Inclusive Σ- and Λ(1520) production in hadronic Z decays

被引：19

作者：

Abreu, P ^{[1
]}

Adam, W

Adye, T

Adzic, P

Ajinenko, I

Albrecht, Z

Alderweireld, T

Alekseev, GD

Alemany, R

Allmendinger, T

Allport, PP

Almehed, S

Amaldi, U

Amapane, N

Amato, S

Anassontzis, EG

Andersson, P

Andreazza, A

Andringa, S

Antilogus, P

Apel, WD

Arnoud, Y

Åsman, B

Augustin, JE

Augustinus, A

Baillon, P

Ballestrero, A

Bambade, P

Barao, F

Barbiellini, G

Barbier, R

Bardin, DY

Barker, G

Baroncelli, A

Battaglia, M

Baubillier, M

Becks, KH

Begalli, M

Behrmann, A

Beilliere, P

Belokopytov, Y

Benekos, NC

Benvenuti, AC

Berat, C

Berggren, M

Bertrand, D

Besancon, M

Bigi, M

Bilenky, MS

Bizouard, MA

机构：

[1] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[2] ULB, VUB, IIHE, B-1050 Brussels, Belgium

[3] Univ Instelling Antwerp, Dept Phys, B-2610 Antwerp, Belgium

[4] Univ Mons, Fac Sci, B-7000 Mons, Belgium

[5] Univ Athens, Phys Lab, GR-10680 Athens, Greece

[6] Univ Bergen, Dept Phys, NO-5007 Bergen, Norway

[7] Univ Bologna, Dipartmento Fis, I-40126 Bologna, Italy

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

[9] Ctr Brasileiro Pesquisas Fis, BR-22290 Rio De Janeiro, Brazil

[10] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, BR-22453 Rio De Janeiro, Brazil

[11] Univ Estado Rio De Janeiro, Inst Fis, Rio De Janeiro, Brazil

[12] Comenius Univ, Fac Math & Phys, SK-84215 Bratislava, Slovakia

[13] Coll France, Phys Corpusculaire Lab, IN2P3, CNRS, F-75231 Paris 05, France

[14] CERN, CH-1211 Geneva 23, Switzerland

[15] ULP, CNRS, IN2P3, Inst Rech Subatom, F-67037 Strasbourg, France

[16] Natl Ctr Sci Res Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece

[17] CAS, Div High Energy Phys, Inst Phys, FZU, CZ-18040 Prague 8, Czech Republic

[18] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy

[19] Ist Nazl Fis Nucl, I-16146 Genoa, Italy

[20] Univ Grenoble 1, CNRS, IN2P3, Inst Sci Nucl, F-38026 Grenoble, France

[21] Helsinki Inst Phys, FI-00014 Helsinki, Finland

[22] Joint Inst Nucl Res, RU-101000 Moscow, Russia

[23] Univ Karlsruhe, Inst Expt Kernphys, DE-76128 Karlsruhe, Germany

[24] Inst Nucl Phys, PL-30055 Krakow, Poland

[25] Univ Min & Met Krakow, PL-30055 Krakow, Poland

[26] Univ Paris Sud, Lab Accelerateur Lineaire, IN2P3, CNRS, F-91405 Orsay, France

[27] Univ Lancaster, Sch Phys & Chem, Lancaster LA1 4YB, England

[28] Inst Super Tecn, LIP, FCUL, P-1000 Lisbon, Portugal

[29] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England

[30] Univ Paris 06, CNRS, IN2P3, LPNHE, F-75252 Paris 05, France

[31] Univ Paris 07, CNRS, IN2P3, LPNHE, F-75252 Paris 05, France

[32] Lund Univ, Dept Phys, SE-22363 Lund, Sweden

[33] Univ Lyon 1, IPNL, IN2P3, CNRS, F-69622 Villeurbanne, France

[34] Univ Aix Marseille 2, CPP, IN2P3, CNRS, F-13288 Marseille 09, France

[35] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[36] Ist Nazl Fis Nucl, MILANO, I-20133 Milan, Italy

[37] Univ Milan, Dipartimento Fis, I-20126 Milan, Italy

[38] Ist Nazl Fis Nucl, MILANO, I-20126 Milan, Italy

[39] Niels Bohr Inst, DK-2100 Copenhagen 0, Denmark

[40] Charles Univ Prague, IPNP MFF, CZ-18000 Prague 8, Czech Republic

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

[42] Natl Tech Univ Athens, Dept Phys, GR-15773 Athens, Greece

[43] Univ Oslo, Dept Phys, NO-1000 Oslo 3, Norway

[44] Univ Oviedo, Dept Fis, ES-33007 Oviedo, Spain

[45] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[46] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy

[47] Ist Nazl Fis Nucl, I-35131 Padua, Italy

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

[49] Univ Roma Tor Vergata, Dipartimento Fis, I-00173 Rome, Italy

[50] Ist Nazl Fis Nucl, I-00173 Rome, Italy

来源：

PHYSICS LETTERS B | 2000年 / 475卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(00)00081-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Production of Sigma(-) and Lambda(1520) in hadronic Z decays has been measured using the DELPHI detector at LEP. The Sigma(-) is directly reconstructed as a charged track in the DELPHI microvertex detector and is identified by its Sigma --> n pi decay leading to a kink between the Sigma(-) and pi-track. The reconstruction of the Lambda(1520) resonance relies strongly on the particle identification capabilities of the barrel Ring Imaging Cherenkov detector and on the ionisation loss measurement of the TPC. Inclusive production spectra are measured for both particles. The production rates are measured to be [NSigma-/N-Z(had)] = 0.081 +/- 0.002 +/- 0.010, [N-Lambda(1520)/N-Z(had)] = 0.029 +/- 0.005 +/- 0.005. The production rate of the Lambda(1520) suggests that a large fraction of the stable baryons descend from orbitally excited baryonic states. It is shown that the baryon production rates in Z decays follow a universal phenomenological law related to isospin, strangeness and mass of the particles. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：429 / 447

页数：19

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