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The mSUGRA parameter space corresponding to light sleptons well within thereach of LHC and relatively light squarks and gluinos (mass $\le$ 1 TeV) hasthree regions consistent with the WMAP data on dark matter relic density anddirect mass bounds from LEP 2. Each region can lead to distinct leptonicsignatures from squark-gluino events during the early LHC experiments(integrated luminosity $\sim 10 ~fb^{-1}$ or even smaller). In the much studiedstau-LSP coannihilation region with a vanishing common trilinear coupling($A_0$) at the GUT scale a large fraction of the final states contain electronsand / or muons and $e$ - $\mu$ - $\tau$ universality holds to a goodapproximation. In the not so well studied scenarios with non-vanishing $A_0$both LSP pair annihilation and stau-LSP coannihilation could contributesignificantly to the dark matter relic density for even smaller squark-gluinomasses. Our simulations indicate that the corresponding signatures are finalstates rich in $\tau$-leptons while final states with electrons and muons aresuppressed leading to a violation of lepton universality. These features may beobserved to a lesser extent even in the modified parameter space (with non-zero$A_0$) where the coannihilation process dominates. We also show that thegeneric $m$-leptons + $n$-jets+ $\not! E_T$ signatures without flavour taggingcan also discriminate among the three scenarios. However, the signals becomemore informative if the $\tau$ and $b$-jet tagging facilities at the LHCexperiments are utilized.

Lepton Flavours at the Early LHC Experiments as the Footprints of the Dark Matter Producing Mechanisms