SEARCH FOR LONG-LIVED PARTICLES IN 200 GEV-C PROTON-NUCLEON COLLISIONS

被引：9

作者：

BOZZOLI, W

BUSSIERE, A

GIACOMELLI, G

LESQUOY, E

MEUNIER, R

MOSCOSO, L

MULLER, A

PLANE, DE

RIMONDI, F

ZYLBERAJCH, S

机构：

[1] IST NAZL FIZ NUCL,BOLOGNA,ITALY

[2] LAPP,ANNECY,FRANCE

[3] CENS,F-91190 GIF SUR YVETTE,FRANCE

[4] CERN,CH-1211 GENEVA 23,SWITZERLAND

来源：

NUCLEAR PHYSICS B | 1979年 / 159卷 / 03期

关键词：

D O I：

10.1016/0550-3213(79)90340-7

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A search for long-lived particles (τ ≳ 10-8 sec), with changes ± 2 3, ± 1, ± 4 3 and ± 2, produced in 200 GeV pN collisions was performed at the CERN-SPS in a secondary beam equipped with superconducting r.f. separators. Upper limits were obtained for the production of long-lived hadrons and leptons. For charge - 1 particles the limits are at the level of 10-7 of the pions at a mass m = 0.2 GeV and reach the 10-11 level from 3 to 8 GeV. The production of light antinuclei was measured. The cross sections for 3He production are (1.3 ± 0.3) and (1.9 ± 0.3) × 10-34 cm2/sr · GeV/c at 21 and 47.4 GeV/c respectively; for t the cross section is (7.6 ± 0.9) × 10-34 cm2/sr · GeV/c at 23.7 GeV/c. © 1979.

引用

页码：363 / 382

页数：20

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