Measurement of b hadron production fractions in 7 TeV pp collisions

By R. Aaij, C. Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, Federico Alessio, M. Alexander and 579 more. 2011

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Measurements of $b$ hadron production ratios in proton-proton collisions at a centre-of-mass energy of 7 TeV with an integrated luminosity of 3 pb$^{-1}$ are presented. We study the ratios of strange $B$ meson to light $B$ meson production $f_s/(f_u+f_d)$ and $Lambda_b^0$ baryon to light $B$ meson production $f_{Lambda_b}/(f_u+f_d)$ as a function of the charmed hadron-muon pair transverse momentum $p_T$ and the $b$ hadron pseudorapidity $eta$, for $p_T$ between 0 and 14 GeV and $eta$ between 2 and 5. We find that $f_s/(f_u+f_d)$ is consistent with being independent of $p_{rm T}$ and $eta$, and we determine $f_s/(f_u+f_d)$ = 0.134$pm$ 0.004 $^{+0.011}_{-0.010}$, where the first error is statistical and the second systematic. The corresponding ratio $f_{Lambda_b}/(f_u+f_d)$ is found to be dependent upon the transverse momentum of the charmed hadron-muon pair, $f_{Lambda_b}/(f_u+f_d)=(0.404pm 0.017 (stat) pm 0.027 (syst) pm 0.105 (Br))times[1 -(0.031 pm 0.004 (stat) pm 0.003 (syst))times p_T(GeV)]$, where Br reflects an absolute scale uncertainty due to the poorly known branching fraction Br(Lambda_c^+ to pK^-pi^+)$. We extract the ratio of strange $B$ meson to light neutral $B$ meson production $f_s/f_d$ by averaging the result reported here with two previous measurements derived from the relative abundances of $bar{B}_s to D_S^+ pi ^-$ to $bar{B}^0 to D^+K^-$ and $bar{B}^0 to D^+pi^-$. We obtain $f_s/f_d=0.267^{+0.021}_{-0.020}$.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/dffcfbbf6abbdbd2764da25ceb5b5d9cc54aaeec

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In Nuclear and High Energy Physics

Citations in the corpus

Heavy Neutral Leptons at FASER (2018, methodology): “We then employ the LHCb results for fi [98, 99] that correspond to the continuum bb̄ production mode”
Measurement of the fragmentation fraction ratio fs/fd and its dependence on B meson kinematics (2013, methodology): “The ratio of fragmentation fractions can depend on the centre-of-mass energy, as well as on the kinematics of the B (s) meson, as was studied previously at LHCb with partially reconstructed B decays [4].”
Exotics: Heavy pentaquarks and tetraquarks (2017, background): “In the acceptance of the LHCb experiment ∼20% of all b-flavored hadrons are Λb ’s [110].”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, unknown): “Abundant samples of Λb’s will be produced only at (HL-)LHC, with a production cross-section σ(Λb)/σ(bb̄) ∼ 10% [779].”
Λ c + production in pp collisions at √s=7 TeV and in p-Pb collisions at √sNN=5.02 TeV (2017, background): “A study of the Λ 0b baryon to B − and B 0 meson production by LHCb [10] reported a transverse momentum ( p T ) dependence of that ratio, interpreted as evidence of non-universality of fragmentation fractions in the beauty sector [11,12].”
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