ORCID Profile
0000-0003-4583-7691
Current Organisation
University of the Chinese Academy of Sciences
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Publisher: IOP Publishing
Date: 12-11-2018
Publisher: IOP Publishing
Date: 08-2022
Abstract: Analytical formulae for the phase space factors and three-momenta of three- and four-body final states are derived for all sets of independent kinematic variables containing invariant mass variables. These formulae will help experimental physicists to perform data analysis. As an ex le, we show how to use these formulae to distinguish the different mechanisms of the process when searching the signals of states in the energy region of the Electron–Ion collider at China (EicC).
Publisher: MDPI AG
Date: 28-09-2020
DOI: 10.3390/SYM12101611
Abstract: We analyze possible singularities in the J/ψΛ invariant mass distribution of the Ξb−→K−J/ψΛ process via triangle loop diagrams. Triangle singularities in the physical region are found in 18 different triangle loop diagrams. Among those with Ξ*-charmonium-Λ intermediate states, the one from the χc1Ξ(2120)Λ loop, which is located around 4628 MeV, is found the most likely to cause observable effects. One needs S- and P-waves in χc1Λ and J/ψΛ systems, respectively, when the quantum numbers of these systems are 1/2+ or 3/2+. When the quantum numbers of the Ξ(2120) are JP=1/2+, 1/2− or 3/2+, the peak structure should be sharper than the other JP choices. This suggests that although the whole strength is unknown, we should pay attention to the contributions from the Ξ*-charmonium-Λ triangle diagram if structures are observed in the J/ψΛ invariant mass spectrum experimentally. In addition, a few triangle diagrams with the Ds1*(2700) as one of the intermediate particles can also produce singularities in the J/ψΛ distribution, but at higher energies above 4.9 GeV.
Publisher: AIP
Date: 2010
DOI: 10.1063/1.3483390
Publisher: Springer Science and Business Media LLC
Date: 09-06-2016
Publisher: Elsevier BV
Date: 04-2014
Publisher: American Physical Society (APS)
Date: 22-04-2022
Publisher: Sissa Medialab
Date: 04-05-2017
DOI: 10.22323/1.281.0288
Publisher: AIP
Date: 2012
DOI: 10.1063/1.3701238
Publisher: American Physical Society (APS)
Date: 28-11-2022
Publisher: WORLD SCIENTIFIC
Date: 08-2020
Publisher: Elsevier BV
Date: 03-0008
Publisher: American Physical Society (APS)
Date: 19-06-2017
Publisher: EDP Sciences
Date: 2018
DOI: 10.1051/EPJCONF/201817505024
Abstract: An extended multi-hadron operator is developed to extract the spectra of irreducible representations in the finite volume. The irreducible representations of the cubic group are projected using a coordinate-space operator. The correlation function of this operator is computationally effcient to extract lattice spectra. In particular, this new formulation only requires propagator inversions from two distinct locations, at fixed physical separation. We perform a proof-of-principle study on a 24 3 × 48 lattice volume with m π ≈ 900 MeV by isolating the spectra of A + 1 , E + and T + 2 of the ππ system with isospin-2 in the rest frame.
Publisher: IOP Publishing
Date: 08-2020
DOI: 10.1088/1674-1137/44/8/084102
Abstract: In this study, we analyze the electroproduction of the LHCb pentaquark states with the assumption that they are resonant states. Our main concern is to investigate the final state distribution in the phase space to extract a feeble pentaquark signal from a large non-resonant background. The results indicate that the signal to background ratio will increase significantly with a proper kinematic cut, which will be beneficial for future experimental analysis.
Publisher: American Physical Society (APS)
Date: 15-06-2018
Publisher: American Physical Society (APS)
Date: 24-07-2009
Publisher: Elsevier BV
Date: 09-2020
Publisher: Journal of the Physical Society of Japan
Date: 23-05-2016
Publisher: American Physical Society (APS)
Date: 26-05-2011
Publisher: American Physical Society (APS)
Date: 04-12-2012
Publisher: Springer Science and Business Media LLC
Date: 02-2022
Abstract: A three-particle quantization condition on the lattice is written down in a manifestly relativistic-invariant form by using a generalization of the non-relativistic effective field theory (NREFT) approach. Inclusion of the higher partial waves is explicitly addressed. A partial diagonalization of the quantization condition into the various irreducible representations of the (little groups of the) octahedral group has been carried out both in the center-of-mass frame and in moving frames. Furthermore, producing synthetic data in a toy model, the relativistic invariance is explicitly demonstrated for the three-body bound state spectrum.
Publisher: American Physical Society (APS)
Date: 17-07-2013
Publisher: American Physical Society (APS)
Date: 30-04-2010
Publisher: American Physical Society (APS)
Date: 24-01-2017
Publisher: Elsevier BV
Date: 03-2023
Publisher: American Physical Society (APS)
Date: 14-07-2023
Publisher: Springer Science and Business Media LLC
Date: 07-2022
Abstract: Using effective-range expansion for the two-body litudes may generate spurious sub-threshold poles outside of the convergence range of the expansion. In the infinite volume, the emergence of such poles leads to the inconsistencies in the three-body equations, e.g., to the breakdown of unitarity. We investigate the effect of the spurious poles on the three-body quantization condition in a finite volume and show that it leads to a peculiar dependence of the energy levels on the box size L . Furthermore, within a simple model, it is demonstrated that the procedure for the removal of these poles, which was recently proposed in ref. [1] in the infinite volume, can be adapted to the finite-volume calculations. The structure of the exact energy levels is reproduced with an accuracy that systematically improves order by order in the EFT expansion.
Publisher: American Physical Society (APS)
Date: 26-02-2016
Publisher: American Physical Society (APS)
Date: 29-04-2019
Publisher: American Physical Society (APS)
Date: 17-04-2012
Publisher: IOP Publishing
Date: 06-2020
DOI: 10.1088/1674-1137/44/6/063102
Abstract: Using the latest PandaX limits on the light dark matter (DM) with a light mediator, we check their implication on the parameter space of the general singlet extension of MSSM (without Z 3 symmetry), which can have a sufficient DM self-interaction to solve the small-scale structure problem. We find that the PandaX limits can tightly constrain the parameter space, depending on the coupling λ between the singlet and doublet Higgs fields. For the singlet extension of MSSM with Z 3 symmetry, the so-called NMSSM, we also demonstrate the PandaX constraints on its parameter space, which gives a light DM with the correct relic density but without sufficient self-interaction to solve the small-scale structure problem. We find that in NMSSM, the GeV dark matter with a sub-GeV mediator is tightly constrained.
Publisher: Springer Science and Business Media LLC
Date: 22-02-2023
Abstract: A manifestly relativistic-invariant Lellouch-Lüscher formalism for the decays into three identical particles with no two-to-three transitions is proposed. Similarly to [1], the formalism is based on the use of the non-relativistic effective Lagrangians. Manifest Lorentz invariance is guaranteed, as in [2], by choosing the quantization axis along the total four-momentum of the three-particle system. A systematic inclusion of the higher-order derivative couplings, as well as higher partial waves is addressed.
Publisher: IOP Publishing
Date: 06-2021
DOI: 10.1088/1748-0221/16/06/P06038
Abstract: We present the characterization of a readout Application-Specific Integrated Circuit (ASIC) for the CMS Endcap Timing Layer (ETL) of the High-Luminosity LHC upgrade with charge injection. The ASIC, named ETROC and developed in a 65 nm CMOS technology, reads out a 16× 16 pixel matrix of the Low-Gain Avalanche Detector (LGAD). The jitter contribution from ETROC is required to be below 40 ps to achieve the 50 ps overall time resolution per hit. The analog readout circuits in ETROC consist of the pre lifier and the discriminator. The pre lifier handles the LGAD charge signal with the most probable value of around 15 fC. The discriminator generates the digital pulse, which provides the Time-Of-Arrival (TOA, leading edge) and Time-Over-Threshold (TOT, pulse width) information. The prototype of ETROC (ETROC0) that implements a single channel of analog readout circuits has been evaluated with charge injection. The jitter of the analog readout circuits, measured from the discriminator's leading edge, is better than 16 ps for a charge larger than 15 fC with the sensor capacitance. The time walk resulting from different pulse heights can be corrected using the TOT measurement. The time resolution distribution has a standard deviation of 29 ps after the time-walk correction from the charge injection. At room temperature, the pre lifier's power consumption is measured to be 0.74 mW and 1.53 mW per pixel in the low- and high-power mode, respectively. The measured power consumption of the discriminator is 0.84 mW per pixel. With the ASIC alone or the LGAD sensor, The characterization performances fulfill the ETL's challenging requirements.
Publisher: Springer Science and Business Media LLC
Date: 13-01-2023
Abstract: Combining the quark model, the quark-pair-creation mechanism and B (*) $$ \\overline{K} $$ K ¯ interaction, we have investigated the near-threshold P -wave B s states in the framework of the Hamiltonian effective field theory. With the heavy quark flavor symmetry, all the parameters are determined in the D s sector by fitting the lattice data. The masses of the bottom-strange partners of the $$ {D}_{s0}^{\\ast }(2317) $$ D s 0 ∗ 2317 and $$ {D}_{s1}^{\\ast }(2460) $$ D s 1 ∗ 2460 are predicted to be $$ {M}_{B_{s0}^{\\ast }}={5730.2}_{-1.5}^{+2.4} $$ M B s 0 ∗ = 5730.2 − 1.5 + 2.4 MeV and $$ {M}_{B_{s1}^{\\ast }}={5769.6}_{-1.6}^{+2.4} $$ M B s 1 ∗ = 5769.6 − 1.6 + 2.4 MeV, respectively, which are well consistent with the lattice QCD component. The two P -wave B s states are the mixtures of the bare $$ \\overline{b}s $$ b ¯ s core and B (*) $$ \\overline{K} $$ K ¯ component. Moreover, we find a crossing point between the energy levels with and without the interaction Hamiltonian in the finite volume spectrum in the 0 + case, which corresponds to a CDD (Castillejo-Dalitz-Dyson) zero in the T -matrix of the $$ B\\overline{K} $$ B K ¯ scattering. This CDD zero will help deepen the insights of the near-threshold states and can be examined by future lattice calculation.
Publisher: American Physical Society (APS)
Date: 12-08-2022
Publisher: World Scientific Pub Co Pte Lt
Date: 11-2012
DOI: 10.1142/S0218301312300111
Abstract: After some short introductory remarks on particular issues on the vector mesons in nuclei, in this paper, we present a short review of recent developments concerning the interaction of vector mesons with baryons and with nuclei from a modern perspective using the local hidden gauge formalism for the interaction of vector mesons. We present results for the vector–baryon interaction and in particular for the resonances which appear as composite states, dynamically generated from the interaction of vector mesons with baryons, taking also the mixing of these states with pseudoscalars and baryons into account. We then venture into the charm sector, reporting on hidden charm baryon states around 4400 MeV, generated from the interaction of vector mesons and baryons with charm, which have a strong repercussion on the properties of the J/ΨN interaction. We also address the interaction of K* with nuclei and make suggestions to measure the predicted huge width in the medium by means of transparency ratio. The formalism is extended to study the phenomenon of J/ψ suppression in nuclei via J/ψ photo-production reactions.
Publisher: IOP Publishing
Date: 09-2010
Publisher: American Physical Society (APS)
Date: 14-05-2010
Publisher: No publisher found
Date: 2014
Publisher: American Physical Society (APS)
Date: 15-09-2021
Publisher: Sociedad Mexicana de Fisica A C
Date: 11-06-2022
DOI: 10.31349/SUPLREVMEXFIS.3.0308045
Abstract: The LHCb collaboration reported recently a charm-strange pentaquark state Pcs(4459) found in the J/ψΛ invariant mass distribution. Using a coupled channel unitary approach combined with the local hidden gauge formalism, we investigate the D¯(∗)Ξ (∗,0) c interactions, together with the J/ψΛ and other coupled channels, with the constraints of the heavy quark spin symmetry. We dynamically reproduce the Pcs(4459) state in the coupled channel interactions, which is a degenerate state of D¯ ∗Ξc and analogous to the Pc(4450) state before. Furthermore, we make more predictions for future experiments.
Publisher: American Physical Society (APS)
Date: 06-07-2011
Publisher: Springer Science and Business Media LLC
Date: 10-04-2015
Publisher: American Physical Society (APS)
Date: 16-10-2008
Publisher: American Physical Society (APS)
Date: 02-06-2020
Publisher: IOP Publishing
Date: 12-2020
Abstract: Weakly bound states often occur in nuclear physics. To precisely understand their properties, the coupling to the continuum should be worked out explicitly. As the first step, we use a simple nuclear model in the continuum and on a lattice to investigate the influence of a third particle on a loosely bound state of a particle and a heavy core. Our approach is consistent with the Lüscher formalism.
Publisher: American Physical Society (APS)
Date: 13-11-2014
Publisher: Springer Science and Business Media LLC
Date: 08-06-2023
Abstract: In hadron spectrum physics, the partial wave analysis is a primary method used to extract properties of hadronic resonances. The covariant orbital-spin coupling scheme holds unique advantages over other partial wave methods due to its Lorentz covariant form and determined orbital-spin quantum numbers. This paper presents a general form of the covariant orbital-spin coupling scheme based on the irreducible tensor of the homogeneous proper Lorentz group and its little groups. A systematic procedure for constructing partial wave litude in a Lorentz covariant way is provided, which can be applied to both massive and massless particles. Specific ex les are also included.
Publisher: American Physical Society (APS)
Date: 25-05-2023
Publisher: American Physical Society (APS)
Date: 22-02-2012
Publisher: World Scientific Pub Co Pte Lt
Date: 2011
DOI: 10.1142/S2010194511000729
Abstract: In this talk we review the vector-vector and vector-baryon interaction within the hidden gauge formalism in a coupled channel unitary approach. The vector-vector interaction is studied for all the sectors not studied before: C = 0 S = 1 (hidden-charm), C = 1, S = 1, and the flavor exotic sectors C = 1 S = -1, 2 and C = 2 S = 0, 1, 2. We find nine states, four of them in the C = 1 S = 1 sector, where one can be identified with the [Formula: see text] and it is interpreted as a D* K* molecular state. The other five resonances are found in the flavor exotic sectors C = 1 S = -1, C = 2 S = 0, 1 and can be considered as [Formula: see text], D* D* and [Formula: see text] molecular states. In the case of the vector-baryon interaction we generate hidden charm resonances around 4.3 GeV, without or with strangeness, N*, Λ*. Nevertheless, there is not experimental evidence of such states yet.
Publisher: American Physical Society (APS)
Date: 29-05-2018
Publisher: American Physical Society (APS)
Date: 23-09-2019
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3647202
Publisher: American Physical Society (APS)
Date: 09-03-2015
Publisher: American Physical Society (APS)
Date: 14-03-2022
Publisher: EDP Sciences
Date: 2014
Publisher: EDP Sciences
Date: 2018
DOI: 10.1051/EPJCONF/201817506019
Abstract: The structure of the ground state nucleon and its finite-volume excitations are examined from three different perspectives. Using new techniques to extract the relativistic components of the nucleon wave function, the node structure of both the upper and lower components of the nucleon wave function are illustrated. A non-trivial role for gluonic components is manifest. In the second approach, the parity-expanded variational analysis (PEVA) technique is utilised to isolate states at finite momenta, enabling a novel examination of the electric and magnetic form factors of nucleon excitations. Here the magnetic form factors of low-lying odd-parity nucleons are particularly interesting. Finally, the structure of the nucleon spectrum is examined in a Hamiltonian effective field theory analysis incorporating recent lattice-QCD determinations of low-lying two-particle scattering-state energies in the finite volume. The Roper resonance of Nature is observed to originate from multi-particle coupled-channel interactions while the first radial excitation of the nucleon sits much higher at approximately 1.9 GeV.
Publisher: Sissa Medialab
Date: 02-03-2022
DOI: 10.22323/1.380.0174
Publisher: American Physical Society (APS)
Date: 11-12-2012
Publisher: American Physical Society (APS)
Date: 11-09-2019
Publisher: American Physical Society (APS)
Date: 23-12-2020
Publisher: American Physical Society (APS)
Date: 27-02-2017
Publisher: American Physical Society (APS)
Date: 10-04-2020
Publisher: American Physical Society (APS)
Date: 22-04-2022
Publisher: Journal of the Physical Society of Japan
Date: 23-05-2016
Publisher: IOP Publishing
Date: 06-2010
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3647418
Publisher: American Physical Society (APS)
Date: 26-06-2007
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3647414
Publisher: American Physical Society (APS)
Date: 22-10-2009
Publisher: Sissa Medialab
Date: 05-12-2019
DOI: 10.22323/1.363.0002
Publisher: American Physical Society (APS)
Date: 28-06-2022
Publisher: American Physical Society (APS)
Date: 24-05-2021
Publisher: American Physical Society (APS)
Date: 03-12-2021
Publisher: American Physical Society (APS)
Date: 28-01-2013
Publisher: Elsevier BV
Date: 04-2023
Publisher: American Physical Society (APS)
Date: 29-11-2010
Publisher: Journal of the Physical Society of Japan
Date: 23-05-2016
Publisher: American Physical Society (APS)
Date: 17-09-2020
Publisher: American Physical Society (APS)
Date: 17-03-2021
Publisher: American Physical Society (APS)
Date: 21-01-2021
Location: China
No related grants have been discovered for Jiajun Wu.