Light vector meson and heavy baryon strong interaction (2009)
Huang, Peng-Zhi, Chen, Hua-Xing, Zhu, Shi-Lin
We calculate the coupling constants between the light vector mesons and heavy baryons within the framework of the light-cone QCD sum rule in the leading order of heavy quark effective theory. Most...
The Vector Meson And Heavy Meson Strong Interaction (2009)
Huang, Peng-Zhi, Zhang, Liang, Zhu, Shi-Lin
We calculate the coupling constants between the light vector mesons and heavy mesons within the framework of the light-cone QCD sum rule in the leading order of heavy quark effective theory. The sum...
The Possible J^{PC}=0^{--} Exotic State (2009)
Jiao, Chun-Kun, Chen, Wei, Chen, Hua-Xing, Zhu, Shi-Lin
In order to explore the possible existence of the exotic $0^{--}$ state, we have constructed the tetraquark interpolating operators systematically. As a byproduct, we notice the $0^{+-}$ tetraquark...
Large $N_c$ Expansion and the Parity Violating $\pi, N, \Delta$ Couplings (2009)
In the limit of large $N_c$ we first consider the $N_c$ ordering of the various parity violating $\pi, N, \Delta$ couplings. Then we derive the relations among these couplings and consistency...
Light Pseudoscalar Meson and Heavy Meson Scattering Lengths (2009)
Liu, Yan-Rui, Liu, Xiang, Zhu, Shi-Lin
We have performed a systematical calculation of the pion ($\pi, K, \eta$) and heavy pseudoscalar meson S-wave scattering lengths up to ${\cal O}(p^3)$ in the chiral perturbation theory in the heavy...
Y(4143) is probably a molecular partner of Y(3930) (2009)
After discussing the various possible interpretations of the Y(4143) signal observed by the CDF collaboration in the $J/\psi \phi$ mode, we tend to conclude that Y(4143) is probably a $D_s^\ast {\bar...
Scalar Tetraquark Currents With Application to the QCD Sum Rule (2008)
Chen, Hua-Xing, Hosaka, Atsushi, Zhu, Shi-Lin
We study the light scalar mesons in the QCD sum rule. We construct both the diquark-antidiquark currents $(qq)(\bar q \bar q)$ and the meson-meson currents $(\bar qq)(\bar qq)$. We find that there...
The I^G J^{PC}=0^+ 1^{-+} Tetraquark State (2008)
Chen, Hua-Xing, Hosaka, Atsushi, Zhu, Shi-Lin
We study the tetraquark state with I^G J^{PC} = 0^+ 1^{-+} in the QCD sum rule. We exhaust all possible flavor structures by using a diquark-antidiquark construction and find that the flavor...
X(3872) and Other Possible Heavy Molecular States (2008)
Liu, Xiang, Luo, Zhi-Gang, Liu, Yan-Rui, Zhu, Shi-Lin
We perform a systematic study of the possible molecular states composed of a pair of heavy mesons such as $D\bar D$, $D^\ast\bar D$, $D^\ast \bar D^\ast$ in the framework of the meson exchange model....
Chiral Properties of Baryon Fields with Flavor SU(3) Symmetry (2008)
Chen, Hua-Xing, Dmitrasinovic, V., Hosaka, Atsushi, Nagata, Keitaro, Zhu, Shi-Lin
We investigate chiral properties of local (non-derivative) fields of baryons consisting of three quarks with flavor SU(3) symmetry. We construct explicitly independent local three-quark fields...
The I^G J^{PC}=1^- 1^{-+} Tetraquark States (2008)
Chen, Hua-Xing, Hosaka, Atsushi, Zhu, Shi-Lin
We study the tetraquark states with I^G J^{PC}=1^- 1^{-+} in the QCD sum rule. After exhausting all possible flavor structures, we analyses both the SVZ and finite energy sum rules. Both approaches...
Semileptonic decays of $B_{s1}$, $B_{s2}^*$, $B_{s0}$ and $B_{s1}'$ (2008)
Luo, Zhi-Gang, Chen, Xiao-Lin, Liu, Xiang, Zhu, Shi-Lin
Stimulated by recent observations of the excited bottom-strange mesons $B_{s1}$ and $B_{s2}^*$, we calculate the semileptonic decays $B_{s0}, B_{s1}^{\prime}, B_{s1}, B_{s2}^*\to [D_s(1968),...
The two-body open charm decays of $Z^+(4430)$ (2008)
Liu, Xiang, Zhang, Bo, Zhu, Shi-Lin
The two-body open charm decays $Z^+(4430)\to D^{+}\bar{D}^{*0}, D^{*+}\bar{D}^{0}, D^{*+}\bar{D}^{*0}$ occur through the re-scattering mechanism and their branching ratios are strongly suppressed if...
$Z^+(4430)$ as a $D_1'{D}^* $ ($D_1{D}^* $) molecular state (2008)
Liu, Xiang, Liu, Yan-Rui, Deng, Wei-Zhen, Zhu, Shi-Lin
We reexamine whether $Z^+(4430)$ could be a $D_1'-{D}^*$ or $D_1-{D}^*$ molecular state after considering both the pion and $\sigma$ meson exchange potentials and introducing the form factor to take...
The Y(2175) State in the QCD Sum Rule (2008)
Chen, Hua-Xing, Liu, Xiang, Hosaka, Atsushi, Zhu, Shi-Lin
We study the mass of the state Y(2175) of J^{PC} = 1^{--} in the QCD sum rule. We construct both the diquark-antidiquark currents (ss)(s_bar s_bar) and the meson-meson currents (s_bar s)(s_bar s). We...
Is X(3872) {\sl Really} a Molecular State? (2008)
Liu, Yan-Rui, Liu, Xiang, Deng, Wei-Zhen, Zhu, Shi-Lin
After taking into account both the pion and sigma meson exchange potential, we have performed a dynamical calculation of the $D^0\bar{D}^{\ast0}$ system. The $\sigma$ meson exchange potential is...
The \Delta contribution to the parity-violating nucleon-nucleon force (2007)
Since a nucleon may be excited and transforms into a virtual $\Delta$ resonance easily, we consider the decuplet contribution to the parity-violating (PV) nucleon-nucleon interaction in the chiral...
The \Delta contribution to the parity-violating nucleon-nucleon force (2007)
Because the nucleon may be excited and transformed into a virtual $\Delta$ resonance easily, we consider the decuplet contribution to the parity-violating (PV) nucleon-nucleon interaction in the...
Light Scalar Mesons in the QCD Sum Rule (2007)
Chen, Hua-Xing, Hosaka, Atsushi, Zhu, Shi-Lin
We study the light scalar mesons in the QCD sum rule. We find that there are five independent scalar tetraquark currents in the local form, and we perform QCD sum rule analysis using both these...
Is Z^+(4430) a loosely bound molecular state? (2007)
Liu, Xiang, Liu, Yan-Rui, Deng, Wei-Zhen, Zhu, Shi-Lin
Since $Z^+(4430)$ lies very close to the threshold of $D^\ast{\bar D}_1$, we investigate whether $Z^+(4430)$ could be a loosely bound S-wave state of $D^\ast{\bar D}_1$ or $D^\ast{\bar D}^\prime_1$...
Liu, Xiang, Chen, Hua-Xing, Liu, Yan-Rui, Hosaka, Atsushi, Zhu, Shi-Lin
Recently CDF and D0 collaborations observed several bottom baryons. In this work we perform a systematic study of the masses of bottom baryons up to $1/m_Q$ in the framework of heavy quark effective...
Light Scalar Tetraquark Mesons in the QCD Sum Rule (2007)
Chen, Hua-Xing, Hosaka, Atsushi, Zhu, Shi-Lin
We study the lowest-lying scalar mesons in the QCD sum rule by considering them as tetraquark states. We find that there are five independent currents for each state with a certain flavor structure....
Spectroscopy of Mesons with Heavy Quarks (2007)
I will give a concise overview of mesons with heavy quarks including p-wave charmed mesons and charmonium (or charmonium-like) states such as X(3872), Y(4260), X(3940), Y(3940), Z(3930) etc. The...
The dispersive contribution of $\rho(1450,1700)$ decays and X(1576) (2007)
Zhang, Bo, Liu, Xiang, Zhu, Shi-Lin
We study whether the broad enhancement X(1576) arises from the final state interaction (FSI) of $\rho(1450,1700)\to \rho^+\rho^-\to K^{+}K^{-}$ decays. We consider both the absorptive and dispersive...
Strong decays of charmed baryons (2007)
Chen, Chong, Chen, Xiao-Lin, Liu, Xiang, Deng, Wei-Zhen, Zhu, Shi-Lin
There has been important experimental progress in the sector of heavy baryons in the past several years. We study the strong decays of the S-wave, P-wave, D-wave and radially excited charmed baryons...
The past four years has witnessed the renaissance of the hadron spectroscopy. Many interesting new hadron states were discovered experimentally, some of which do not fit into the quark model easily....
Decuplet contribution to the meson-baryon scattering lengths (2007)
We calculate decuplet contributions to the s-wave pseudoscalar meson octet-baryon scattering lengths to the third order in heavy baryon chiral perturbation theory (HB$\chi$PT). Using experimental...
X(1576) and the Final State Interaction Effect (2007)
Liu, Xiang, Zhang, Bo, Shen, Lei-Lei, Zhu, Shi-Lin
We study whether the broad peak X(1576) observed by BES Collaboration arises from the final state interaction effect of $\rho(1450,1700)$ decays. The interference effect could produce an enhancement...
Wei, Wei, Liu, Xiang, Zhu, Shi-Lin
We first extract the binding energy $\bar \Lambda$ and decay constants of the D wave heavy meson doublets $(1^{-},2^{-})$ and $(2^{-},3^{-})$ with QCD sum rule in the leading order of heavy quark...
New QCD Sum Rule for $D(0^+)$ (2006)
We derive a new QCD sum rule for $D(0^+)$ which has only the $D\pi$ continuum with a resonance in the hadron side, using the assumption similar to that has been successfully used in our previous work...
Contribution of $DK$ Continuum in the QCD Sum Rule for $D_{sJ}(2317)$ (2006)
Dai, Yuan-Ben, Li, Xin-Qiang, Zhu, Shi-Lin, Zuo, Ya-Bing
Using the soft-pion theorem and the assumption on the final-state interactions, we include the contribution of $DK$ continuum into the QCD sum rules for $D_{sJ}(2317)$ meson. We find that this...
The Hidden Charm Decay of $X(3872), Y(3940)$ and Final State Interaction Effects (2006)
Liu, Xiang, Zhang, Bo, Zhu, Shi-Lin
We investigate whether the final state interaction (FSI) effect plays a significant role in the large hidden charm decay width of X(3872) and Y(3940) using a model. Our numerical result suggests (1)...
QCD Sum Rule Study of the Masses of Light Tetraquark Scalar Mesons (2006)
Chen, Hua-Xing, Hosaka, Atsushi, Zhu, Shi-Lin
We study the low-lying scalar mesons of light u, d, s flavors in the QCD sum rule. Having all possible combinations of tetraquark currents in the local form, QCD sum rule analysis has been carefully...
$D_{sJ}(2860)$ and $D_{sJ}(2715)$ (2006)
Zhang, Bo, Liu, Xiang, Deng, Wei-Zhen, Zhu, Shi-Lin
Recently Babar Collaboration reported a new $c\bar{s}$ state $D_{sJ}(2860)$ and Belle Collaboration observed $D_{sJ}(2715)$. We investigate the strong decays of the excited $c\bar{s}$ states using...
The Possible Heavy Tetraquarks $qQ\bar q \bar Q$, $qq\bar Q \bar Q$ and $qQ\bar Q \bar Q$ (2006)
Cui, Ying, Chen, Xiao-Lin, Deng, Wei-Zhen, Zhu, Shi-Lin
Assuming X(3872) is a $qc \bar q \bar c$ tetraquark and using its mass as input, we perform a schematic study of the masses of possible heavy tetraquarks using the color-magnetic interaction with the...
Meson-baryon scattering lengths in HB$\chi$PT (2006)
We calculate the chiral corrections to the s-wave pseudoscalar meson octet-baryon scattering lengths $a_{MB}$ to ${\cal O}(p^3)$ in the SU(3) heavy baryon chiral perturbation theory (HB$\chi$PT)....
Isospin symmetry breaking of K and K* mesons (2006)
Chen, Hua-Xing, Hosaka, Atsushi, Zhu, Shi-Lin
We use the method of QCD sum rules to investigate the isospin symmetry breaking of K and K* mesons. The electromagnetic effect, difference between up and down current-quark masses and difference...
Decays of $D_{sj}^*(2317)$ and $D_{sj}(2460)$ Mesons in the Quark Model (2006)
Wang, Feng-Lin, Chen, Xiao-Lin, Lu, Da-Hai, Zhu, Shi-Lin, Deng, Wei-Zhen
We study the decay widths of the narrow resonances $D_{sj}^*(2317)$ and $D_{sj}(2460)$ in the chiral quark model, together with the well-known $D^\ast$ and $D_s^*$ mesons. All the parameters in our...
Exotic Tetraquark ud bar[s] bar[s] of J^P=0^+ in the QCD Sum Rule (2006)
Chen, Hua-Xing, Hosaka, Atsushi, Zhu, Shi-Lin
We study a QCD sum rule analysis for an exotic tetraquark ud bar[s] bar[s] of J^P=0^+ and I = 1. We construct q q bar[q] bar[q] currents in a local product form and find that there are five...
Radiative Decays of Decuplet Baryons, $\Lambda(1405)$ and $\Lambda (1520)$ Hyperons (2006)
Yu, Lang, Chen, Xiao-Lin, Deng, Wei-Zhen, Zhu, Shi-Lin
The chiral quark model gives a reasonably good description of many low-energy observables by incorporating the effective degrees carried by the constituent quarks and Goldstone bosons. We calculate...
Pionic Decays of $D_{sj}(2317)$, $D_{sj}(2460)$ and $B_{sj}(5718)$, $B_{sj}(5765)$ (2006)
Lu, Jie, Chen, Xiao-Lin, Deng, Wei-Zheng, Zhu, Shi-Lin
We estimate pionic decay widths of the narrow charm-strange resonances $D_{sj}(2317)$ and $D_{sj}(2460)$ using the $^3P_0$ model. Their one-pion decays occur through $\eta$-$\pi^0$ mixing while the...
X(1835): A Natural Candidate of $\eta^\prime$'s Second Radial Excitation (2005)
Recently BES collaboration observed one interesting resonance X(1835). We point out that its mass, total width, production rate and decay pattern favor its assignment as the second radial excitation...
The $J^P=1^+$ $ud\bar s\bar s$ Tetraquark (2005)
Cui, Ying, Chen, Xiao-Lin, Deng, Wei-Zhen, Zhu, Shi-Lin
Using the color-magnetic interaction Hamiltonian with SU(3) flavor symmetry breaking, we perform a schematic study of the masses of the $J^P=1^+$ tetraquarks in the anti-decuplet representation....
Strong decays of $D_{sJ}(2317)$ and $D_{sJ}(2460)$ (2005)
Wei, Wei, Huang, Peng-Zhi, Zhu, Shi-Lin
With the identification of ($D_{sJ}(2317), D_{sJ}(2460)$) as the ($0^+$, $1^+$) doublet in the heavy quark effective field theory, we derive the light cone QCD sum rule for the coupling of eta meson...
X(1835): A Possible Baryonium? (2005)
We point out that (1) the large $p\bar p$ coupling and suppressed mesonic coupling of X(1835) and (2) the suppression of the three-body strange final states strongly indicate that X(1835) may be a...
The Possible Interpretations of Y(4260) (2005)
The recently observed Y(4260) lies far above the decay threshold with a width less than 100 MeV. We argue that it's very difficult to accommodate Y(4260) as a conventional $c\bar c$ radial excitation...
We investigate the possible existence of the spin 3/2 pentaquark states using interpolating currents with K-N color-octet structure in the framework of QCD finite energy sum rule (FESR). We pay...
The Possible $J^{PC}I^G=2^{++}2^+$ State X(1600) (2004)
Wei, W., Zhang, L., Zhu, Shi-Lin
The interesting state X(1600) with $J^{PC}I^G=2^{++}2^+$ can't be a conventional $q \bar q$ meson in the quark model. Using a mixed interpolating current with different color configurations, we...
Theoretical Development on Pentaquarks (2004)
I first give a brief overview of the status of exotic hadron search so far. Then I review the recent theoretical development on pentaquarks. Finally I emphasize that none of theoretical formalisms...
Possible Interpretations of $D_{sJ}^+(2632)$ If It Really Exists (2004)
Dai, Yuan-Ben, Liu, Chun, Zhu, Shi-Lin
We analyze various possible interpretations of the narrow state $D_{sJ}^+(2632)$ observed by SELEX Collaboration recently, which lies above threshold and has abnormal decay pattern. These...
Nuclear Parity-Violation in Effective Field Theory (2004)
Zhu, Shi-Lin, Maekawa, C. M., Holstein, B. R., Ramsey-Musolf, M. J., Van Kolck, U
We reformulate the analysis of nuclear parity-violation (PV) within the framework of effective field theory (EFT). To order Q, the PV nucleon-nucleon (NN) interaction depends on five a priori unknown...
$D_{sJ}^+(2632)$: An Excellent Candidate of Tetraquarks (2004)
We analyze various possible interpretations of the narrow state $D_{sJ}(2632)$ which lies 100 MeV above threshold. This interesting state decays mainly into $D_s \eta$ instead of $D^0 K^+$. If this...
Since LEPS collaboration reported the first evidence of $\Theta^+$ pentaquark in early 2003, eleven other experimental groups have confirmed this exotic state while many other groups didn't see any...
Diquarks, Pentaquarks and Dibaryons (2004)
We explore the connection between pentaquarks and dibaryons composed of three diquarks in the framework of the diquark model. With the available experimental data on H dibaryon, we estimate the Pauli...
Heavy and Light Pentaquark Chiral Lagrangian (2004)
Using the SU(3) flavor symmetry, we construct the chiral Lagrangians for the light and heavy pentaquarks. The correction from the nonzero quark is taken into account perturbatively. We derive the...
$J^P={1/2}^-$ Pentaquarks in Jaffe and Wilczek's Diquark Model (2004)
If Jaffe and Wilczek's diquark picture for $\Theta_5$ pentaquark is correct, there should also exist a $SU_F$(3) pentaquark octet and singlet with no orbital excitation between the diquark pair,...
Song, Xing-Chang, Zhu, Shi-Lin
Using the picture of the flux tube model, we propose that the $\Theta_5$ pentaquark as the first candidate of the three-dimensional non-planar hadron with the extremely stable diamond structure. The...
We construct the spin-flavor wave functions of the possible heavy pentaquarks containing an anti-charm or anti-bottom quark using various clustered quark models. Then we estimate the masses and...
D_s(2317) and D_s(2457) from HQET Sum Rules (2004)
Dai, Yuan-Ben, Huang, Chao-Shang, Liu, Chun, Zhu, Shi-Lin
Within the framework of the heavy quark effective theory, QCD sum rules are used to calculate the masses of p-wave (c-bar s) states. The results for 0^+ and 1^+ states with the angular momentum of...
Magnetic Moments of $J^P={3/2}^+$ Pentaquarks (2003)
If the $J^P$ of $\Theta_5^+$ and $\Xi_5^{--}$ pentaquarks is really found to be ${1\over 2}^+$ by future experiments, they will be accompanied by $J^P={3\over 2}^+$ partners in some models. It is...
Pentaquark Magnetic Moments In Different Models (2003)
We calculate the magnetic moments of the pentaquark states from different models and compare our results with predictions of other groups.
Magnetic Moment of The $\Theta^+$ Pentaquark State (2003)
Huang, Peng-Zhi, Deng, Wei-Zhen, Chen, Xiao-Lin, Zhu, Shi-Lin
We have calculated the magnetic moment of the recently observed $\Theta^+$ pentaquark in the framework of the light cone QCD sum rules using the photon distribution amplitudes. We find that...
Understanding the Possible Proton Antiproton Bound State Observed by BES Collaboration (2003)
We comment on the quantum numbers and decay channels of the possible proton antiproton bound state observed by BES Collaboration. Based on the general symmetry consideration and available...
Understanding Pentaquark States in QCD (2003)
We estimate the mass of the pentaquark state with QCD sum rules and find that pentaquark states with isospin $I=0, 1, 2$ lie close to each other around $(1.55\pm 0.15)$ GeV. The experimentally...
Understanding the $D^+_{sJ}(2317)$ and $D^+_{sJ}(2460)$ with Sum Rules in HQET (2003)
Dai, Yuan-Ben, Huang, Chao-Shang, Liu, Chun, Zhu, Shi-Lin
In the framework of heavy quark effective theory we use QCD sum rules to calculate the masses of the $\bar c s$ $(0^+, 1^+)$ and $(1^+, 2^+)$ excited states. The results are consistent with that the...
Off-diagonal Goldberger-Treiman relation and its discrepancy (2002)
Zhu, Shi-Lin, Ramsey-Musolf, M. J.
We study the off-diagonal Goldberger-Treiman relation (ODGTR) and its discrepancy (ODGTD) in the N, Δ, π sector through O(p2) using heavy baryon chiral perturbation theory. To this order, the ODGTD...
Recoil order chiral corrections to baryon octet axial vector currents and large Nc QCD (2002)
Zhu, Shi-Lin, Sacco, G., Ramsey-Musolf, M. J.
We compute the chiral corrections to octet baryon axial vector currents through O(p3) in heavy baryon chiral perturbation theory, including both octet and decuplet baryon intermediate states. We...
The Off-diagonal Goldberger-Treiman Relation and Its Discrepancy (2002)
Zhu, Shi-Lin, Ramsey-Musolf, M. J.
We study the off-diagonal Goldberger-Treiman relation (ODGTR) and its discrepancy (ODGTD) in the N, Delta, pi sector through O(p^2) using heavy baryon chiral perturbation theory. To this order, the...
What Do We Know About the Strange Magnetic Radius? (2002)
Puglia, S. J., Ramsey-Musolf, M. J., Zhu, Shi-Lin
We analyze the q^2-dependence of the strange magnetic form factor, \GMS(q^2), using heavy baryon chiral perturbation theory (HBChPT) and dispersion relations. We find that in HBChPT a significant...
Electroweak radiative corrections to parity-violating electroexcitation of the Δ (2002)
Zhu, Shi-Lin, Maekawa, C. M., Sacco, G., Holstein, B. R., Ramsey-Musolf, M. J.
We analyze the degree to which parity-violating (PV) electroexcitation of the Δ(1232) resonance may be used to extract the weak neutral axial vector transition form factors. We find that the axial...
Recoil Order Chiral Corrections to Baryon Octet Axial Currents and Large $N_c$ QCD (2002)
Zhu, Shi-Lin, Sacco, G., Ramsey-Musolf, M. J.
We compute the chiral corrections to octet baryon axial currents through ${\cal O}(p^3)$ in heavy baryon chiral perturbation theory, including both octet and decuplet baryon intermediate states. We...
\Lambda_b Lifetime from the HQET Sum Rule (2001)
Huang, Chao-Shang, Liu, Chun, Zhu, Shi-Lin
The HQET sum rule analysis for the \Lambda_b matrix element of the four-quark operator relevant to its lifetime is reported. Our main conclusion is that the lifetime ratio \tau(\Lambda_b)/\tau(B^0)...
Parity-Violating Photoproduction of π± on the Δ Resonance (2001)
Zhu, Shi-Lin, Maekawa, C. M., Holstein, B. R., Ramsey-Musolf, M. J.
We analyze the real-photon asymmetry Aγ± for the parity-violating (PV) π± production on the Δ resonance via the reactions γ→+p→Δ+→π++n and γ→+d→Δ0+p→π-+p+p. This asymmetry is...
Subleading corrections to parity-violating pion photoproduction (2001)
Zhu, Shi-Lin, Puglia, S., Holstein, B. R., Ramsey-Musolf, M. J.
We compute the photon asymmetry Bγ for near threshold parity-violating (PV) pion photoproduction through subleading order. We show that subleading contributions involve a new combination of PV...
Electroweak Radiative Corrections to Parity-Violating Electroexcitation of the $\Delta$ (2001)
Zhu, Shi-Lin, Maekawa, C. M., Sacco, G., Holstein, B. R., Ramsey-Musolf, M. J.
We analyze the degree to which parity-violating (PV) electroexcitation of the $\Delta(1232)$ resonance may be used to extract the weak neutral axial vector transition form factors. We find that the...
Parity Violating Photoproduction of $\pi^\pm$ on the $\Delta$ Resonance (2001)
Zhu, Shi-Lin, Maekawa, C. M., Holstein, B. R., Ramsey-Musolf, M. J.
We analyze the real photon asymmetry $A^\pm_\gamma$ for the parity violating (PV) $\pi^\pm$ production on the $\Delta$ resonance via the reactions ${\vec \gamma} + p \to \Delta^+ \to \pi^+ + n$ and...
Parity-Violating Photoproduction of pi± on the Delta ResonanceShi-Lin Zhu (2001)
Holstein, B. R., Maekawa, C. M., Ramsey-Musolf, M. J., Zhu, Shi-Lin
Subleading corrections to parity violating pion photoproduction (2000)
Zhu, Shi-Lin, Puglia, S., Holstein, B. R., Ramsey-Musolf, M. J.
We compute the photon asymmetry $B_\gamma$ for near threshold parity violating (PV) pion photoproduction through sub-leading order. We show that sub-leading contributions involve a new combination of...
We extract the matrix elements of four quark operators O_{L,S} relevant to the B_s and \bar B_s life time difference from QCD sum rules. We find the vacuum saturation approximation works reasonably...
$\pi \Delta\Delta$ coupling constant (2000)
We calculate the $\pi \Delta\Delta$ coupling $g_{\pi^0\Delta^{++}\Delta^{++}}$ using light cone QCD sum rule. Our result is $g_{\pi^0\Delta^{++}\Delta^{++}}=(11.8\pm 2.0)$.
Recoil Order Chiral Corrections to Baryon Octet Axial Currents (2000)
Zhu, Shi-Lin, Puglia, S., Ramsey-Musolf, M. J.
We calculate chiral corrections to the octet axial currents through ${\cal O}(p^3)$ using baryon chiral perturbation theory (BCPT). The relativistic BCPT framework allows one to sum an infinite...
Octet Baryon Charge Radii, Chiral Symmetry and Decuplet Intermediate States (2000)
Puglia, S. J., Ramsey-Musolf, M. J., Zhu, Shi-Lin
We compute the octet baryon charge radii to O(1/Heavy^3) in heavy baryon chiral perturbation theory. We examine the effect of including the decuplet of spin-3/2 baryons explicitly. We find that it...
Excited heavy baryon masses in HQET QCD sum rules (2000)
We construct the interpolating currents for the fourteen p-wave excited heavy baryons in the framework of heavy quark effective theory (HQET). At the leading order in the 1/m_Q expansion these...
Chiral Symmetry and the Parity-Violating $NN\pi$ Yukawa Coupling (2000)
Zhu, Shi-Lin, Puglia, S. J., Holstein, B. R., Ramsey-Musolf, M. J.
We construct the complete SU(2) parity-violating (PV) $\pi, N, \Delta$ interaction Lagrangian with one derivative, and calculate the chiral corrections to the PV Yukawa $NN\pi$ coupling constant...
The Nucleon Anapole Moment and Parity-Violating ep Scattering (2000)
Zhu, Shi-Lin, Puglia, S. J., Holstein, B. R., Ramsey-Musolf, M. J.
Parity-violating (PV) interactions among quarks in the nucleon induce a PV $\gamma NN$ coupling, or anapole moment (AM). We compute electroweak gauge-independent contributions to the AM through...
The $\eta NN$ coupling constant (2000)
We derive the light cone QCD sum rule for the $\eta NN$ coupling constant $g_{\eta NN} $. The contribution from the excited states and the continuum is subtracted cleanly through the double Borel...
Strong and electromagnetic decays of p-wave heavy baryons $\Lambda_{c1}, \Lambda^*_{c1}$ (2000)
We first calculate the binding energy, the pionic and electromagnetic couping constants of the lowest lying p-wave heavy baryon doublet $\Lambda_{c1}$, $\Lambda_{c1}^*$ in the leading order of the...
Reanalysis of the Four-Quark Operators Relevant to \Lambda_b Lifetime from QCD Sum Rule (1999)
Huang, Chao-Shang, Liu, Chun, Zhu, Shi-Lin
\Lambda_b matrix element of four-quark operator relevant to its lifetime is reanalyzed by QCD sum rule. The new ingredients introduced are that (1) more vacuum condensates are considered; (2)...
Some decay modes of the $1^{-+}$ hybrid meson in QCD sum rules revisited (1999)
The pionic coupling constants in the decays of the $1^{-+}$ hybrid meson are calculated. The double Borel transformation is invoked and continuum contribution is subtracted. The decay widths of the...
Hybrid quarkonium masses up to the order of ${\cal O}(1/m_Q)$ (1998)
We have calculated the binding energy of the hybrid quarkonium up to the order of ${\cal O}(1/m_Q)$ and found their decay constants scale like $m_Q^{5/4}$ as $m_Q\to \infty$. The $0^{--}$ and...
The masses and decay widths of heavy hybrid mesons (1998)
We first derive the mass sum rules for the heavy hybrid mesons to obtain the binding energy and decay constants in the leading order of HQET. The pionic couplings between the lightest $1^{-+}$ hybrid...
The $K^\ast K\pi$ and $\rho\pi\pi$ couplings in QCD (1998)
The light cone QCD sum rules are derived for the $K^\ast K\pi$ coupling $g_{K^\ast K\pi} $ and the $\rho\pi\pi$ coupling $g_{\rho\pi\pi}$. The contribution from the excited states and the continuum...
We study the effect of $B\pi$ continuum in the QCD sum rule analysis of the heavy meson doublet $(0^+, 1^+)$ in the leading order of heavy quark effective theory. New sum rules are derived for the...
The $\omega NN$ couplings derived from QCD sum rules (1998)
The light cone QCD sum rules are derived for $\omega NN$ vector and tensor couplings simultaneously. The vacuum gluon field contribution is taken into account. Our results are $g_\omega =(18\pm 8),...
The suppression of $\pi N N(1535)$ coupling in QCD (1998)
The light cone QCD sum rules are employed to calculate the $\pi N N(1535)$ coupling $g_{\pi N N^\ast}$. We study the two point correlation function of two nucleon currents sandwiched between the...
Radiative decays of heavy hadrons from light cone QCD sum rules in the leading order of HQET (1998)
The radiative decays of heavy baryons and lowest three doublets of heavy mesons are studied with the light cone QCD sum rules in the leading order of heavy quark effective theory.
The strong $\rho NN$ coupling derived from QCD (1998)
We study the two point correlation function of two nucleon currents sandwiched between the vacuum and the rho meson state. The light cone QCD sum rules are derived both for $\rho NN$ vector and...
The $\pi NN$ and $\pi NN(1535)$ couplings in QCD (1998)
Zhu, Shi-Lin, Hwang, W. -Y. P., Dai, Yuan-Ben
The light cone QCD sum rules are derived for the $\pi NN$ coupling $g_{\pi NN}$ and $\pi NN(1535)$ coupling $g_{\pi NN^\ast}$. The contribution from the excited states and continuum is subtracted...
The possible $\Sigma^0$-$\Lambda$ mixing in QCD sum rules (1998)
Zhu, Shi-Lin, Hwang, W. -Y. P., Yang, Ze-sen
We calculate the on-shell $\Sigma^0$-$\Lambda$ mixing parameter $\theta$ with the method of QCD sum rule. Our result is $\theta (m^2_{\Sigma^0}) =(-)(0.5\pm 0.1)$MeV. The electromagnetic interaction...
The $\Omega$ and $\Sigma^0$-$\Lambda$ transition magnetic moments in QCD sum rules (1998)
Zhu, Shi-Lin, Hwang, W. -Y. P., Yang, Ze-sen
The method of QCD sum rules in the presence of external elctromagnetic fields is used to calculate the $\Omega$ magnetic moment $\mu_{\Omega^-}$ and $\Sigma^0$-$\Lambda$ transition magnetic moment...
An improvement on RPA based on a Boson mapping (1998)
Zhu, Shi-Lin, Zhou, Zhi-ning, Yang, Ze-sen
We use a solvable model to perform modified dyson mapping and reveal the unphysical-state effects in the original Random Phase Approximation (RPA). We then propose a method to introduce the RPA and...
Electromagnetic decays of vector mesons as derived from QCD sum rules (1998)
Zhu, Shi-lin, Hwang, W. -Y. P., Yang, Ze-sen
We apply the method of QCD sum rules in the presence of external electromagnetic fields $F_{\mu\nu}$ to the problem of the electromagnetic decays of various vector mesons, such as $\rho\to\pi\gamma$,...
Decay widths of B_1 and B^*_2 up to the order of O(1/m_Q) in HQET (1998)
We first improve the previous results on the masses of the doublets (0^+,1^+) and (1^+,2^+) with QCD sum rules up to the order of O(1/m_Q) in the framework of HQET and calculate the O(1/m_Q)...
The couplings and decay widths of the proceses (1^+,2^+)->(0^-,1^-)+rho are studied with ligh-cone QCD sum rules in the leading order of heavy quark effective theory. These processes are employed to...
The couplings of pions with heavy baryons g_2 (\Sigma^*, \Sigma) and g_3(\Sigma^*, \Lambda) are studied with light-cone QCD sum rules in the leading order of heavy quark effective theory. Both sum...
The couplings of pions with lowest three doublets (0^-,1^-), (0^+,1^+) and (1^+,2^+) of heavy mesons are studied with ligh cone QCD sum rules in the leading order of heavy quark effective theory. The...
The Sigma_c and Lamda_c magnetic moments from QCD spectral sum rules (1997)
Zhu, Shi-Lin, Yang, Ze-Sen, Hwang, W-Y. P.
We use QCD spectral sum rules to extract the Sigma_c and Lambda_c magnetic moments. The elctromagnetic field is treated as the external field. We adopt the value of the susceptibility chi=-4.5...
The electromagnetic effects in isospin symmetry breakings of q{\bar q} systems (1997)
The isospin symmetry breakings of q{\bar q} are investigated in the QCD sum rule method. The electromagnetic effects are evaluated following the procedure requiring that the electromagnetic effects...
(D* to D + gamma) and (B* to B + gamma) as derived from QCD Sum Rules (1996)
Zhu, Shi-lin, Hwang, W-Y. P., Yang, Ze-sen
The method of QCD sum rules in the presence of the external electromagnetic $F_{\mu\nu}$ field is used to analyze radiative decays of charmed or bottomed mesons such as $D^{\ast}\to D\gamma$ and...
QCD Sum Rules: Isospin Symmetry Breakings in Pion-Nucleon Couplings (1996)
Hwang, W-Y. P., Yang, Ze-sen, Zhong, Y. S., Zhou, Z. N., Zhu, Shi-lin
We use the method of QCD sum rules in the presence of an external pion field to investigate isospin symmetry breakings in pion-nucleon couplings. Possible manifestations of such isospin symmetry...