Search for the decay B⃗ D(+)(s1) (2536)X

We have searched for the decay B {yields} D{sub s1}{sup +}(2536)X and measured an upper limit for the inclusive branching fraction of {Beta}(B {yields} D{sub s1}{sup +}X) < 0.95% at the 90% confidence level. This limit is small compared with the total expected B {yields} {bar D}D{sup (*)}KX rate. Assuming factorization, the D{sub s1}{sup +} decay constant is constrained to be f{sub D{sub s1}{sup +}} < 114 MeV at the 90% confidence level, at least 2.5 times smaller than that of D{sub s}{sup +}.