Confirmation of the doubly charmed baryon Εcc+(3520) via its decay to pD+K-

被引：273

作者：

Ocherashvili, A ^{[1
]}

Moinester, MA

Russ, J

Engelfried, J

Torres, I

Akgun, U

Alkhazov, G

Amaro-Reyes, J

Atamantchouk, AG

Ayan, AS

Balatz, MY

Bondar, NF

Cooper, PS

Dauwe, LJ

Davidenko, GV

Dersch, U

Dolgolenko, AG

Dzyubenko, GB

Edelstein, R

Emediato, L

Endler, AME

Eschrich, I

Escobar, CO

Evdokimov, AV

Filimonov, IS

Garcia, FG

Gaspero, M

Giller, I

Golovtsov, VL

Gouffon, P

Gülmez, E

Kangling, H

Iori, M

Jun, SY

Kaya, M

Kilmer, J

Kim, VT

Kochenda, LM

Konorov, I

Kozhevnikov, AP

Krivshich, AG

Krüger, H

Kubantsev, MA

Kubarovsky, V

Kulyavtsev, AI

Kuropatkin, NP

Kurshetsov, VF

Kushnirenko, A

Kwan, S

Lach, J

机构：

[1] Ball State Univ, Muncie, IN 47306 USA

[2] Bogazici Univ, TR-80815 Bebek, Turkey

[3] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[4] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil

[5] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[6] Inst High Energy Phys, Protvino, Russia

[7] Inst High Energy Phys, Beijing 100039, Peoples R China

[8] Inst Theoret & Expt Phys, Moscow 117259, Russia

[9] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[10] Moscow MV Lomonosov State Univ, Moscow, Russia

[11] Petersburg Nucl Phys Inst, St Petersburg, Russia

[12] Tel Aviv Univ, IL-69978 Tel Aviv, Israel

[13] Univ Autonoma San Luis Potosi, San Luis Potosi, Mexico

[14] Univ Fed Paraiba, BR-58059900 Joao Pessoa, Paraiba, Brazil

[15] Univ Bristol, Bristol BS8 1TL, Avon, England

[16] Univ Iowa, Iowa City, IA 52242 USA

[17] Univ Michigan, Flint, MI 48502 USA

[18] Univ Roma La Sapienza, Rome, Italy

[19] Ist Nazl Fis Nucl, Rome, Italy

[20] Univ Sao Paulo, Sao Paulo, Brazil

[21] Univ Trieste, Trieste, Italy

[22] Ist Nazl Fis Nucl, Trieste, Italy

来源：

PHYSICS LETTERS B | 2005年 / 628卷 / 1-2期

基金：

巴西圣保罗研究基金会; 美国国家科学基金会; 以色列科学基金会;

关键词：

doubly charmed baryon;

D O I：

10.1016/j.physletb.2005.09.043

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We observe a signal for the doubly charmed baryon Xi(cc)(+) in the decay mode Xi(cc)(+) -> pD(+)K(-) to complement the previous cc reported decay Xi(cc)(+) -> Lambda(c)(+)K(-)pi(+) in data from SELEX, the charm hadroproduction experiment at Fermilab. In this new decay mode we observe an excess of 5.62 events over a combinatoric background estimated by event mixing to be 1.38 +/- 0.13 events. The mixed background has Gaussian statistics, giving a signal significance of 4.8 sigma. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4 x 10(-4). The observed mass of this state is 3518 +/- 3 MeV/c(2), consistent with the published result. Averaging the two results gives a mass of 3518.7 +/- 1.7 MeV/c(2). The observation of this new weak decay mode confirms the previous SELEX suggestion that this state is a double charm baryon. The relative branching ratio for these two modes is 0.36 +/- 0.21. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：18 / 24

页数：7

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