Measurement of the proton structure function FL(x,Q2) at low x
F. D. AaronNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaC. AlexaNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaVladimir AndreevLebedev Physical Institute , Moscow , RussiaB. AntunovićS. AplinA. AsmoneDipartimento di Fisica Università di Roma Tre and INFN Roma 3, Roma, ItalyA. AstvatsatourovInter-University Institute for High Energies ULB-VUB , Brussels ,Alessandro BacchettaS. BackovićFaculty of Science , University of Montenegro , Podgorica , MontenegroA. BaghdasaryanYerevan Physics Institute, Yerevan, ArmeniaP. BaranovLebedev Physical Institute , Moscow , RussiaE. BarreletSorbonne UniversitéW. BartelM. BeckinghamK. BegzsurenMongolian Academy of Sciences, Ulaanbaatar, MongoliaO. BehnkePhysikalisches Institut , Universität Heidelberg , Heidelberg , GermanyA. BelousovLebedev Physical Institute , Moscow , RussiaN. BergerInstitut für Teilchenphysik , ETH , Zürich , SwitzerlandJ.C. BizotUniversité Paris Cité, Paris, FranceM.-O. BoenigInstitut für Physik , TU Dortmund , Dortmund , GermanyV. BoudryÉcole Polytechnique, Palaiseau, FranceI. Božović-Jelisavc̆ićInstitute of Economic SciencesJ. BraciníkSorbonne UniversitéG. BrandtDESY , Hamburg , GermanyMartin BrinkmannDESY , Hamburg , GermanyV. BrissonUniversité Paris CitéD. BrunckoSlovak Academy of Sciences, Bratislava, SlovakiaA. BunyatyanMax Planck Institute for Nuclear PhysicsG. BuschhornMax Planck Society, Munich, GermanyL. BystritskayaInstitute for Theoretical and Experimental Physics , Moscow , RussiaAlan CampbellDESY , Hamburg , GermanyK. B. Cantun AvilaCenter for Research and Advanced Studies of the National Polytechnic Institute, Mexico City, MexicoF. Cassol-BrunnerCentre National de la Recherche Scientifique, Paris, FranceK. ČernýCharles University, Prague, CzechiaV. ČernýInstitute of Experimental Physics , Slovak Academy of Sciences , Košice , Slovak RepublicV. ChekelianMax Planck Institute of PsychiatryA. CholewaJ.G. ContrerasagJ. A. CoughlanRutherford Appleton Laboratory , Chilton , Didcot , UKG. CozzikaCEA Paris-SaclayJ. CvachLPNHE , Universités Paris VI and VII , IN2P3-CNRS , Paris , FranceJ.B. DaintonDepartment of Physics , University of Liverpool , Liverpool , UKK. DaumAlso at Rechenzentrum , Universität Wuppertal , Wuppertal , GermanyMichal DeákY. de BoerDESY , Hamburg , GermanyB. DelcourtLAL , Université de Paris-Sud , CNRS/IN2P3 , Orsay , FranceM. Del DeganSwiss National Science Foundation, Bern, SwitzerlandJ. DelvaxUniversity of Antwerp, Antwerp, BelgiumA. De RoeckDESY , Hamburg , GermanyE. A. De WolfUniversity of Antwerp, Antwerp, BelgiumC. DiaconuLPNHE , Universités Paris VI and VII , IN2P3-CNRS , Paris , FranceV. DodonovMax Planck Society, Munich, GermanyA. DossanovMax-Planck-Institut für Physik , München , GermanyA. DubakMax Planck Society, Munich, GermanyG. EckerlinV. EfremenkoInstitute for Theoretical and Experimental Physics , Moscow , RussiaS. EgliPaul Scherrer Institut , Villigen , SwitzerlandA. EliseevLebedev Physical Institute , Moscow , RussiaE. ElsenS. EssenovInstitute for Theoretical and Experimental Physics , Moscow , RussiaA. FalkiewiczInstitute for Nuclear Physics , Cracow , PolandPeter FaulknerSchool of Physics and Astronomy , University of Birmingham , Birmingham , UKL. FavartInter-University Institute for High Energies ULB-VUB , Brussels ,A. FedotovInstitute for Theoretical and Experimental Physics , Moscow , RussiaR. FelstJ. FeltesseDSM (Netherlands), Heerlen, NetherlandsJ. FerenceiSlovak Academy of Sciences, Bratislava, SlovakiaL. FinkeM. FleischerA. FomenkoLebedev Physical Institute , Moscow , RussiaE. GabathulerDepartment of Physics , University of Liverpool , Liverpool , UKJ. GaylerInstitut National de Physique Nucléaire et de Physique des ParticulesS. GhazaryanInstitut für Teilchenphysik , ETH , Zürich , SwitzerlandA. GlazovI. GlushkovUniversiteit Antwerpen , Antwerpen , BelgiumL. GoerlichInstitute for Nuclear Physics , Cracow , PolandM. GoettlichInstitut für Experimentalphysik , Universität Hamburg , Hamburg , GermanyN. GogitidzeLebedev Physical Institute , Moscow , RussiaM. GouzevitchÉcole Polytechnique, Palaiseau, FranceC. GrabSwiss National Science Foundation, Bern, SwitzerlandT. GreenshawDepartment of Physics , University of Liverpool , Liverpool , UKB.R. GrellG. GrindhammerMax Planck Institute of PsychiatryS. HabibInstitut für Experimentalphysik , Universität Hamburg , Hamburg , GermanyD. HaidtDESY , Hamburg , GermanyM. HanssonInstitut für Teilchenphysik , ETH , Zürich , SwitzerlandC. HelebrantETH ZurichR. C. W. HendersonDepartment of Physics , University of Lancaster , Lancaster , UKH. HenschelUniversiteit Antwerpen , Antwerpen , BelgiumG. HerreraCenter for Research and Advanced Studies of the National Polytechnic Institute, Mexico City, MexicoM. HildebrandtK. H. HillerUniversiteit Antwerpen , Antwerpen , BelgiumD. HoffmannCentre National de la Recherche Scientifique, Paris, FranceR. HorisbergerPaul Scherrer Institut , Villigen , SwitzerlandA. HovhannisyanAlikhanyan National Laboratory, Yerevan, ArmeniaT. HreusUniversity of Antwerp, Antwerp, BelgiumM. JacquetUniversité Paris Cité, Paris, FranceM.E. JanssenDESY , Hamburg , GermanyX. JanssenInstitut für Teilchenphysik , ETH , Zürich , SwitzerlandV. JemanovUniversität Hamburg, Hamburg, Germany
2008lv
ABI
Abstract
A first measurement is reported of the longitudinal proton structure function FL(x,Q2) at the ep collider HERA. It is based on inclusive deep inelastic e+p scattering cross section measurements with a positron beam energy of 27.5GeV and proton beam energies of 920, 575 and 460GeV. Employing the energy dependence of the cross section, FL is measured in a range of squared four-momentum transfers 12⩽Q2⩽90GeV2 and low Bjorken x0.00024⩽x⩽0.0036. The FL values agree with higher order QCD calculations based on parton densities obtained using cross section data previously measured at HERA.
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