D* meson production in diffractive DIS
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1 D* meson prodution in diffrative DIS Pierre Van Mehelen on behalf of the H1 Collaboration Low x Workshop, Bari June 17 Universiteit Antwerpen
2 D* meson prodution in diffrative DIS Diffrative deep-inelasti sattering Charaterized by large rapidity gap between proton and hadroni system X e( k Q e(k QCD desription as exhange of olletive olorless partoni states (pomerons based on - ollinear fatorization - proton vertex fatorization extration of diffrative PDFs (DPDFs, with DGLAP evolution equations s γ*(q z IP x IP... D* X(P X W D* mesons are produed via photon-gluon fusion p( P t Y(P Y probe gluon ontent of the pomeron and test fatorization ansatz Pierre Van Mehelen - Universiteit Antwerpen /99
3 NLO alulation Adapting HVQDIS for diffration Collinear fatorization with H1 6 DPDF Fit B NLO parton densities Massive harm produed via photon-gluon fusion Charm quarks fragmented independently in to D* mesons - f( D* =.35 ±.7 - Kartvelishvili parametrization for reweighting longitudinal part Fatorization and renormalization sales set to with m = 1.5 GeV The following unertainties are added in quadrature: - fatorization and renormalisation sale variation with fator.5 and - harm pole mass between 1.3 and 1.7 GeV - unertainties on Kartvelishvili parameters - DPDF unertainties Contribution of B hadrons deaying to D* (3% in nondiffrative DIS is negleted Pierre Van Mehelen - Universiteit Antwerpen 3 /99
4 The H1 detetor Rapidity Gap: LAr Calorimeter Forward Tagging System Forward Muon Detetor p - 9 GeV Sattered eletron: SpaCal D* deay produts: Central Traker 7.6 GeV - e Hadroni Final State: Central Traker LAr Calorimeter SpaCAl Luminosity Photon detetor for Bethe- Heitler bremsstrahlung Pierre Van Mehelen - Universiteit Antwerpen 4 /99
5 D* reonstrution Full reonstrution of "golden" deay hannel Branhing ratio of.66 ±.3% K π + invariant mass within 8 MeV of nominal D mass Simultaneous fit to Δm for right and wrong harge ombination to extrat signal and bakground D* in diffrative DIS Entries 4 35 signal fit bgd fit N(D* = 1169 ± 58 Entries 4 35 wrong harge bgd fit m(k π ± π s ± - m(k π ± [GeV] ± ± ± m(k ± s - m(k π ± [GeV] total number of D* mesons = /- 58 π ± π ± Pierre Van Mehelen - Universiteit Antwerpen 5 /99
6 Data orreted for - bakground - trigger effiieny - aeptane - QED radiation Systemati unertainty dominated by p-diss Data analysis Data olleted in 5-6 at s = 319 GeV Integrated luminosity = 87 pb 1 N(D* 4 IP exhange IP p-diss IR exhange Detetor level omparison of data vs. RAPGAP (reweighted Q [GeV ] N(D* y N(D* log (x IP N(D* 5 4 N(D* 5 4 N(D* obs z IP [GeV] p η D* Pierre Van Mehelen - Universiteit Antwerpen 6 /99
7 Integrated ross setion Result from data NLO HVQDIS alulation based on H1 6 DPDF Fit B Pierre Van Mehelen - Universiteit Antwerpen 7 /99
8 Differential ross setions ] [nb / GeV 1-1 D* in diffrative DIS NLO QCD, H1 6 Fit B dσ/dy [nb] 1.5 D* in diffrative DIS NLO QCD, H1 6 Fit B dσ/dq data / NLO data / NLO e( k Q e(k.5 s γ*(q z IP... D* X(P X W Q [GeV ]..4.6 y x IP p( P t Y(P Y Pierre Van Mehelen - Universiteit Antwerpen 8 /99
9 Differential ross setions [nb] (x dσ/dlog IP.6.4 D* in diffrative DIS NLO QCD, H1 6 Fit B [nb] obs dσ/dz IP 1. D* in diffrative DIS NLO QCD, H1 6 Fit B.5. data / NLO 4 3 data / NLO 1 1 e( k Q e(k s γ*(q z IP... D* X(P X W log (x IP obs z IP x IP p( P t Y(P Y Pierre Van Mehelen - Universiteit Antwerpen 9 /99
10 Differential ross setions [nb / GeV] 1 D* in diffrative DIS NLO QCD, H1 6 Fit B [nb] dσ/dη D*. D* in diffrative DIS NLO QCD, H1 6 Fit B dσ/dp data / NLO data / NLO.5 1 e( k Q e(k s γ*(q z IP... D* X(P X W p [GeV] -1 1 η D* x IP p( P t Y(P Y Pierre Van Mehelen - Universiteit Antwerpen /99
11 Diffrative-to-nondiffrative ratio Result from data NLO HVQDIS alulation based on H1 6 DPDF Fit B Pierre Van Mehelen - Universiteit Antwerpen 11 /99
12 Diffrative-to-nondiffrative ratio R D. D* diffrative fration in DIS NLO QCD R D. D* diffrative fration in DIS NLO QCD y Q [GeV ] R D D* diffrative fration in DIS NLO QCD R D.15 D* diffrative fration in DIS NLO QCD p [GeV] -1 1 η D* Pierre Van Mehelen - Universiteit Antwerpen 1/99
13 Comparison to previous measurements Diffrative fration D* prodution at HERA H1 17 H1 1 ZEUS ZEUS 3 5 < Q < GeV p > 1.5 GeV, x < Q < GeV p > GeV, x <.4 4 < Q < 4 GeV p > 1.5 GeV, x 1.5 < Q < GeV p > 1.5 GeV, x <.35 IP, IP,, IP IP <.3 <.16, ZEUS 3 Q p, < 1 GeV > 1.9 GeV, x IP < R D [%] Agreement with previous results Compatible ratios in DIS and photoprodution Pierre Van Mehelen - Universiteit Antwerpen 13/99
14 Summary New results with 6-fold inrease in integrated luminosity - Smaller unertainty, more differential Well desribed by NLO alulations - Support for ollinear fatorization in diffration Diffrative-to-nondiffrative ratios also in agreement with NLO alulations - No sign for different rapidity gap probability in DIS and photoprodution Pierre Van Mehelen - Universiteit Antwerpen 14/99
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