A measurement of the psi ' to j/psi production ratio in 920 gev proton-nucleus interactions
文献类型：期刊论文
| 作者 | Abt, I.; Adams, M.; Agari, M.; Albrecht, H.; Aleksandrov, A.; Amaral, V.; Amorim, A.; Aplin, S. J.; Aushev, V.; Bagaturia, Y. |
| 刊名 | European physical journal c
 |
| 出版日期 | 2007 |
| 卷号 | 49期号:2页码:545-558 |
| ISSN号 | 1434-6044 |
| DOI | 10.1140/epjc/s10052-006-0139-9 |
| 通讯作者 | Abt, i.() |
| 英文摘要 | Ratios of the psi' over the j/psi production cross sections in the dilepton channel for c, ti and w targets have been measured in 920 gev proton-nucleus interactions with the hera-b detector at the hera storage ring. the psi' and j/psi states were reconstructed in both the mu(+) mu(-) and the e(+) e(-) decay modes. the measurements covered the kinematic range -0.35 <= x(f)<= 0.1 with transverse momentum >= 4.5 gev/c. the angular dependence of the ratio has been used to measure the difference of the psi' and j/psi polarization. all results for the muon and electron decay channels are in good agreement: their ratio, averaged over all events, is r-psi'(mu)/r-psi'(e)=1.00 +/- 0.08 +/- 0.04. this result constitutes a new, direct experimental constraint on the double ratio of branching fractions, (b' (mu)b(e))/(b(mu)b'(e)), of psi' and j/psi in the two channels. the psi' to j/psi production ratio is almost constant in the covered x(f) range and shows a slow increase with p(t). |
| WOS关键词 | HERA-B EXPERIMENT ; FIXED-TARGET EXPERIMENTS ; OUTER TRACKER DETECTOR ; FRONT-END ELECTRONICS ; CHARMONIUM PRODUCTION ; HADRONIC COLLISIONS ; INELASTIC PHOTOPRODUCTION ; MUON DETECTOR ; QUARKONIUM ; UPSILON |
| 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:000243973100010 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2175864 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Abt, I. |
| 作者单位 | 1.Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany 2.NIKHEF H, NL-1009 DB Amsterdam, Netherlands 3.Univ Barcelona, Fac Phys, Dept ECM, E-08028 Barcelona, Spain 4.Inst High Energy Phys, Beijing 100039, Peoples R China 5.Tsing Hua Univ, Inst Engn Phys, Beijing 100084, Peoples R China 6.Humboldt Univ, Inst Phys, D-12489 Berlin, Germany 7.Univ Bologna, Dipartmento Fis, I-40126 Bologna, Italy 8.Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy 9.Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA 10.LIP Coimbra, P-3004516 Coimbra, Portugal |
| 推荐引用方式 GB/T 7714 | Abt, I.,Adams, M.,Agari, M.,et al. A measurement of the psi ' to j/psi production ratio in 920 gev proton-nucleus interactions[J]. European physical journal c,2007,49(2):545-558. |
| APA | Abt, I..,Adams, M..,Agari, M..,Albrecht, H..,Aleksandrov, A..,...&Zoccoli, A..(2007).A measurement of the psi ' to j/psi production ratio in 920 gev proton-nucleus interactions.European physical journal c,49(2),545-558. |
| MLA | Abt, I.,et al."A measurement of the psi ' to j/psi production ratio in 920 gev proton-nucleus interactions".European physical journal c 49.2(2007):545-558. |
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