Direct photon cross section with conversions at CDF -: art. no. 074008

被引：21

作者：

Acosta, D ^{[1
]}

Affolder, T

Albrow, MG

Ambrose, D

Amidei, D

Anikeev, K

Antos, J

Apollinari, G

Arisawa, T

Artikov, A

Ashmanskas, W

Azfar, F

Azzi-Bacchetta, P

Bacchetta, N

Bachacou, H

Badgett, W

Barbaro-Galtieri, A

Barnes, VE

Barnett, BA

Baroiant, S

Barone, M

Bauer, G

Bedeschi, F

Behari, S

Belforte, S

Bell, WH

Bellettini, G

Bellinger, J

Benjamin, D

Beretvas, A

Bhatti, A

Binkley, M

Bisello, D

Bishai, M

Blair, RE

Blocker, C

Bloom, K

Blumenfeld, B

Bocci, A

Bodek, A

Bolla, G

Bolshov, A

Bortoletto, D

Boudreau, J

Bromberg, C

Brubaker, E

Budagov, J

Budd, HS

Burkett, K

Busetto, G

机构：

[1] Univ Florida, Gainesville, FL 32611 USA

[2] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

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

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

[5] Brandeis Univ, Waltham, MA 02254 USA

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

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

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

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

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

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

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

[13] Duke Univ, Durham, NC 27708 USA

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

[15] Univ Florida, Gainesville, FL 32611 USA

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

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

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

[19] Harvard Univ, Cambridge, MA 02138 USA

[20] Hiroshima Univ, Higashihiroshima 724, Japan

[21] Univ Illinois, Urbana, IL 61801 USA

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

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

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

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

[26] Sungkyunkwan Univ, Suwon 440746, South Korea

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

[28] UCL, London WC1E 6BT, England

[29] MIT, Cambridge, MA 02139 USA

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

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

[32] Inst Theoret & Expt Phys, Moscow 117259, Russia

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

[34] Northwestern Univ, Evanston, IL 60208 USA

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

[36] Osaka City Univ, Osaka 588, Japan

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

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

[39] Univ Penn, Philadelphia, PA 19104 USA

[40] Univ & Scuola Normale Super Pisa, Ist Nazl Fis Nucl, I-56100 Pisa, Italy

[41] Univ Pittsburgh, Pittsburgh, PA 15260 USA

[42] Purdue Univ, W Lafayette, IN 47907 USA

[43] Univ Rochester, Rochester, NY 14627 USA

[44] Rockefeller Univ, New York, NY 10021 USA

[45] Univ Rome 1 La Sapienza, Inst Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

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

[47] Texas A&M Univ, College Stn, TX 77843 USA

[48] Texas Tech Univ, Lubbock, TX 79409 USA

[49] Univ Toronto, Inst Particle Phys, Toronto, ON M5S 1A7, Canada

[50] Univ Trieste, Ist Nazl Fis Nucl, Udine, Italy

来源：

PHYSICAL REVIEW D | 2004年 / 70卷 / 07期

基金：

加拿大自然科学与工程研究理事会; 新加坡国家研究基金会; 俄罗斯基础研究基金会; 美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.70.074008

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a measurement of the isolated direct photon cross section in p (p) over bar collisions at roots=1.8 TeV and \eta\<0.9 using data collected between 1994 and 1995 by the Collider Detector at Fermilab (CDF). The measurement is based on events where the photon converts into an electron-positron pair in the material of the inner detector, resulting in a two track event signature. To remove pi(0)-->gammagamma and eta-->gammagamma events from the data we use a new background subtraction technique which takes advantage of the tracking information available in a photon conversion event. We find that the shape of the cross section as a function of photon p(T) is poorly described by next-to-leading-order QCD predictions, but agrees with previous CDF measurements.

引用

页数：12

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