Study of the Standard Model and Majorana neutrino contributions to <inline-formula><span class="inline-formula-span">${ B}^{{ +}} { \to} { K}^{{ (*){ \pm}}}{ \mu}^{ +}{ \mu}^{{ \mp}}$</span><img text_id='' class='formula-img' style='display:none;' src='CPC-2018-0358_M1.png' data-text='${ B}^{{ +}} { \to} { K}^{{ (*){ \pm}}}{ \mu}^{ +}{ \mu}^{{ \mp}}$'/><alternatives></alternatives></inline-formula>

Figure 1. Feynman diagrams for the opposite-sign dilepton B meson rare decays ${B^{+}\to K^{(*)+}\ell^{+}\ell^{-}}$. The solid circle stands for the effective vertex of the leading-order ${b\to s\ell^+\ell^-}$transition and N denotes the Majorana neutrino.

Figure 2. Feynman diagrams for ${B^{+}\to K^{(*)-}\ell^{+}\ell^{+}}$ via Majorana neutrino exchange.

Figure 3. (a) The invariant mass distributions and (b) the angular distributions of the opposite-sign dilepton for ${{B}(B^{+}\to K^{(*)+}\mu^{+}\mu^{-})}$in the SM.

Figure 4. Simplified branching ratios ${\bar{{B}}(B^{+}\to K^{(*)-} \mu^{+} \mu^{+}) = }$${{B} (B^{+} \to K^{(*)-} \mu^{+} \mu^{+}) / |V_{\mu N}|^2}$with respect to Majorana neutrino mass m _N.

Figure 5. Contour plot obtained from the experimental upper limits for LNV rare decays ${B^{+}\to K^{-}\mu^{+}\mu^{+}}$ and ${B^{+}\to \pi^{-}\mu^{+}\mu^{+}}$.

Figure 6. (a) The invariant mass distributions and (b) the angular distributions of the same-sign dilepton for ${\bar{\cal{B}}(B^{+}\to K^{(*)-} \mu^{+} \mu^{+})}$ with m_N=2 GeV.