/ Experiment-HEP hep-ex/0210068


Measurement of R = sigma(L) / sigma(T) in deep inelastic scattering on nuclei


Airapetian, A. ; Akopov, N. ; Akopov, Z. ; Amarian, M. ; Ammosov, V.V. ; Aschenauer, E.C. ; Avakian, R. ; Avetissian, A. ; Avetissian, E. ; Bailey, P. ; Baturin, V. ; Baumgarten, C. ; Beckmann, M. ; Belostotski, S. ; Bernreuther, S. ; Bianchi, N. ; Blok, H.P. ; Bottcher, H. ; Borissov, A. ; Bouhali, O. ; Bouwhuis, M. ; Brack, J. ; Brauksiepe, S. ; Brull, A. ; Brunn, I. ; Capitani, G.P. ; Chiang, H.C. ; Ciullo, G. ; Court, G.R. ; Dalpiaz, P.F. ; De Leo, R. ; De Nardo, L. ; De Sanctis, E. ; Devitsin, E. ; de Witt Huberts, P.K.A. ; Di Nezza, P. ; Duren, M. ; Ehrenfried, M. ; Elalaoui-Moulay, A. ; Elbakian, G. ; Ellinghaus, F. ; Elschenbroich, U. ; Ely, J. ; Fabbri, R. ; Fantoni, A. ; Fechtchenko, A. ; Felawka, L. ; Fischer, H. ; Fox, B. ; Franz, J. ; Frullani, S. ; Garber, Y. ; Gapienko, G. ; Gapienko, V. ; Garibaldi, F. ; Garutti, E. ; Gavrilov, G. ; Gharibyan, V. ; Graw, G. ; Grebeniouk, O. ; Green, P.W. ; Greeniaus, L.G. ; Gute, A. ; Haeberli, W. ; Hafidi, K. ; Hartig, M. ; Hasch, D. ; Heesbeen, D. ; Heinsius, F.H. ; Henoch, M. ; Hertenberger, R. ; Hesselink, W.H.A. ; Holler, Y. ; Hommez, B. ; Iarygin, G. ; Izotov, A. ; Jackson, H.E. ; Jgoun, A. ; Kaiser, R. ; Kinney, E. ; Kisselev, A. ; Kitching, P. ; Konigsmann, Kay ; Kolster, H. ; Kopytin, M. ; Korotkov, V. ; Kotik, E. ; Kozlov, V. ; Krauss, B. ; Krivokhijine, V.G. ; Lagamba, L. ; Lapikas, L. ; Laziev, A. ; Lenisa, P. ; Liebing, P. ; Lindemann, T. ; Lorenzon, W. ; Makins, N.C.R. ; Marukyan, H. ; Masoli, F. ; Menden, F. ; Mexner, V. ; Meyners, N. ; Mikloukho, O. ; Miller, C.A. ; Muccifora, V. ; Nagaitsev, A. ; Nappi, E. ; Naryshkin, Y. ; Nass, A. ; Negodaeva, K. ; Nowak, W.D. ; Oganessyan, K. ; Ohsuga, H. ; Orlandi, G. ; Podiatchev, S. ; Potashov, S. ; Potterveld, David H. ; Raithel, M. ; Reggiani, D. ; Reimer, P.E. ; Reischl, A. ; Reolon, A.R. ; Rith, K. ; Rosner, G. ; Rostomyan, A. ; Ryckbosch, D. ; Sakemi, Y. ; Sanjiev, I. ; Sato, F. ; Savin, Igor A. ; Scarlett, C. ; Schafer, A. ; Schill, C. ; Schnell, G. ; Schuler, K.P. ; Schwind, A. ; Seibert, J. ; Seitz, B. ; Shanidze, R. ; Shibata, T.A. ; Shutov, V. ; Simani, M.C. ; Sinram, K. ; Stancari, M. ; Statera, M. ; Steffens, E. ; Steijger, J.J.M. ; Stewart, J. ; Stosslein, U. ; Suetsugu, K. ; Tanaka, H. ; Taroian, S. ; Terkulov, A. ; Tessarin, S. ; Thomas, E. ; Tkabladze, A. ; Tytgat, M. ; Urciuoli, G.M. ; van der Steenhoven, G. ; van de Vyver, R. ; Vetterli, M.C. ; Vikhrov, V. ; Vincter, M.G. ; Visser, J. ; Volmer, J. ; Weiskopf, C. ; Wendland, J. ; Wilbert, J. ; Wise, T. ; Yen, S. ; Yoneyama, S. ; Zihlmann, B. ; Zohrabian, H.

Pages: 8

Abstract: Cross section ratios for deep-inelastic scattering from $^3$He, $^{14}$N and $^{84}$Kr with respect to $^2$H have been measured by the HERMES collaboration at DESY using a 27.5 GeV positron beam. The data cover a range in the Bjorken scaling variable $x$ between 0.010 and 0.65, the negative squared four-momentum transfer $Q^2$ varies from 0.5 to 15 GeV$^2$, while at small values of $x$ and $Q^2$, the virtual photon polarisation parameter $\epsilon$ extends to lower values than previous measurements. From the dependence of the data on $\epsilon$, values for $R_A/R_D$ with $R$ the ratio $\sigma_L / \sigma_T$ of longitudinal to transverse DIS cross sections have been derived and found to be consistent with unity. %The data are compared to measurements performed by NMC, E665, and SLAC %on $^4$He and $^{12}$C, and are found to be different for %$x <$ 0.06 and $Q^2 <$ 1.5 GeV$^2$.

Web-Page: http://alice.cern.ch/format/showfull?sysnb=2348297

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