Angular distributions of leptons from j/psi's produced in 920 gev fixed-target proton-nucleus collisions
文献类型：期刊论文
| 作者 | Abt, I.24; Adams, M.11; Agari, M.14; Albrecht, H.13; Aleksandrov, A.30; Amaral, V.9; Amorim, A.9; Aplin, S. J.13; Aushev, V.17; Bagaturia, Y.13 |
| 刊名 | European physical journal c
 |
| 出版日期 | 2009-04-01 |
| 卷号 | 60期号:4页码:517-524 |
| ISSN号 | 1434-6044 |
| DOI | 10.1140/epjc/s10052-009-0957-7 |
| 通讯作者 | Abt, i.() |
| 英文摘要 | A study of the angular distributions of leptons from decays of j/psi's produced in p-c and p-w collisions at root s = 41.6 gev has been performed in the j/psi feynman-x region -0.34 < x(f) < 0.14 and for j/psi transverse momenta up to 5.4 gev/c. the data were collected by the hera-b experiment at the hera proton ring of the desy laboratory. the results, based on a clean selection of 2.3 x 10(5) j/psi's reconstructed in both the e(+)e(-) and mu(+)mu(-) decay channels, indicate that j/psi's are produced polarized. the magnitude of the effect is maximal at low p(t). for p(t) > 1 gev/c a significant dependence on the reference frame is found: the polar anisotropy is more pronounced in the collins-soper frame and almost vanishes in the helicity frame, where, instead, a significant azimuthal anisotropy arises. |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Particles & Fields |
| 语种 | 英语 |
| 出版者 | SPRINGER |
| WOS记录号 | WOS:000265215100001 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2175913 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Abt, I. |
| 作者单位 | 1.NIKHEF, NL-1009 DB Amsterdam, Netherlands 2.Univ Barcelona, Fac Phys, Dept ECM, E-08028 Barcelona, Spain 3.Inst High Energy Phys, Beijing 100039, Peoples R China 4.Tsinghua Univ, Inst Engn Phys, Beijing 100084, Peoples R China 5.Humboldt Univ, Inst Phys, D-12489 Berlin, Germany 6.Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy 7.Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy 8.Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA 9.LIP Coimbra, P-3004516 Coimbra, Portugal 10.Niels Bohr Inst, DK-2100 Copenhagen, Denmark |
| 推荐引用方式 GB/T 7714 | Abt, I.,Adams, M.,Agari, M.,et al. Angular distributions of leptons from j/psi's produced in 920 gev fixed-target proton-nucleus collisions[J]. European physical journal c,2009,60(4):517-524. |
| APA | Abt, I..,Adams, M..,Agari, M..,Albrecht, H..,Aleksandrov, A..,...&Zoccoli, A..(2009).Angular distributions of leptons from j/psi's produced in 920 gev fixed-target proton-nucleus collisions.European physical journal c,60(4),517-524. |
| MLA | Abt, I.,et al."Angular distributions of leptons from j/psi's produced in 920 gev fixed-target proton-nucleus collisions".European physical journal c 60.4(2009):517-524. |
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