Search for a Fourth Generation Charge -1/3 Quark via Flavor Changing Neutral Current Decay

DØ Collaboration

doi:10.1103/PhysRevLett.78.3818

Search for a Fourth Generation Charge -1/3 Quark via Flavor Changing Neutral Current Decay

DØ Collaboration

Physics and Astronomy

Fermi National Accelerator Laboratory
New York University
Michigan State University
Tata Institute of Fundamental Research
Columbia University
Rice University
University of Illinois at Chicago
Lawrence Berkeley National Laboratory
Centro Brasileiro de Pesquisas Físicas
Northeastern University
University of Michigan, Ann Arbor
Iowa State University
Stony Brook University
University of Maryland, College Park
University of Notre Dame
University of Hawai'i at Mānoa
Brown University
University of Rochester
Lomonosov Moscow State University
Panjab University
Northwestern University
Institute for High Energy Physics
University of Delhi
Northern Illinois University
Florida State University
University of California at Davis
University of California at Riverside
Boston University
Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

We report on a search for pair production of a fourth generation charge -1/3 quark (b’) in pp collisions at s = 1.8 TeV by the DØ experiment at the Fermilab Tevatron using an integrated luminosity of 93 pb^-1. Both b’ quarks are assumed to decay via flavor changing neutral currents (FCNC). The search uses the signatures γ + 3 jets + μ-tag and 2γ + 2 jets. We see no significant excess of events over the expected background. We place an upper limit on the production cross section times branching fraction that is well below theoretical expectations for a b’ decaying exclusively via FCNC for b’ masses up to m_z + m_b.

Original language	English
Pages (from-to)	3818-3823
Number of pages	6
Journal	Physical Review Letters
Volume	78
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.78.3818
State	Published - 1997

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10.1103/PhysRevLett.78.3818

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@article{9e74fec811204ea6acef3b96a6cc23e4,

title = "Search for a Fourth Generation Charge -1/3 Quark via Flavor Changing Neutral Current Decay",

abstract = "We report on a search for pair production of a fourth generation charge -1/3 quark (b{\textquoteright}) in pp collisions at s = 1.8 TeV by the D{\O} experiment at the Fermilab Tevatron using an integrated luminosity of 93 pb-1. Both b{\textquoteright} quarks are assumed to decay via flavor changing neutral currents (FCNC). The search uses the signatures γ + 3 jets + μ-tag and 2γ + 2 jets. We see no significant excess of events over the expected background. We place an upper limit on the production cross section times branching fraction that is well below theoretical expectations for a b{\textquoteright} decaying exclusively via FCNC for b{\textquoteright} masses up to mz + mb.",

author = "\{D{\O} Collaboration\} and S. Abachi and B. Abbott and M. Abolins and Acharya, \{B. S.\} and I. Adam and Adams, \{D. L.\} and M. Adams and S. Ahn and H. Aihara and Alves, \{G. A.\} and E. Amidi and N. Amos and Anderson, \{E. W.\} and R. Astur and Baarmand, \{M. M.\} and A. Baden and V. Balamurali and J. Balderston and B. Baldin and S. Banerjee and J. Bantly and Bartlett, \{J. F.\} and K. Bazizi and A. Belyaev and Beri, \{S. B.\} and I. Bertram and Bezzubov, \{V. A.\} and Bhat, \{P. C.\} and V. Bhatnagar and M. Bhattacharjee and N. Biswas and G. Blazey and S. Blessing and P. Bloom and A. Boehnlein and Bojko, \{N. I.\} and F. Borcherding and J. Borders and C. Boswell and Boehnlein, \{A. A.\} and R. Brock and A. Bross and D. Buchholz and Burtovoi, \{V. S.\} and Butler, \{J. M.\} and W. Carvalho and D. Casey and H. Castilla-Valdez and Hobbs, \{J. D.\} and Jung, \{C. K.\}",

year = "1997",

doi = "10.1103/PhysRevLett.78.3818",

language = "English",

volume = "78",

pages = "3818--3823",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "20",

}

TY - JOUR

T1 - Search for a Fourth Generation Charge -1/3 Quark via Flavor Changing Neutral Current Decay

AU - DØ Collaboration

AU - Abachi, S.

AU - Abbott, B.

AU - Abolins, M.

AU - Acharya, B. S.

AU - Adam, I.

AU - Adams, D. L.

AU - Adams, M.

AU - Ahn, S.

AU - Aihara, H.

AU - Alves, G. A.

AU - Amidi, E.

AU - Amos, N.

AU - Anderson, E. W.

AU - Astur, R.

AU - Baarmand, M. M.

AU - Baden, A.

AU - Balamurali, V.

AU - Balderston, J.

AU - Baldin, B.

AU - Banerjee, S.

AU - Bantly, J.

AU - Bartlett, J. F.

AU - Bazizi, K.

AU - Belyaev, A.

AU - Beri, S. B.

AU - Bertram, I.

AU - Bezzubov, V. A.

AU - Bhat, P. C.

AU - Bhatnagar, V.

AU - Bhattacharjee, M.

AU - Biswas, N.

AU - Blazey, G.

AU - Blessing, S.

AU - Bloom, P.

AU - Boehnlein, A.

AU - Bojko, N. I.

AU - Borcherding, F.

AU - Borders, J.

AU - Boswell, C.

AU - Boehnlein, A. A.

AU - Brock, R.

AU - Bross, A.

AU - Buchholz, D.

AU - Burtovoi, V. S.

AU - Butler, J. M.

AU - Carvalho, W.

AU - Casey, D.

AU - Castilla-Valdez, H.

AU - Hobbs, J. D.

AU - Jung, C. K.

PY - 1997

Y1 - 1997

N2 - We report on a search for pair production of a fourth generation charge -1/3 quark (b’) in pp collisions at s = 1.8 TeV by the DØ experiment at the Fermilab Tevatron using an integrated luminosity of 93 pb-1. Both b’ quarks are assumed to decay via flavor changing neutral currents (FCNC). The search uses the signatures γ + 3 jets + μ-tag and 2γ + 2 jets. We see no significant excess of events over the expected background. We place an upper limit on the production cross section times branching fraction that is well below theoretical expectations for a b’ decaying exclusively via FCNC for b’ masses up to mz + mb.

AB - We report on a search for pair production of a fourth generation charge -1/3 quark (b’) in pp collisions at s = 1.8 TeV by the DØ experiment at the Fermilab Tevatron using an integrated luminosity of 93 pb-1. Both b’ quarks are assumed to decay via flavor changing neutral currents (FCNC). The search uses the signatures γ + 3 jets + μ-tag and 2γ + 2 jets. We see no significant excess of events over the expected background. We place an upper limit on the production cross section times branching fraction that is well below theoretical expectations for a b’ decaying exclusively via FCNC for b’ masses up to mz + mb.

UR - https://www.scopus.com/pages/publications/0348055665

U2 - 10.1103/PhysRevLett.78.3818

DO - 10.1103/PhysRevLett.78.3818

M3 - Article

AN - SCOPUS:0348055665

SN - 0031-9007

VL - 78

SP - 3818

EP - 3823

JO - Physical Review Letters

JF - Physical Review Letters

IS - 20

ER -

Search for a Fourth Generation Charge -1/3 Quark via Flavor Changing Neutral Current Decay

Abstract

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