Double parton scattering in (p)over-bar-p collisions at root s=1.8 TeV

被引：270

作者：

Abe, F

Akimoto, H

Akopian, A

Albrow, MG

Amendolia, SR

Amidei, D

Antos, J

Aota, S

Apollinari, G

Asakawa, T

Ashmanskas, W

Atac, M

Azfar, F

AzziBacchetta, P

Bacchetta, N

Badgett, W

Bagdasarov, S

Bailey, MW

Bao, J

deBarbaro, P

BarbaroGaltieri, A

Barnes, VE

Barnett, BA

Barone, M

Barzi, E

Bauer, G

Baumann, T

Bedeschi, F

Behrends, S

Belforte, S

Bellettini, G

Bellinger, J

Benjamin, D

Benlloch, J

Bensinger, J

Benton, D

Beretvas, A

Berge, JP

Berryhill, J

Bertolucci, S

Bevensee, B

Bhatti, A

Biery, K

Binkley, M

Bisello, D

Blair, RE

Blocker, C

Bodek, A

Bokhari, W

Bolognesi, V

机构：

[1] ARGONNE NATL LAB, ARGONNE, IL 60439 USA

[2] UNIV BOLOGNA, IST NAZL FIS NUCL, I-40127 BOLOGNA, ITALY

[3] BRANDEIS UNIV, WALTHAM, MA 02264 USA

[4] UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA

[5] UNIV CHICAGO, CHICAGO, IL 60638 USA

[6] DUKE UNIV, DURHAM, NC 28708 USA

[7] FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA

[8] UNIV FLORIDA, GAINESVILLE, FL 33611 USA

[9] IST NAZL FIS NUCL, LAB NAZL FRASCATI, I-00044 FRASCATI, ITALY

[10] UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND

[11] HARVARD UNIV, CAMBRIDGE, MA 02138 USA

[12] HIROSHIMA UNIV, HIGASHIHIROSHIMA 724, JAPAN

[13] UNIV ILLINOIS, URBANA, IL 61801 USA

[14] MCGILL UNIV, INST PARTICLE PHYS, MONTREAL, PQ H3A 2T8, CANADA

[15] UNIV TORONTO, TORONTO, ON M5S 1A7, CANADA

[16] JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA

[17] UNIV KARLSRUHE, D-76128 KARLSRUHE, GERMANY

[18] UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA

[19] MIT, CAMBRIDGE, MA 02139 USA

[20] UNIV MICHIGAN, ANN ARBOR, MI 48109 USA

[21] MICHIGAN STATE UNIV, E LANSING, MI 48824 USA

[22] UNIV NEW MEXICO, ALBUQUERQUE, NM 87132 USA

[23] OHIO STATE UNIV, COLUMBUS, OH 43320 USA

[24] OSAKA CITY UNIV, OSAKA 588, JAPAN

[25] UNIV PADUA, IST NAZL FIS NUCL, SEZ PADOVA, I-36132 PADUA, ITALY

[26] UNIV PENN, PHILADELPHIA, PA 19104 USA

[27] UNIV PISA, IST NAZL FIS NUCL, I-56100 PISA, ITALY

[28] SCUOLA NORMALE SUPER PISA, I-56100 PISA, ITALY

[29] UNIV PITTSBURGH, PITTSBURGH, PA 15270 USA

[30] PURDUE UNIV, W LAFAYETTE, IN 47907 USA

[31] ROCKEFELLER UNIV, NEW YORK, NY 10021 USA

[32] RUTGERS STATE UNIV, PISCATAWAY, NJ 08854 USA

[33] ACAD SINICA, TAIPEI 11530, TAIWAN

[34] TEXAS A&M UNIV, COLLEGE STN, TX 77843 USA

[35] TEXAS TECH UNIV, LUBBOCK, TX 79409 USA

[36] UNIV TSUKUBA, TSUKUBA, IBARAKI 315, JAPAN

[37] TUFTS UNIV, MEDFORD, MA 02155 USA

[38] UNIV WISCONSIN, MADISON, WI 53806 USA

[39] YALE UNIV, NEW HAVEN, CT 06511 USA

来源：

PHYSICAL REVIEW D | 1997年 / 56卷 / 07期

关键词：

D O I：

10.1103/PhysRevD.56.3811

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A strong signal for double parton (DP) scattering is observed in a 16 pb(-1) sample of <(p)over bar p> --> gamma/pi(0) + 3 jets + X data from the CDF experiment at the Fermilab Tevatron. In DP events, two separate hard scatterings take place in a single <(p)over bar p> collision. We isolate a large sample of data (similar to 14 000 events) of which 53% are found to be DP. The process-independent parameter of double parton scattering, sigma(eff), is obtained without reference to theoretical calculations by comparing observed DP events to events with hard scatterings in separate <(p)over bar p> collisions. The result sigma(eff) = (14.5 +/- 1.7(-2.3)(+1.7)) mb represents a significant improvement over previous measurements, and is used to constrain simple models of parton spatial density. The Feynman x dependence of sigma(eff) is investigated and none is apparent. Further, no evidence is found for kinematic correlations between the two scatterings in DP events.

引用

页码：3811 / 3832

页数：22

共 25 条

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