Evidence for a narrow baryonic state decaying to KS0p and KS0(p)over-bar in deep inelastic scattering at HERA

被引：240

作者：

Chekanov, S

Derrick, M

Loizides, JH

Magill, S

Miglioranzi, S

Musgrave, B

Repond, J

Yoshida, R

Mattingly, MCK

Pavel, N

Antonioli, P

Bari, G

Basile, M

Bellagamba, L

Boscherini, D

Bruni, A

Bruni, G

Romeo, GC

Cifarelli, L

Cindolo, F

Contin, A

Corradi, M

De Pasquale, S

Giusti, P

Iacobucci, G

Margotti, A

Montanari, A

Nania, R

Palmonari, F

Pesci, A

Rinaldi, L

Sartorelli, G

Zichichi, A

Aghuzumtsyan, G

Bartsch, D

Brock, I

Goers, S

Hartmann, H

Hilger, E

Irrgang, P

Jakob, HP

Kind, O

Meyer, U

Paul, E

Rautenberg, J

Renner, R

Stifutkin, A

Tandler, J

Voss, KC

Wang, M

机构：

[1] Argonne Natl Lab, Argonne, IL 60439 USA

[2] Andrews Univ, Berrien Springs, MI 49104 USA

[3] Humboldt Univ, Inst Phys, Berlin, Germany

[4] Univ Bologna, Bologna, Italy

[5] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[6] Univ Bonn, Inst Phys, D-5300 Bonn, Germany

[7] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[8] Univ Calabria, Dept Phys, I-87030 Commenda Di Rende, Italy

[9] Ist Nazl Fis Nucl, Cosenza, Italy

[10] Chonnam Natl Univ, Kwangju, South Korea

[11] Columbia Univ, Nevis Labs, New York, NY 10027 USA

[12] Inst Nucl Phys, Krakow, Poland

[13] Univ Sci & Technol, AGH, Fac Phys & Nucl Techniques, Krakow, Poland

[14] Jagiellonian Univ, Dept Phys, Krakow, Poland

[15] DESY, D-2000 Hamburg, Germany

[16] DESY, Zeuthen, Germany

[17] Univ Florence, Florence, Italy

[18] Ist Nazl Fis Nucl, I-50125 Florence, Italy

[19] Univ Freiburg, Fak Phys, D-7800 Freiburg, Germany

[20] Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland

[21] Univ Aegean, Dept Engn Management & Finance, Mitilini, Greece

[22] Univ Hamburg, Inst Expt Phys, Hamburg, Germany

[23] Univ London Imperial Coll Sci Technol & Med, High Energy Nucl Phys Grp, London, England

[24] Forschungszentrum Julich, Inst Kernphys, D-5170 Julich, Germany

[25] Kek Nat Lab High Energy Phys, Inst Particle & Nucl Studies, Tsukuba, Ibaraki 305, Japan

[26] Minist Educ & Sci Kazakhstan, Inst Phys & Technol, Alma Ata, Kazakhstan

[27] Kyungpook Natl Univ, Ctr High Energy Phys, Taegu, South Korea

[28] Catholic Univ Louvain, Inst Phys Nucl, B-1348 Louvain, Belgium

[29] Univ Autonoma Madrid, Dept Fis Teor, Madrid, Spain

[30] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[31] Meiji Gakuin Univ, Fac Gen Educ, Yokohama, Kanagawa, Japan

[32] Moscow Engn Phys Inst, Moscow 115409, Russia

[33] Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow, Russia

[34] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[35] Univ Amsterdam, Amsterdam, Netherlands

[36] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[37] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[38] Univ Oxford, Dept Phys, Oxford, England

[39] Ist Nazl Fis Nucl, Padua, Italy

[40] Univ Padua, Dipartimento Fis, Padua, Italy

[41] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[42] Polytech Univ, Sagamihara, Kanagawa, Japan

[43] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[44] Ist Nazl Fis Nucl, Rome, Italy

[45] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[46] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA

[47] Ewha Womans Univ, Dept Phys, Seoul, South Korea

[48] Tel Aviv Univ, Sch Phys, Raymond & Beverly Sackler Fac Exact Sci, IL-69978 Tel Aviv, Israel

[49] Tokyo Inst Technol, Dept Phys, Tokyo 152, Japan

[50] Univ Tokyo, Dept Phys, Tokyo 113, Japan

来源：

PHYSICS LETTERS B | 2004年 / 591卷 / 1-2期

关键词：

D O I：

10.1016/j.physletb.2004.04.024

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A resonance search has been made in the K(S)(0)p and K-S(0)(p) over bar invariant-mass spectrum measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb(-1). The search was performed in the central rapidity region of inclusive deep inelastic scattering at an ep centre-of-mass energy of 300-318 GeV for exchanged photon virtuality, Q(2), above 1 GeV2. Recent results from fixed-target experiments give evidence for a narrow baryon resonance decaying to K(+)n and K(S)(0)p, interpreted as a pentaquark. The results presented here support the existence of such state, with a mass of 1521.5 +/- 1.5(stat.)(-1.7)(+2.8)(syst.) MeV and a Gaussian width consistent with the experimental resolution of 2 MeV The signal is visible at high Q(2) and, for Q(2) > 20 GeV2, contains 221 +/- 48 events. The probability of a similar signal anywhere in the range 1500-1560 MeV arising from fluctuations of the background is below 6 x 10(-5). (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：7 / 22

页数：16

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