)) A φ (rad) χ /NDF 0.18 ± 0.06(stat.) (sys.) 4.11/3 dσ 1 + A cos(φ) negative A factor Grzegorz Gach Selected Results on Diffraction at HERA 16
17 Diffractive Vector Meson Production Grzegorz Gach Selected Results on Diffraction at HERA 17
18 Diffractive Vector Meson Production Events / (0.0 GeV) H1 J/ψ µ + µ photoproduction H1 data s = 318 GeV Fit (signal +bkg) m µµ [GeV] Eur. Phys. J. C73 (013) 466 Events ZEUS 1 ZEUS 96/07 (468 pb ) + BH γγ µ µ + ϒ(1S,S,3S) µ µ BH + ϒ(1S,S,3S) (GeV) M µ + µ Phys. Lett. B 708 (01) 14 Grzegorz Gach Selected Results on Diffraction at HERA 18
19 ] p J/ψ p) [nb/gev (γ dσ dt 1 H1 elastic J/ψ photoproduction Q = 0.1 GeV 40 GeV < W γp < 1 GeV dσ el J/ψ Photoproduction Eur. Phys. J. C73 (013) 466 H1 data HE Fit HE, H1(03) -t [GeV ] = N el exp( b el t ) dt b el = (4.88 ± 0.15)GeV ] p J/ψ Y) [nb/gev (γ dσ dt 1 dσ pd H1 p-diss. J/ψ photoproduction Q = 0.1 GeV 40 GeV < W γp < 1 GeV M Y < GeV H1 data HE Fit HE, H1(03) t [GeV ] = N pd (1 + b pd t /n) n dt b pd = (1.79 ± 0.1)GeV Grzegorz Gach Selected Results on Diffraction at HERA 19
20 J/ψ Photoproduction Eur. Phys. J. C73 (013) 466 p J/ψ p) [nb] σ(γ 3 H1 data HE H1 data LE H1(005) Zeus(00) E401, E516 LHCb(013) MNRT(LO) MNRT(NLO) Elastic J/ψ photoproduction LO fits describe all (includining LHCb) data well NLO fits overestimate LHCb data [GeV] W γp 3 Grzegorz Gach Selected Results on Diffraction at HERA 0
21 Upsilon (1S) Exclusive Photoproduction Phys. Lett. B 708 (01) 14 ) dn/d t (GeV ZEUS 1 ZEUS 96/07 (468 pb ) BH + ϒ(1S) (exclusive + pdiss) + BH γγ µ µ + ϒ(1S) µ µ (exclusive) + ϒ(1S) µ µ (pdiss) b (GeV - ) ρ ZEUS (10 pb -1 ) ρ ZEUS 94 ρ ZEUS 95 ρ H DVCS ZEUS LPS (31 pb -1 ) DVCS H DVCS H1 φ ZEUS 94 φ ZEUS φ H J/ψ ZEUS J/ψ ZEUS J/ψ H ϒ ZEUS (468 pb -1 ) t (GeV ) b = (stat.) (syst.)GeV first determination of Υ(1S) t slope Q +M VM (GeV ) t slope measurement extended to Q + M V M 90 GeV Grzegorz Gach Selected Results on Diffraction at HERA 1
22 Summary Inclusive Diffraction in DIS H1 and ZEUS result combination provide unprecedented precision measurements support proton vertex factorisation Exclusive Diffractive Dijet Production in DIS the first measurement of the jet azimuthal angular distribution in e ± p interactions data favour -gluon exchange model Vector Meson Production elastic and proton dissociative t slopes measured in J/Ψ production the first measurement of Υ (1S) t slope Grzegorz Gach Selected Results on Diffraction at HERA
23 Thank You for Your Attention! Grzegorz Gach Selected Results on Diffraction at HERA 3
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