Measurement of Rb using a vertex mass tag

被引：57

作者：

Abe, K ^{[1
]}

Akagi, T

Allen, NJ

Ash, WW

Aston, D

Baird, KG

Baltay, C

Band, HR

Barakat, MB

Baranko, G

Bardon, O

Barklow, TL

Bashindzhagyan, GL

Bazarko, AO

Ben-David, R

Benvenuti, AC

Bilei, GM

Bisello, D

Blaylock, G

Bogart, JR

Bolen, B

Bolton, T

Bower, GR

Brau, JE

Breidenbach, M

Bugg, WM

Burke, D

Burnett, TH

Burrows, PN

Busza, W

Calcaterra, A

Caldwell, DO

Calloway, D

Camanzi, B

Carpinelli, M

Cassell, R

Castaldi, R

Castro, A

Cavalli-Sforza, M

Chou, A

Church, E

Cohn, HO

Coller, JA

Cook, V

Cotton, R

Cowan, RF

Coyne, DG

Crawford, G

D'Oliveira, A

机构：

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

[2] Adelphi Univ, Garden City, NY 11530 USA

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

[4] Boston Univ, Boston, MA 02215 USA

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

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

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

[8] Univ Cincinnati, Cincinnati, OH 45221 USA

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

[10] Univ Colorado, Boulder, CO 80309 USA

[11] Columbia Univ, New York, NY 10027 USA

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

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

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

[15] Univ Illinois, Urbana, IL 61801 USA

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

[17] MIT, Cambridge, MA 02139 USA

[18] Univ Massachusetts, Amherst, MA 01003 USA

[19] Univ Mississippi, University, MS 38677 USA

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

[21] Univ Oregon, Eugene, OR 97403 USA

[22] Ist Nazl Fis Nucl, I-35100 Padua, Italy

[23] Univ Padua, I-35100 Padua, Italy

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

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

[26] Ist Nazl Fis Nucl, I-56100 Pisa, Italy

[27] Univ Pisa, I-56100 Pisa, Italy

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

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

[30] Sogang Univ, Seoul, South Korea

[31] Soongsil Univ, Seoul 156743, South Korea

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

[33] Univ Tennessee, Knoxville, TN 37996 USA

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

[35] Vanderbilt Univ, Nashville, TN 37325 USA

[36] Univ Washington, Seattle, WA 98195 USA

[37] Univ Wisconsin, Madison, WI 53706 USA

[38] Yale Univ, New Haven, CT 06511 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.80.660

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a new measurement of R(b) = Gamma(Z0-->b (b) over bar)/Gamma(Z0-->hadrons) using a double tag technique, where the b hemisphere selection is based on the reconstructed mass of the B hadron decay vertex. The measurement was performed using a sample of 130 x 10(3) hadronic Z(0) events, collected with the SLD detector at SLC. The method utilizes the 3D vertexing abilities of the CCD pixel vertex detector and the small stable SLC beams to obtain a high b-tagging efficiency and purity. We obtain R(b) = 0.2142 +/- 0.0034(stat) +/- 0.0015(syst) +/- 0.0002(R(c)). [S0031-9007(97)05018-7].

引用

页码：660 / 665

页数：6

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