Measurement of σχc2B(χc2→J/ψγ)/σχc1B(χc1→J/ψγ) in p(p)over-bar collisions at √s=1.96 TeV

被引：42

作者：

Abulencia, A. ^{[1
]}

Adelman, J.

Affolder, T.

Akimoto, T.

Albrow, M. G.

Ambrose, D.

Amerio, S.

Amidei, D.

Anastassov, A.

Anikeev, K.

Annovi, A.

Antos, J.

Aoki, M.

Apollinari, G.

Arguin, J. -F.

Arisawa, T.

Artikov, A.

Ashmanskas, W.

Attal, A.

Azfar, F.

Azzi-Bacchetta, P.

Azzurri, P.

Bacchetta, N.

Badgett, W.

Barbaro-Galtieri, A.

Barnes, V. E.

Barnett, B. A.

Baroiant, S.

Bartsch, V.

Bauer, G.

Bedeschi, F.

Behari, S.

Belforte, S.

Bellettini, G.

Bellinger, J.

Belloni, A.

Benjamin, D.

Beretvas, A.

Beringer, J.

Berry, T.

Bhatti, A.

Binkley, M.

Bisello, D.

Blair, R. E.

Blocker, C.

Blumenfeld, B.

Bocci, A.

Bodek, A.

Boisvert, V.

Bolla, G.

机构：

[1] Okayama Univ, Okayama 7008530, Japan

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 23期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1103/PhysRevLett.98.232001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measure the ratio of cross section times branching fraction, R-p=sigma B-chi c2(chi(c2)-> J/psi gamma)/sigma B-chi c1(chi(c1)-> J/psi gamma), in 1.1 fb(-1) of p (p) over bar collisions at root s=1.96 TeV. This measurement covers the kinematic range p(T)(J/psi)> 4.0 GeV/c, |eta(J/psi)< 1.0, and p(T)(gamma)> 1.0 GeV/c. For events due to prompt processes, we find R-p=0.395 +/- 0.016(stat)+/- 0.015(syst). This result represents a significant improvement in precision over previous measurements of prompt chi(c1,2) hadro production.

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