7 research outputs found
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Identification of charm jets at LHCb
The identification of charm jets is achieved at LHCb for data collected in
2015-2018 using a method based on the properties of displaced vertices
reconstructed and matched with jets. The performance of this method is
determined using a dijet calibration dataset recorded by the LHCb detector and
selected such that the jets are unbiased in quantities used in the tagging
algorithm. The charm-tagging efficiency is reported as a function of the
transverse momentum of the jet. The measured efficiencies are compared to those
obtained from simulation and found to be in good agreement
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Study of Bc+ decays to charmonia and three light hadrons
Using proton-proton collision data, corresponding to an integrated luminosity
of collected with the LHCb detector, seven decay modes of the
meson into a or meson and three charged hadrons,
kaons or pions, are studied. The decays , , and
are observed for the first time, and evidence for
the decay is found, where and
mesons are reconstructed in their dimuon decay modes. The ratios of
branching fractions between the different decays are reported as well
as the fractions of the decays proceeding via intermediate resonances. The
results largely support the factorisation approach used for a theoretical
description of the studied decays
Recommended from our members
Study of Bc+ decays to charmonia and three light hadrons
Using proton-proton collision data, corresponding to an integrated luminosity
of collected with the LHCb detector, seven decay modes of the
meson into a or meson and three charged hadrons,
kaons or pions, are studied. The decays , , and
are observed for the first time, and evidence for
the decay is found, where and
mesons are reconstructed in their dimuon decay modes. The ratios of
branching fractions between the different decays are reported as well
as the fractions of the decays proceeding via intermediate resonances. The
results largely support the factorisation approach used for a theoretical
description of the studied decays
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Constraints on the CKM angle γ from B <sup> ±</sup> → Dh <sup> ±</sup> decays using D → h <sup> ±</sup> h′<sup>∓</sup> π <sup>0</sup> final states
Abstract
A data sample collected with the LHCb detector corresponding to an integrated luminosity of 9 fb−1 is used to measure eleven CP violation observables in B±→ Dh± decays, where h is either a kaon or a pion. The neutral D meson decay is reconstructed in the three-body final states: K±π∓π0; π+π−π0; K+K−π0 and the suppressed π±K∓π0 combination. The mode where a large CP asymmetry is expected, B±→ [π±K∓π0]DK±, is observed with a significance greater than seven standard deviations. The ratio of the partial width of this mode relative to that of the favoured mode, B±→ [K±π∓π0]DK±, is RADS(K) = (1.27 ± 0.16 ± 0.02) × 10−2. Evidence for a large CP asymmetry is also seen: AADS(K) = −0.38 ± 0.12 ± 0.02. Constraints on the CKM angle γ are calculated from the eleven reported observables.</jats:p
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Measurement of χ<inf>c1</inf>(3872) production in proton-proton collisions at √s = 8 and 13 TeV
The production cross-section of the state relative to the
meson is measured using proton-proton collision data collected with
the LHCb experiment at centre-of-mass energies of and 13 TeV,
corresponding to integrated luminosities of 2.0 and 5.4 fb,
respectively. The two mesons are reconstructed in the
final state. The ratios of the prompt and nonprompt to
production cross-sections are measured as a function of transverse
momentum, , and rapidity, , in the kinematic range GeV/ and . The prompt ratio is found to increase with
independently of . The double-differential cross-section ratio
of relative to mesons between 13 and 8 TeV is also
measured for the prompt component and observed to be consistent with unity,
independent of and centre-of-mass energy
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Measurement of chi(c1) (3872) production in proton-proton collisions at root s=8 and 13 TeV
Abstract
The production cross-section of the χc1(3872) state relative to the ψ(2S) meson is measured using proton-proton collision data collected with the LHCb experiment at centre-of-mass energies of
s
= 8 and 13 TeV, corresponding to integrated luminosities of 2.0 and 5.4 fb−1, respectively. The two mesons are reconstructed in the J/ψπ+π− final state. The ratios of the prompt and nonprompt χc1(3872) to ψ(2S) production cross-sections are measured as a function of transverse momentum, pT, and rapidity, y, of the χc1(3872) and ψ(2S) states, in the kinematic range 4 < pT< 20 GeV/c and 2.0 < y < 4.5. The prompt ratio is found to increase with pT, independently of y. For the prompt component, the double ratio of the χc1(3872) and ψ(2S) production cross-sections between 13 and 8 TeV is observed to be consistent with unity, independent of pT and centre-of-mass energy.</jats:p