2020
DOI: 10.1016/j.physletb.2020.135250
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Exploring S-wave threshold effects in QCD: A heavy-light approach

Abstract: QCD exhibits complex dynamics near S-wave two-body thresholds. For light mesons, we see this in the failure of quark models to explain the f0(500) and K * 0 (700) masses. For charmonium, an unexpected X(3872) state appears at the open charm threshold. In heavy-light systems, analogous threshold effects appear for the lowest J P = 0 + and 1 + states in the Ds and Bs systems. Here we describe how lattice QCD can be used to understand these threshold dynamics by smoothly varying the strange-quark mass when studyi… Show more

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Cited by 4 publications
(7 citation statements)
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“…This amplitude contains an S-wave bound state pole at a t √ s 0 = 0.40170(11)(15) with a coupling a t c Dπ = 0.134(9)(29). 8 This is broadly in agreement with ref. [26], with a slightly larger pole coupling.…”
Section: Light Quark Mass Dependencesupporting
confidence: 93%
See 1 more Smart Citation
“…This amplitude contains an S-wave bound state pole at a t √ s 0 = 0.40170(11)(15) with a coupling a t c Dπ = 0.134(9)(29). 8 This is broadly in agreement with ref. [26], with a slightly larger pole coupling.…”
Section: Light Quark Mass Dependencesupporting
confidence: 93%
“…In contrast to the D * 0 , the D * s0 is reported some 200 MeV below typical quark potential model predictions [7], perhaps even below the D * 0 . The vastly differing widths, and how these affect the masses, call for a deeper theoretical analysis of these states and the light quark mass dependence in the open charm sector [8].…”
Section: Introductionmentioning
confidence: 99%
“…It is useful to ask [22] what perturbations can be performed to the D s0 (2317) system in order to understand exotics more quantitatively, and the X(3872) specifically? With lattice QCD, we can explore how exotics change (both their mass, pole type, and residue) as we vary the quark mass -a task that experiment cannot perform.…”
Section: The Bound D S0 (2317) Statementioning
confidence: 99%
“…In this way, we can supplement experimental data with lattice QCD. Specifically, [22] advocates examining the D s0 → D K process as a function of strange quark mass m s , and using leading order heavy-quark effective field theory to describe heavy-light systems, and leading order chiral perturbation theory for light-light pseudoscalar mesons. If we take m s → m s − , then M D reduces by − , while M 2 K changes by −B , with B the leading order χ-PT constant.…”
Section: The Bound D S0 (2317) Statementioning
confidence: 99%
“…It is useful to ask [21] what perturbations can be performed to the 0 (2317) system in order to understand exotics more quantitatively, and the (3872) specifically? With lattice QCD, we can explore how exotics change (both their mass, pole type, and residue) as we vary the quark mass -a task that experiment cannot perform.…”
Section: The Bound 0 (2317) Statementioning
confidence: 99%