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We derive the upper bounds on certain products of R-parity- andlepton-flavor-violating couplings from $B^\pm \to l^\pm \nu$ decays. Thesemodes of B-meson decays can constrain the product combinations of the couplingswith one or more heavy generation indices which are comparable with or strongerthan the present bounds. And we investigate the possible effects of R-parityviolating interactions on $B_c \to l \nu$ decays. These decay modes can belargely affected by R-parity violation.Comment: 8 pages, To appear in Phys. Rev.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Constraints on<i>R</i>-parity violating couplings from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>l</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi>ν</mml:mi></mml:math>decays

Constraints onR-parity violating couplings fromB±→l±νdecays