li-measurementofdiffrac-2009.pdf (549.77 kB)
Measurement of diffractive scattering of photons with large momentum transfer at HERA
journal contribution
posted on 2009-02-23, 00:00 authored by F D Aaron, C Alexa, V Andreev, B Antunovic, S Aplin, A Asmone, A Astvatsatourov, A Bacchetta, S Backovic, A Baghdasaryan, P Baranov, E Barrelet, W Bartel, M Beckingham, K Begzsuren, O Behnke, A Belousov, N Berger, J C Bizot, M O Boenig, V Boudry, I Bozovic-Jelisavcic, J Bracinik, G Brandt, M Brinkmann, V Brisson, D Bruncko, A Bunyatyan, G Buschhorn, L Bystritskaya, A J Campbell, K B Cantun Avila, F Cassol-Brunner, K Cerny, V Cerny, V Chekelian, A Cholewa, J G Contreras, J A Coughlan, G Cozzika, J Cvach, J B Dainton, K Daum, M Deák, Y de Boer, B Delcourt, M Del Degan, J Delvax, A De Roeck, E A De Wolf, C Diaconu, V Dodonov, A Dossanov, A Dubak, G Eckerlin, V Efremenko, S Egli, A Eliseev, E Elsen, S Essenov, A Falkiewicz, P J W Faulkner, L Favart, A Fedotov, R Felst, J Feltesse, J Ferencei, L Finke, M Fleischer, A Fomenko, E Gabathuler, J Gayler, S Ghazaryan, A Glazov, I Glushkov, L Goerlich, M Goettlich, N Gogitidze, M Gouzevitch, C Grab, T Greenshaw, B R Grell, G Grindhammer, S Habib, D Haidt, M Hansson, C Helebrant, R C W Henderson, H Henschel, G Herrera, M Hildebrandt, K H Hiller, D Hoffmann, R Horisberger, A Hovhannisyan, T Hreus, M Jacquet, M E Janssen, X Janssen, V JemanovThe first measurement of diffractive scattering of quasi-real photons with large momentum transfer γ p → γ Y, where Y is the proton dissociative system, is made using the H1 detector at HERA. The measurement is performed for initial photon virtualities Q 2 < 0.01 GeV 2. Single differential cross sections are measured as a function of W, the incident photon-proton centre of mass energy, and t, the square of the four-momentum transferred at the proton vertex, in the range 175 < W < 247 GeV and 4 < | t | < 36 GeV 2. The W dependence is well described by a model based on perturbative QCD using a leading logarithmic approximation of the BFKL evolution. The measured | t | dependence is harder than that predicted by the model and those observed in exclusive vector meson production. © 2009.
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Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy PhysicsVolume
672Issue
3Pagination
219 - 226Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
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ISSN
0370-2693Language
engPublication classification
C1.1 Refereed article in a scholarly journalUsage metrics
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