Comment on “Possibility of Deeply Bound Hadronic Molecules from Single Pion Exchange”

Filin, A. A.; Romanov, Alexander; Baru, V.; Hanhart, C.; Kalashnikova, Yu. S.; Kudryavtsev, A. E.; Meißner, Ulf‐G.; Nefediev, A. V.

doi:10.1103/physrevlett.105.019101

Cited by 46 publications

(36 citation statements)

References 6 publications

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“…Due to the opposite intrinsic parities in the latter case, it is of course impossible that both channels are coupled in S-wave. The most natural possibility (see table 2 While P-wave constituents can benefit from S-wave couplings, they also (on account of those couplings) tend to be rather broad: this can be problematic for the formation of bound states [92,101]. This should not be a problem in the current case: while Λ * c benefits from Swave couplings, it is narrow (Γ = 2.6 ± 0.6 MeV) due to the limited phase space for Λ * c → Σ c π, which follows from eq.…”

Section: Relations Among Decaysmentioning

confidence: 99%

Phenomenology of Pc(4380)+, Pc(4450)+ and related states

2015

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Abstract. The P c(4380)+ and Pc(4450) + states recently discovered at LHCb have masses close to several relevant thresholds, which suggests they can be described in terms of meson-baryon degrees of freedom. This article explores the phenomenology of these states, and their possible partners, from this point of view. Competing models can be distinguished by the masses of the neutral partners which have yet to be observed, and the existence or otherwise of further partners with different isospin, spin, and parity. Future experimental studies in different decay channels can also discriminate among models, using selection rules and algebraic relations among decays. Among the several possible meson-baryon pairs which could be important, one implies that the states are mixtures of isospins 1/2 and 3/2, with characteristic signatures in production and decay. A previous experimental study of a Cabibbo-suppressed decay showed no evidence for the states, and further analysis is required to establish the significance of this non-observation. Several intriguing similarities suggest that P c (4450) + is related to the X(3872) meson.

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Section: Relations Among Decaysmentioning

confidence: 99%

Phenomenology of Pc(4380)+, Pc(4450)+ and related states

2015

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“…* gli@mail.qfnu.edu.cn † liuxiaohai@pku.edu.cn [1] Notice that there are two D 1 states of similar masses, and the one in question should be the narrower one, i.e. the D 1 (2420) (Γ = 27MeV), the D 1 (2430)(Γ ≃ 384 MeV) is too broad to form a molecular state [20][21][22]. …”

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confidence: 99%

Investigating possible decay modes ofY(4260)underD1(2420)D¯<

Liu

2013

Phys. Rev. D

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By assuming that Y (4260) is a D1D molecular state, we investigate some hidden-charm and charmed pair decay channels of Y (4260) via intermediate D1D meson loops with an effective Lagrangian approach. Through investigating the α-dependence of branching ratios and ratios between different decay channels, we show that the intermediate D1D meson loops are crucial for driving these transitions of Y (4260) studied here. The coupled channel effects turn out to be more important in Y (4260) → D * D * , which can be tested in the future experiments.PACS numbers: 13.25.GV, 13.75.Lb, 14.40.Pq I. INTRODUCTIONDuring the past years, the experimental observation of a large number of so-called XY Z states has initiated tremendous efforts to unravel their nature beyond the conventional quark model (for recent reviews, see, e.g. Refs [1][2][3][4][5]). Y (4260) was reported by the BaBar Collaboration in the, which has been confirmed both by the CLEO and Belle collaboration [7,8]. Its mass and total width are well determined as m = 4263 [31], the authors also studied the possibility of Y (4260) as P-wave 1 −− state of charm-strange diquark-antidiquark state in the framework of QCD sum rules and arrived the same conclusion as Ref. [30]. Some lattice calculations give the mass of vector hybrid within this mass region [32], which is very close to the new charmonium-like state Y(4360) [33]. With the D 1D molecular ansatz, a consistent description of some of the experimental observations can be obtained, such as its non observation in open charm decays, or the observation of Z c (3900) as mentioned in Ref. [19], the threshold behavior in its main decay channels are investigated in Ref.[34] and the production of X(3872) is studied in the radiative decays of Y (4260) [22]. Under such a molecular state assumption, a consistent description of many experimental observations could be obtained. However, as studied in [35], the production of an S-wave D 1D pair in e + e − annihilation is forbidden in the limit of exact heavy quark spin symmetry, which substantially weakens the arguments for considering the Y (4260) charmonium-like resonance as a D 1D molecular state.The intermediate meson loop (IML) transition is one of the possible nonperturbative dynamical mechanisms, especially when we investigate the pertinent issues in the energy region of charmonium . During the last decade, many interesting observations were announced by Belle, BaBar, CLEO, BESIII, and so on. And in theoretical study, it is widely recognized that the IML may be closely related to a lot of nonperturbative phenomena observed in experiments , e.g. apparent OZI-rule violations, sizeable non-DD decay branching ratios for ψ(3770) [44][45][46][47][48][49], the HSR violations in charmonium decays [56][57][58], the hidden charmonium decays of the newly discovered Z c [62], etc. * gli@mail.qfnu.edu.cn † liuxiaohai@pku.edu.cn [1] Notice that there are two D 1 states of similar masses, and the one in question should be the narrower one, i.e. the D 1 (2420) (Γ = 27MeV), the D 1 (243...

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“…For example, it is shown in Ref. [31] that the 3-body unitary cuts play very important role in the D αDβ system, if the D β width is dominated by the S-wave D β → D α π decay. In particular, it is demonstrated that if the D β → D α π coupling is sufficiently strong to produce a bound state [32,33], it is, at the same time, necessarily sufficiently strong to provide the state with such a large width that it becomes unobservable.…”

Section: Introductionmentioning

confidence: 99%

Binding energy of theX(3872)at unphysical pion masses

et al. 2015

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Chiral extrapolation of the X(3872) binding energy is investigated using the modified Weinberg formulation of chiral effective field theory for the DD * scattering.Given its explicit renormalisability, this approach is particularly useful to explore the interplay of the long-and short-range DD * forces in the X(3872) from studying the light-quark (pion) mass dependence of its binding energy. In particular, the parameter-free leading-order calculation shows that the X-pole disappears for unphysically large pion masses. On the other hand, without contradicting the naive dimensional analysis, the higher-order pion-mass-dependent contact interaction can change the slope of the binding energy at the physical point yielding the opposite scenario of a stronger bound X at pion masses larger than its physical value. An important role of the pion dynamics and of the 3-body DDπ effects for chiral extrapolations of the X-pole is emphasised. The results of the present study should be of practical value for the lattice simulations since they provide a non-trivial connection between lattice points at unphysical pion masses and the physical world.

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Comment on “Possibility of Deeply Bound Hadronic Molecules from Single Pion Exchange”

Cited by 46 publications

References 6 publications

Phenomenology of Pc(4380)+, Pc(4450)+ and related states

Phenomenology of Pc(4380)+, Pc(4450)+ and related states

Investigating possible decay modes ofY(4260)underD1(2420)D¯<

Binding energy of theX(3872)at unphysical pion masses

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