R. Barate et al., SEARCH FOR PAIR-PRODUCTION OF LONG-LIVED HEAVY CHARGED-PARTICLES IN E(-)-ANNIHILATION()E(), Physics letters. Section B, 405(3-4), 1997, pp. 379-388
A search for pair-production of long-lived, heavy, singly-charged part
icles has been performed with data collected by the ALEPH detector at
a centre-of-mass energy of 172 GeV. Data at root s = 161, 136, and 130
GeV are also included to improve the sensitivity to lower masses. No
candidate is found in the data. A model-independent 95% confidence lev
el upper limit on the production cross section at 172 GeV of 0.2-0.4 p
b is derived for masses between 45 and 86 GeV/c(2). This cross section
limit implies, assuming the MSSM, a lower limit of 67 (69) GeV/c(2) o
n the mass of right- (left-) handed long-lived scalar taus or scalar m
uons and of 86 GeV/c(2) on the mass of long-lived charginos. (C) 1997
Elsevier Science B.V.