arXiv subjects

Takayuki Matsuki

Publications and source records attributed to Takayuki Matsuki.

At least 55 records · Page 3Linked to original sources

arXiv2016

Understanding $B^-\rightarrow X(3823)K^-$ via rescattering mechanism and predicting $B^-\to η_{c2} (^1D_2)/ψ_3(^3D_3)K^-$

We study the observed $B^-\rightarrow X(3823)K^-$ decay via rescattering mechanism and show that this branching ratio is well reproduced by this mechanism. We further extend this theoretical framework to investigate the decays of $B^-\toη_{c2} (^1D_2)/ψ_3(^3D_3)K^-$, where the $η_{c2} (^1D_2)$ and the $ψ_3(^3D_3)$ are $D$-wave charmonium partners of the $X(3823)$. Our results show that the branching ratios, $B^-\to η_{c2}(^1D_2) K^-$ and $B^-\to ψ_3(^3D_3) K^-$, are of the order of $10^{-5}$, which can be accessible at LHCb, Belle and forthcoming BelleII.

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arXiv2016

Approximate degeneracy of heavy-light mesons with the same $L$

Careful observation of the experimental spectra of heavy-light mesons tells us that heavy-light mesons with the same angular momentum $L$ are almost degenerate. The estimate is given how much this degeneracy is broken in our relativistic potential model, and it is analytically shown that expectation values of a commutator between the lowest order Hamiltonian and ${\vec L}^{~2}$ are of the order of $1/m_Q$ with a heavy quark mass $m_Q$. It turns out that nonrelativistic approximation of heavy quark system has a rotational symmetry and hence degeneracy among states with the same $L$. This feature can be tested by measuring higher orbitally and radially excited heavy-light meson spectra for $D/D_s/B/B_s$ in LHCb and forthcoming BelleII.

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arXiv2016

Search for missing $ψ(4S)$ in the $e^+e^-\to π^+π^-ψ(2S)$ process

A detailed analysis to find a missing $ψ(4S)$ is made by utilizing the recent precise mesurements of the cross section for the process $e^+e^-\to ψ(2S)π^+π^-$ by Belle. Assuming three resonances $Y(4360)$, $Y(4660)$, and $ψ(4S)$ to fit the data, we obtain the resonance parameters for $ψ(4S)$ as $m=4243$ MeV and $Γ=16 \pm 31$ MeV showing a narrow state as predicted before. A combined fit to the data $e^+ e^- \to ψ(2S) π^+ π^-, \ h_c π^+ π^-$, and $χ_{c0} ω$ is also performed to obtain the similar resonance parameters of $ψ(4S)$. The upper limit of the branching ratio is fitted to be $\mathcal{B}(ψ(4S)\toψ(2S)π^+π^-) < 3\times 10^{-3}$, which can be understood by hadronic loop contributions in reasonable parameters range. In addition, the ratios of the branching ratios of the $ψ(4S)$ dipion transition to the one of $ψ(4S)\toχ_{c0}ω$ are fitted, which can be further measured by BESIII and forthcoming BelleII to confirm the existence of $ψ(4S)$.

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arXiv2015

Higher radial and orbital excitations in the charmed meson family

Considering abundant experimental information of charmed mesons and the present research status, in this work we systematically study higher radial and orbital excitations in the charmed meson family by analyzing the mass spectrum and calculating their two-body OZI-allowed decay behaviors. This phenomenological analysis not only reveals underlying propertes of the newly observed charmed states $D(2550)$, $D^*(2600)$, $D^*(2760)$, $D(2750)$, $D_J(2580)$, $D^*_J(2650)$, $D^*_J(2760)$, $D_J(2740)$, $D_J(3000)$ and $D^*_J(3000)$, but also provides valuable information of the charmed mesons still missing in experiments.

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arXiv2015

High-spin mesons below 3 GeV

In this work, we study the high-spin states with masses below 3 GeV observed in experiments and we perform analysis of mass spectrum and investigation of strong decay behaviors of the high-spin states. Comparing our results with the experimental data, we can reveal the underlying properties of these high-spin states; more importantly, we also predict their abundant decay features, which can provide valuable information for experimental exploration of these high-spin states.

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arXiv2015

Observation of $e^+e^-\to χ_{c0}ω$ and missing higher charmonium $ψ(4S)$

Stimulated by the recent BESIII observation of a new resonance in $e^+ e^- \to ωχ_{c0}$ and by the fact that this state is consistent with our predicted $ψ(4S)$, in this work we estimate the meson loop contribution to $ψ(4S) \to ωχ_{c0}$. The evaluation indicates that our theoretical estimate can overlap with the experimental data in a reasonable parameter range. This fact shows that introduction of the missing higher charmonium $ψ(4S)$ provides a possible explanation to the recent BESIII observation. The upper limit of a branching ratio of $ψ(4S) \to ηJ/ψ$ is also predicted as $1.9 \times 10^{-3}$, which can be further tested by BESIII, Belle and forthcoming BelleII.

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arXiv2015

Light axial vector mesons

Inspired by the abundant experimental observation of axial-vector states, we study whether the observed axial-vector states can be categorized into the conventional axial-vector meson family. In this paper we carry out an analysis based on the mass spectra and two-body Okubo-Zweig-Iizuka-allowed decays. Besides testing the possible axial-vector meson assignments, we also predict abundant information for their decays and the properties of some missing axial-vector mesons, which are valuable for further experimental exploration of the observed and predicted axial-vector mesons.

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arXiv2015

Hidden-charm decays of $X(3915)$ and $Z(3930)$ as the P-wave charmonia

In this work, we investigate the $X(3915)$ and $Z(3930)$ decays into $J/ψω$ with the $χ_{c0}^\prime(2P)$ and $χ_{c2}^\prime (2P)$ assignments to $X(3915)$ and $Z(3930)$, respectively. The results show that the decay width of $Z(3930)\to J/ψω$ is at least one order smaller than that of $X(3915)\to J/ψω$. This observation explains why only one structure $X(3915)$ has been observed in the $J/ψω$ invariant mass spectrum for the process $γγ\to J/ψω$.

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arXiv2015

Charmed-strange mesons revisited: mass spectra and strong decays

Inspired by the present experimental status of charmed-strange mesons, we perform a systematic study of the charmed-strange meson family, in which we calculate the mass spectra of the charmed-strange meson family by taking a screening effect into account in the Godfrey-Isgur model and investigate the corresponding strong decays via the quark pair creation model. These phenomenological analyses of charmed-strange mesons not only shed light on the features of the observed charmed-strange states, but also provide important information on future experimental search for the missing higher radial and orbital excitations in the charmed-strange meson family, which will be valuable task in LHCb, forthcoming BelleII and PANDA.

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arXiv2015

Charged charmonium-like structures and the initial single chiral particle emission mechanism

This paper summarizes what we have done so far to explain charged charmonium/bottomonium-like structures using a hadronic triangle diagram which we call the initial single chiral particle emission mechanism. We discuss processes like $A\to A'+P+P'$ in which two chiral particles $P$ and $P'$ are emitted from $A$. In the intermediate we consider a hadronic one-loop diagram in which $D^{(*)}/D_s^{(*)}/B^{(*)}/B_s^{(*)}$ are included to explain some enhancements experimentally observed. Using this mechanism we explain some of the exotic enhancements and predict a couple of enhancement structures.

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arXiv2015

Pseudotensor meson family

The pseudoscalar tensor states, $π_2$, $η_2$, and $K_2$, are systematically studied through the Okubo-Zweig-Iizuka- allowed two-body strong decays, including both the observed states reported by the Particle Data Group and the predicted states. Phenomenological analysis combined with the experimental data not only can test the assignments to these discussed states, but it can also predict more abundant information {on} their partial decay widths, which is helpful in the experimental study of these observed and predicted pseudotensor states.

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arXiv2014

Prediction of a missing higher charmonium around 4.26 GeV in $J/ψ$ family

Inspired by the similarity of mass gaps of $J/ψ$ and $Υ$ families, the prediction of missing higher charmonium with mass $4263$ MeV and very narrow width is made. In addition, the properties of two charmonium-like states, $X(3940)$ and $X(4160)$, and charmonium $ψ(4415)$ are discussed. Here, $X(3940)$ as $η_c(3S)$ is established while the explanation of $X(4160)$ to be $η_c(4S)$ is fully excluded and $η_c(4S)$ is typically a very narrow state. These predictions can be accessible at BESIII, Belle and BelleII in near future.

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arXiv2014

Prediction of charmoniumlike structures in the hidden-charm di-eta decays of higher charmonia

Considering the situation that a single chiral partilce, $η$, is initially emitted, we study the hidden-charm di-eta decays of charmoniumlike state $Y(4660)$ and the predicted charmonium $ψ(4790)$, i.e., $Y(4660)/ψ(4790) \to J/ψηη$ through the inetermediates, $η\left[D^{(*)}\bar{D}^{(*)}\right]$ and/or $η \left[D_s^{+(*)}{D}_s^{-(*)}\right]$, and answer to the important question whether there exist isoscalar charmoniumlike structures in the $D^{(*)}\bar{D}^{(*)}$ and/or $D_s^{+(*)}{D}_s^{-(*)}$ channels. Our results predict that there will be enhancement structures near $D\bar{D}^*$, $D^*\bar{D}^*$ and $D_s\bar{D}_s^*$ thresholds for $Y(4660)$ and near $D^*\bar{D}^*$, $D_s\bar{D}_s^*$ and $D_s^*\bar{D}_s^*$ thresholds for $ψ(4790)$ in the $M_{\mathrm{max}}({J/ψη})$ distributions of $Y(4660)/ψ(4790) \to ηηJ/ψ$, respectively. These peaks are accessible at future experiments, especially BESIII, Belle, BaBar and forthcoming BelleII.

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arXiv2014

Explaining the anomalous $Υ(5S)\to χ_{bJ}ω$ decays through the hadronic loop effect

In this work, we carry out the study on $Υ(5S)\to χ_{bJ}ω$ ($J=0,1,2$) by considering the hadronic loop mechanism. Our results show that the Belle's preliminary data of the branching ratios for $Υ(5S)\to χ_{bJ}ω$ can be well reproduced in our calculation with a common parameter range, which reflects the similarity among these $Υ(5S)\to χ_{bJ}ω$ decays of concern.

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arXiv2014

Phenomenological study of the isovector tensor meson family

In this work, we study all the observed $a_2$ states and group them into the $a_2$ meson family, where their total and partial decay widths are calculated via the quark pair creation model. Taking into account the present experimental data, we further give the corresponding phenomenological analysis, which is valuable to test whether each $a_2$ state can be assigned into the $a_2$ meson family. What is more important is that the prediction of their decay behaviors will be helpful for future experimental study of the $a_2$ states.

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arXiv2014

Newly observed $B(5970)$ and the predictions of its spin and strange partners

Using the effective Lagrangian approach, we study the decay behavior of the newly observed $B(5970)$ meson, which is assigned as the $2^3S_1$ state in the $B$ meson family. What is more important is that we predict the information of the partial and total decay decay widths of $B(2^1S_0)$, $B_s(2^1S_0)$ and $B_s(2^3S_1)$ as the spin and strange partners of $B(5970)$, which is valuable to future experimental search for these missing states.

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arXiv2014

Simulating the charged charmoniumlike structure $Z_c(4025)$

Inspired by recent observation of charged charmoniumlike structure $Z_c(4025)$, we explore the $Y(4260)\to (D^*\bar{D}^*)^- π^+$ decay through the initial-single-pion-emission mechanism, where the $D^*\bar{D}^*\to D^*\bar{D}^*$ interaction is studied by the ladder approximation including a non-interacting case. Our calculation of the differential decay width for $Y(4260)\to (D^*\bar{D}^*)^- π^+$ indicates that a charged enhancement structure around $D^*\bar{D}^*$ appears in the $D^*\bar{D}^*$ invariant mass spectrum for this process, which can correspond to newly observed $Z_c(4025)$ structure.

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arXiv2013

Newly observed $D_J(3000)^{+,0}$ and $D_J^*(3000)^0$ as $2P$ states in $D$ meson family

In this work, we study the newly observed $D_J(3000)$ and $D_J^*(3000)$ through the analysis of mass spectrum and calculation of the corresponding two-body strong decay behaviors. Our results show that $D_J(3000)$ and $D_J^*(3000)$ are explained as the $2P(1^+)$ and $2^3P_0$ states in the $D$ meson family, respectively, which is supported by the calculated masses of these two states and their decay behaviors. As a byproduct, the decay behaviors of $3^1S_0$, $3^3S_1$, $2D(2^-)$, $2^3D_1$, $2D^\prime(2^-)$, $2^3D_3$, $2P^\prime(1^+)$, $2^3P_2$, $1F(3^+)$, $1^3F_2$, $1F^\prime(3^+)$, and $1^3F_4$ states are also given, which will be helpful to further experimentally study mixings of these $D$ mesons, too.

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