Strong evidence for ZZ production in pp collisions at √s=1.96 TeV

被引：31

作者：

Aaltonen, T. ^{[24
]}

Adelman, J. ^{[13
]}

Akimoto, T. ^{[61
]}

Albrow, M. G. ^{[18
]}

Gonzalez, B. Alvarez ^{[11
]}

Amerio, S. ^{[48
]}

Amidei, D. ^{[40
]}

Anastassov, A. ^{[1
,58
]}

Annovi, A. ^{[20
]}

Antos, J. ^{[14
,15
]}

Aoki, M. ^{[25
]}

Apollinari, G. ^{[18
]}

Apresyan, A. ^{[54
]}

Arisawa, T. ^{[63
]}

Artikov, A. ^{[16
]}

Ashmanskas, W. ^{[18
]}

Attal, A. ^{[3
]}

Aurisano, A. ^{[59
]}

Azfar, F. ^{[47
]}

Azzi-Bacchetta, P. ^{[48
]}

Azzurri, P. ^{[51
,52
]}

Bacchetta, N. ^{[48
]}

Badgett, W. ^{[18
]}

Barbaro-Galtieri, A. ^{[33
]}

Barnes, V. E. ^{[54
]}

Barnett, B. A.

Baroiant, S.

Bartsch, V. ^{[35
]}

Bauer, G. ^{[37
]}

Beauchemin, P. -H. ^{[38
,39
]}

Bedeschi, F. ^{[51
,52
]}

Bednar, P. ^{[14
,15
]}

Behari, S. ^{[26
]}

Bellettini, G. ^{[51
,52
]}

Bellinger, J. ^{[65
]}

Belloni, A. ^{[23
]}

Benjamin, D. ^{[17
]}

Beretvas, A. ^{[18
]}

Beringer, J. ^{[33
]}

Berry, T. ^{[34
]}

Bhatti, A. ^{[56
]}

Binkley, M. ^{[18
]}

Bisello, D. ^{[48
]}

Bizjak, I. ^{[35
]}

Blair, R. E. ^{[2
]}

Blocker, C. ^{[6
]}

Blumenfeld, B. ^{[26
]}

Bocci, A. ^{[17
]}

Bodek, A. ^{[55
]}

Boisvert, V. ^{[55
]}

机构：

[1] Univ Helsinki, Dept Phys, Div High Energy Phys, FIN-00014 Helsinki, Finland

[2] Argonne Natl Lab, Argonne, IL 60439 USA

[3] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain

[4] Baylor Univ, Waco, TX 76798 USA

[5] Univ Bologna, Ist Nazl Fis Nucl, I-40127 Bologna, Italy

[6] Brandeis Univ, Waltham, MA 02254 USA

[7] Univ Calif Davis, Davis, CA 95616 USA

[8] Univ Calif Los Angeles, Los Angeles, CA 90024 USA

[9] Univ Calif San Diego, La Jolla, CA 92093 USA

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

[11] Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain

[12] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[13] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[14] Comenius Univ, Bratislava 84248, Slovakia

[15] Inst Expt Phys, Kosice 04001, Slovakia

[16] Joint Inst Nucl Res, RU-141980 Dubna, Russia

[17] Duke Univ, Durham, NC 27708 USA

[18] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[19] Univ Florida, Gainesville, FL 32611 USA

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

[21] Univ Geneva, CH-1211 Geneva 4, Switzerland

[22] Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland

[23] Harvard Univ, Cambridge, MA 02138 USA

[24] Helsinki Inst Phys, FIN-00014 Helsinki, Finland

[25] Univ Illinois, Urbana, IL 61801 USA

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

[27] Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany

[28] Kyungpook Natl Univ, Ctr High Energy Phys, Taegu 702701, South Korea

[29] Seoul Natl Univ, Seoul 151742, South Korea

[30] Sungkyunkwan Univ, Suwon 440746, South Korea

[31] Korea Inst Sci & Technol Informat, Taejon 305806, South Korea

[32] Chonnam Natl Univ, Kwangju 500757, South Korea

[33] Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[34] Univ Liverpool, Liverpool L69 7ZE, Merseyside, England

[35] UCL, London WC1E 6BT, England

[36] Ctr Invest Energet Medioambientales & Tecnol, E-28040 Madrid, Spain

[37] MIT, Cambridge, MA 02139 USA

[38] McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada

[39] Univ Toronto, Toronto, ON M5S 1A7, Canada

[40] Univ Michigan, Ann Arbor, MI 48109 USA

[41] Michigan State Univ, E Lansing, MI 48824 USA

[42] Univ New Mexico, Albuquerque, NM 87131 USA

[43] Northwestern Univ, Evanston, IL 60208 USA

[44] Ohio State Univ, Columbus, OH 43210 USA

[45] Okayama Univ, Okayama 7008530, Japan

[46] Osaka City Univ, Osaka 588, Japan

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

[48] Univ Padua, Ist Nazl Fis Nucl, Sez Padova Trento, I-35131 Padua, Italy

[49] Univ Paris 06, IN2P3 CNRS, UMR7585, LPNHE, F-75252 Paris, France

[50] Univ Penn, Philadelphia, PA 19104 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 20期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1103/PhysRevLett.100.201801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first evidence of Z boson pair production at a hadron collider with a significance exceeding 4 standard deviations. This result is based on a data sample corresponding to 1.9 fb(-1) of integrated luminosity from pp collisions at root s=1.96 TeV collected with the Collider Detector at Fermilab II detector. In the lll'l' channel, we observe three ZZ candidates with an expected background of 0.096(-0.063)(+0.092) events. In the ll nu nu channel, we use a leading-order calculation of the relative ZZ and WW event probabilities to discriminate between signal and background. In the combination of lll'l' and ll nu nu channels, we observe an excess of events with a probability of 5.1 x 10(-6) to be due to the expected background. This corresponds to a significance of 4.4 standard deviations. The measured cross section is sigma(pp -> ZZ)=1.4(-0.6)(+0.7)(stat+syst) pb, consistent with the standard model expectation.

引用

页数：7

共 20 条

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