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Measurement of the proton structure function FL(x,Q2) at low x

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 1 W. Bartel M. Beckingham K. Begzsuren O. Behnke A. Belousov N. Berger J.C. Bizot 2 M.-O. Boenig V. Boudry I. Bozovic-Jelisavcic J. Bracinik G. Brandt M. Brinkmann V. Brisson 2 D. Bruncko A. Bunyatyan G. Buschhorn L. Bystritskaya A.J. Campbell K.B. Cantun Avila F. Cassol-Brunner 3 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 2 M. del Degan J. Delvax A. de Roeck E.A. de Wolf C. Diaconu 3 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 3 R. Horisberger A. Hovhannisyan T. Hreus M. Jacquet 2 M.E. Janssen X. Janssen V. Jemanov L. Jönsson D.P. Johnson A.W. Jung H. Jung M. Kapichine J. Katzy I.R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Klimkovich T. Kluge A. Knutsson R. Kogler V. Korbel P. Kostka M. Kraemer K. Krastev J. Kretzschmar A. Kropivnitskaya K. Krüger K. Kutak M.P.J. Landon W. Lange G. La?tovi?ka-Medin P. Laycock A. Lebedev G. Leibenguth V. Lendermann S. Levonian G. Li 2 K. Lipka A. Liptaj B. List J. List N. Loktionova R. Lopez-Fernandez V. Lubimov A.-I. Lucaci-Timoce L. Lytkin A. Makankine E. Malinovski P. Marage Ll. Marti H.-U. Martyn S.J. Maxfield A. Mehta K. Meier A.B. Meyer H. Meyer J. Meyer V. Michels S. Mikocki I. Milcewicz-Mika F. Moreau A. Morozov J.V. Morris M.U. Mozer M. Mudrinic K. Müller P. Murín K. Nankov B. Naroska Th. Naumann P.R. Newman C. Niebuhr A. Nikiforov G. Nowak K. Nowak M. Nozicka B. Olivier J.E. Olsson S. Osman D. Ozerov V. Palichik I. Panagoulias M. Pandurovic Th. Papadopoulou C. Pascaud 2 G.D. Patel O. Pejchal H. Peng E. Perez A. Petrukhin I. Picuric S. Piec D. Pitzl R. Pla?akyt? R. Polifka B. Povh T. Preda V. Radescu A.J. Rahmat N. Raicevic A. Raspiareza T. Ravdandorj P. Reimer E. Rizvi P. Robmann B. Roland R. Roosen A. Rostovtsev M. Rotaru J.E. Ruiz Tabasco Z. Rurikova S. Rusakov D. Salek F. Salvaire D.P.C. Sankey M. Sauter E. Sauvan 3 S. Schmidt S. Schmitt C. Schmitz L. Schoeffel A. Schöning H.-C. Schultz-Coulon F. Sefkow R.N. Shaw-West I. Sheviakov L.N. Shtarkov S. Shushkevich T. Sloan I. Smiljanic P. Smirnov Y. Soloviev P. Sopicki D. South V. Spaskov A. Specka Z. Staykova M. Steder B. Stella U. Straumann D. Sunar T. Sykora V. Tchoulakov G. Thompson P.D. Thompson T. Toll F. Tomasz T.H. Tran 2 D. Traynor T.N. Trinh 3 P. Truöl I. Tsakov B. Tseepeldorj I. Tsurin J. Turnau E. Tzamariudaki K. Urban A. Valkárová Corentin Vallée 3 P. van Mechelen A. Vargas Trevino Y. Vazdik S. Vinokurova V. Volchinski D. Wegener M. Wessels Ch. Wissing E. Wünsch V. Yeganov J. Žáček J. Zálešák Zhiqing Zhang 2 A. Zhelezov A. Zhokin Y.C. Zhu T. Zimmermann H. Zohrabyan F. Zomer 2
Abstract : A first measurement is reported of the longitudinal proton structure function F_L(x,Q^2) at the ep collider HERA. It is based on inclusive deep inelastic e^+p scattering cross section measurements with a positron beam energy of 27.5 GeV and proton beam energies of 920, 575 and 460 GeV. Employing the energy dependence of the cross section, F_L is measured in a range of squared four-momentum transfers 12 < Q^2 < 90 GeV^2 and low Bjorken x 0.00024 < x < 0.0036. The F_L values agree with higher order QCD calculations based on parton densities obtained using cross section data previously measured at HERA.
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Submitted on : Tuesday, June 24, 2008 - 11:37:39 AM
Last modification on : Wednesday, September 16, 2020 - 4:22:11 PM

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F.D. Aaron, C. Alexa, V. Andreev, B. Antunovic, S. Aplin, et al.. Measurement of the proton structure function FL(x,Q2) at low x. Physics Letters B, Elsevier, 2008, 665, pp.139-146. ⟨10.1016/j.physletb.2008.05.070⟩. ⟨in2p3-00289949⟩

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