MEASUREMENT OF THE PARTIAL WIDTH OF THE DECAY OF THE Z0 INTO CHARM QUARK PAIRS

被引：17

作者：

Abreu, P

Adam, W

Adami, F

Adye, T

Alekseev, GD

Allen, P

Almehed, S

Alted, F

Alvsvaag, SJ

Amaldi, U

Anassontzis, E

Apel, WD

Asman, B

Astier, P

Augustin, JE

Augustinus, A

Baillon, P

Bambade, P

Barao, F

Barbiellini, G

Bardin, DY

Baroncelli, A

Barring, O

Bartl, W

Bates, MJ

Baubillier, M

Becks, KH

Beeston, CJ

Beilliere, P

Belokopytov, I

Beltran, P

Benedic, D

Benlloch, JM

Berggren, M

Bertrand, D

Biagi, S

Bianchi, F

Bibby, JH

Bilenky, MS

Billoir, P

Bjarne, J

Bloch, D

Bogolubov, PN

Bollini, D

Bolognese, T

Bonapart, M

Bonesini, M

Booth, PSL

Boratay, M

Borgeaud, P

机构：

[1] LIP, P-1000 Lisbon, PORTUGAL

[2] Osterreich Akad Wissensch, Inst Hochenergiephys, A-1050 Vienna, AUSTRIA

[3] CEN Saclay, DPhPE, F-91191 Gif Sur Yvette, FRANCE

[4] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, ENGLAND

[5] Joint Inst Nucl, SU-101000 Moscow, RUSSIA

[6] Ctr Mixto Univ Valencia CSIC, Inst Fis Corpuscular IFIC, E-46100 Burjassot, Valencia, SPAIN

[7] Univ Lund, Dept Phys, S-22363 Lund, SWEDEN

[8] Univ Bergen, Dept Phys, N-5007 Bergen, NORWAY

[9] CERN, CH-1211 Geneva 23, SWITZERLAND

[10] Univ Athens, Phys Lab, GR-10680 Athens, GREECE

[11] Univ Karlsruhe, Inst Expt Kernphys, D-7500 Karlsruhe 1, GERMANY

[12] Univ Stockholm, Inst Phys, S-11346 Stockholm, SWEDEN

[13] Univ Paris 06, LPNHE, F-75230 Paris 05, FRANCE

[14] Univ Paris 07, F-75230 Paris 05, FRANCE

[15] Univ Paris Sud, Lab Accelerateur, F-91405 Orsay, FRANCE

[16] Univ Trieste, Dipartimento Fis, I-34127 Trieste, ITALY

[17] Ist Nazl Fis Nucl, I-34127 Trieste, ITALY

[18] Univ Udine, Inst Pis, I-33100 Udine, ITALY

[19] Ist Nazl Fis Nucl, Ist Super Sanita, I-00161 Rome, ITALY

[20] Univ Rome 2, Dipartimento Fis, I-00173 Rome, ITALY

[21] Ist Nazl Fis Nucl, I-00173 Rome, ITALY

[22] Univ Oxford, Nucl Phys Lab, Oxford OX1 3RH, ENGLAND

[23] Univ Wuppertal, Fachnbereich Phys, D-5600 Wuppertal 1, GERMANY

[24] Coll France, Lab Phys Corpusculaire, F-75231 Paris 05, FRANCE

[25] Inst High Energy Phys, SU-142284 Protvino, Moscow Region, RUSSIA

[26] Nucl Res Ctr Demokritos, Greek Atom Energy Commiss, GR-15310 Aghia Paraskevi, GREECE

[27] CRN Grp DELPHI, Div Hautes Energies, F-67037 Strasbourg, FRANCE

[28] LEPSI, F-67037 Strasbourg, FRANCE

[29] Univ Instelling Antwerpen, Phys Dept, B-2610 Wilrijk, BELGIUM

[30] ULB VUB, IIHE, B-1050 Brussels, BELGIUM

[31] Univ Etat Mons, Fac Sci, Serv Phys Particules Elementaires, B-7000 Mons, BELGIUM

[32] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, ENGLAND

[33] Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, ITALY

[34] Ist Nazl Fis Nucl, I-10125 Turin, ITALY

[35] Univ Bologna, Dipartimento Fis, I-40126 Bologna, ITALY

[36] Ist Nazl Fis Nucl, I-40126 Bologna, ITALY

[37] NIKHEF H, NL-1009 DB Amsterdam, NETHERLANDS

[38] Univ Milan, Dipartimento Fis, I-20133 Milan, ITALY

[39] Ist Nazl Fis Nucl, I-20133 Milan, ITALY

[40] Univ Uppsala, Dept Radiat Sci, S-75121 Uppsala, SWEDEN

[41] Univ Genoa, Dipartimento Fis, I-16146 Genoa, ITALY

[42] Ist Nazl Fis Nucl, I-16146 Genoa, ITALY

[43] Univ Helsinki, Dept High Energy Phys, SF-00170 Helsinki 17, FINLAND

[44] Univ Oslo, Phys Dept, N-1000 Oslo 3, NORWAY

[45] Univ Santander, Fac Ciencias, E-39005 Santander, SPAIN

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

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

[48] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[49] Iowa State Univ, Dept Phys, Ames, IA 50011 USA

[50] Niels Bohr Inst, DK-2100 Copenhagen O, DENMARK

来源：

PHYSICS LETTERS B | 1990年 / 252卷 / 01期

关键词：

D O I：

10.1016/0370-2693(90)91096-T

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A determination of the partial width gamma-cc-BAR of the Z0 boson into charm quark pairs is presented, based on a total sample of 36 900 Z0 hadronic decays measured with the DELPHI detector at the LEP collider. The production rate of ccBAR events is derived from the inclusive analysis of charged pions coming from the decay of charmed meson D*+ --> D0-pi+ and D*- --> DBAR0-pi- where the pi- +/- is constrained by kinematics to have a low p(T) with respect to the jet axis. The probability to procedure these pi- +/- from D* +/- decay in ccBAR events is taken to be 0.31 +/- 0.05 as measured at square-root s = 10.55 GeV. The measured relative partial width GAMMA-ccBAR/GAMMA-h = 0.162 +/- 0.030 (stat.) +/- 0.050(syst.) is in good agreement with the standard model value of 0.171. Together with our previous measurement of the total hadronic width GAMMA-h this implies GAMMA-ccBAR = 282 +/- 53(stat.) +/- 88(syst.) MeV.

引用

页码：140 / 148

页数：9

共 21 条

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