Update of the search for charginos nearly mass-degenerate with the lightest neutralino

被引：14

作者：

Abreu, P

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] FCUL, IST, LIP, PT-1000 Lisbon, Portugal

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

[3] Univ Paris 06, CNRS, IN2P3, LPNHE, FR-75252 Paris 05, France

[4] Univ Paris 07, CNRS, IN2P3, LPNHE, FR-75252 Paris 05, France

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

[6] Univ Lyon 1, IPNL, CNRS, IN2P3, FR-69622 Villeurbanne, France

[7] Univ Aix Marseille 2, CPP, IN2P3, CNRS, FR-13288 Marseille 09, France

[8] Univ Milan, Dipartimento Fis, IT-20133 Milan, Italy

[9] INFN MILANO, IT-20133 Milan, Italy

[10] Univ Milano Bicocca, IT-20126 Milan, Italy

[11] INFN MILANO, IT-2016 Milan, Italy

[12] Niels Bohr Inst, DK-2100 Copenhagen O, Denmark

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

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

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

[16] Univ Oslo, Dept Phys, NO-1003 Oslo 3, Norway

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

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

[19] Univ Padua, Dipartimento Fis, IT-35131 Padua, Italy

[20] Ist Nazl Fis Nucl, IT-35131 Padua, Italy

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

[22] Univ Roma Tor Vergata, Dipartimento Fis, IT-00173 Rome, Italy

[23] Ist Nazl Fis Nucl, IT-00173 Rome, Italy

[24] Univ Roma 3, Dipartimento Fis, IT-00146 Rome, Italy

[25] Ist Nazl Fis Nucl, IT-00146 Rome, Italy

[26] CEA Saclay, DAPNIA, Serv Phys Particules, FR-91191 Gif Sur Yvette, France

[27] UC, CSIC, Inst Fis Cantabria, ES-39006 Santander, Spain

[28] Univ Roma La Sapienza, Dipartimento Fis, IT-00185 Rome, Italy

[29] Inst High Energy Phys, Protvino, Moscow Region, Russia

[30] Univ Ljubljana, Dept Phys, SI-1000 Ljubljana, Slovenia

[31] Jozef Stefan Inst, SI-1000 Ljubljana, Slovenia

[32] Nova Gorica Polytech, Lab Astroparticle Phys, SI-5000 Nova Gorica, Slovenia

[33] Stockholm Univ, Fysikum, SE-11385 Stockholm, Sweden

[34] Univ Turin, Dipartimento Fis Sperimentale, IT-10125 Turin, Italy

[35] Ist Nazl Fis Nucl, IT-10125 Turin, Italy

[36] Univ Trieste, Dipartimento Fis, IT-34127 Trieste, Italy

[37] Ist Nazl Fis Nucl, IT-34127 Trieste, Italy

[38] Univ Udine, Ist Fis, IT-33100 Udine, Italy

[39] Univ Fed Rio de Janeiro, BR-21945970 Rio De Janeiro, Brazil

[40] Uppsala Univ, Dept Radiat Sci, SE-75121 Uppsala, Sweden

[41] Univ Valencia, IFIC, Valencia CSIC, ES-46100 Burjassot, Valencia, Spain

[42] Univ Valencia, DFAMN, ES-46100 Burjassot, Valencia, Spain

[43] Osterr Akad Wissensch, Inst Hochenergiephys, AT-1050 Vienna, Austria

[44] Inst Nucl Studies, PL-00681 Warsaw, Poland

[45] Univ Warsaw, PL-00681 Warsaw, Poland

[46] Berg Univ Wuppertal, Fachbereich Phys, DE-42097 Wuppertal, Germany

[47] Iowa State Univ Sci & Technol, Dept Phys & Astron, Ames, IA 50011 USA

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

[49] Free Univ Brussels, ULB, IIHE, B-1050 Brussels, Belgium

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

来源：

PHYSICS LETTERS B | 2000年 / 485卷 / 1-3期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(00)00693-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The data collected by DELPHI in 1998 at the centre-of-mass energy of 189 GeV have been used to update the search for charginos nearly mass-degenerate with the lightest supersymmetric particle, which is assumed to be the lightest neutralino. Mass differences below Delta M = 3 GeV/c(2) are considered. No excess of events with respect to the Standard Model expectation has been observed, and exclusions in the plane of Delta M versus chargino mass are given. The new Delta M independent lower limit on the mass of the chargino is 62.4 GeV/c(2) in the higgsino scenario (which includes the gaugino mass unification scenario), if all sfermions are heavier than the lightest chargino. In the approximation of large sfermion masses the limit is 59.8 GeV/c(2), independently of the field content. (C) 2000 Published by Elsevier Science B.V.

引用

页码：95 / 106

页数：12

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