arXiv 1206.56832012-06hep-ex

用运动学完全事件重建测量由深虚康普顿散射引起的束流螺旋度不对称性

Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction

The HERMES Collaboration, A. Airapetian, N. Akopov, Z. Akopov, E. C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, S. Belostotski, H. P. … 展开作者

The HERMES Collaboration, A. Airapetian, N. Akopov, Z. Akopov, E. C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, S. Belostotski, H. P. Blok, A. Borissov, J. Bowles, I. Brodski, V. Bryzgalov, J. Burns, M. Capiluppi, G. P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P. F. Dalpiaz, W. Deconinck, R. De Leo, L. De Nardo, E. De Sanctis, M. Diefenthaler, P. Di Nezza, M. Düren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, E. Etzelmüller, R. Fabbri, A. Fantoni, L. Felawka, S. Frullani, G. Gapienko, V. Gapienko, F. Garibaldi, G. Gavrilov, V. Gharibyan, F. Giordano, S. Gliske, M. Golembiovskaya, I. M. Gregor, H. Guler, M. Hartig, D. Hasch, A. Hillenbrand, M. Hoek, Y. Holler, I. Hristova, A. Ivanilov, H. E. Jackson, H. S. Jo, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, V. Korotkov, V. Kozlov, B. Krauss, P. Kravchenko, V. G. Krivokhijine, L. Lagamba, L. Lapikás, I. Lehmann, P. Lenisa, A. López Ruiz, W. Lorenzon, S. Lu, X. Lu, B. -Q. Ma, D. Mahon, N. C. R. Makins, S. I. Manaenkov, L. Manfré, Y. Mao, B. Marianski, A. Martinez de la Ossa, H. Marukyan, C. A. Miller, Y. Miyachi, A. Movsisyan, M. Murray, A. Mussgiller, E. Nappi, Y. Naryshkin, A. Nass, M. Negodaev, W. -D. Nowak, A. Osborne, L. L. Pappalardo, R. Perez-Benito, A. Petrosyan, P. E. Reimer, A. R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, L. Rubacek, J. Rubin, D. Ryckbosch, A. Schäfer, G. Schnell, K. P. Schüler, B. Seitz, C. Shearer, T. -A. Shibata, V. Shutov, M. Stancari, M. Statera, J. J. M. Steijger, J. Stewart, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, D. Veretennikov, V. Vikhrov, I. Vilardi, S. Wang, S. Yaschenko, Z. Ye, S. Yen, V. Zagrebelnyy, D. Zeiler, B. Zihlmann, P. Zupranski

DOI：: 10.1007/JHEP10(2012)042

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摘要：

在HERMES实验室测量了纵向极化HERA正电子束散射非极化氢靶产生纯光子的束螺旋度不对称性。这种不对称性是由深层的虚康普顿散射及其对Bethe-Heitler过程的干扰引起的。从由$ep\rightarrow epγ$事件组成的数据样本中提取束螺旋度不对称的方位角振幅，其中检测到包括反冲质子在内的最终状态中的所有粒子。反冲检测器的安装，虽然降低了实验的接受度，但允许消除来自$ep\rightarrow eNπγ$事件的背景，在以前的HERMES出版物中，估计该背景对信号的贡献平均约为12%。从当前数据样本中去除该背景显示出将前导不对称幅度的幅度增加0.054 +/- 0.016至-0.328 +/- 0.027（统计）。+/- 0.045（系统）。

英文摘要：

The beam-helicity asymmetry in exclusive electroproduction of real photons by the longitudinally polarized HERA positron beam scattering off an unpolarized hydrogen target is measured at HERMES. The asymmetry arises from deeply virtual Compton scattering and its interference with the Bethe--Heitler process. Azimuthal amplitudes of the beam-helicity asymmetry are extracted from a data sample consisting of $ep\rightarrow epγ$ events with detection of all particles in the final state including the recoiling proton. The installation of a recoil detector, while reducing the acceptance of the experiment, allows the elimination of background from $ep\rightarrow eNπγ$ events, which was estimated to contribute an average of about 12% to the signal in previous HERMES publications. The removal of this background from the present data sample is shown to increase the magnitude of the leading asymmetry amplitude by 0.054 +/- 0.016 to -0.328 +/- 0.027 (stat.) +/- 0.045 (syst.).

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