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 14.11.2009   Карта сайта     Language По-русски По-английски
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14.11.2009

Measurement of the longitudinal proton structure function at HERA



ZEUS Collaboration, S. Chekanova, M. Derricka, S. Magilla, B. Musgravea, D. Nicholass1, a, J. Reponda, R. Yoshidaa, M.C.K. Mattinglyb, P. Antoniolic, G. Baric, L. Bellagambac, D. Boscherinic, A. Brunic, G. Brunic, F. Cindoloc, M. Corradic, G. Iacobuccic, A. Margottic, R. Naniac, A. Polinic, S. Antonellid, M. Basiled, M. Bindid, L. Cifarellid, A. Contind, S. De Pasquale4, d, G. Sartorellid, A. Zichichid, D. Bartsche, I. Brocke, H. Hartmanne, E. Hilgere, H.-P. Jakobe, M. Jüngste, A.E. Nuncio-Quiroze, E. Paule, U. Samsone, V. Schönberge, R. Shehzadie, M. Wlasenkoe, N.H. Brookf, G.P. Heathf, J.D. Morrisf, M. Kaurg, P. Kaur7, g, I. Singh7, g, M. Capuah, S. Fazioh, A. Mastroberardinoh, M. Schioppah, G. Susinnoh, E. Tassih, J.Y. Kimi, Z.A. Ibrahimj, F. Mohamad Idrisj, B. Kamaluddinj, W.A.T. Wan Abdullahj, Y. Ningk, Z. Renk, F. Sciullik, J. Chwastowskil, A. Eskreysl, J. Figiell, A. Galasl, K. Olkiewiczl, B. Pawlikl, P. Stopal, L. Zawiejskil, L. Adamczykm, T. Bołdm, I. Grabowska-Bołdm, D. Kisielewskam, J. Łukasik11, m, M. Przybycieńm, L. Suszyckim, A. Kotański13, n, W. Słomiński14, n, O. Behnkeo, J. Behro, U. Behrenso, C. Blohmo, K. Borraso, D. Boto, R. Ciesielskio, N. Coppolao, S. Fango, A. Geisero, P. Göttlicher15, o, J. Grebenyuko, I. Gregoro, T. HaasCorresponding Author Contact Information, o, E-mail The Corresponding Author, W. Haino, A. Hüttmanno, F. Januscheko, B. Kahleo, I.I. Katkov16, o, U. Klein17, o, U. Kötzo, H. Kowalskio, M. Lisovyio, E. Lobodzinskao, B. Löhro, R. Mankel18, o, I.-A. Melzer-Pellmanno, S. Miglioranzi19, o, A. Montanario, T. Namsooo, D. Notzo, A. Parentio, P. Roloffo, I. Rubinskyo, U. Schneeklotho, A. Spiridonov20, o, D. Szuba21, o, J. Szuba22, o, T. Theedto, J. Tomaszewska23, o, G. Wolfo, K. Wronao, A.G. Yagües-Molinao, C. Youngmano, W. Zeuner18, o, V. Drugakovp, W. Lohmannp, S. Schlenstedtp, G. Barbagliq, E. Galloq, P.G. Pelferr, A. Bambergers, D. Doburs, F. Karstenss, N.N. Vlasov24, s, P.J. Busseyt, A.T. Doylet, M. Forrestt, D.H. Saxont, I.O. Skillicornt, I. Gialas25, u, K. Papageorgiuu, U. Holmv, R. Klannerv, E. Lohrmannv, H. Perreyv, P. Schleperv, T. Schörner-Sadeniusv, J. Sztukv, H. Stadiev, M. Turcatov, C. Foudasw, C. Fryw, K.R. Longw, A.D. Tapperw, T. Matsumotox, K. Naganox, K. Tokushuku26, x, S. Yamadax, Y. Yamazaki27, x, A.N. Barakbaevy, E.G. Boosy, N.S. Pokrovskiyy, B.O. Zhautykovy, V. Aushev29, z, O. Bachynskaz, M. Borodinz, I. Kadenkoz, O. Kuprashz, V. Libovz, D. Lontkovskyiz, I. Makarenkoz, Iu. Sorokinz, A. Verbytskyiz, O. Volynetsz, M. Zolkoz, D. Sonaa, J. de Favereauab, K. Piotrzkowskiab, F. Barreiroac, C. Glasmanac, M. Jimenezac, J. del Pesoac, E. Ronac, J. Terrónac, C. Uribe-Estradaac, F. Corriveauad, J. Schwartzad, C. Zhouad, T. Tsurugaiae, A. Antonovaf, B.A. Dolgosheinaf, D. Gladkovaf, V. Sosnovtsevaf, A. Stifutkinaf, S. Suchkovaf, R.K. Dementievag, P.F. Ermolov35, ag, L.K. Gladilinag, Yu.A. Golubkovag, L.A. Kheinag, I.A. Korzhavinaag, V.A. Kuzminag, B.B. Levchenko36, ag, O.Yu. Lukinaag, A.S. Proskuryakovag,L.M. Shcheglovaag, D.S. Zotkinag, I. Abtah, A. Caldwellah, D. Kollarah, B. Reisertah, W.B. Schmidkeah, G. Grigorescuai, A. Keramidasai, E. Koffemanai, P. Kooijmanai, A. Pellegrinoai, H. Tieckeai, M. Vázquez19, ai, L. Wiggersai, N. Brümmeraj, B. Bylsmaaj, L.S. Durkinaj, A. Leeaj, T.Y. Lingaj, P.D. Allfreyak, M.A. Bellak, A.M. Cooper-Sarkarak, R.C.E. Devenishak, J. Ferrandoak, B. Fosterak, C. Gwenlan39, ak, K. Horton40, ak, K. Oliverak, A. Robertsonak, R. Walczakak, A. Bertolinal, F. Dal Corsoal, S. Dusinial, A. Longhinal, L. Stancoal, R. Brugneraam, R. Carlinam, A. Garfagniniam, S. Limentaniam, B.Y. Ohan, A. Ravalan, J.J. Whitmore41, an, Y. Igaao, G. D'Agostiniap, G. Mariniap, A. Nigroap, J.E. Cole42, aq, J.C. Hartaq, H. Abramowicz43, ar, R. Ingbirar, S. Kananovar, A. Levyar, A. Sternar, M. Kuzeas, J. Maedaas, R. Horiat, S. Kagawa45, at, N. Okazakiat, S. Shimizuat, T. Tawaraat, R. Hamatsuau, H. Kaji46, au, S. Kitamura47, au, O. Ota48, au, Y.D. Riau, M. Costaav, M.I. Ferreroav, V. Monacoav, R. Sacchiav, V. Solaav, A. Solanoav, M. Arneodoaw, M. Ruspaaw, S. Fourletov49, ax, J.F. Martinax, T.P. Stewartax, S.K. Boutle25, ay, J.M. Butterworthay, T.W. Jonesay, J.H. Loizidesay, M. Wing50, ay, B. Brzozowskaaz, J. Ciborowski51, az, G. Grzelakaz, P. Kulinskiaz, P. Łużniak52, az, J. Malka52, az, R.J. Nowakaz, J.M. Pawlakaz, W. Perlanski52, az, A.F. Żarneckiaz, M. Adamusba, P. Plucinski53, ba, Y. Eisenbergbb, D. Hochmanbb, U. Karshonbb, E. Brownsonbc, D.D. Reederbc, A.A. Savinbc, W.H. Smithbc, H. Wolfebc, S. Bhadrabd, C.D. Catterallbd, Y. Cuibd, G. Hartnerbd, S. Menarybd, U. Noorbd, J. Standagebd and J. Whytebd






aArgonne National Laboratory, Argonne, IL 60439-4815, USA2


bAndrews University, Berrien Springs, MI 49104-0380, USA


cINFN Bologna, Bologna, Italy3


dUniversity and INFN Bologna, Bologna, Italy3


ePhysikalisches Institut der Universität Bonn, Bonn, Germany5


fH.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom6


gPanjab University, Department of Physics, Chandigarh, India


hCalabria University, Physics Department and INFN, Cosenza, Italy3


iChonnam National University, Kwangju, South Korea


jJabatan Fizik, Universiti Malaya, 50603 Kuala Lumpur, Malaysia8


kNevis Laboratories, Columbia University, Irvington on Hudson, NY 10027, USA9


lThe Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland10


mFaculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Cracow, Poland12


nDepartment of Physics, Jagellonian University, Cracow, Poland


oDeutsches Elektronen-Synchrotron DESY, Hamburg, Germany


pDeutsches Elektronen-Synchrotron DESY, Zeuthen, Germany


qINFN Florence, Florence, Italy3


rUniversity and INFN Florence, Florence, Italy3


sFakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany5


tDepartment of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom6


uDepartment of Engineering in Management and Finance, Univ. of Aegean, Greece


vHamburg University, Institute of Exp. Physics, Hamburg, Germany5


wImperial College London, High Energy Nuclear Physics Group, London, United Kingdom6


xInstitute of Particle and Nuclear Studies, KEK, Tsukuba, Japan28


yInstitute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan


zInstitute for Nuclear Research, National Academy of Sciences, and Kiev National University, Kiev, Ukraine


aaKyungpook National University, Center for High Energy Physics, Daegu, South Korea30


abInstitut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium31


acDepartamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain32


adDepartment of Physics, McGill University, Montréal, Québec, Canada H3A 2T833


aeMeiji Gakuin University, Faculty of General Education, Yokohama, Japan28


afMoscow Engineering Physics Institute, Moscow, Russia34


agMoscow State University, Institute of Nuclear Physics, Moscow, Russia37


ahMax-Planck Institut für Physik, München, Germany


aiNIKHEF and University of Amsterdam, Amsterdam, Netherlands38


ajPhysics Department, Ohio State University, Columbus, OH 43210, USA2


akDepartment of Physics, University of Oxford, Oxford, United Kingdom6


alINFN Padova, Padova, Italy3


amDipartimento di Fisica dell' Università and INFN, Padova, Italy3


anDepartment of Physics, Pennsylvania State University, University Park, PA 16802, USA9


aoPolytechnic University, Sagamihara, Japan28


apDipartimento di Fisica, Università ‘La Sapienza’ and INFN, Rome, Italy3


aqRutherford Appleton Laboratory, Chilton, Didcot, Oxon, United Kingdom6


arRaymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv, Israel44


asDepartment of Physics, Tokyo Institute of Technology, Tokyo, Japan28


atDepartment of Physics, University of Tokyo, Tokyo, Japan28


auTokyo Metropolitan University, Department of Physics, Tokyo, Japan28


avUniversità di Torino and INFN, Torino, Italy3


awUniversità del Piemonte Orientale, Novara, and INFN, Torino, Italy3


axDepartment of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A733


ayPhysics and Astronomy Department, University College London, London, United Kingdom6


azWarsaw University, Institute of Experimental Physics, Warsaw, Poland


baInstitute for Nuclear Studies, Warsaw, Poland


bbDepartment of Particle Physics, Weizmann Institute, Rehovot, Israel54


bcDepartment of Physics, University of Wisconsin, Madison, WI 53706, USA2


bdDepartment of Physics, York University, Ontario, Canada M3J 1P333






Received 15 April 2009; 


revised 16 October 2009; 


accepted 19 October 2009. 


Editor: L. Rolandi. 


Available online 21 October 2009.






Abstract


The reduced cross sections for ep deep inelastic scattering have been measured with the ZEUS detector at HERA at three different centre-of-mass energies, 318, 251 and 225 GeV. From the cross sections, measured double differentially in Bjorken x and the virtuality, Q2, the proton structure functions FL and F2 have been extracted in the region 5×10−4<x<0.007 and 20<Q2<130 GeV2.





Article Outline



1. Introduction
2. Experimental method
3. Experimental apparatus
4. Event reconstruction and selection
5. Cross section determination
6. Systematic uncertainties
7. Extraction of FL, F2 and R
8. Summary
Acknowledgements
References








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