独家π⁰电产生结构函数的测量及其与横向性GPD的关系
高能物理 - 实验
2012-09-25 v2 高能物理 - 唯象学
核实验
摘要
在束流能量为5.75 GeV下，利用杰斐逊实验室CLAS谱仪测量了独家π⁰电产生。在Q²从1.0到4.6 GeV²、-t高达2 GeV²、x_B从0.1到0.58的范围内，在超过1800个运动学点（Q², x_B, t, φ_π）测量了微分截面。对于17个Q²和x_B组合中的每一个，提取了结构函数σ_T+εσ_L、σ_TT和σ_LT作为t的函数。将数据与两个基于手袋的计算直接比较，包括纵向和横向性GPD。仅包含纵向GPD会非常强烈地低估σ_T+εσ_L，并且无法解释σ_TT和σ_LT，而包含横向性GPD使计算与数据显著更好地吻合。对核子螺旋度翻转和非翻转过程的相对贡献非常敏感。结果证实独家π⁰电产生提供了对横向性GPD的直接实验访问。
引用
@article{arxiv.1206.6355,
title = {Measurement of Exclusive $\pi^0$ Electroproduction Structure Functions and their Relationship to Transversity GPDs},
author = {CLAS Collaboration and I. Bedlinskiy and V. Kubarovsky and S. Niccolai and P. Stoler and K. P. Adhikari and M. Aghasyan and M. J. Amaryan and M. Anghinolfi and H. Avakian and H. Baghdasaryan and J. Ball and N. A. Baltzell and M. Battaglieri and R. P. Bennett and A. S. Biselli and C. Bookwalter and S. Boiarinov and W. J. Briscoe and W. K. Brooks and V. D. Burkert and D. S. Carman and A. Celentano and S. Chandavar and G. Charles and M. Contalbrigo and V. Crede and A. D'Angelo and A. Daniel and N. Dashyan and R. De Vita and E. De Sanctis and A. Deur and C. Djalali and D. Doughty and R. Dupre and H. Egiyan and A. El Alaoui and L. El Fassi and L. Elouadrhiri and P. Eugenio and G. Fedotov and S. Fegan and J. A. Fleming and T. A. Forest and M. Garçon and N. Gevorgyan and K. L. Giovanetti and F. X. Girod and W. Gohn and R. W. Gothe and L. Graham and K. A. Griffioen and B. Guegan and M. Guidal and L. Guo and K. Hafidi and H. Hakobyan and C. Hanretty and D. Heddle and K. Hicks and M. Holtrop and Y. Ilieva and D. G. Ireland and B. S. Ishkhanov and E. L. Isupov and H. S. Jo and K. Joo and D. Keller and M. Khandaker and P. Khetarpal and A. Kim and W. Kim and F. J. Klein and S. Koirala and A. Kubarovsky and S. E. Kuhn and S. V. Kuleshov and N. D. Kvaltine and K. Livingston and H. Y. Lu and I. J. D. MacGregor and Y. Mao and N. Markov and D. Martinez and M. Mayer and B. McKinnon and C. A. Meyer and T. Mineeva and M. Mirazita and V. Mokeev and H. Moutarde and E. Munevar and C. Munoz Camacho and P. Nadel-Turonski and G. Niculescu and I. Niculescu and M. Osipenko and A. I. Ostrovidov and L. L. Pappalardo and R. Paremuzyan and K. Park and S. Park and E. Pasyuk and S. Anefalos Pereira and E. Phelps and S. Pisano and O. Pogorelko and S. Pozdniakov and J. W. Price and S. Procureur and Y. Prok and D. Protopopescu and A. J. R. Puckett and B. A. Raue and G. Ricco and D. Rimal and M. Ripani and G. Rosner and P. Rossi and F. Sabatié and M. S. Saini and C. Salgado and N. Saylor and D. Schott and R. A. Schumacher and E. Seder and H. Seraydaryan and Y. G. Sharabian and G. D. Smith and D. I. Sober and D. Sokhan and S. S. Stepanyan and S. Stepanyan and S. Strauch and M. Taiuti and W. Tang and C. E. Taylor and Ye Tian and S. Tkachenko and M. Ungaro and M. F. Vineyard and A. Vlassov and H. Voskanyan and E. Voutier and N. K. Walford and D. P. Watts and L. B. Weinstein and D. P. Weygand and M. H. Wood and N. Zachariou and J. Zhang and Z. W. Zhao and I. Zonta},
journal= {arXiv preprint arXiv:1206.6355},
year = {2012}
}
备注
6 pages, 2 figures