LG Greeniaus

Publications (7)3.95 Total impact

• Source

  Available from: Sarkis Taroian

  Article: Hard exclusive electroproduction of π+π− pairs

  A. Airapetian, N. Akopov, Z. Akopov, M Amarian, VV Ammosov, A Andrus, EC Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, [......], J Volmer, C. Weiskopf, J Wendland, J. Wilbert, GY Smit, Y Ye, Z Ye, S. Yen, B. Zihlmann, P. Zupranski
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  ABSTRACT: Hard exclusive electroproduction of π+π− pairs off hydrogen and deuterium targets has been studied by the HERMES experiment at DESY. Legendre moments 〈P1〉 and 〈P3〉 of the angular distributions of π+ mesons in the center-of-mass frame of the pair have been measured for the first time. Their dependence on the π+π− invariant mass can be understood as being due to the interference between relative P-wave (isovector) and S-, D-wave (isoscalar) states of the two pions. The increase in magnitude of 〈P1〉 as Bjorken x increases is interpreted in the framework of generalized parton distributions as an enhancement of flavour non-singlet exchange for larger values of x, which leads to a sizable admixture of isoscalar and isovector pion pairs. In addition, the interference between P-wave and D-wave states separately for transverse and longitudinal pion pairs has been studied. The data indicate that in the f2(1270) region at 〈Q2〉=3 GeV2 higher-twist effects can be as large as the leading-twist longitudinal component.
  Physics Letters B 10/2004; 599(3-4):212-222. · 3.95 Impact Factor
• Article: ATLAS: Technical proposal for a general-purpose p p experiment at the Large Hadron Collider at CERN

  ATLAS Collaboration, WW Armstrong, W Burris, DM Gingrich, P Green, LG Greeniaus, JC Hewlett, L Holm, JW McDonald, S Mullin, [......], K Hamacher, S. Kersten, G Lenzen, P. Middelkamp, S Uberschar, H Wahlen, H. Hakopian, V. Grabsky, A Vartapetian, E. Mnatsakanian
• Article: Q(2) dependence of nuclear transparency for exclusive rho(0) production

  A. Airapetian, N. Akopov, Z. Akopov, M Amarian, VV Ammosov, A Andrus, EC Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, [......], C. Weiskopf, J Wendland, J. Wilbert, T. Wise, S. Yen, S Yoneyama, B. Zihlmann, H. Zohrabian, P. Zupranski, HERMES Collaboration
• Article: Evidence for a narrow vertical bar S vertical bar=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction

  A. Airapetian, N. Akopov, Z. Akopov, M Amarian, VV Ammosov, A Andrus, EC Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, [......], J. Wilbert, GY Smit, Y Ye, Z Ye, Z. Yen, W Yu, B. Zihlmann, H. Zohrabian, P. Zupranski, HERMES Collaboration
• Source

  Available from: Vahagn Gharibyan

  Article: Quark helicity distributions in the nucleon for up, down, and strange quarks from semi-inclusive deep-inelastic scattering

  A. Airapetian, N. Akopov, Z. Akopov, M Amarian, VV Ammosov, A Andrus, EC Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, [......], J Volmer, C. Weiskopf, J Wendland, J. Wilbert, GY Smit, S. Yen, B. Zihlmann, H. Zohrabian, P. Zupranski, HERMES Collaboration
• Source

  Available from: Vahagn Gharibyan

  Article: Hard exclusive electroproduction of pi(+)pi(-) pairs

  A. Airapetian, N. Akopov, Z. Akopov, M Amarian, VV Ammosov, A Andrus, EC Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, [......], J Volmer, C. Weiskopf, J Wendland, J. Wilbert, GY Smit, Y Ye, Z Ye, S. Yen, B. Zihlmann, P. Zupranski
• Article: Measurement of the tensor structure function b(1) of the deuteron

  A. Airapetian, N. Akopov, Z. Akopov, M Amarian, VV Ammosov, A Andrus, EC Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, [......], M Vogt, J Volmer, C. Weiskopf, J Wendland, J. Wilbert, Y Ye, Z Ye, S. Yen, B. Zihlmann, P. Zupranski