Improved measurement of the probability for gluon splitting into b(b)over-bar in Z0 decays

被引：11

作者：

Abe, K ^{[1
]}

Abe, T

Adam, I

Akimoto, H

Aston, D

Baird, KG

Baltay, C

Band, HR

Barklow, TL

Bauer, JM

Bellodi, G

Berger, R

Blaylock, G

Bogart, JR

Bower, GR

Brau, JE

Breidenbach, M

Bugg, WM

Burke, D

Burnett, TH

Burrows, PN

Calcaterra, A

Cassell, R

Chou, A

Cohn, HO

Coller, JA

Convery, MR

Cook, V

Cowan, RF

Crawford, G

Damerell, CJS

Daoudi, M

de Groot, N

de Sangro, R

Dong, DN

Doser, M

Dubois, R

Erofeeva, I

Eschenburg, V

Etzion, E

Fahey, S

Falciai, D

Fernandez, JP

Flood, K

Frey, R

Hart, EL

Hasuko, K

Hertzbach, SS

Huffer, ME

机构：

[1] Tohoku Univ, Sendai, Miyagi 980, Japan

[2] Nagoya Univ, Chikusa Ku, Nagoya, Aichi 464, Japan

[3] Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA

[4] Univ Massachusetts, Amherst, MA 01003 USA

[5] Univ Wisconsin, Madison, WI 53706 USA

[6] Univ Mississippi, University, MS 38677 USA

[7] Univ Oxford, Oxford OX1 3RH, England

[8] Univ Oregon, Eugene, OR 97403 USA

[9] Univ Tennessee, Knoxville, TN 37996 USA

[10] Univ Washington, Seattle, WA 98105 USA

[11] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[12] Boston Univ, Boston, MA 02215 USA

[13] MIT, Cambridge, MA 02139 USA

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

[15] Univ Bristol, Bristol, Avon, England

[16] Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow 119899, Russia

[17] Univ Colorado, Boulder, CO 80309 USA

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

[19] Rutgers State Univ, Piscataway, NJ 08855 USA

[20] Univ Perugia, I-06100 Perugia, Italy

[21] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy

[22] Brunel Univ, Uxbridge UB8 3PH, Middx, England

[23] Vanderbilt Univ, Nashville, TN 37235 USA

[24] Soongsil Univ, Seoul 156743, South Korea

[25] Univ Ferrara, I-44100 Ferrara, Italy

[26] Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy

[27] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[28] Colorado State Univ, Ft Collins, CO 80523 USA

[29] Johns Hopkins Univ, Baltimore, MD 21218 USA

[30] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA

[31] Aomori Univ, Aomori 030, Japan

来源：

PHYSICS LETTERS B | 2001年 / 507卷 / 1-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(01)00367-7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have measured gluon splitting into bottom quarks, g --> b (b) over bar, in hadronic Z(0) decays collected by SLD between 1996 and 1998. The analysis was performed by looking for secondary bottom production in 4-jet events of any primary flavor. 4-jet events were identified. and in each event a topological vertex-mass technique was applied to the two jets closest in angle in order to identify them as b or b;jets. The upgraded CCD-based vertex detector gives very high B-tagging efficiency, especially for B hadrons with the low energies typical of this process. We measured the rate of g --> b (b) over bar production per hadronic event, g(b (b) over bar), to be (2.44 +/- 0.59(stat.) +/- 0.34(syst.)) x 10(-3). (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：61 / 69

页数：9

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