Measurement of the Λb0 decay form factor

被引：34

作者：

Abdallah, J ^{[1
]}

Abreu, P

Adam, W

Adzic, P

Albrecht, T

Alderweireld, T

Alemany-Fernandez, R

Allmendinger, T

Allport, PP

Amaldi, U

Amapane, N

Amato, S

Anashkin, E

Andreazza, A

Andringa, S

Anjos, N

Antilogus, P

Apel, WD

Arnoud, Y

Ask, S

Asman, B

Augustin, JE

Augustinus, S

Baillon, P

Ballestrero, A

Bambade, P

Barbier, R

Bardin, D

Barker, G

Baroncelli, A

Battaglia, M

Baubillier, M

Becks, KH

Begalli, M

Behrmann, A

Ben-Haim, E

Benekos, N

Benvenuti, A

Berat, C

Berggren, M

Berntzon, L

Bertrand, D

Besancon, M

Besson, N

Bloch, D

Blom, M

Bluj, M

Bonesini, M

Boonekamp, M

Booth, PSL

机构：

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

[2] Univ Antwerp, Dept Phys, B-2610 Wilrijk, Belgium

[3] ULB VUB, IIHE, B-1050 Brussels, 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, Dipartimento Fis, IT-40126 Bologna, Italy

[8] INFN, IT-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 Estadual Rio De Janeiro, Inst Fis, Rio De Janeiro, Brazil

[12] CNRS, IN2P3, Coll France, Lab Phys Corpusculaire, FR-75231 Paris 05, France

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

[14] ULP, CNRS, IN2P3, Inst Rech Subatom,BP20, FR-67037 Strasbourg, France

[15] Democritos Natl Res Ctr Phys Sci, Inst Phys Nucl, GR-15310 Athens, Greece

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

[17] Univ Genoa, Dipartimento Fis, IT-16146 Genoa, Italy

[18] INFN, IT-16146 Genoa, Italy

[19] Univ Grenoble 1, CNRS, IN2P3, Inst Sci Nucl, FR-38026 Grenoble, France

[20] Univ Helsinki, Helsinki Inst Phys, FIN-00014 Helsinki, Finland

[21] Head Post Off, Joint Inst Nucl Res, RU-101000 Moscow, Russia

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

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

[24] Univ Min & Met Krakow, Fac Phys & Nucl Tech, PL-30055 Krakow, Poland

[25] Univ Paris 11, Lab Accelerateur Lineaire, IN2P3, CNRS, FR-91405 Orsay, France

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

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

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

[29] Univ Glasgow, Dept Phys & Astron, Glasgow G12, Lanark, Scotland

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

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

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

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

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

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

[36] Univ Milan, Dipartimento Fis, IT-20126 Milan, Italy

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

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

[39] Natl Tech Univ, Phys Dept, GR-15773 Zografos, Greece

[40] Univ Oslo, Dept Phys, NO-0316 Oslo, Norway

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

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

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

[44] INFN, IT-35131 Padua, Italy

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

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

[47] INFN, IT-00173 Rome, Italy

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

[49] INFN, IT-00146 Rome, Italy

[50] CEA Saclay, DAPNIA Serv Phys Particules, F-91191 Gif Sur Yvette, France

来源：

PHYSICS LETTERS B | 2004年 / 585卷 / 1-2期

关键词：

D O I：

10.1016/j.physletb.2004.01.086

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The form factor of A(o)(b) baryons is estimated using 3.46 x 10(6) hadronic Z decays collected by the DELPM experiment between 1992 and 1995. Charmed A(c)(+) baryons fully reconstructed in the pK(-)pi(+), pK(o)(s), and Api(+)pi(+)pi(-) modes, are associated to a c S lepton with opposite charge in order to select A(o)(b) --> A(c)(+)l(-)v(l) decays. From a combined likelihood and event rate fit to the b C distribution of the Isgur-Wise variable w, and using the Heavy Quark Effective Theory (HQET), the slope of the b-baryon form factor is measured to be p(2)=2.03+/-0.46(stat)(-1.00)(+0.72)(syst). The exclusive semileptonic branching fraction Br(A(b)(o) --> A(c)(+)l(-)v(l)) can be derived from p(2) and is found to be (5.0(-0.8)(+1.1)(stat)(-1.2)(+1.6) (syst))%. Limits on other branching fractions are also obtained. (C) 2004 Published by Elsevier B.V.

引用

页码：63 / 84

页数：22

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