Yubing Dong, Amand Faessler, Thomas Gutsche, Valery E. Lyubovitskij
The two newly observed hidden-charm mesons Zc(+)[3900] and a possible partner state Zc'(+)[3950] with quantum numbers J(P) = 1(+) are considered as hadronic molecules composed of bar(D)D* and bar(D)* D*, respectively. We give predictions for the decay widths of the strong two-body transitions Zc(+) -> H + pi(+) and Zc' -> H + pi(+) with H = Psi(nS), hc(mP) in a phenomenological Lagrangian approach.
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We consider decays of the hidden charm LHCb pentaquarks in the hadrocharmonium and molecular scenarios. In both pictures the LHCb pentaquarks are essentially nonrelativistic bound states. We develop a semirelativistic framework for calculation of the partial decay widths that allows the final particles to be relativistic. Using this approach we calculate the decay widths in the hadrocharmonium and molecular pictures. Molecular hidden charm pentaquarks are constructed as loosely bound states of charmed and anticharmed hadrons. Calculations show that molecular pentaquarks decay predominantly int…
We apply a phenomenological Lagrangian approach to the radiative decay Y(4260) -> X(3872) + gamma. The Y(4260) and X(3872) resonances are considered as composite states containing both molecular hadronic and charmonium components. Having a leading molecular component in the X(3872) and a sole molecular configuration for the Y(4260) results in a prediction compatible with present data.
In this talk, we firstly overview the experimental status of $\bar{N}_X(1625)$, which is an enhancement structure observed in $K^{-}\barΛ$ invariant mass spectrum of $J/ψ\to pK^{-}\barΛ$ process. Then we present the result of the decay of $\bar{N}_X(1625)$ under the two molecular assumptions, i.e. S-wave $\barΛK^-$ and S-wave $\barΣ^0K^-$ molecular states. Several experimental suggestions for $\bar{N}_X(1625)$ are proposed.
The radiative decays $ϕ\toγa_0/f_0$ in the molecular model for the scalar mesons
研究了$ϕ$介子到标量介子$a_0(980)$和$f_0(980)$的辐射衰变.我们证明，与以前的要求相反，这些衰变应该是相同的数量级的分子状态和紧凑的状态，因此，现有的实验信息是一致的，一个分子以及紧凑的结构的标量。因此，$ϕ$介子的辐射衰变为标量建立了标量介子的相当大的$K\bar K$分量，但不允许区分分子和紧凑状态。
We study the semileptonic $B_s$ and $B$ decays into the $D_{s 0}^{\ast} (2317)$ and $D_{0}^{\ast} (2400)$ resonances, respectively. With the help of a chiral unitarity model in coupled channels we compute the ratio of the decay widths of both processes. Using current values of the width for the $\bar{B}^{0} \to D_{0}^{\ast} (2400)^{+} \barν_{l} l^{-}$ decay we make predictions for the rate of the $\bar{B}_{s}^{0} \to D_{s0}^{\ast} (2317)^{+} \barν_{l} l^{-}$ decay.
Interference and binding effects in decays of possible molecular component of X(3872)
指出通过测量X（3872）\to D^0 {\bar D}^0 π^0和X（3872）\to D^0 {\bar D}^0 γ的衰变率和谱，可以较详细地研究X（3872）在D^0 {\bar D}^{*0}阈值处的窄共振的内部结构.特别是，如果这个共振包含一个占主导地位的“分子”成分D { \bar D^*} \pm { \bar D} D^*，那么这个成分就可以通过D^{*0}和{ \bar D}^{*0}之间的一种独特的干涉模式来揭示和研究，而X（3872）的固定（但未知）C宇称确保了它们的相干性。
Very recently, a new $Ω^{*}$ state was reported by the Belle Collaboration, with its mass of $2012.4 \pm 0.7\ \text{(stat)}\pm 0.6\ \text{(syst)}\ \mathrm{MeV}$, which locates just below the $KΞ^*$ threshold and hence hints to be a possible $KΞ^*$ hadronic molecule. Using the effective Lagrangian approach as the same as our previous works for other possible hadronic molecular states, we investigate the decay behavior of this new $Ω^*$ state within the hadronic molecular picture. The results show that the measured decay width can be reproduced well and its dominant decay channel is predicted to…
We study the $\bar{K} Ξ$ decay mode of the newly observed $Ω(2012)$ assuming that the $Ω(2012)$ is a dynamically generated state with spin-parity $J^P = 3/2^-$ from the coupled channel $S$-wave interactions of $\bar{K}Ξ(1530)$ and $ηΩ$. In addition we also calculate its $KπΞ$ three-body decay mode. It is shown that the so-obtained total decay width is in fair agreement with the experimental data. We compare our results with those of other recent studies and highlight differences among them.
In the present work, we investigate the productions of the molecular states composed of $D^{(*)}_s \bar{D}^{(*)}$ and $D^{(*)}_s \bar{D}^{(*)}_s$ in the $B$ and $B_s$ decays by using an effective Lagrangian approach. The branching ratios in terms of the model parameter $α$ and the binding energy $ΔE$ are estimated. Our estimations indicate that the branching fractions are of the order of $10^{-4}$ and the relative ratios are very weakly dependent on the model parameter $α$ and the binding energy $ΔE$. The predicted ratios are helpful for searching the hidden-charm molecular states with strange…
In the present work, the partial decay widths of $P_{c}(4312)$ to $η_{c} p$ and $J/ψp$ are investigated with the QCD sum rule method under the assumption that $P_{c}(4312)$ is a $\bar{D}Σ_{c}$ molecular state with $J^{P}=\frac{1}{2}^{-}$. In the analysis, the pole residue of $P_{c}(4312)$, one of the input parameters for the calculations of the strong decay constants, is calculated first. With the numerical values of the strong decay constants, the partial decay widths to $η_{c} p$ and $J/ψp$ are estimated to be $Γ(P_{c}(4312)\rightarrow η_{c} p)=5.54^{+0.75}_{-0.5}\mbox{MeV}$ and $Γ(P_{c}(431…
The Y(4260) as an omega chi_{c1} molecular state
这表明，新观察到的Y（4260）的BARBAR合作是一个分子状态组成的omega和chi_{c1}。讨论了它们的产生和衰变性质。这种分子状态Y（4260）的结果是，它以与pi+ pi-J/psi相似的速率衰变为pi+ pi-pi 0 chi_{c1}。还预期以Y（4260）->pi+ pi- J/psi的一半速率产生Y（4260）->pi 0 pi 0 J/psi。这些衰变模式应该在B工厂中使用初始状态辐射返回数据和B衰变数据来搜索。
Two-body strong decays of the hidden-charm tetraquark molecular states via the QCD sum rules
本文利用QCD求和规则研究$D^*\ar{D}^*$隐粲四夸克分子态的两体强衰变，计算了不同量子数基态的衰变宽度，并支持将$X_2(4014)$解释为$J^{PC}=2^{++}$的$D^*\ar{D}^*$分子态。
In this article, we tentatively assign the $P_c(4312)$ to be the $\bar{D}Σ_c$ pentaquark molecular state with the spin-parity $J^P={\frac{1}{2}}^-$, and discuss the factorizable and non-factorizable contributions in the two-point QCD sum rules for the $\bar{D}Σ_c$ molecular state in details to prove the reliability of the single pole approximation in the hadronic spectral density. We study its two-body strong decays with the QCD sum rules, special attentions are paid to match the hadron side with the QCD side of the correlation functions to obtain solid duality. We obtain the partial decay wid…
We study the $B_c^- \to π^- J/ψω$ and $B_c^- \to π^- D^* \bar{D}^*$ reactions and show that they are related by the presence of two resonances, the $X(3940)$ and $X(3930)$, that are of molecular nature and couple most strongly to $D^* \bar{D}^*$, but also to $J/ψω$. Because of that, in the $J/ψω$ mass distribution we find a cusp with large strength at the $D^* \bar{D}^*$ threshold and predict the ratio of strengths between the peak of the cusp and the maximum of the $D^* \bar{D}^*$ distribution close to $D^* \bar{D}^*$ threshold, which are distinct features of the molecular nature of these two…
We evaluate the partial decay widths for the semileptonic $Λ_b \to \bar ν_l l Λ_c(2595)$ and $Λ_b \to \bar ν_l l Λ_c(2625)$ decays from the perspective that these two $Λ^*_c$ resonances are dynamically generated from the $DN$ and $D^*N$ interaction with coupled channels. We find that the ratio of the rates obtained for these two reactions is compatible with present experimental data and is very sensitive to the $D^* N$ coupling, which becomes essential to obtain agreement with experiment. Together with the results obtained for the $Λ_b \to π^- Λ^*_c$ reactions, it gives strong support to the m…
Scalar $D^{(*)}K^{(*)}$ and $D^{(*)}π(ρ)$ molecular states from B meson decays
利用SU(3)味对称性和末态相互作用，研究B介子衰变产生标量单粲四夸克态，发现VV或PP分子态分支比可达10^{-4}，CP不对称性达10^{-3}，并指出T_{c̄s0}^*(2870)^0更可能是D̄*0K*0分子态。
Prediction of the masses and decay processes of strange, charmed and bottomed pentaquarks from the linear molecular crypto-heptaquark model
本文预言了几种新的奇异、粲化和底奇异五夸克态的质量和衰变过程。在一个标准的夸克模型中对多夸克进行了微观研究。在纯基态五夸克态中，计算了短程相互作用，结果表明短程相互作用是排斥的。预计远程和中程相互作用不会产生足够的吸引力。一个额外的夸克-反夸克对，然后考虑，这是建议产生一个狭窄的线性分子系统。夸克聚集在三个强子团中，中心强子提供稳定性。可能的隐七夸克强子与异国情调的五夸克味，与任何数量的奇怪的，迷人的和底夸克，列出。一些新的外来物种仍可能被观察到。
From a picture of the X(3872) where the resonance is a bound state of $\bar{D}D^*-c.c.$, we evaluate the decay width into the $J/ψγ$ channel, which is sensitive to the internal structure of this state. For this purpose we evaluate the loops through which the X(3872) decays into its components, and the $J/ψ$ and the photon are radiated from these components. We use the local hidden gauge approach extrapolated to SU(4) with a particular SU(4) breaking. The radiative decay involves anomalous couplings and we obtain acceptable values which are compared to experiments and results of other calculati…
Investigating the M1 radiative decay behaviors and the magnetic moments of the predicted triple-charm molecular-type pentaquarks
基于组分夸克模型并考虑S-D波混合与耦合道效应，系统研究了三粲分子型五夸克态候选者的M1辐射衰变宽度与磁矩，揭示了其内部结构，为LHCb实验探测提供理论参考。
The X(3872) has non-charmonium-like properties, such as decay processes that seem to violate isospin, and a mass that lies unexpectedly close to the neutral-D-plus-neutral-D-excited-state threshold. An EFT that includes both charmonium-like (short distance) and molecule-like (meson bound state) properties is used to analyze the X(3872) as it is produced in the decay of ψ(4160). This is a route that BESIII may be able to measure. We find that the correlation between the angular distribution of the outcoming photon (or X(3872)) and the polarization of the ψ(4160) source may be used to provide in…
Exploring two-body strong decay properties for possible single charm molecular pentaquarks with strangeness $|S|=1,2$
本文通过有效拉格朗日方法和单玻色交换模型计算了单底分子五夸克在Y_cK*(*)系统中的双体强衰变宽度和分支比，揭示了分子识别的特征衰变模式。
Using the general form of the generalized Bethe-Salpeter wave functions for four-quark states describing the meson-meson molecular structure given in our previous work, we obtain the general formulas for the decay widths of molecular states composed of two vector mesons with arbitrary spin and parity into two photons. Then this general formalism is applied to investigate the radiative two-photon decay of the obeserved \emph{X}(3915) state, where this exotic state \emph{X}(3915) is considered as a molecular state consisting of two heavy vector mesons $D^{*0}\bar{D}^{*0}$. The numerical result o…
From the perspective that the $Λ_c(2595)$ and $Λ_c(2625)$ are dynamically generated resonances from the $DN,~D^*N$ interaction and coupled channels, we have evaluated the rates for $Λ_b \to π^- Λ_c(2595)$ and $Λ_b \to π^- Λ_c(2625)$ up to a global unknown factor that allows us to calculate the ratio of rates and compare with experiment, where good agreement is found. Similarly, we can also make predictions for the ratio of rates of the, yet unknown, decays of $Λ_b \to D_s^- Λ_c(2595)$ and $Λ_b \to D_s^- Λ_c(2625)$ and make estimates for their individual branching fractions.
Study of X(1812) as a $(K^*\bar K^*)$ Molecular State
我们研究了最近在北京谱仪Ⅱ的$\jp\toγX(1812), X(1812)\toωϕ$中观测到的X（1812）共振的衰变和产生机制。在X（1812）作为$(\ksks)$候选分子的情况下，计算了$X(1812)\toηη'$、$ ηη$、$ ωϕ$、$ K^+K^-$、$ ρ^+ρ^-$、$ ωω$、$ K^{*+}K^{*-}$和$π^+π^-$的衰变宽度.结果表明，夸克交换机制在理解$X(1812)\toωϕ$的大衰变宽度中起着重要的作用。研究还发现，夸克交换机制增强了$X(1812)\toηη'$和$ηη$的衰变宽度.这些通道被认为是在实验中检验分子情景的工具。评价$Br(X\toωϕ)$的支化分数约为4.60%。本文综述了$\jp$辐射衰变中X（1812）的新证据。在分子情景中，X（1812）产生速率也被评估为$Γ(\jp\toγX)/Γ(\jp\toγK^{*+}K^{*-})=2.13^{+7.41}_{-1.85}$，其接近于测量值$2.83\pm0.92$。
Molecular structure of the Bs0*(5725) and Bs1(5778) bottom-strange mesons
本文讨论了标量Bs 0 ~*（5725）和轴向Bs 1 ~*（5778）底奇异介子分别作为B K和B ~* K介子的强子分子束缚态的可能解释。用唯象拉格朗日方法分析了强Bs 0 * 到Bs pi 0，Bs 1到Bs* pi 0和辐射Bs 0 * 到Bs* γ，Bs 1到Bs γ，Bs 1到Bs* γ，Bs 1到Bs 0 * γ衰变.我们预测的衰变特性：有效耦合和衰变宽度。
Hidden charmed decays of $X(3872)$ within the $D{\bar D}^*$ molecular framework
本文在 $D\bar{D}^*$ 分子态框架下用有效拉格朗日方法计算 $X(3872)\toπ^+π^-η_c$，发现箱圈贡献比三角圈大一个数量级，宽度可达几十 keV。
Unveiling the Composition of the Single-Charm Molecular Pentaquarks: Insights from Radiative Decay and Magnetic Moment
本研究通过系统分析单粲分子五夸克态的辐射衰变和磁矩，利用组分夸克模型揭示其内部结构，为区分自旋-宇称和构型提供关键线索，并有助于理解Λc+(2940)和Λc+(2910)的性质。
Radiative decays and magnetic moments of the predicted $B_c$-like molecules
本研究采用考虑S-D波混合效应的组分夸克模型，系统研究类$B_c$分子态的跃迁磁矩、辐射衰变行为及磁矩，发现相关电磁性质可用于表征其内部结构并区分常规$B_c$介子态，为实验探索提供理论参考。
Investigating the $P$-wave $DK^{*}$ Molecular Interpretation of the $D_{s1}(2700)$ via Its Strong Decays
本研究通过有效拉格朗日方法计算D_{s1}(2700)的强衰变宽度，结合实验约束验证其作为P波DK*分子态的解释，预测的衰变宽度与实验吻合，且D_s*η道的结果与传统夸克模型预言有显著差异。
Exploring the molecular scenario of X(4160)
本文在分子态框架下用有效拉格朗日量和三角圈图机制计算X(4160)的多个衰变道宽度，发现D*D̄*模式分支比最大，为检验其粲偶素归属提供预言。
The $D_{s1}(2460) \to D_s π^+ π^- $ decay from a $D_{s1}$ molecular perspective
本研究从分子态视角研究$D_{s1}(2460)$衰变，通过三角形图机制计算粒子对质量分布，与LHCb实验数据吻合，支持分子图像，并讨论了标量介子的作用。
In this work, we study the radiative and strong decay of $S$-wave $K\bar{K}_1(1400)$ molecular state within the effective Lagrangians approach and find the relation between the $K\bar{K}_1(1400)$ molecular state and the newly observed $η_1(1855)$ state by comparing with the BESIII observation. The prediction indicates that the decay width can reach up to $182.97^{+2.79}_{-3.50}$ MeV, which can be confronted with the experimental data. If the $η_1(1855)$ could be $S$-wave $K\bar{K}_1(1400)$ molecular state, the $K\bar{K}^{*}π$ three-body decay provides the dominant contribution, not the $ηη^{'}…
Hadronic decays of possible pseudoscalar $P$-wave $D\bar{D}^\ast/\bar{D}D^\ast$ molecular state
本研究计算了预言中的赝标量P波D̄D*/D̄D*分子态G0(3900)的强子衰变宽度，发现隐粲道ωJ/ψ和π+π-ηc(1S)为主，建议BESIII和Belle II在这些过程中搜索该态。
D* K molecular structure of the Ds1(2460) meson
讨论了Ds 1（2460）介子作为强子分子的一种可能解释--D* 和K介子的束缚态。使用唯象的拉格朗日方法，我们确定强Ds 1到Ds* pi 0和辐射Ds 1到Ds伽马衰变。在数量级上，我们的部分强和辐射衰变宽度的结果与以前的计算是一致的。
Radiative decays of X(3872) discriminate between the molecular and compact interpretations
本文通过计算X(3872)辐射衰变到ψ′γ与ψγ的分支比R，证明紧致四夸克态给出R≈1而DD*分子态仅约10^-2，可借实验判别其本质。
Molecular Interpretation of the X(3872)
X（3872）在3πJ/π J模式下的发现是其分子性质的有力证据。一个成功的预测这种衰变模式和其他预测在这里进行审查。
New type of doubly charmed molecular pentaquarks containing most strange quarks: Mass spectra, radiative decays, and magnetic moments
基于单玻色子交换模型预测了包含最多奇异夸克的新型双粲分子五夸克态的质量谱，并计算了最有希望候选者的辐射衰变与磁矩，为LHCb实验寻找提供理论线索。
We study the strong decays of the newly observed $Ξ_b(6227)$ assuming that it is a pure $Σ_b\bar{K}$ molecular state. Considering four possible spin-parity assingments $J^P=1/2^{\pm}$ and $3/2^{\pm}$, the partial decay widths of the $Σ_b\bar{K}$ molecular state into $Λ_b\bar{K}$, $Ξ_bπ$, and $Ξ_b^{'}π$ final states through hadronic loops are evaluated with the help of the effective Lagrangians. In comparison with the LHCb data, the spin-party $1/2^-$ assignment is preferred while those of $J^P=1/2^{+}$ and $J^P=3/2^{\pm}$ are disfavored. In addition, we show that the two allowed decay modes $Λ…
Recently, several exotic bosons have been confirmed as multi-quark states, but there are violent disputes about their inner structures, namely if they are molecular states or tetraquarks, or even mixtures of the two structures. It would be interesting to experimentally search for non-strange four-quark states with open charm or bottom which are lighter than $Λ_c$ or $Λ_b$. Reasonable arguments indicate that they are good candidates of pure molecular states $Dπ$ or $Bπ$ because pions are the lightest boson. Both $Bπ$ and $Dπ$ bound states do not decay via strong interaction. The $Bπ$ molecule m…
We present a mechanism for $Ω_c \to π^+ Ω(2012)$ production through an external emission Cabibbo favored weak decay mode, where the $Ω(2012)$ is dynamically generated from the interaction of $\bar{K}Ξ^*(1530)$, $ηΩ$, with $\bar{K}Ξ$ as the main decay channel. The $Ω(2012)$ decays later to $\bar{K}Ξ$ in this picture, with results compatible with Belle data. The picture has as a consequence that one can evaluate the direct decay $Ω_c^0 \to π^+K^- Ξ^0$ and the decay $Ω_c^0 \to π^+\bar{K} Ξ^*$, $π^+ηΩ$ with direct coupling of $\bar{K}Ξ^*$ and $ηΩ$ to $K^- Ξ^0$. We show that, within uncertainties a…
Based on previous studies that support the vector-vector molecular structure of the $f_2(1270)$, $f'_2(1525)$, $\bar{K}^{*\,0}_2(1430)$, $f_0(1370)$ and $f_0(1710)$ resonances, we make predictions for $ψ(2S)$ decay into $ω(ϕ) f_2(1270)$, $ω(ϕ) f'_2(1525)$, $K^{*0}(892) \bar{K}^{*\,0}_2(1430)$ and radiative decay of $Υ(1S),Υ(2S), ψ(2S)$ into $γf_2(1270)$, $γf'_2(1525)$, $γf_0(1370)$, $γf_0(1710)$. Agreement with experimental data is found for three available ratios, without using free parameters, and predictions are done for other cases.
We discuss decays and productions for the possible molecular states formed by bottom mesons B (B*) and anti-B (anti-B*). The twin resonances found by Belle, Zb(10610) and Zb(10650), are such candidates. The spin wave functions of the molecular states are rearranged into those of heavy and light spin degrees of freedom by using the re-coupling formulae of angular momentum. By applying the heavy quark symmetry we derive model independent relations among various decay and production rates, which can be tested in experiments.
The strong decays of the two resonances $η(2225)$ and $ϕ(2170)$ are discussed for selected decay channels. The two resonances are considered as the $Λ\barΛ$ bound states in the molecular scenario. The phenomenological hadronic molecular approach is employed for the calculation of respective decay modes using effective Lagrangians. Our results show that the decay modes $η(2225)\to K^*K$ and $ϕ(2175) \to KK$ dominate over the partial decay widths of $η(2275)\to VV (ϕϕ, ωω, K^*K^*)$ and $ϕ(2175)\to VS (ωσ, K^*K^*_0(800), ϕf_0(980))$ due to phase space and couplings.
Based on the picture that the $ f_0(1370), f_0(1710), f_2(1270), f'_2(1525), \bar{K}^{*0}_2(1430)$ resonances are dynamically generated from the vector-vector interaction, we study the decays $J/ψ\to ϕ(ω) f_0(1370) [f_0(1710)]$, $J/ψ\to ϕ(ω) f_2(1270) [f'_2(1525)]$, and $J/ψ\to K^{*0} \bar{K}^{*0}_2(1430)$ and make predictions for seven independent ratios that can be done among them. The starting mechanism is that the $J/ψ$ decays into three vectors, followed by the final state interaction of a pair of them. The weights of the different three vector primary channels are obtained from the basic…
By assuming that $Y(4260)$ is a $D_1\bar D$ molecular state, we investigate some hidden-charm and charmed pair decay channels of $Y(4260)$ via intermediate $D_1\bar D$ 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 $D_1 \bar D$ meson loops are crucial for driving these transitions of $Y(4260)$ studied here. The coupled channel effects turn out to be more important in $Y(4260) \to D^{*}\bar{D}^{*}$, which can be tested in the future experiments.
Investigating the Molecular Nature of $Λ_b(6146)$ and $Λ_b(6152)$ via Strong Decays and Predicting Their Heavy-Quark Symmetry Partners
本研究假设Λ_b(6146)和Λ_b(6152)为\bar{B}^{*}N分子态，通过强衰变计算分析其结构，支持Λ_b(6146)的分子解释，预测了多个重夸克对称伙伴态，为实验探索重子结构提供参考。
In this work, we first propose the isovector $nD^{*}_0(2400)^0$ molecular state to explain the enhancement structure around 3250 MeV ($X_c(3250)^0$) in the $Σ_c^{++}π^-π^-$ invariant mass spectrum newly observed by the BaBar Collaboration. Under this molecular state configuration, both the analysis of the mass spectrum and the study of its dominant decay channel can well depict its resonance parameters measured by BaBar. Our investigation also shows that the isovector $nD^{*}_0(2400)^0$ molecular state can decay into $Σ_c^{++}π^-π^-$, which is consistent with the experimental observation. Thes…
In this work, we study the strong decay of the newly observed $P_{cs}(4459)$ assuming that it is a pure $Ξ_c\bar{D}^{*}$ molecular state. Considering two possible spin-parity assignments $J^P=1/2^{-}$ and $J^P=3/2^{-}$ the partial decay widths of the $Ξ_c\bar{D}^{*}$ molecular state into $J/ψΛ$, $D_s^{-}Λ_c^{+}$, and $DΞ_c^{(')}$ final states through hadronic loops are evaluated with the help of the effective Lagrangians. In comparison with the LHCb data, the spin-party $J^P=1/2^{-}$ the assignment is preferred while this of $J^P=3/2^{-}$ is disfavored. The $P_{cs}(4459)$ in spin-parity $J^P=3…
Hidden Charm Decays of $Y(4626)$ in a $D_{s}^{*+}D_{s1}(2536)^{-}$ Molecular Frame
本研究将 $Y(4626)$ 视为S波 $D_{s}^{*+}D_{s1}(2536)^{-}$ 分子态，用有效拉格朗日方法估算其多个隐粲衰变道的分宽度，提出通过 $e^+e^-\to J/ψη^{(\text{'})}$ 过程检验该分子态解释的实验方案。
Within a picture of the $f_1(1285)$ being a dynamically generated resonance from the $ K^*\bar K$ interactions, we estimate the rates for the radiative transitions of the $f_1(1285)$ meson to the vector mesons $ρ^0$,$ω$ and $ϕ$. These radiative decays proceed via the kaon loop diagrams. The calculated results are in fair agreement with the experimental measurements. Some predictions can be tested by experiments and their implementation and comparison with these predictions will be valuable to decode the nature of the $f_1(1285)$ state.
Stimulated by the measurement of the $Jψϕ$ decay model of $Y(4274)$ by the LHCb Collaboration, we consider a possible interpretation of this state as a hadron molecular-a bound state of $D_s$ and $\bar{D}_{s0}(2317)$ mesons. Using effective Lagrangian approach, we calculate the two-body strong decay channels $Y(4274)\to{}J/ψϕ,χ_{c0}η,χ_{c0}η,D^{*}_s\bar{D}_s$, $D\bar{D}^{*}$, $K\bar{K}^{*}$, and $ϕϕ$ through hadronic loops and three-body decays into $π^0{}D_s\bar{D}_s$. In comparison with the LHCb data, our results show that $Y(4274)$ cannot be assigned to be a $D_s\bar{D}_{s0}(2317)$ molecula…
The $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$ observed by the LHCb Collaboration are very likely to be $S$-wave $Σ_c\bar{D}^{(*)}$ molecular candidates due to their near-threshold character. In this work, we study the hidden-charm decay modes of these $P_c$ states, $P_c\to J/ψp(η_cp)$, using a quark interchange model. The decay mechanism for the $P_c\to J/ψp(η_cp)$ processes arises from the quark-quark interactions, where all parameters are determined by the mass spectra of mesons. We present our results in two scenarios. In scenario I, we perform the dynamical calculations and treat the $P_c$…
Decay behavior of hidden-strange hadronic molecular state $N(2270)$
本文通过有效拉格朗日方法系统研究隐奇异分子态 $N(2270)$ 的衰变，发现不同 $J^P$ 假设下主要衰变道相同但部分道有差异，为实验鉴别其量子数和内部结构提供指导。
Inspired by the $P_{cs}(4459)$ reported by the LHCb collaboration recently, we investigate the $P_{cs}(4459)$ production from $Ξ_b$ decay in a molecular scenario using an effective Lagrangian approach. With different $J^P$ assignments to $P_{cs}(4459)$, the magnitude of branching fractions of $Ξ_b \to P_{cs}(4459) K$ is estimated, which is of the order of $10^{-4}$. Together with the decay properties of $P_{cs}(4459)$, the present estimations could be further testified by precise measurements and contribute to a better understanding of the molecular interpretations and the exploration of $J^P$…
Very recently, three new structures $Ξ_c(2923)^0$, $Ξ(2938)^0$, and $Ξ(2964)^0$ at the invariant mass spectrum of $Λ_c^{+}K^{-}$ observed by the LHCb Collaboration triggers a hot discussion about their inner structure. In this work, we study the strong decay mode of the newly observed $Ξ_c$ assuming that the $Ξ_c$ is a $\bar{D}Λ-\bar{D}Σ$ molecular state. With the possible quantum numbers $J^p=1/2^{\pm}$ and $3/2^{\pm}$, the partial decay widths of the $\bar{D}Λ-\bar{D}Σ$ molecular state into the $Λ_c^{+}K^{-}$, $Σ_c^{+}K^{-}$,and $Ξ_c^{+}π^{-}$ final states through hadronic loop are calculate…
Exploring pion emission properties of (strange) hidden-charm molecular pentaquarks in a chiral quark model
针对$P_c$、$P_{cs}$五夸克态内部结构未知的问题，在手征夸克模型下考虑耦合道效应验证π介子发射可作为结构探测灵敏探针，为相关实验研究提供理论指引。
Radiative decays of the predicted P-wave $D\bar{D}^*$ molecular state: the $0^{-+}$ case
本文用唯象拉格朗日方法研究P波$D\bar{D}^*$分子态$G_0$的辐射衰变，发现$\gamma\omega$道为主导，并建议通过$Y(4230)\to\gamma G_0\to\gamma\omega J/\psi$级联衰变寻找该态。
Strong decays of the charmonium-like state $Y(4320)$ have been studied in the framework of the covariant confined quark model. The resonance $Y$ has been interpreted as a four-quark state of the molecular type. We evaluate the hidden-charm decay width of $Y$ to a vector and a scalar, with the latter decaying subsequently to a pair of charged pseudoscalar states. The strong decay modes $Y \!\to\! π^{+}π^{-}J/Ψ$ and $Y \!\to\! K^{+}K^{-} J/Ψ$ have been studied by involving the scalar resonance state $f_0(980)$. We have calculated the fractal widths of the related strong decays and the branching …
The inner structures of the multiquark states are an interesting subject in hadron physics, generally they may be in tetraquark states which are composed of colored constituents, or in molecular states which are composed of two color singlets, or their mixtures. Therefore, the mechanisms which bind the constituents in a unique system and induce the multiquark states to decay would be different in those cases. In this work, using the quantum mechanics we analyze the dynamical mechanisms inducing decays of the tetraquarks where $Y(4630)$ stands as an example for the study, we also comment on the…
Roles of $\bar{D}^{*}K^{*}$ and $D^*\bar{D}$ molecular states in decay $B^+ \to D^{*+} D^- K^+$
本文通过单玻色子交换模型与准势Bethe-Salpeter方程研究B+→D*+D−K+衰变，发现2900 MeV附近增强支持T*c̄s̄0(2870)0为D̄*K*分子态，而D*D̄分子态对χc1(3872)无显著贡献。
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