检索结果-南通市图书馆

Decay properties of the Zc(3900)through the Fierz rearrangement

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2020年第11期44卷 109-126页

作者： hua-xing chen School of Physics Beihang UniversityBeijing 100191China School of Physics Southeast UniversityNanjing 210094China

We systematically construct all the tetraquark currents/operators of J^PC=1^+− with the quark configurations[cq][cq],[cq][qc],and[cc][qq](q=u/d),and derive their relations through the Fierz rearrangement of the Dirac and color *** the transformations of[qc][qc]→[cc][qq]and[cq][qc],we study decay properties of the Zc(3900)as a compact tetraquark state;while using the transformation of[cq][qc]→[cc][qq],we study its decay properties as a hadronic molecular state.

关键词： Fierz rearrangement exotic hadron compact tetraquark hadronic molecule interpolating current

Hidden-charm pentaquark states through current algebra:from their production to decay

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2022年第9期46卷 62-93页

作者： hua-xing chen School of Physics Southeast UniversityNanjing 210094China

There may be sevenD^((*))Σ_(c)^((*))hadronic molecular *** construct their corresponding interpolating currents and calculate their masses and decay constants using QCD sum *** on these results,we calculate their relative production rates inΛ^(0)_(b)decays using current algebra,that is,B(Λ^(0)_(b)→P_(c)K^(-)):B(Λ^(0)_(b)→P′_(c)K^(-)),where P_(c)and P′_(c)are two different *** also study their decay properties via Fierz rearrangement and further calculate these ratios in the J/ψp mass spectrum,that is,B(Λ^(0)_(b)→P_(c)K^(-)→J/ψpK^(-)):B(Λ^(0)_(b)→P′_(c)K^(-)→J/ψpK^(-)).Our results suggest that theD*Σ^(*)_(c)molecular states of JP=1/2^(-)and 3/2^(-)may be observed in future experiments.

关键词： exotic hadron pentaquark state hadronic molecule interpolating current QCD sum rules current algebra Fierz rearrangement

QCD Axial Anomaly Enhances theηη'Decay of the Hybrid Candidateη1(1855)

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2022年第5期39卷 29-35页

作者： hua-xing chen Niu Su Shi-Lin Zhu School of Physics Southeast UniversityNanjing 210094China School of Physics and Center of High Energy Physics Peking UniversityBeijing 100871China

We study the hybrid mesons with the exotic quantum number I^(G)J^(PG)=0+1-+and investigate their decays into theηη’,a1(1260)π,f1(1285)η,f1(1420)η,K*(892)■,K1(1270)■,and K1(1400)■*** is found that the QCD axial anomaly enhances the decay width of theηη’channel although this mode is strongly suppressed by the small p-wave phase *** results support the interpretation of theη1(1855)recently observed by BESⅢas the ssg hybrid meson of I^(G)J^(PC)=0^(+)1^(-+).The QCD axial anomaly ensures theηη’decay mode to be a characteristic signal of the hybrid nature of theη1(1855).

关键词： BESⅢ QCD mode

X0(2900)and X1(2900):Hadronic Molecules or Compact Tetraquarks

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2020年第10期37卷 12-16页

作者： hua-xing chen Wei chen Rui-Rui Dong Niu Su School of Physics Southeast UniversityNanjing 210094China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China School of Physics Beihang UniversityBeijing 100191China

Very recently the LHCb collaboration reported their observation of the first two fully open-flavor tetraquark states,the X 0(2900)of J P=0^+and the X 1(2900)of J P=1^−.We study their possible interpretations using the method of QCD sum rules,paying special attention to an interesting feature of this experiment that the higher resonance X 1(2900)has a width significantly larger than the lower one X 0(2900).Our results suggest that the X 0(2900)can be interpreted as the s-wave D∗−K∗+molecule state of J P=0^+,and the X 1(2900)can be interpreted as the p-wave¯c¯s u d compact tetraquark state of J P=1^−.Mass predictions of their bottom partners are also given.

关键词： quark wave state

Strong decays of fully-charm tetraquarks into di-charmonia

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2020年第23期65卷 1994-2000,M0004页

作者： hua-xing chen Wei chenc Xiang Liu Shi-Lin Zhu School of Physics Southeast UniversityNanjing 210094China School of Physics Beihang UniversityBeijing 100191China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Research Center for Hadron and CSR Physics Lanzhou University and Institute of Modern Physics of CAS.Lanzhou 730000China School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University.Beijing 100871.China Collaborative Innovation Center of Quantum Matter Beijing 100871China Center of High Energy Physics Peking UniversityBeijing 100871China

We study strong decays of the possible fully-charm tetraquarks recently observed by LHCb,and calculate their relative branching ratios through the Fierz *** with our previous QCD sum rule study,our results suggest that the broad structure around 6.2–6.8 GeV can be interpreted as an S-wave cccc tetraquark state with JPC=0++or 2++,and the narrow structure around 6.9 GeV can be interpreted as a P-wave one with JPC=0-+or 1-+.These structures were observed in the di-J=w invariant mass spectrum,and we propose to confirm them in the di-gc;J/ψhc;ηcχc0,and ηcχ*** also propose to search for their partner states having the negative charge-conjugation parity in the J/ψηc;J/ψχc0;J/ψχc1,and ηchc channels.

关键词： Fully-heavy tetraquark QCD sum rules Fierz rearrangement

Exotic ΩΩ dibaryon states in a molecular picture

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2021年第4期45卷 6-13页

作者： Xiao-Hui chen Qi-Nan Wang Wei chen hua-xing chen School of Physics Sun Yat-Sen UniversityGuangzhou 510275China School of Physics Southeast UniversityNanjing 210094China

We investigate the exotic ΩΩ dibaryon states with J^(P)=0^(+)and 2^(+)in a molecular *** construct a tensorΩΩmolecular interpolating current and calculate the two-point correlation function within the method of QCD sum *** calculations indicate that the masses of the scalar and tensor dibaryon states are mΩΩ,0^(+)=(3.33±0.51)GeV and mΩΩ,2^(+)=(3.15±0.33)GieV,respectively,which are below the 2mΩ*** error,these results do not negate the existence of loosely bound molecularΩΩdibaryon *** exotic strangeness S=-6 and doubly-chargedΩΩdibaryons,if they exist,may be identified in heavy-ion collision processes in the fu-ture.

关键词： QCD sum rules molecular state dibaryon

Exotic D_(s)^(*)D^(*) molecular states and scqc tetraquark states with J^(P)=0^(+),1^(+),2^(+)

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2021年第9期45卷 28-43页

作者： Qi-Nan Wang Wei chen hua-xing chen School of Physics Sun Yat-Sen UniversityGuangzhou 510275China School of Physics Southeast UniversityNanjing 210094China

We have calculated the mass spectra for the D_(s)^(*)D^(*) molecular states and scqc tetraquark states with J^(P)=0^(+),1^(+),2^(+).The masses of the axial-vector D_(s)^(*)D^(*),D_(s)^(*)D molecular states and 1_([sc])㊉0_([qc]),0_([sc])©1_([qc])tetraquark states are predicted to be approximately 3.98 GeV,in good agreement with the mass of Z_(cs)(3985)^(-)from *** both the molecular and diquark-antidiquark scenarios,our results suggest that there may exist two almost degenerate states,as the strange partners of X(3872)and Z_(c)(3900).We propose to carefully examine Z_(cs)(3985)in future experiments to verify *** may also search for more hidden-charm four-quark states with strangeness in not only the open-charm D_(s)^(*)D^(*) channels but also the hidden-charm channels η_(c)K/K^(*),J/ψK/K^(*).

关键词： molecular state exotic state QCD sum rules

Revisiting hidden-charm pentaquarks from QCD sum rules

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2019年第3期43卷 72-81页

作者： Jia-Bing Xiang hua-xing chen Wei chen Xiao-Bo Li xing-Qun Yao Shi-Lin Zhu School of Physics and Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 100191China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Center of High Energy Physics Peking UniversityBeijing 100871China

We revisit hidden-charm pentaquark states P_c(4380) and P_c(4450) using the method of QCD sum rules by requiring the pole contribution to be greater than or equal to 30% in order to better that the one-pole parametrization is valid. We find two mixing currents, and our results suggest that P_c(4380) and P_c(4450) can be identified as hiddencharm pentaquark states having J^P= 3/2^-and 5/2^+, respectively. However, there still exist other possible spin-parity assignments, such as J^P = 3/2^+ and J^P = 5/2^-, which must be clarified in further theoretical and experimental studies.

关键词： exotic hadrons pentaquark states QCD sum rules

Covalent hadronic molecules induced by shared light quarks

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第12期74卷 62-86页

作者： hua-xing chen School of Physics Southeast UniversityNanjing 210094China

After examining Feynman diagrams corresponding to the ■, ■, ■, and ■ hadronic molecular states, we propose a possible binding mechanism induced by shared light quarks. This mechanism is similar to the covalent bond in chemical molecules induced by shared electrons. We use the method of QCD sum rules to calculate its corresponding light-quark-exchange diagrams, and the obtained results indicate a model-independent hypothesis: the light-quark-exchange interaction is attractive when the shared light quarks are totally antisymmetric so they obey the Pauli principle. We build a toy model with four parameters to formulize this picture and estimate binding energies of some possibly-existing covalent hadronic molecules. A unique feature of this picture is that the binding energies of the(I)JP=(0)1+■ hadronic molecules are much larger than those of the (I)JP=(0)1+■ ones, while the(I)JP=(1/2)1/2+■ hadronic molecules have similar binding energies.

关键词： hadronic molecule covalent bond QCD sum rules