Abstract
The first search for the doubly heavy baryon and a search for the baryon are performed using collision data collected via the experiment from 2016 to 2018 at a centre-of-mass energy of , corresponding to an integrated luminosity of 5.2 . The baryons are reconstructed via their decays to and . No significant excess is found for invariant masses between 6700 and 7300 , in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20 . Upper limits are set on the ratio of the and production cross-section times the branching fraction to ( ) relative to that of the ( ) baryon, for different lifetime hypotheses, at 95% confidence level. The upper limits range from to for the ( ) decay, and from to for the ( ) decay, depending on the considered mass and lifetime of the ( ) baryon.
Highlights
The constituent quark model was initially proposed by Murray Gell-Mann [1] and George Zweig [2] for classification of hadrons formed from light quarks (u, d, s) and understanding their quantum numbers
To improve the resolution of the mass of the Hb0c candidates, the Λ+c π− (Ξc+π−) invariant mass is calculated after constraining the Λ+c (Ξc+) mass to its known value [49] and requiring the Hb0c candidate to be consistent with originating from its associated pp collision vertex (PV)
Upper limits are set at 95% confidence level on the ratios R(Λ+c π−) and R(Ξc+π−) under different mass and lifetime hypotheses for the Ωb0c and Ξb0c baryons, using the asymptotic CLs method implemented in the RooStats framework [63, 64] considering the systematic uncertainties
Summary
The constituent quark model was initially proposed by Murray Gell-Mann [1] and George Zweig [2] for classification of hadrons formed from light quarks (u, d, s) and understanding their quantum numbers. The production c√ross-section of the Ξb0c baryon in proton-proton (pp) collisions at a centre-of-mass energy s = 14 TeV is expected to lie in the range between 19 to 39 nb, derived from Ref. The LHCb experiment found no significant Ξb0c baryon signal in the predicted mass range using the Ξb0c → D0pK− decay mode [29]. The production cross-section times branching fraction of Hb0c → Λ+c π− (Hb0c → Ξc+π−) decay is measured relative to that of the control channel Λ0b → Λ+c π− (Ξb0 → Ξc+π−). This takes advantage of identical final-state particles and similar topology. The Hb0c baryons are reconstructed in the fiducial region of rapidity (y) between 2.0 and 4.5 and with pT between 2 and 20 GeV/c
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