Article
Astronomy & Astrophysics
P. C. Bruns, A. Cieply, M. Mai
Summary: This study adopts a novel formalism to analyze the low-energy gamma p -> K+ pi Sigma photoproduction reaction. The meson-baryon rescattering is found to have a significant impact on the generated spectra, and is compared with experimental data.
Article
Astronomy & Astrophysics
Pan -Pan Shi, Feng-Kun Guo, Zhi Yang
Summary: The semi-inclusive electroproduction of exotic hadrons, including the Tcc, Pcs, and hidden-charm baryon-antibaryon states, is explored under the assumption that they are S-wave hadronic molecules of a pair of charmed hadrons. The results indicate that a larger number of Pcs states and ?c over bar ?c molecules can be produced at proposed electron-ion colliders in China (EicC) and the US (EIC). The Tcc states and other hidden-charm baryon-antibaryon states can also be searched for at EIC. The 24-GeV upgrade of the Continuous Beam Accelerator Facility at the Thomas Jefferson National Accelerator Facility can play an important role in the search for hidden-charm tetraquark and pentaquark states due to its high luminosity.
Article
Physics, Particles & Fields
Xu Cao, Jian-Ping Dai, Zhi Yang
Summary: The BESIII collaboration recently discovered a charged strange hidden-charm state Zcs(3985) in the Ds-D0+Ds-D0 spectrum. They studied the photoproduction of these exotic states and found that the maximal photoproduction cross section of the strange partner is around 1-2 orders of magnitude smaller than that of the corresponding non-strange states. The possibility of searching for them in future electron-ion colliders (EIC) is briefly discussed.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Jesse F. Giron, Richard F. Lebed, Steven R. Martinez
Summary: The observation of states with hidden charm and open strangeness provides new opportunities for the development of a global model of heavy-quark exotics. The mass splitting between different states implies substantial SU(3) flavor mixing, while the average mass compared to other sectors offers insight into flavor octet-singlet mixing among exotics. The effects of eta-like exchanges are found to be limited, and certain pentaquarks fit well within the model.
Article
Astronomy & Astrophysics
Ulas Ozdem
Summary: The magnetic moments of vector hidden-charmed tetraquark states are determined using light-cone sum rules, and their consistency can be checked by various methods. The magnetic moments of hadrons provide useful knowledge about their geometrical shapes.
Article
Astronomy & Astrophysics
S. Aikawa, S. Ajimura, T. Akaishi, H. Asano, G. Beer, C. Berucci, M. Bragadireanu, P. Buehler, L. Busso, M. Cargnelli, S. Choi, C. Curceanu, S. Enomoto, H. Fujioka, Y. Fujiwara, T. Fukuda, C. Guaraldo, T. Hashimoto, R. S. Hayano, T. Hiraiwa, M. Iio, M. Iliescu, K. Inoue, Y. Ishiguro, S. Ishimoto, T. Ishikawa, K. Itahashi, M. Iwai, M. Iwasaki, K. Kanno, K. Kato, Y. Kato, S. Kawasaki, P. Kienle, Y. Komatsu, H. Kou, Y. Ma, J. Marton, Y. Matsuda, Y. Mizoi, O. Morra, R. Murayama, T. Nagae, H. Noumi, H. Ohnishi, S. Okada, Z. Omar, H. Outa, K. Piscicchia, Y. Sada, A. Sakaguchi, F. Sakuma, M. Sato, A. Scordo, M. Sekimoto, H. Shi, K. Shirotori, D. Sirghi, F. Sirghi, K. Suzuki, S. Suzuki, T. Suzuki, K. Tanida, H. Tatsuno, A. O. Tokiyasu, M. Tokuda, D. Tomono, A. Toyoda, K. Tsukada, O. Vazquez-Doce, E. Widmann, T. Yamaga, T. Yamazaki, H. Yim, Q. Zhang, J. Zmeskal
Summary: In this study, we measured the invariant mass spectra of pi(+/-)Sigma(-/+), pi(0)Sigma(0), and pi(-)Sigma(0) below and above the (K) over bar N mass threshold in K-induced reactions on deuteron. The experimentally observed pi Sigma mass spectral shape is well reproduced by a two-step mechanism involving the knock-out of a neutron from a deuteron by an incident K- at a forward angle, followed by the backward recoil of the (K) over bar and its reaction with the residual nucleon to produce pi and Sigma. By analyzing the data, we determined the S-wave (K) over bar N -> pi Sigma and (K) over bar N -> (K) over bar N scattering amplitudes in the isospin 0 channel, from which we found that the resonance pole corresponding to Lambda(1405) is located closer to the (K) over bar N mass threshold compared to the value determined by the Particle Data Group.
Article
Astronomy & Astrophysics
Cai Cheng, Feng Yang, Yin Huang
Summary: The study investigates the possibility of probing the hidden charm pentaquark state P-cs(4459) through photon-induced reactions on a proton target using an effective Lagrangian approach. Different production mechanisms are considered and calculations show that the P-cs(4459) can be interpreted as a molecule composed of over bar D*Ec. Cross-section calculations for various processes indicate discrepancies between assuming P-cs(4459) as a compact pentaquark and as a molecule of over bar D*Ec. These results can be tested in future experiments, such as the Electron-Ion Collider in China and the United States, to further understand the nature of P-cs.
Article
Physics, Particles & Fields
Jin-Bao Wang, Gang Li, Chun-Sheng An, Cheng-Rong Deng, Ju-Jun Xie
Summary: In this study, the spectrum of low-lying hidden- and double-charm tetraquark states is investigated using a nonrelativistic quark potential model. The instanton-induced interaction is considered as the residual spin-dependent hyperfine interaction between quarks. The numerical results show that the masses of several tetraquark states studied are close to those of experimentally observed candidates of exotic meson, suggesting the presence of corresponding compact tetraquark components in those observed states.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Qi Wu, Yan-Ke Chen, Gang Li, Shi-Dong Liu, Dian-Yong Chen
Summary: In this study, the production of molecular states composed of D-s(()*()) (D) over bar (()(s)*()) and D-s(()*()) (D) over bar (()(s)*()) in B and Bs decays is investigated using an effective Lagrangian approach. The branching ratios are estimated in terms of the model parameter alpha and the binding energy Delta E. The results show that the branching fractions are of the order of 10(-4) and the relative ratios are weakly dependent on the model parameter alpha and the binding energy Delta E. The predicted ratios are useful for the search of hidden-charm molecular states with strange quarks in future experiments at Belle II and LHCb.
Article
Astronomy & Astrophysics
Qi Wu, Dian-Yong Chen
Summary: The study reveals that the main decay mode of Z(cs)(-) (3985) is open charm channel, while the branching ratio of hidden charm decay channels is around 20%, with the predicted branching ratios of Z(cs)(-) -> J/psi K- and Z(cs)(-) -> eta K-c*(-) expected to be around 10%.
Article
Astronomy & Astrophysics
Tian-Wei Wu, Ming-Zhu Liu, Li-Sheng Geng
Summary: The study shows that the D(D) over barK and D(D) over bar *K systems can bind to form exotic hadrons, and can decay into different channels, providing a significant impact on verifying the properties of various exotic hadrons.
Article
Physics, Nuclear
S. Marri, M. N. Nasrabadi, S. Z. Kalantari
Summary: Three-body calculations were performed for the K (K) over barN system with quantum numbers I = 1/2, J(pi) = (1/2)(+). Different types of (K) over barN-pi Sigma potentials were used based on a phenomenological and chiral SU(3) approach. The study showed the mass of the Lambda(1405) resonance to be approximately 1417 MeV/c(2) through chi(2) fitting.
Article
Physics, Particles & Fields
Zhong-Yu Wang, Hiwa A. Ahmed, C. W. Xiao
Summary: By studying the nature of two poles for the Λ(1405) state, it was found that one pole is a pure (K) over barN molecule, while the other is a composite state mainly composed of pi Sigma. This suggests that the Λ(1405) state may overlap with two different states of the same quantum numbers.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Xinmei Zhu, Yuheng Wu, Hongxia Huang, Jialun Ping, Youchang Yang
Summary: Inspired by the observation of hidden-charm pentaquarks, a calculation of the J/ψp scattering cross-section was performed using a specific model. The results indicate the identification of certain pentaquarks as hidden-charm molecular states. Moreover, the calculation was extended to explore hidden-bottom pentaquarks, revealing several heavy pentaquarks for further investigation in future experiments.
Article
Physics, Particles & Fields
Rui Chen
Summary: The study further examines the two-body strong decay behavior of P-cs(4459) in the meson-baryon molecular scenario and supports its identity as a strange hidden-charm Xi D-c* molecule. The relative decay ratio between Λ D-c(s)* and J/psi Λ is around 10, with a partial decay width for the Λ D-c(s)* channel ranging from 0.6 to 2.0 MeV.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Hao-Nan Wang, Li-Sheng Geng, Qian Wang, Ju-Jun Xie
Summary: We study the decays of B-0 -> (KX)-X-0 (3872) and B+ -> K+X(3872) using the X(3872) resonance coupled to the D (D) over bar* + c.c channel. Besides the short-distance interaction mechanism, we also consider the long-distance rescattering diagrams of D (D) over bar*. The difference in mass thresholds and the narrow width of X(3872) at the X(3872) mass lead to significant differences in the loop functions of D (D) over bar*(0) and D+ (D) over bar*-. Taking this into account, we naturally obtain a ratio of B[B-0 -> K-0 X(3872)]/B[B+ -> K+X (3872)] similar to 0.5. Based on this result, we evaluate the decay widths of B-s(0) -> eta(eta')X(3872). Future experimental measurements of these decays are expected to provide insight into the nature of the X(3872) resonance.
CHINESE PHYSICS LETTERS
(2023)
Article
Physics, Nuclear
Yun-He Lyu, Han Zhang, Neng-Chang Wei, Bai-Cian Ke, En Wang, Ju-Jun Xie
Summary: In this study, we perform a theoretical investigation on the photo-production of the Sigma(*)(1/2-) state using the Regge-effective Lagrangian approach. We consider the coupling of Sigma(*)(1/2-) to the t-channel K exchange diagram and calculate the contributions from various channels, including t-channel exchange, s-channel nucleon pole, u-channel Sigma exchange, and contact term. With our model parameters, we predict the differential and total cross sections of the process gamma n -> K+ Sigma(*)(1/2-). This research provides valuable insights for future experimental searches for the Sigma(*)(1/2-) state.
Article
Physics, Nuclear
Hui-Hua Zhong, Ru-Hui Ni, Mu-Yang Chen, Xian-Hui Zhong, Ju-Jun Xie
Summary: In this study, the two-body strong decays of the low-lying Omega baryon states were analyzed using a chiral quark model. It was found that the quark model could accurately reproduce the mass, total width, and two-body decay Omega(2012) -> (K) over bar Xi. Furthermore, the three-body strong decay Omega*|1P(3/2)-> -> Xi*(1530)(K) over bar -> Xi pi(K) over bar was investigated, and it was found that the predicted ratio R-Xi(K) over bar(Xi pi(K) over bar) was close to the upper limit measured by Belle Collaboration in 2019. However, it was still much smaller compared to recent measurements. The coupled-channel effects on the decay process and the nature of the Omega(2012) resonance were also studied. Evaluation: 7 points
Article
Physics, Particles & Fields
Qian Wu, Chengdong Han, Di Qing, Wei Kou, Xurong Chen, Fan Wang, Ju-Jun Xie
Summary: In this study, the valence quark distribution functions of the pi meson were calculated using the non-relativistic chiral constituent quark model. The pi wave function was obtained by solving the two-body Schrodinger equation and then transformed into the light cone frame. The calculated results are consistent with experimental data, and the structure functions of the pi meson were also calculated.
Article
Astronomy & Astrophysics
Qing-Hua Shen, Ju-Jun Xie
Summary: The three-body eta K* over bar K*, pi K* over bar K*, and KK* over bar K* systems are investigated using the fixed-center approximation to the Faddeev equations, where K* over bar K* is considered as the scalar meson f0(1710). The interactions between pi, eta, K, and K* are determined based on the chiral unitary approach. Based on the scattering of the eta meson on the clusterized (K* over bar K*)f0(1710) system, a peak is observed in the three-body scattering amplitude modulus, which is associated with a bound state with quantum numbers IG(JPC) = 0+(0-+). The mass and width of this state are estimated to be around 2054 and 60 MeV, respectively. The theoretical predictions presented in this study can be tested by future experimental measurements conducted by the BESIII, BelleII, and LHCb Collaborations.
Article
Physics, Particles & Fields
Xiao-Yun Wang, Zu-Xin Cai, Gang Li, Shi-Dong Liu, Chun-Sheng An, Ju-Jun Xie
Summary: We investigated the process upsilon(5S , 6S) -> X-gamma(b), assuming Xb to be a molecular state of B B & macr;*. Two types of meson loops, B(*)B & macr;(*) and B1B & macr;(*), were considered. To explore the rescattering mechanism, we calculated the relevant branching ratios using an effective Lagrangian based on heavy quark symmetry. The branching ratios for upsilon(5S , 6S) -> X-gamma(b) were found to be in the orders of 10(-7) to 10(-6). These significant branching ratios might be observed at BelleII, providing important insights into the inner structures of the exotic state Xb.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Nuclear
Jing-Feng Li, Cheng Chen, Gang Li, Chun-Sheng An, Cheng-Rong Deng, Ju-Jun Xie
Summary: In this study, the quark orbital angular momentum of the ground octet baryons is investigated using an extended chiral constituent quark model. The baryon wave functions are taken as a superposition of the traditional qqq and the qqqqq over bar higher Fock components. The coupling between the two configurations is estimated using the 3P0 quark-antiquark creation mechanism, and the coupling strength is determined by fitting the sea flavor asymmetry of the nucleon. The numerical results show that the quark angular momentum of the nucleon, E, A, and E hyperons range from 0.10-0.30. Additionally, the quark angular momentum of all hyperons is slightly smaller than that of the nucleon. The intrinsic quark orbital angular momentum can account for up to 60% of the spin fractions of the octet baryons in the present model.
Article
Astronomy & Astrophysics
Xin Zhu, Hao-Nan Wang, De-Min Li, En Wang, Li-Sheng Geng, Ju-Jun Xie
Summary: Recently, the BESIII Collaboration observed the scalar meson a0(1710)+ in the K+K0S invariant mass spectrum in the D+s -> pi 0K+K0S decay. They performed a theoretical study of a0(1710)+ in the process D+s -> pi 0a0(1710)+-> pi 0K+K0S and considered the contributions of K* and a0(980). The study supported the molecular K* over bar K* nature of the scalar a0(1710) resonance, as the recent BESIII experimental measurements can be well reproduced.
Article
Physics, Particles & Fields
Jie Zhang, Jin-Bao Wang, Gang Li, Chun-Sheng An, Cheng-Rong Deng, Ju-Jun Xie
Summary: This study systematically investigates the fully heavy tetraquark states using a nonrelativistic constituent quark model, taking into account the instanton-induced and one-gluon exchange interactions. The results show the existence of specific states at certain energy ranges. It suggests that the newly observed X(6900) state by LHCb may be an excited state, while the reported X(6600) state by CMS and ATLAS may be a ground state tetraquark.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Xiao-Yun Wang, Gang Li, Chun-Sheng An, Ju-Jun Xie
Summary: In this study, we investigate the radiative decays of Z(c)(3900)/Z(c)(4020) to γ χ(cJ)(γ χ'(cJ)) (J=0,1,2), assuming a strong coupling between Z(c)(3900) and D(D)over bar*+c.c and Z(c)(4020) and D*(D)over bar* channels. By considering the contributions of intermediate charmed mesons triangle loops within an effective Lagrangian approach, we calculate the partial widths of these decays. The results show that the partial widths of Z(c)(3900)->γ χ(cJ) are a few hundred keVs, while the partial widths of Z(c)(4020)->γ χ(cJ) are tens of keVs. The predicted partial widths of Z(c)(3900)->γ χ'(c0,1) are less than 1 keV, mainly due to the small phase space. The calculated partial widths of Z(c)(4020)->γ χ'(c0,2) are usually smaller than 1 keV. For the Z(c)(4020)->γ χ'(c1) process, the obtained partial widths can reach up to the order of 10 keV. Additionally, we also investigate the dependence of these ratios between different decay modes on the masses of Z(c)(3900) or Z(c)(4020), which can be useful for experimental measurements. These calculations can be tested in future experiments.
Article
Astronomy & Astrophysics
Guan-Ying Wang, Neng-Chang Wei, Hui-Min Yang, En Wang, Li-Sheng Geng, Ju-Jun Xie
Summary: Recently, the Belle Collaboration has measured the lambda(+)(c) -> eta lambda pi(+ )decay and observed clear signals of the resonances A(1670) and E(1385). By reanalyzing the process and considering the S-wave eta A and eta pi+ final state interactions, researchers have obtained results that are consistent with the experimental measurements.
Article
Physics, Particles & Fields
Jin-Bao Wang, Gang Li, Chun-Sheng An, Cheng-Rong Deng, Ju-Jun Xie
Summary: In this study, the spectrum of low-lying hidden- and double-charm tetraquark states is investigated using a nonrelativistic quark potential model. The instanton-induced interaction is considered as the residual spin-dependent hyperfine interaction between quarks. The numerical results show that the masses of several tetraquark states studied are close to those of experimentally observed candidates of exotic meson, suggesting the presence of corresponding compact tetraquark components in those observed states.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Xiang Wei, Qing-Hua Shen, Ju-Jun Xie
Summary: This theoretical study investigates the D (D) over barK three body system using the fixed center approximation and the chiral unitary approach. The study finds a resonance structure in the three body K-(D (D) over bar)(X(3720)) scattering amplitude, supporting the formation of a D (D) over barK bound state.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Xin Zhu, De-Min Li, En Wang, Li-Sheng Geng, Ju-Jun Xie
Summary: This study presents a theoretical analysis of a(0)(1710), which is the isovector partner of f(0)(1710), in the process D-s(+) pi(+)-+(KSKS0)-K-0. The authors investigate the weak interaction part through the charm quark decay process and the hadronization part through different mechanisms. The results provide valuable insights into the nature of scalar f(0)(1710) and its isovector partner a(0)(1710).
Article
Physics, Nuclear
Rui Qi, Jin-Bao Wang, Gang Li, Chun-Sheng An, Cheng-Rong Deng, Ju-Jun Xie
Summary: In this study, the axial charges of octet baryons were investigated using the extended chiral constituent quark model, taking into account all possible five-quark components. The numerical results were comparable to predictions from other theoretical approaches. Additionally, it was found that the light quark spins Delta u and Delta d in the Lambda baryon were of small but negative values, which were absent in the traditional three-quark model.
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.
