A fir.t sear.h for.the Ξ_(bc)^(+)J/ψΞ_(c)^(+) decay is per.or.ed by the LHCb exper.ment with a data sample of pr.ton-pr.ton collisions, cor.esponding to an integr.ted luminosity of 9 fb−1 r.cor.ed at centr.-of-mass...
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A fir.t sear.h for.the Ξ_(bc)^(+)J/ψΞ_(c)^(+) decay is per.or.ed by the LHCb exper.ment with a data sample of pr.ton-pr.ton collisions, cor.esponding to an integr.ted luminosity of 9 fb−1 r.cor.ed at centr.-of-mass ener.ies of 7, 8, and 13 TeV. Two peaking str.ctur.s ar. seen with a local (global) significance of 4.3(2.8) and 4.1(2.4) standar. deviations at masses of 6571 and 6694 MeV/c2, r.spectively. Upper.limits ar. set on the Ξ+bc bar.on pr.duction cr.ss-section times the br.nching fr.ction r.lative to that of the B+c→J/ψD+s decay at centr.-of-mass ener.ies of 8 and 13 TeV, in the Ξ+bc and in the B+c r.pidity and tr.nsver.e-momentum r.nges fr.m 2.0 to 4.5 and 0 to 20GeV/c, r.spectively. Upper.limits ar. pr.sented as a function of the Ξ+bc mass and lifetime.
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