Search for exotic S =-2 baryons in p(p)over-bar collisions at √s=1.96 TeV

被引：6

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 D | 2007年 / 75卷 / 03期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1103/PhysRevD.75.032003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for a manifestly exotic S = -2 baryon state decaying to Xi(-) pi(-), and its neutral partner decaying to Xi(-) pi(+), has been performed using 220 pb(-1) of pp collisions at root s = 1.96 TeV collected by the Collider Detector at Fermilab. The Xi(-) trajectories were measured in a silicon tracker before their decay, resulting in a sample with low background and excellent position resolution. No evidence was found for S = -2 pentaquark candidates in the invariant mass range of 1600-2100 MeV/c(2). Upper limits on the product of pentaquark production cross section times its branching fraction to Xi(-) pi(+, -), relative to the cross section of the well-established Xi(1530) resonance, are presented for neutral and doubly negative candidates with p(T) > 2 GeV/c and vertical bar y vertical bar < 1 as a function of pentaquark mass. At 1862 MeV/c(2), these upper limits for neutral and doubly negative final states were found to be 3.2% and 1.7% at the 90% confidence level, respectively.

引用

页数：9

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