scholarly journals Strong decays of the newly $$P_{cs}(4459)$$ as a strange hidden-charm $$\Xi _c{\bar{D}}^*$$ molecule

2021 ◽  
Vol 81 (2) ◽  
Author(s):  
Rui Chen
Keyword(s):  
Decay Width ◽  
Lhcb Collaboration ◽  
Partial Decay Width ◽  
Strong Decay

AbstractIn our former work [arXiv:2011.07214], the $$P_{cs}(4459)$$ P cs ( 4459 ) observed by the LHCb Collaboration can be explained as a coupled strange hidden-charm $$\Xi _c{\bar{D}}^*/\Xi _c^*{\bar{D}}/\Xi _c'{\bar{D}}^*/\Xi _c^*{\bar{D}}^*$$ Ξ c D ¯ ∗ / Ξ c ∗ D ¯ / Ξ c ′ D ¯ ∗ / Ξ c ∗ D ¯ ∗ molecule with $$I(J^P)=0(3/2^-)$$ I ( J P ) = 0 ( 3 / 2 - ) . Here, we further discuss the two-body strong decay behaviors of the $$P_{cs}(4459)$$ P cs ( 4459 ) in the meson-baryon molecular scenario by input the former obtained bound solutions. Our results support the $$P_{cs}(4459)$$ P cs ( 4459 ) as the strange hidden-charm $$\Xi _c{\bar{D}}^*$$ Ξ c D ¯ ∗ molecule with $$I(J^P)=0(3/2^-)$$ I ( J P ) = 0 ( 3 / 2 - ) . The relative decay ratio between $$\Lambda _cD_s^*$$ Λ c D s ∗ and $$J/\psi \Lambda $$ J / ψ Λ is around 10, where the partial decay width for the $$\Lambda _cD_s^*$$ Λ c D s ∗ channel is around 0.6 to 2.0 MeV.

scholarly journals Strong decays of the $$\varXi (1620)^0$$ as a $$\varLambda {\bar{K}}$$ and $$\varSigma {\bar{K}}$$ molecule

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Yin Huang ◽  
Lisheng Geng
Keyword(s):  
Decay Width ◽  
Decay Channel ◽  
Molecular State ◽  
The Other ◽  
Partial Decay Width ◽  
Total Width ◽  
Strong Decay ◽  
Spin Parity

AbstractIn this work, we study the strong decays of the newly observed $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 assuming that it is a meson-baryon molecular state of $$\varLambda {\bar{K}}$$ Λ K ¯ and $$\varSigma {\bar{K}}$$ Σ K ¯ . We consider four possible spin-parity assignments $$J^P=1/2^{\pm }$$ J P = 1 / 2 ± and $$3/2^{\pm }$$ 3 / 2 ± for the $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 , and evaluate its partial decay width into $$\varXi \pi $$ Ξ π and $$\varXi \pi \pi $$ Ξ π π via hadronic loops with the help of effective Lagrangians. In comparison with the Belle data, the calculated decay width favors the spin-party assignment $$1/2^-$$ 1 / 2 - while the other spin-parity assignments do not yield a decay width consistent with data in the molecule picture. We find that about 52–68% of the total width comes from the $${\bar{K}}\varLambda $$ K ¯ Λ channel, while the rest is provided by the $${\bar{K}}\varSigma $$ K ¯ Σ channel. As a result, both channels are important in explaining the strong decay of the $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 . In addition, the transition $$\varXi (1620)^0\rightarrow \pi \varXi $$ Ξ ( 1620 ) 0 → π Ξ is the main decay channel in the $$J^{P}=1/2^{-}$$ J P = 1 / 2 - case, which almost saturates the total width. These information are helpful to further understand the nature of the $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 .

scholarly journals Strong decays of $${\bar{D}}^{*}K^{*}$$ molecules and the newly observed $$X_{0,1}$$ states

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Yin Huang ◽  
Jun-Xu Lu ◽  
Ju-Jun Xie ◽  
Li-Sheng Geng
Keyword(s):  
Wave Function ◽  
Decay Width ◽  
Lhcb Collaboration ◽  
The Other ◽  
Strong Decay ◽  
Compositeness Condition ◽  
Other Hand ◽  
New States ◽  
Three Body

AbstractLately, the LHCb Collaboration reported the discovery of two new states in the $$B^+\rightarrow D^+D^- K^+$$ B + → D + D - K + decay, i.e., $$X_0(2866)$$ X 0 ( 2866 ) and $$X_1(2904)$$ X 1 ( 2904 ) . In the present work, we study whether these states can be understood as $${\bar{D}}^*K^*$$ D ¯ ∗ K ∗ molecules from the perspective of their two-body strong decays into $$D^-K^+$$ D - K + via triangle diagrams and three-body decays into $${\bar{D}}^*K\pi $$ D ¯ ∗ K π . The coupling of the two states to $${\bar{D}}^*K^*$$ D ¯ ∗ K ∗ are determined from the Weinberg compositeness condition, while the other relevant couplings are well known. The obtained strong decay width for the $$X_0(2866)$$ X 0 ( 2866 ) state, in marginal agreement with the experimental value within the uncertainty of the model, hints at a large $${\bar{D}}^*K^*$$ D ¯ ∗ K ∗ component in its wave function. On the other hand, the strong decay width for the $$X_1(2904)$$ X 1 ( 2904 ) state, much smaller than its experimental counterpart, effectively rules out its assignment as a $${\bar{D}}^*K^*$$ D ¯ ∗ K ∗ molecule.

MEASUREMENT OF THE TWO-PHOTON DECAY WIDTH OF THE INTERMEDIATE MASS HIGGS BOSONS IN A PHOTON-PHOTON COLLIDER

1998 ◽  
Vol 13 (14) ◽  
pp. 2411-2416 ◽  
Author(s):  
T. OHGAKI ◽  
T. TAKAHASHI ◽  
I. WATANABE ◽  
T. TAUCHI
Keyword(s):  
Higgs Boson ◽  
Decay Width ◽  
Statistical Error ◽  
Higgs Bosons ◽  
Partial Decay Width ◽  
Intermediate Mass ◽  
Two Photon ◽  
Photon Decay ◽  
Photon Collider ◽  
B Quark

The feasibility of a measurement of the partial decay width of the intermediate-mass Higgs boson(MH=120 GeV ) into two photons at a photon-photon collider is studied by a simulation. It is found that the two-photon decay width can be measured with the statistical error of 7.6% with the integrated luminosity of 10fb-1. We also discussed a possibility toward further improvement with sophisticated b-quark tagging technique.

scholarly journals Comment on the X(3915) nonstandard hadron candidate

2019 ◽  
Vol 212 ◽  
pp. 02009 ◽  
Author(s):  
Stephen Lars Olsen
Keyword(s):  
Experimental Evidence ◽  
Decay Width ◽  
Partial Decay Width ◽  
Charmonium State ◽  
Radial Excitation ◽  
Order Of Magnitude

I review the experimental evidence for the X(3915), the candidate nonstandard meson associated with ωJ/ψ resonance-like peaks in B → KωJ/ψ and γγ → ωJ/ψ near M(ωJ/ψ) = 3920 MeV, and address the conjecture that it can be identified as the χ′c2, the radial excitation of the χc2 charmonium state. Since the partial decay width for B → KX(3915) is at least an order-of-magnitude higher than that for B → Kχc2, its assignment as the χ’c2 is dubious.

scholarly journals Analysis of the X(3842) as a D-wave charmonium meson

2019 ◽  
Vol 34 (26) ◽  
pp. 1950151
Author(s):  
Guo-Liang Yu ◽  
Zhi-Gang Wang
Keyword(s):  
Experimental Data ◽  
Operator Product Expansion ◽  
Mass Formula ◽  
Decay Constant ◽  
Sum Rules ◽  
Lhcb Collaboration ◽  
Operator Product ◽  
Strong Decay ◽  
State Formula ◽  
Vacuum Condensates

In this paper, we assign the newly reported state [Formula: see text] to be a [Formula: see text]-wave [Formula: see text] meson, and study its mass and decay constant with QCD sum rules by considering the contributions of vacuum condensates up to dimension-6 in the operator product expansion. The predicted mass [Formula: see text] GeV is in agreement with the experimental data [Formula: see text] MeV from the LHCb collaboration. This result supports assigning [Formula: see text] as the [Formula: see text] charmonium meson. In this case, its predicted strong decay width with the [Formula: see text] decay model is compatible with the experimental data.

scholarly journals Strong decays of heavy tensor mesons in QCD sum rules

2016 ◽  
Vol 31 (06) ◽  
pp. 1650036 ◽  
Author(s):  
Zhen-Yu Li ◽  
Zhi-Gang Wang ◽  
Guo-Liang Yu
Keyword(s):  
Decay Width ◽  
Sum Rules ◽  
Order Approximation ◽  
Coupling Constants ◽  
Leading Order ◽  
Strong Decay ◽  
Qcd Sum Rules ◽  
Consistent Description ◽  
Decay Widths ◽  
Tensor Formula

In this paper, the tensor–vector–pseudoscalar (TVP) type of vertices are analyzed with the QCD sum rules (QCDSR) and the local-QCD sum rules (SR) in the leading-order approximation and the hadronic coupling constants [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] together with the corresponding decay widths are then calculated. The results indicate that QCDSR as well as the local-QCDSR give a consistent description. The calculated strong decay widths and decay width ratios are compared with the available experimental and other theoretical values. Finally, the total widths [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] are discussed in detail. The results show that these total widths are underestimated, especially for the tensor [Formula: see text] and [Formula: see text] mesons where the obtained predictions are almost a factor of 2 lower than measured decay widths.

scholarly journals STRUCTURE OF Λ*(1405) AND THE Λ*-MESON-BARYON COUPLING CONSTANTS

2011 ◽  
Vol 26 (03n04) ◽  
pp. 619-621 ◽  
Author(s):  
C. S. AN ◽  
B. SAGHAI
Keyword(s):  
Quark Model ◽  
Decay Width ◽  
Constituent Quark ◽  
Constituent Quark Model ◽  
Coupling Constants ◽  
Strong Decay ◽  
Quark Structure

Within an extended chiral constituent quark model, three- and five-quark structure of the S01 resonance Λ(1405) is investigated with respect to the coupling constants [Formula: see text] and [Formula: see text]. Our findings corroborate with about 50% of five-quark admixture in the Λ(1405) needed in reproducing the strong decay width, ΓΛ(1405)→(Σπ)°.

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