PRECISE MEASUREMENT OF THE LAMBDA-0 AND LAMBDA-OVER-BAR(0) MASSES ANDA TEST OF CPT INVARIANCE

Authors
HARTOUNI EP JENSEN DA KREISLER MN URIBE J CHURCH MD GOTTSCHALK EE KNAPP BC STERN BJ WIENCKE LR CHRISTIAN DC GUTIERREZ G WEHMANN A AVILEZ C FORBUSH M HUSON FR WHITE JT
Citation
Ep. Hartouni et al., PRECISE MEASUREMENT OF THE LAMBDA-0 AND LAMBDA-OVER-BAR(0) MASSES ANDA TEST OF CPT INVARIANCE, Physical review letters, 72(9), 1994, pp. 1322-1325
Citations number
15
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
72
Issue
9
Year of publication
1994
Pages
1322 - 1325
Database
ISI
SICI code
0031-9007(1994)72:9<1322:PMOTLA>2.0.ZU;2-6
Abstract
A precision measurement of the masses of the LAMBDA0 and LAMBDA0BAR hy perons is obtained from Gaussian fits to the invariant mass distributi ons for 20 138 LAMBDA0,s and 18 309 LAMBDA0BAR,s. The Gaussians have s tandard deviations of 0.49 and 0.51 MeV/c2 for the LAMBDA0 and LAMBDA0 BAR, respectively. Systematic errors were reduced by calibrating the s pectrometer with 60000 exclusive events containing a K(S)0 We find M(L AMBDA) = 1115.678 +/- 0.006 +/- 0.006 MeV/c2 and M(LAMBDA)- = 15.690 /- 0.008 +/- 0.006 MeV/c2. The LAMBDA0-LAMBDA0BAR mass difference test ing CPT invariance is -0.012 +/- 0.010 MeV/c2.