Hard exclusive electroproduction of π+π- pairs at HERMES

被引：0
|
作者：
Fabbri, R [1 ]
机构：
[1] NIKHEF, Amsterdam, Netherlands
来源：
SPIN 2004: 16TH INTERNATIONAL SPIN PHYSICS SYMPOSIUM | 2005年
关键词：
D O I：
10.1142/9789812701909_0082
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Hard exclusive electroproduction of pi(+)pi(-) pairs on hydrogen and deuterium targets has been studied by the HERMES experiment at DESY. Legendre moments < P(1)> and < P(3)> of the angular distributions of pi(+) mesons in the center-of-mass frame of the pair have been measured for the first time. Their dependence on the pi(+)pi(-) 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 < P(1)> as Bjorken x increases is interpreted in the framework of Generalized Parton Distributions as an enhancement of flavour non-singlet q (q) over bar 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 f(2)(1270) region at < Q(2)> = 3GeV(2), higher-twist effects can be as large as the leading-twist longitudinal component.
引用
收藏
页码：429 / 433
页数：5
相关论文
共 50 条
  • [31] Exclusive electroproduction of vector mesons in lepton nucleon scattering at the HERMES experiment
    Augustyniak, W.
    NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS, 2013, 245 : 207 - 214
  • [32] Hard Exclusive Measurements with a Polarised Target at HERMES
    Murray, Morgan
    2007 EUROPHYSICS CONFERENCE ON HIGH ENERGY PHYSICS, PTS 1-12, 2008, 110
  • [33] Single-spin asymmetries in exclusive electroproduction of pseudoscalar and vector mesons at HERMES
    Hasch, D
    INTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS, 2003, 698 : 651 - 654
  • [34] Hard exclusive pion electroproduction at backward angles with CLAS
    Park, K.
    Guidal, M.
    Gothe, R. W.
    Pire, B.
    Semenov-Tian-Shansky, K.
    Laget, J. -M.
    Adhikari, K. P.
    Adhikari, S.
    Akbar, Z.
    Avakian, H.
    Ball, J.
    Balossino, I.
    Baltzell, N. A.
    Barion, L.
    Battaglieri, M.
    Bedlinskiy, I.
    Biselli, A. S.
    Briscoe, W. J.
    Brooks, W. K.
    Burkert, V. D.
    Cao, F. T.
    Carman, D. S.
    Celentano, A.
    Charles, G.
    Chetry, T.
    Ciullo, G.
    Clark, L.
    Cole, P. L.
    Contalbrigo, M.
    Crede, V.
    D'Angelo, A.
    Dashyan, N.
    De Vita, R.
    De Sanctis, E.
    Defurne, M.
    Deur, A.
    Djalali, C.
    Dupre, R.
    Egiyan, H.
    El Alaoui, A.
    El Fassi, L.
    Elouadrhiri, L.
    Eugenio, P.
    Fedotov, G.
    Fersch, R.
    Filippi, A.
    Garcon, M.
    Ghandilyan, Y.
    Gilfoyle, G. P.
    Girod, F. X.
    PHYSICS LETTERS B, 2018, 780 : 340 - 345
  • [35] Measurement of hard exclusive reactions with a recoil detector at hermes
    Kaiser, R
    BARYONS 2002, 2003, : 392 - 395
  • [36] Hard exclusive reactions and generalized parton distributions at HERMES
    Dueren, M.
    NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS, 2009, 191 : 88 - 97
  • [37] Pion electroproduction at HERMES
    Muccifora, V
    ACTA PHYSICA POLONICA B, 2000, 31 (10-11): : 2403 - 2411
  • [38] Hard exclusive electroproduction of pseudoscalar mesons and the QCD axial anomaly
    Eides, MI
    Frankfurt, LL
    Strikman, MI
    PHYSICAL REVIEW D, 1999, 59 (11):
  • [39] Cross sections for hard exclusive electroproduction of π+ mesons on a hydrogen target
    Airapetian, A.
    Akopov, N.
    Akopov, Z.
    Aschenauer, E. C.
    Augustyniak, W.
    Avetissian, A.
    Avetissian, E.
    Barion, L.
    Belostotski, S.
    Bianchi, N.
    Blok, H. P.
    Bottcher, H.
    Bonomo, C.
    Borissov, A.
    Bryzgalov, V.
    Burns, J.
    Capiluppi, M.
    Capitani, G. P.
    Cisbani, E.
    Ciullo, G.
    Contalbrigo, M.
    Dalpiaz, P. F.
    Deconinck, W.
    De Leo, R.
    Demey, M.
    De Nardo, L.
    De Sanctis, E.
    Diefenthaler, M.
    Di Nezza, P.
    Dreschler, J.
    Duren, M.
    Ehrenfried, M.
    Elbakian, G.
    Ellinghaus, F.
    Fabbri, R.
    Fantoni, A.
    Frullani, S.
    Gabbert, D.
    Gapienko, G.
    Gapienko, V.
    Garibaldi, F.
    Gavrilov, G.
    Gharibyan, V.
    Giordano, E.
    Gliske, S.
    Guler, H.
    Hadjidakis, C.
    Hasch, D.
    Hill, G.
    Hillenbrand, A.
    PHYSICS LETTERS B, 2008, 659 (03) : 486 - 492
  • [40] Transversity distribution does not contribute to hard exclusive electroproduction of mesons
    Collins, JC
    Diehl, M
    PHYSICAL REVIEW D, 2000, 61 (11):
12345