Abstract
The LHCb experiment is designed to study the properties and decays of heavy flavored hadrons produced in pp collisions at the LHC. The data collected enables precision spectroscopy studies of beauty and charm hadrons. The latest results on spectroscopy of conventional and exotic hadrons are reviewed.
Highlights
The LHCb experiment is designed to study the properties and decays of heavy flavored hadrons produced in pp collisions at the LHC
In the simple quark model, only two types of quark combinations are required to account for the existing hadrons, i.e. qqcombinations form mesons, while baryons are made up of three quarks
In the quark model proposed by Gell-Mann and Zweig in 1960s [1] other SU(3) color-neutral combinations of quarks and gluons such as gg glueballs, qqg hybrids, qqqqtetraquarks, qqqqq pentaquarks etc. are allowed
Summary
In the simple quark model, only two types of quark combinations are required to account for the existing hadrons, i.e. qqcombinations form mesons, while baryons are made up of three quarks. With a full amplitude analysis, the masses of these two states are measured to be 4380 ± 8(stat) ± 29(syst) MeV and 4449.8 ± 1.7(stat) ± 2.5(syst) MeV, with the widths. The preferred spin-parity values are (3/2−, 5/2+), (3/2+, 5/2−) and (5/2+, 3/2−), where the first one is the JP assignment given by the best fit This analysis has been extended with a model-independent approach [6] which gave consistent results. The Zc(4430)− state was first reported by the Belle collaboration [8] as a charged resonance structure in the ψ π− invariant mass distribution in the decay B0 → ψ K+π−. There has been a great deal of experimental and theoretical interest in J/ψφ mass structures in B+ → J/ψφK+ decays since the CDF collaboration presented 3.8σ evidence for a near-threshold X(4140) mass peak, with width Γ = 11.7 MeV [11]. It can be noted that the X(4140) width is substantially larger than previously
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