Search for Stopped Gluinos from p
p Collisions at p
s

1:96 TeV

GUSTAVO OTERO Y GARZON, THE DZERO COLLABORATION

PHYSICAL REVIEW LETTERS

Año: 2007 p. 1318011 - 1318018

0031-9007

Long-lived, heavy particles are predicted in a number of models beyond the standard model of particlephysics. We present the first direct search for such particles’ decays, occurring up to 100 h after their production and not synchronized with an accelerator bunch crossing. We apply the analysis to the gluino(~g), predicted in split supersymmetry, which after hadronization can become charged and lose enoughmomentum through ionization to come to rest in dense particle detectors. Approximately 410 pb1 of pp
collisions at


ps
1:96 TeV collected with the D0 detector during Run II of the Fermilab Tevatroncollider are analyzed in search of such ‘‘stopped gluinos’’ decaying into a gluon and a neutralino (~
01).Limits are placed on the gluino cross section  probability to stop  BR~g ! g~
01 as a function ofthe gluino and ~
01masses, for gluino lifetimes from 30 s–100 h