Majorana Neutrinos and Same-Sign Dilepton Production at LHC and in Rare Meson Decays

Details Majorana Neutrinos and Same-Sign Dilepton Production at LHC and in Rare Meson Decays Majorana Neutrinos and Same-Sign Dilepton Production at LHC and in Rare Meson Decays

2001-04-12

arxiv.org/abs/hep-ph/0104123v3

Eur.Phys.J.C21:123-132,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 4 figures (requires graphicx), a coefficient in Eq. (4) corrected leading to drastic reduction in the Majorana-induc

Scientific paper

10.1007/s100520100702

We discuss same-sign dilepton production mediated by Majorana neutrinos in high-energy proton-proton collisions $pp\ra \ell^+ \ell^{\prime +}X$ for $\ell,~ \ell^\prime = e,~ \mu,~ \tau$ at the LHC energy $\sqrt{s}=14$ TeV, and in the rare decays of $K$, $D$, $D_s$, and $B$ mesons of the type $M^{+}\ra M^{\prime -}\ell ^{+}\ell ^{\prime+}$. For the $pp$ reaction, assuming one heavy Majorana neutrino of mass $m_N$, we present discovery limits in the $(m_{N},|U_{\ell N}U_{\ell^\prime N}|)$ plane where $U_{\ell N}$ are the mixing parameters. Taking into account the present limits from low energy experiments, we show that at LHC for the nominal luminosity L=100 fb$^{-1}$ there is no room for observable same-sign dilepton signals. However, increasing the integrated luminosity by a factor 30, one will have sensitivity to heavy Majorana neutrinos up to a mass $m_N\leq 1.5$ TeV only in the dilepton channels $\mu\mu$ and $\mu \tau$, but other dilepton states will not be detectable due to the already existing strong constraints. We work out a large number of rare meson decays, both for the light and heavy Majorana neutrino scenarios, and argue that the present experimental bounds on the branching ratios are too weak to set reasonable limits on the effective Majorana masses.

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