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  1. Book: Transversity distribution and polarized fragmentation function from semi-inclusive pion electroproduction

    Korotkov, V. A / Nowak, Wolf-Dieter / Oganessyan, K. A

    (DESY ; 99-176)

    1999  

    Author's details V. A. Korotkov; W.-D. Nowak; K. A. Oganessyan
    Series title DESY ; 99-176
    Language English
    Size 10 Sp, graph. Darst, 30 cm
    Publisher DESY, Zentralbibliothek ; DESY, Bibliothek
    Publishing place Hamburg ; Zeuthen
    Document type Book
    Note Unterschiede zwischen dem gedruckten Dokument und der elektronischen Dokumentversion können nicht ausgeschlossen werden
    Database Former special subject collection: coastal and deep sea fishing

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  2. Book: Transversity distribution and polarized fragmentation function from semi-inclusive pion electroproduction

    Korotkov, V. A / Nowak, Wolf-Dieter / Oganessyan, K. A

    (DESY ; 99-176)

    1999  

    Author's details V. A. Korotkov; W.-D. Nowak; K. A. Oganessyan
    Series title DESY ; 99-176
    Language English
    Size 10 Sp, graph. Darst, 30 cm
    Publisher DESY, Zentralbibliothek ; DESY, Bibliothek
    Publishing place Hamburg ; Zeuthen
    Document type Book
    Note Unterschiede zwischen dem gedruckten Dokument und der elektronischen Dokumentversion können nicht ausgeschlossen werden
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  3. Article: Measurement of the tensor structure function b1 of the deuteron.

    Airapetian, A / Akopov, N / Akopov, Z / Amarian, M / Ammosov, V V / Andrus, A / Aschenauer, E C / Augustyniak, W / Avakian, R / Avetissian, A / Avetissian, E / Bailey, P / Balin, D / Baturin, V / Beckmann, M / Belostotski, S / Bernreuther, S / Bianchi, N / Blok, H P /
    Böttcher, H / Borissov, A / Borysenko, A / Bouwhuis, M / Brack, J / Brüll, A / Bryzgalov, V / Capitani, G P / Chen, T / Chiang, H C / Ciullo, G / Contalbrigo, M / Dalpiaz, P F / De Leo, R / Demey, M / De Nardo, L / De Sanctis, E / Devitsin, E / Di Nezza, P / Dreschler, J / Düren, M / Ehrenfried, M / Elalaoui-Moulay, A / Elbakian, G / Ellinghaus, F / Elschenbroich, U / Fabbri, R / Fantoni, A / Fechtchenko, A / Felawka, L / Fox, B / Frullani, S / Gapienko, G / Gapienko, V / Garibaldi, F / Garrow, K / Garutti, E / Gaskell, D / Gavrilov, G / Gharibyan, V / Graw, G / Grebeniouk, O / Greeniaus, L G / Gregor, I M / Hafidi, K / Hartig, M / Hasch, D / Heesbeen, D / Henoch, M / Hertenberger, R / Hesselink, W H A / Hillenbrand, A / Hoek, M / Holler, Y / Hommez, B / Iarygin, G / Ivanilov, A / Izotov, A / Jackson, H E / Jgoun, A / Kaiser, R / Kinney, E / Kisselev, A / Kopytin, M / Korotkov, V / Kozlov, V / Krauss, B / Krivokhijine, V G / Lagamba, L / Lapikás, L / Laziev, A / Lenisa, P / Liebing, P / Linden-Levy, L A / Lipka, K / Lorenzon, W / Lu, H / Lu, J / Lu, S / Ma, B-Q / Maiheu, B / Makins, N C R / Mao, Y / Marianski, B / Marukyan, H / Masoli, F / Mexner, V / Meyners, N / Mikloukho, O / Miller, C A / Miyachi, Y / Muccifora, V / Nagaitsev, A / Nappi, E / Naryshkin, Y / Nass, A / Negodaev, M / Nowak, W-D / Oganessyan, K / Ohsuga, H / Pickert, N / Potashov, S / Potterveld, D H / Raithel, M / Reggiani, D / Reimer, P E / Reischl, A / Reolon, A R / Riedl, C / Rith, K / Rosner, G / Rostomyan, A / Rubacek, L / Rubin, J / Ryckbosch, D / Salomatin, Y / Sanjiev, I / Savin, I / Schäfer, A / Schill, C / Schnell, G / Schüler, K P / Seele, J / Seidl, R / Seitz, B / Shanidze, R / Shearer, C / Shibata, T-A / Shutov, V / Simani, M C / Sinram, K / Stancari, M / Statera, M / Steffens, E / Steijger, J J M / Stenzel, H / Stewart, J / Stinzing, F / Stösslein, U / Tait, P / Tanaka, H / Taroian, S / Tchuiko, B / Terkulov, A / Tkabladze, A / Trzcinski, A / Tytgat, M / Vandenbroucke, A / van der Nat, P B / van der Steenhoven, G / Vetterli, M C / Vikhrov, V / Vincter, M G / Vogel, C / Vogt, M / Volmer, J / Weiskopf, C / Wendland, J / Wilbert, J / Ye, Y / Ye, Z / Yen, S / Zihlmann, B / Zupranski, P

    Physical review letters

    2005  Volume 95, Issue 24, Page(s) 242001

    Abstract: The Hermes experiment has investigated the tensor spin structure of the deuteron using the 27.6 GeV/c positron beam of DESY HERA. The use of a tensor-polarized deuteron gas target with only a negligible residual vector polarization enabled the first ... ...

    Abstract The Hermes experiment has investigated the tensor spin structure of the deuteron using the 27.6 GeV/c positron beam of DESY HERA. The use of a tensor-polarized deuteron gas target with only a negligible residual vector polarization enabled the first measurement of the tensor asymmetry A(d)zz and the tensor structure function b(d)1 for average values of the Bjorken variable 0.01< <x> <0.45 and of the negative of the squared four-momentum transfer 0.5 GeV2 < <Q2> <5 GeV2. The quantities A(d)zz and b(d)1 are found to be nonzero. The rise of b(d)1 for decreasing values of x can be interpreted to originate from the same mechanism that leads to nuclear shadowing in unpolarized scattering.
    Language English
    Publishing date 2005-12-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.95.242001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target.

    Airapetian, A / Akopov, N / Akopov, Z / Amarian, M / Andrus, A / Aschenauer, E C / Augustyniak, W / Avakian, R / Avetissian, A / Avetissian, E / Bacchetta, A / Bailey, P / Balin, D / Beckmann, M / Belostotski, S / Bianchi, N / Blok, H P / Böttcher, H / Borissov, A /
    Borysenko, A / Bouwhuis, M / Brüll, A / Bryzgalov, V / Capitani, G P / Cappiluppi, M / Chen, T / Ciullo, G / Contalbrigo, M / Dalpiaz, P F / Leo, R De / Demey, M / Nardo, L De / Sanctis, E De / Devitsin, E / Nezza, P Di / Düren, M / Ehrenfried, M / Elalaoui-Moulay, A / Elbakian, G / Ellinghaus, F / Elschenbroich, U / Fabbri, R / Fantoni, A / Fechtchenko, A / Felawka, L / Frullani, S / Gapienko, G / Gapienko, V / Garibaldi, F / Garrow, K / Gavrilov, G / Gharibyan, V / Grebeniouk, O / Gregor, I M / Hadjidakis, C / Hafidi, K / Hartig, M / Hasch, D / Henoch, M / Hesselink, W H A / Hillenbrand, A / Hoek, M / Holler, Y / Hommez, B / Hristova, I / Iarygin, G / Ilyichev, A / Ivanilov, A / Izotov, A / Jackson, H E / Jgoun, A / Kaiser, R / Kinney, E / Kisselev, A / Kobayashi, T / Kopytin, M / Korotkov, V / Kozlov, V / Krauss, B / Krivokhijine, V G / Lagamba, L / Lapikás, L / Laziev, A / Lenisa, P / Liebing, P / Linden-Levy, L A / Lorenzon, W / Lu, H / Lu, J / Lu, S / Ma, B-Q / Maiheu, B / Makins, N C R / Mao, Y / Marianski, B / Marukyan, H / Masoli, F / Mexner, V / Meyners, N / Michler, T / Mikloukho, O / Miller, C A / Miyachi, Y / Muccifora, V / Nagaitsev, A / Nappi, E / Naryshkin, Y / Nass, A / Negodaev, M / Nowak, W-D / Oganessyan, K / Ohsuga, H / Osborne, A / Pickert, N / Potterveld, D H / Raithel, M / Reggiani, D / Reimer, P E / Reischl, A / Reolon, A R / Riedl, C / Rith, K / Rosner, G / Rostomyan, A / Rubacek, L / Rubin, J / Ryckbosch, D / Salomatin, Y / Sanjiev, I / Savin, I / Schäfer, A / Schill, C / Schnell, G / Schüler, K P / Seele, J / Seidl, R / Seitz, B / Shanidze, R / Shearer, C / Shibata, T-A / Shutov, V / Sinram, K / Sommer, W / Stancari, M / Statera, M / Steffens, E / Steijger, J J M / Stenzel, H / Stewart, J / Stinzing, F / Tait, P / Tanaka, H / Taroian, S / Tchuiko, B / Terkulov, A / Trzcinski, A / Tytgat, M / Vandenbroucke, A / van der Nat, P B / van der Steenhoven, G / van Haarlem, Y / Vetterli, M C / Vikhrov, V / Vincter, M G / Vogel, C / Volmer, J / Wang, S / Wendland, J / Wilbert, J / Smit, G Ybeles / Ye, Y / Ye, Z / Yen, S / Zihlmann, B / Zupranski, P

    Physical review letters

    2005  Volume 94, Issue 1, Page(s) 12002

    Abstract: Single-spin asymmetries for semi-inclusive electroproduction of charged pions in deep-inelastic scattering of positrons are measured for the first time with transverse target polarization. The asymmetry depends on the azimuthal angles of both the pion ( ... ...

    Abstract Single-spin asymmetries for semi-inclusive electroproduction of charged pions in deep-inelastic scattering of positrons are measured for the first time with transverse target polarization. The asymmetry depends on the azimuthal angles of both the pion (phi) and the target spin axis (phi(S)) about the virtual-photon direction and relative to the lepton scattering plane. The extracted Fourier component sin((phi+phi(S))(pi)(UT) is a signal of the previously unmeasured quark transversity distribution, in conjunction with the Collins fragmentation function, also unknown. The component sin((phi-phi(S)(pi)(UT) arises from a correlation between the transverse polarization of the target nucleon and the intrinsic transverse momentum of quarks, as represented by the previously unmeasured Sivers distribution function. Evidence for both signals is observed, but the Sivers asymmetry may be affected by exclusive vector meson production.
    Language English
    Publishing date 2005-01-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.94.012002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Flavor decomposition of the sea-quark helicity distributions in the nucleon from semiinclusive deep inelastic scattering.

    Airapetian, A / Akopov, N / Akopov, Z / Amarian, M / Ammosov, V V / Andrus, A / Aschenauer, E C / Augustyniak, W / Avakian, R / Avetissian, A / Avetissian, E / Bailey, P / Baturin, V / Baumgarten, C / Beckmann, M / Belostotski, S / Bernreuther, S / Bianchi, N / Blok, H P /
    Böttcher, H / Borissov, A / Bouwhuis, M / Brack, J / Brüll, A / Bryzgalov, V / Capitani, G P / Chiang, H C / Ciullo, G / Contalbrigo, M / Dalpiaz, P F / De Leo, R / De Nardo, L / De Sanctis, E / Devitsin, E / Di Nezza, P / Düren, M / Ehrenfried, M / Elalaoui-Moulay, A / Elbakian, G / Ellinghaus, F / Elschenbroich, U / Ely, J / Fabbri, R / Fantoni, A / Fechtchenko, A / Felawka, L / Fox, B / Franz, J / Frullani, S / Gärber, Y / Gapienko, G / Gapienko, V / Garibaldi, F / Garrow, K / Garutti, E / Gaskell, D / Gavrilov, G / Gharibyan, V / Graw, G / Grebeniouk, O / Greeniaus, L G / Hafidi, K / Hartig, M / Hasch, D / Heesbeen, D / Henoch, M / Hertenberger, R / Hesselink, W H A / Hillenbrand, A / Hoek, M / Holler, Y / Hommez, B / Iarygin, G / Ivanilov, A / Izotov, A / Jackson, H E / Jgoun, A / Kaiser, R / Kinney, E / Kisselev, A / Königsmann, K / Kopytin, M / Korotkov, V / Kozlov, V / Krauss, B / Krivokhijine, V G / Lagamba, L / Lapikás, L / Laziev, A / Lenisa, P / Liebing, P / Lindemann, T / Lipka, K / Lorenzon, W / Lu, J / Maiheu, B / Makins, N C R / Marianski, B / Marukyan, H / Masoli, F / Mexner, V / Meyners, N / Mikloukho, O / Miller, C A / Miyachi, Y / Muccifora, V / Nagaitsev, A / Nappi, E / Naryshkin, Y / Nass, A / Negodaev, M / Nowak, W-D / Oganessyan, K / Ohsuga, H / Orlandi, G / Pickert, N / Potashov, S / Potterveld, D H / Raithel, M / Reggiani, D / Reimer, P E / Reischl, A / Reolon, A R / Riedl, C / Rith, K / Rosner, G / Rostomyan, A / Rubacek, L / Ryckbosch, D / Salomatin, Y / Sanjiev, I / Savin, I / Scarlett, C / Schäfer, A / Schill, C / Schnell, G / Schüler, K P / Schwind, A / Seele, J / Seidl, R / Seitz, B / Shanidze, R / Shearer, C / Shibata, T-A / Shutov, V / Simani, M C / Sinram, K / Stancari, M / Statera, M / Steffens, E / Steijger, J J M / Stewart, J / Stösslein, U / Tait, P / Tanaka, H / Taroian, S / Tchuiko, B / Terkulov, A / Tkabladze, A / Trzcinski, A / Tytgat, M / Vandenbroucke, A / Van Der Nat, P / Van Der Steenhoven, G / Vetterli, M C / Vikhrov, V / Vincter, M G / Visser, J / Vogel, C / Vogt, M / Volmer, J / Weiskopf, C / Wendland, J / Wilbert, J / Ybeles Smit, G / Yen, S / Zihlmann, B / Zohrabian, H / Zupranski, P

    Physical review letters

    2004  Volume 92, Issue 1, Page(s) 12005

    Abstract: Double-spin asymmetries of semiinclusive cross sections for the production of identified pions and kaons have been measured in deep inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those ... ...

    Abstract Double-spin asymmetries of semiinclusive cross sections for the production of identified pions and kaons have been measured in deep inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with reanalyzed previous data for identified pions from a hydrogen target. These distributions are consistent with zero for all three sea flavors. A recently predicted flavor asymmetry in the polarization of the light quark sea appears to be disfavored by the data.
    Language English
    Publishing date 2004-01-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.92.012005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Q2 dependence of nuclear transparency for exclusive rho0 production.

    Airapetian, A / Akopov, N / Akopov, Z / Amarian, M / Ammosov, V V / Andrus, A / Aschenauer, E C / Augustyniak, W / Avakian, R / Avetissian, A / Avetissian, E / Bailey, P / Baturin, V / Baumgarten, C / Beckmann, M / Belostotski, S / Bernreuther, S / Bianchi, N / Blok, H P /
    Böttcher, H / Borissov, A / Bouwhuis, M / Brack, J / Brüll, A / Brunn, I / Capitani, G P / Chiang, H C / Ciullo, G / Contalbrigo, M / Court, G R / Dalpiaz, P F / De Leo, R / De Nardo, L / De Sanctis, E / Devitsin, E / Di Nezza, P / Düren, M / Ehrenfried, M / Elalaoui-Moulay, A / Elbakian, G / Ellinghaus, F / Elschenbroich, U / Ely, J / Fabbri, R / Fantoni, A / Fechtchenko, A / Felawka, L / Fox, B / Franz, J / Frullani, S / Gärber, Y / Gapienko, G / Gapienko, V / Garibaldi, F / Garutti, E / Gaskell, D / Gavrilov, G / Gharibyan, V / Graw, G / Grebeniouk, O / Greeniaus, L G / Haeberli, W / Hafidi, K / Hartig, M / Hasch, D / Heesbeen, D / Henoch, M / Hertenberger, R / Hesselink, W H A / Hillenbrand, A / Holler, Y / Hommez, B / Iarygin, G / Izotov, A / Jackson, H E / Jgoun, A / Kaiser, R / Kinney, E / Kisselev, A / Königsmann, K / Kolster, H / Kopytin, M / Korotkov, V / Kozlov, V / Krauss, B / Krivokhijine, V G / Lagamba, L / Lapikás, 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 / Miyachi, Y / 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, D H / Raithel, M / Reggiani, D / Reimer, P / Reischl, A / Reolon, A R / Rith, K / Rosner, G / Rostomyan, A / Ryckbosch, D / Sanjiev, I / Savin, I / Scarlett, C / Schäfer, A / Schill, C / Schnell, G / Schüler, 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 / Stösslein, U / Tanaka, H / Taroian, S / Tchuiko, B / Terkulov, A / Tessarin, S / Thomas, E / Tkabladze, A / Trzcinski, A / Tytgat, M / Urciuoli, G M / Van Der Nat, P / Van Der Steenhoven, G / Van De Vyver, R / Vetterli, M C / Vikhrov, V / Vincter, M G / Visser, J / Vogt, M / Volmer, J / Weiskopf, C / Wendland, J / Wilbert, J / Wise, T / Yen, S / Yoneyama, S / Zihlmann, B / Zohrabian, H / Zupranski, P

    Physical review letters

    2003  Volume 90, Issue 5, Page(s) 52501

    Abstract: Exclusive coherent and incoherent electroproduction of the rho(0) meson from 1H and 14N targets has been studied at the HERMES experiment as a function of coherence length (l(c)), corresponding to the lifetime of hadronic fluctuations of the virtual ... ...

    Abstract Exclusive coherent and incoherent electroproduction of the rho(0) meson from 1H and 14N targets has been studied at the HERMES experiment as a function of coherence length (l(c)), corresponding to the lifetime of hadronic fluctuations of the virtual photon, and squared four-momentum of the virtual photon (-Q2). The ratio of 14N to 1H cross sections per nucleon, called nuclear transparency, was found to increase (decrease) with increasing l(c) for coherent (incoherent) rho(0) electroproduction. For fixed l(c), a rise of nuclear transparency with Q2 is observed for both coherent and incoherent rho(0) production, which is in agreement with theoretical calculations of color transparency.
    Language English
    Publishing date 2003-02-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.90.052501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Evidence for quark-hadron duality in the proton spin asymmetry A1.

    Airapetian, A / Akopov, N / Akopov, Z / Amarian, M / Ammosov, V V / Aschenauer, E C / Avakian, H / Avakian, R / Avetissian, A / Avetissian, E / Bailey, P / Baturin, V / Baumgarten, C / Beckmann, M / Belostotski, S / Bernreuther, S / Bianchi, N / Blok, H P / Böttcher, H /
    Borissov, A / Bouhali, O / Bouwhuis, M / Brack, J / Brauksiepe, S / Brüll, A / Brunn, I / Bulten, H J / Capitani, G P / Cisbani, E / 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 / Düren, M / Ehrenfried, M / Elbakian, G / Ellinghaus, F / Elschenbroich, U / Ely, J / Fabbri, R / Fantoni, A / Fechtchenko, A / Felawka, L / Filippone, B W / Fischer, H / Fox, B / Franz, J / Frullani, S / Gärber, Y / 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 / Hofman, G / Holler, Y / Holt, R J / Hommez, B / Iarygin, G / Izotov, A / Jackson, H E / Jgoun, A / Jung, P / Kaiser, R / Kinney, E / Kisselev, A / Kitching, P / Königsmann, K / Kolster, H / Kopytin, M / Korotkov, V / Kotik, E / Kozlov, V / Krauss, B / Krivokhijine, V G / Kyle, G / Lagamba, L / Laziev, A / Lenisa, P / Liebing, P / Lindemann, T / Lorenzon, W / Maas, A / 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 / Orlandi, G / Podiatchev, S / Potashov, S / Potterveld, D H / Raithel, M / Rappoport, V / Reggiani, D / Reimer, P / Reischl, A / Reolon, A R / Rith, K / Rostomyan, A / Ryckbosch, D / Sakemi, Y / Sanjiev, I / Sato, F / Savin, I / Scarlett, C / Schäfer, A / Schill, C / Schmidt, F / Schnell, G / Schüler, K P / Schwind, A / Seibert, J / Seitz, B / Shanidze, R / Shibata, T-A / Shutov, V / Simani, M C / Sinram, K / Stancari, M / Steffens, E / Steijger, J J M / Stewart, J / Stösslein, U / Suetsugu, K / Taroian, S / Terkulov, A / Tessarin, S / Thomas, E / Tipton, B / Tytgat, M / Urciuoli, G M / van den Brand, J F J / 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

    Physical review letters

    2003  Volume 90, Issue 9, Page(s) 92002

    Abstract: Spin-dependent lepton-nucleon scattering data have been used to investigate the validity of the concept of quark-hadron duality for the spin asymmetry A1. Longitudinally polarized positrons were scattered off a longitudinally polarized hydrogen target ... ...

    Abstract Spin-dependent lepton-nucleon scattering data have been used to investigate the validity of the concept of quark-hadron duality for the spin asymmetry A1. Longitudinally polarized positrons were scattered off a longitudinally polarized hydrogen target for values of Q2 between 1.2 and 12 GeV2 and values of W2 between 1 and 4 GeV2. The average double-spin asymmetry in the nucleon resonance region is found to agree with that measured in deep-inelastic scattering at the same values of the Bjorken scaling variable x. This finding implies that the description of A1 in terms of quark degrees of freedom is valid also in the nucleon resonance region for values of Q2 above 1.6 GeV2.
    Language English
    Publishing date 2003-03-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.90.092002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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