The mid-rapidity transverse momentum spectra of charmed mesons in Pb–Pb and pp(p)collisions are analyzed using the Tsallis–Pareto distribution derived from non-extensive statistics.We provide uniform descriptions of...The mid-rapidity transverse momentum spectra of charmed mesons in Pb–Pb and pp(p)collisions are analyzed using the Tsallis–Pareto distribution derived from non-extensive statistics.We provide uniform descriptions of both small and large systems over a wide range of collision energies and hadron transverse momenta.By establishing the relationship between the event multiplicity and Tsallis parameters,we observe that there is a signifi-cant linear relationship between the thermal temperature and Tsallis q parameter in Pb–Pb collisions at √sNN=2.76 TeV and 5.02 TeV.Further,the slope of the T–(q-1)parameter plot is positively correlated with the hadron mass.In addition,charmed mesons have a higher thermal temperature than light hadrons at the same q-1,indicat-ing that the charm flavor requires a higher temperature to reach the same degree of non-extensivity as light flavors in heavy-ion collisions.The same fit is applied to the trans-verse momentum spectra of charmed mesons in pp(p)collisions over a large energy range using the Tsallis–Pareto distribution.It is found that the thermal temperature increases with system energy,whereas the q parameter becomes saturated at the pp(p)limit,q-1=0.142±0.010.In addition,the results of most peripheral Pb–Pb collisions are found to approach the pp(p)limit,which suggests that more peripheral heavy-ion collisions are less affected by the medium and more similar to pp(p)collisions.展开更多
Based on the nuclear effects considered in the Glauber-Gribov approach,charmed meson production inhigh energy deep inelastic e+A scattering is investigated in the color dipole formalism.Using the Peterson fragmentatio...Based on the nuclear effects considered in the Glauber-Gribov approach,charmed meson production inhigh energy deep inelastic e+A scattering is investigated in the color dipole formalism.Using the Peterson fragmentationfunction and the KLR-AdS/CFT color dipole model,which reasonably well describes the HERA data for the inclusivestructure functions at small Bjorken-x,we present the predictive results for the D-meson transverse spectra at EIC andLHeC energies.The theoretical results indicate that the x-independence phenomena at very small-x predicted by theKLR-AdS/CFT model are not seen in our calculation.展开更多
In this work, we evaluate the lifetimes of the doubly charmed baryons Ξcc^＋ ,Ξcc^＋＋, and Ωcc^＋. We carefully calculate the non-spectator contributions at the quark level, where the Cabibbo-suppressed diagrams a...In this work, we evaluate the lifetimes of the doubly charmed baryons Ξcc^＋ ,Ξcc^＋＋, and Ωcc^＋. We carefully calculate the non-spectator contributions at the quark level, where the Cabibbo-suppressed diagrams are also included. The hadronic matrix elements are evaluated in the simple non-relativistic harmonic oscillator model. Our numerical results are generally consistent with that obtained by other authors who used the diquark model. However, all the theoretical predictions on the lifetimes are one order larger than the upper limit set by the recent SELEX measurement. This discrepancy would be clarified by the future experiment. If more accurate experiment still confirms the value of the SELEX collaboration, there must be some unknown mechanism to be explored.展开更多
A method to determine the value of the ratio of charmed baryon to meson in e^(+)e^(-) annihilation is investigated.Using the data of CLEO,HRS and MARK Ⅱ groups,we obtain f≡B_(c)/M_(c)=0.21±0.05,0.24±0.08 a...A method to determine the value of the ratio of charmed baryon to meson in e^(+)e^(-) annihilation is investigated.Using the data of CLEO,HRS and MARK Ⅱ groups,we obtain f≡B_(c)/M_(c)=0.21±0.05,0.24±0.08 and 0.33±0.05,for √s=5.2,10.55 and 29GeV,respectively.展开更多
The quest for understanding the internal structure of hadrons is key to probing how color confinement,which remains a fundamental challenge in the Standard Model,manifests itself.The lowest-lying hadrons fit well into...The quest for understanding the internal structure of hadrons is key to probing how color confinement,which remains a fundamental challenge in the Standard Model,manifests itself.The lowest-lying hadrons fit well into the classification of the conventional quark model,such as quark-antiquark mesons and three-quark baryons.However,for excited states,the energy excitation inside a hadron can be distributed in various ways:it can appear as orbital or radial excitation within a conventional quark model configuration,or it leads to the creation of a quark-antiquark pair.展开更多
In this study,we employed the heavy quark expansion model with the kinetic scheme to evaluate os(m^(2)_(c)),the strong coupling constant at the chamn quark mass me,using data on inclusive semileptonic decays of charme...In this study,we employed the heavy quark expansion model with the kinetic scheme to evaluate os(m^(2)_(c)),the strong coupling constant at the chamn quark mass me,using data on inclusive semileptonic decays of charmed mesons.Using the experimental values of the semileptonic decay widths of the D^(0)and the D^(+),the value of ars(m^(2))was determined to be 0.445±0.009±0.114,where the first uncertainty is experimental and the second is systematic.This value of a,(m^(2))is in good agreement with the value of ar,(m^(2)_(c))which calculated by running as(m^(2))athe 20 bo-son mass mz with the renormalization group evolution equation.In addition,the values of a_(s)(m^(2)_(c))obtained individu-ally from each of the D,D+,and D5 mesons were consistent,as they were of the same origin.展开更多
We present the first calculation of the connected scalar matrix element and the momentum fraction of the charm quark within the 3/2^(+)and 3/2^(-)triply charmed baryons on lattice QCD. The results are based on overlap...We present the first calculation of the connected scalar matrix element and the momentum fraction of the charm quark within the 3/2^(+)and 3/2^(-)triply charmed baryons on lattice QCD. The results are based on overlap valence fermions on two ensembles of N_(f)= 2 + 1 domain wall fermion configurations with two lattice spacings. The corresponding sea quark pion masses are 300 MeV and 278 MeV. The separated contributions to the triply charmed baryon mass are derived through the decomposition of the QCD energy-momentum tensor. The contribution of the connected charm quark matrix element to the triply charmed baryon is about 3/2 times that of the charmonium, and it is almost 70% of the total mass. The mass splitting of 3/2^(+)and 3/2^(-)triply charmed baryons is mainly from the 〈H_(E)〉 of the QCD energy-momentum tensor. A mass decomposition based on the quark model is also studied for comparison.展开更多
In this study,we investigate the production of doubly charmed baryons from anti-bottom charmedmesons.Using the effective Lagrangian approach,we discuss triangle diagrams at the hadronic level to access thebranching ra...In this study,we investigate the production of doubly charmed baryons from anti-bottom charmedmesons.Using the effective Lagrangian approach,we discuss triangle diagrams at the hadronic level to access thebranching ratios of B_(c)→B(ccq)+B(c^(-)q^(-)q^(-)).Apparently,the specific process B_(c)→Ξ_(cc)^(+)Ξ′_(c^(-))^(0) occupies the largest possibilityon the order of 9.1×10^(-5).In addition,although the production of undiscovered Ω_(cc)^(+) is Cabibbo suppressed in B^(-)_(c)→Ω_(cc)^(+)Ξ_(c^(-))^(0),its branching ratio can still reach a level of 10^(-7).These results are expected to provide valuable supportfor future experiments.展开更多
We introduce a relative P-wave to construct the doubly charmed diquark(V) vector. Therefore, scalar and tensor four-quark currents were constructed to investigate the decay widths of the fully charmed tetraquark state...We introduce a relative P-wave to construct the doubly charmed diquark(V) vector. Therefore, scalar and tensor four-quark currents were constructed to investigate the decay widths of the fully charmed tetraquark states with J^(PC)= 0^(++), 1^(+-)and 2^(++) via quantum chromodynamics(QCD) sum rules. We observed that the total width of the ground state VV-type scalar tetraquark state is compatible with that of the X(6552) within uncertainties, and the branching ratios are quite different from that of the first radial excitation of the AA-type scalar tetraquark state. Other predictions can be verified in future experiments to shed light on the nature of the fully charmed tetraquark states.展开更多
This work presents the first detailed numerical predictions of CP violation in antitriplet charmed baryon decays.Adopting the flavor SU(3),symmetry and the final state re-scattering framework,we relate the CKM-suppres...This work presents the first detailed numerical predictions of CP violation in antitriplet charmed baryon decays.Adopting the flavor SU(3),symmetry and the final state re-scattering framework,we relate the CKM-suppressed amplitudes to the leading ones,which are proportional to λ_(b) and λ_(d),respectively,with λ_(q)=V_(uq)V_(cq)^(*).Larger-than-expected CP violations are found,reaching the order of 10^(-3),similar in magni-tude to those in D^(0)→π^(+)π^(-),K^(+)K^(-).This opens a promising avenue for observing CP violation in charmed baryon decays and testing the Standard Model.展开更多
A search for the doubly charmed baryon ■^+cc is performed through its decay to theΛ^+c K^-π^+ final state,using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7,8 and 13...A search for the doubly charmed baryon ■^+cc is performed through its decay to theΛ^+c K^-π^+ final state,using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7,8 and 13 TeV.The data correspond to a total integrated luminosity of 9 fb^-1.No significant signal is observed in the mass range from 3.4 to 3.8 GeV/c^2.Upper limits are set at 95%credibility level on the ratio of the ■^+cc production cross-section times the branching fraction to that ofΛ^+c and ■^++cc baryons.The limits are determined as functions of the ■^+cc mass for different lifetime hypotheses,in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 4 to 15 GeV/c.展开更多
A search for the doubly charmed baryon ?cc+ with the decay mode c Ω_(cc)^(+)→ Ξc+K-π+ is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment from 2016...A search for the doubly charmed baryon ?cc+ with the decay mode c Ω_(cc)^(+)→ Ξc+K-π+ is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of 5.4 fb-1. No significant signal is observed within the invariant mass range of 3.6 to 4.0 GeV/c2. Upper limits are set on the ratio R of the production cross-section times the total branching fraction of the Ω_(cc)^(+)→ Ξc+K-π+ decay with respect to the Ξcc++→ Λc+K-π+π+ decay. Upper limits at 95% credibility level for R in the range 0.005 to 0.11 are obtained for diferent hypotheses on the ?cc+ mass and lifetime in the rapidity range from 2.0 to 4.5 and transverse momentum range from 4 to 15 GeV/c.展开更多
This is essentially an update of Ref. [1] [H. Y. Cheng, Int. J. Mod. Phys. A 24 （Suppl. 1）, 593 （2009）], a review of charmed baryon physics around 2007. Topics covered in this review include the spectroscopy, stro...This is essentially an update of Ref. [1] [H. Y. Cheng, Int. J. Mod. Phys. A 24 （Suppl. 1）, 593 （2009）], a review of charmed baryon physics around 2007. Topics covered in this review include the spectroscopy, strong decays, lifetimes, nonleptonic and semileptonic weak decays, and electromagnetic decays of charmed baryons.展开更多
The existence of doubly heavy flavor baryons has not been well established experimentally so far. In this Letter we systematically investigate the weak decays of the doubly charmed baryons, Ξ;and Ξ;, which should be...The existence of doubly heavy flavor baryons has not been well established experimentally so far. In this Letter we systematically investigate the weak decays of the doubly charmed baryons, Ξ;and Ξ;, which should be helpful for experimental searches for these particles. The long-distance contributions are first studied in the doubly heavy baryon decays, and found to be significantly enhanced. Comparing all the processes, Ξ;→Λ;K;π;π;andΞ;π;are the most favorable decay modes for experiments to search for doubly heavy baryons.展开更多
CHARMED BARYONS Revised March 2012 by C.G. Wohl （LBNL）. There are 17 known charmed baryons, and four other candidates not well enough established to be promoted to the Summary Tables.＊ Fig. l（a） shows the mass sp...CHARMED BARYONS Revised March 2012 by C.G. Wohl （LBNL）. There are 17 known charmed baryons, and four other candidates not well enough established to be promoted to the Summary Tables.＊ Fig. l（a） shows the mass spectrum,展开更多
We propose to measure the decay asymmetry parameters in the hadronic weak decays of singly charmed baryons, such as Λc^＋ →Λπ^＋, Σ^0π^＋, pK0, Ξ0c →Ξ-π＋and Ω^0c →Ω^-π^＋. The joint angular formulae for...We propose to measure the decay asymmetry parameters in the hadronic weak decays of singly charmed baryons, such as Λc^＋ →Λπ^＋, Σ^0π^＋, pK0, Ξ0c →Ξ-π＋and Ω^0c →Ω^-π^＋. The joint angular formulae for these processes are presented, and are used to extract the asymmetry parameters in e^＋e^-annihilation data. Base on the currentΛ＋c data set collected at BESIII, we estimate the experimental sensitivities to measure the parameters αΛπ＋forΛ＋c →Λπ＋, αΣ＋π0for Λc^＋ →Σ＋π^0 and αΣ0π＋for Λc^＋ →Σ^0π^＋.展开更多
Using the covariant light-front approach with conventional vertex functions, we estimate the production rates of D-wave charmed/charmed-strange mesons via the B_((s)) semileptonic decays. As the calculated production ...Using the covariant light-front approach with conventional vertex functions, we estimate the production rates of D-wave charmed/charmed-strange mesons via the B_((s)) semileptonic decays. As the calculated production rates are significant, it seems possible to experimentally search for D-wave charmed/charmed-strange mesons via semileptonic decays, which may provide an additional approach for exploring D-wave charmed/charmed-strange mesons.展开更多
The yields of the charmed mesons in e^+e^- annihilations have been calculated in virtue of the quark production rule and quark combination rule proposed in Ref. [1]. The results are in agreement with the experimental ...The yields of the charmed mesons in e^+e^- annihilations have been calculated in virtue of the quark production rule and quark combination rule proposed in Ref. [1]. The results are in agreement with the experimental data, which shows that the mechanism for e^+e^- annihilation into hardons is successful.展开更多
We study the properties of charmed hadrons in dense matter within a coupled-channel approach which accounts for Pauli blocking effects and meson self-energies in a self-consistent manner.We analyze the behaviour in th...We study the properties of charmed hadrons in dense matter within a coupled-channel approach which accounts for Pauli blocking effects and meson self-energies in a self-consistent manner.We analyze the behaviour in this dense environment of dynamically-generated baryonic resonances as well as the open-charm meson spectral functions.We discuss the implications of the in-medium properties of open-charm mesons on the D s0 （2317） and the predicted X（3700） scalar resonances.展开更多
基金This is supported by the National Key Research and Development Program of China(Nos.2018YFE0205200 and 2018YFE0104700)National Natural Science Foundation of China(Nos.11890712 and 12061141008)+1 种基金Strategic Priority Research Program of CAS(No.XDB34030000)Anhui Provincial Natural Science Foundation(No.1808085J02).
文摘The mid-rapidity transverse momentum spectra of charmed mesons in Pb–Pb and pp(p)collisions are analyzed using the Tsallis–Pareto distribution derived from non-extensive statistics.We provide uniform descriptions of both small and large systems over a wide range of collision energies and hadron transverse momenta.By establishing the relationship between the event multiplicity and Tsallis parameters,we observe that there is a signifi-cant linear relationship between the thermal temperature and Tsallis q parameter in Pb–Pb collisions at √sNN=2.76 TeV and 5.02 TeV.Further,the slope of the T–(q-1)parameter plot is positively correlated with the hadron mass.In addition,charmed mesons have a higher thermal temperature than light hadrons at the same q-1,indicat-ing that the charm flavor requires a higher temperature to reach the same degree of non-extensivity as light flavors in heavy-ion collisions.The same fit is applied to the trans-verse momentum spectra of charmed mesons in pp(p)collisions over a large energy range using the Tsallis–Pareto distribution.It is found that the thermal temperature increases with system energy,whereas the q parameter becomes saturated at the pp(p)limit,q-1=0.142±0.010.In addition,the results of most peripheral Pb–Pb collisions are found to approach the pp(p)limit,which suggests that more peripheral heavy-ion collisions are less affected by the medium and more similar to pp(p)collisions.
基金Supported by Natural Science Foundation of Hebei Province under Grant No. A2008000421
文摘Based on the nuclear effects considered in the Glauber-Gribov approach,charmed meson production inhigh energy deep inelastic e+A scattering is investigated in the color dipole formalism.Using the Peterson fragmentationfunction and the KLR-AdS/CFT color dipole model,which reasonably well describes the HERA data for the inclusivestructure functions at small Bjorken-x,we present the predictive results for the D-meson transverse spectra at EIC andLHeC energies.The theoretical results indicate that the x-independence phenomena at very small-x predicted by theKLR-AdS/CFT model are not seen in our calculation.
基金The project supported by National Natural Science Foundation of China
文摘In this work, we evaluate the lifetimes of the doubly charmed baryons Ξcc^＋ ,Ξcc^＋＋, and Ωcc^＋. We carefully calculate the non-spectator contributions at the quark level, where the Cabibbo-suppressed diagrams are also included. The hadronic matrix elements are evaluated in the simple non-relativistic harmonic oscillator model. Our numerical results are generally consistent with that obtained by other authors who used the diquark model. However, all the theoretical predictions on the lifetimes are one order larger than the upper limit set by the recent SELEX measurement. This discrepancy would be clarified by the future experiment. If more accurate experiment still confirms the value of the SELEX collaboration, there must be some unknown mechanism to be explored.
文摘A method to determine the value of the ratio of charmed baryon to meson in e^(+)e^(-) annihilation is investigated.Using the data of CLEO,HRS and MARK Ⅱ groups,we obtain f≡B_(c)/M_(c)=0.21±0.05,0.24±0.08 and 0.33±0.05,for √s=5.2,10.55 and 29GeV,respectively.
基金supported in part by the National Natural Science Foundation of China(12125507,12361141819,and 12447101)the National Key R&D Program of China(2023YFA1606703)the Chinese Academy of Sciences(YSBR101).
文摘The quest for understanding the internal structure of hadrons is key to probing how color confinement,which remains a fundamental challenge in the Standard Model,manifests itself.The lowest-lying hadrons fit well into the classification of the conventional quark model,such as quark-antiquark mesons and three-quark baryons.However,for excited states,the energy excitation inside a hadron can be distributed in various ways:it can appear as orbital or radial excitation within a conventional quark model configuration,or it leads to the creation of a quark-antiquark pair.
基金Supported by the National Natural Science Foundation of China(12247119,12042507)。
文摘In this study,we employed the heavy quark expansion model with the kinetic scheme to evaluate os(m^(2)_(c)),the strong coupling constant at the chamn quark mass me,using data on inclusive semileptonic decays of charmed mesons.Using the experimental values of the semileptonic decay widths of the D^(0)and the D^(+),the value of ars(m^(2))was determined to be 0.445±0.009±0.114,where the first uncertainty is experimental and the second is systematic.This value of a,(m^(2))is in good agreement with the value of ar,(m^(2)_(c))which calculated by running as(m^(2))athe 20 bo-son mass mz with the renormalization group evolution equation.In addition,the values of a_(s)(m^(2)_(c))obtained individu-ally from each of the D,D+,and D5 mesons were consistent,as they were of the same origin.
基金Supported by the National Natural Science Foundation of China (12175036, 11935017, 12175073, 12205311, 12222503)the Natural Science Foundation of Hunan Province,China (2023JJ30380, 2024JJ6300)+1 种基金the Department of Education Foundation of Hunan Province,China (20A310, 22B0044)the Major Project of Basic and Applied Basic Research of Guangdong Province,China (2020B0301030008)。
文摘We present the first calculation of the connected scalar matrix element and the momentum fraction of the charm quark within the 3/2^(+)and 3/2^(-)triply charmed baryons on lattice QCD. The results are based on overlap valence fermions on two ensembles of N_(f)= 2 + 1 domain wall fermion configurations with two lattice spacings. The corresponding sea quark pion masses are 300 MeV and 278 MeV. The separated contributions to the triply charmed baryon mass are derived through the decomposition of the QCD energy-momentum tensor. The contribution of the connected charm quark matrix element to the triply charmed baryon is about 3/2 times that of the charmonium, and it is almost 70% of the total mass. The mass splitting of 3/2^(+)and 3/2^(-)triply charmed baryons is mainly from the 〈H_(E)〉 of the QCD energy-momentum tensor. A mass decomposition based on the quark model is also studied for comparison.
基金support by National Natural Science Foundation of China(12005294)the Fundamental Funds for Key disciplines in Physics(2022WLXK05)supported by National Natural Science Foundation of China(12105247)。
文摘In this study,we investigate the production of doubly charmed baryons from anti-bottom charmedmesons.Using the effective Lagrangian approach,we discuss triangle diagrams at the hadronic level to access thebranching ratios of B_(c)→B(ccq)+B(c^(-)q^(-)q^(-)).Apparently,the specific process B_(c)→Ξ_(cc)^(+)Ξ′_(c^(-))^(0) occupies the largest possibilityon the order of 9.1×10^(-5).In addition,although the production of undiscovered Ω_(cc)^(+) is Cabibbo suppressed in B^(-)_(c)→Ω_(cc)^(+)Ξ_(c^(-))^(0),its branching ratio can still reach a level of 10^(-7).These results are expected to provide valuable supportfor future experiments.
基金Supported by the National Natural Science Foundation (12175068)the Fundamental Research Funds for the Central Universities。
文摘We introduce a relative P-wave to construct the doubly charmed diquark(V) vector. Therefore, scalar and tensor four-quark currents were constructed to investigate the decay widths of the fully charmed tetraquark states with J^(PC)= 0^(++), 1^(+-)and 2^(++) via quantum chromodynamics(QCD) sum rules. We observed that the total width of the ground state VV-type scalar tetraquark state is compatible with that of the X(6552) within uncertainties, and the branching ratios are quite different from that of the first radial excitation of the AA-type scalar tetraquark state. Other predictions can be verified in future experiments to shed light on the nature of the fully charmed tetraquark states.
基金supported by the National Key Research and Development Program of China(2020YFC2201501)the National Natural Science Foundation of China(12090064,12205063,12375088,and W2441004)the China Postdoctoral Science Foundation(2023M742293).
文摘This work presents the first detailed numerical predictions of CP violation in antitriplet charmed baryon decays.Adopting the flavor SU(3),symmetry and the final state re-scattering framework,we relate the CKM-suppressed amplitudes to the leading ones,which are proportional to λ_(b) and λ_(d),respectively,with λ_(q)=V_(uq)V_(cq)^(*).Larger-than-expected CP violations are found,reaching the order of 10^(-3),similar in magni-tude to those in D^(0)→π^(+)π^(-),K^(+)K^(-).This opens a promising avenue for observing CP violation in charmed baryon decays and testing the Standard Model.
基金support from CERN and from the national agencies:CAPES,CNPq，FAPERJ and FINEP(Brazil)MOST and NSFC(China)+11 种基金CNRS/IN2P3(France)BMBF,DFG and MPG(Germany)INFN(Italy)KWO(Netherlands)MNiSW and NCN(Poland)MEN/IFA(Romania)MinES and FASO(Russia)MinECo(Spain)SNSF and SER(Switzerland)NASU(Ukraine)STFC(United Kingdom)NSF(USA).
文摘A search for the doubly charmed baryon ■^+cc is performed through its decay to theΛ^+c K^-π^+ final state,using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7,8 and 13 TeV.The data correspond to a total integrated luminosity of 9 fb^-1.No significant signal is observed in the mass range from 3.4 to 3.8 GeV/c^2.Upper limits are set at 95%credibility level on the ratio of the ■^+cc production cross-section times the branching fraction to that ofΛ^+c and ■^++cc baryons.The limits are determined as functions of the ■^+cc mass for different lifetime hypotheses,in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 4 to 15 GeV/c.
基金Open Access funding provided by CERN(European Organization for Nuclear Research).
文摘A search for the doubly charmed baryon ?cc+ with the decay mode c Ω_(cc)^(+)→ Ξc+K-π+ is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of 5.4 fb-1. No significant signal is observed within the invariant mass range of 3.6 to 4.0 GeV/c2. Upper limits are set on the ratio R of the production cross-section times the total branching fraction of the Ω_(cc)^(+)→ Ξc+K-π+ decay with respect to the Ξcc++→ Λc+K-π+π+ decay. Upper limits at 95% credibility level for R in the range 0.005 to 0.11 are obtained for diferent hypotheses on the ?cc+ mass and lifetime in the rapidity range from 2.0 to 4.5 and transverse momentum range from 4 to 15 GeV/c.
文摘This is essentially an update of Ref. [1] [H. Y. Cheng, Int. J. Mod. Phys. A 24 （Suppl. 1）, 593 （2009）], a review of charmed baryon physics around 2007. Topics covered in this review include the spectroscopy, strong decays, lifetimes, nonleptonic and semileptonic weak decays, and electromagnetic decays of charmed baryons.
基金Supported by National Natural Science Foundation of China(11505083,11505098,11647310,11575110,11375208,11521505,11621131001,11235005,11447032,U1732101)Natural Science Foundation of Shanghai(15DZ2272100)
文摘The existence of doubly heavy flavor baryons has not been well established experimentally so far. In this Letter we systematically investigate the weak decays of the doubly charmed baryons, Ξ;and Ξ;, which should be helpful for experimental searches for these particles. The long-distance contributions are first studied in the doubly heavy baryon decays, and found to be significantly enhanced. Comparing all the processes, Ξ;→Λ;K;π;π;andΞ;π;are the most favorable decay modes for experiments to search for doubly heavy baryons.
文摘CHARMED BARYONS Revised March 2012 by C.G. Wohl （LBNL）. There are 17 known charmed baryons, and four other candidates not well enough established to be promoted to the Summary Tables.＊ Fig. l（a） shows the mass spectrum,
基金Supported by National Natural Science Foundation of China(11375205,11175146,11275266,11235011,11425524,11505010,11565006)Beijing Municipal Government Foundation(KM201610017009,2015000020124G064)Youth Innovation Promotion Association of CAS
文摘We propose to measure the decay asymmetry parameters in the hadronic weak decays of singly charmed baryons, such as Λc^＋ →Λπ^＋, Σ^0π^＋, pK0, Ξ0c →Ξ-π＋and Ω^0c →Ω^-π^＋. The joint angular formulae for these processes are presented, and are used to extract the asymmetry parameters in e^＋e^-annihilation data. Base on the currentΛ＋c data set collected at BESIII, we estimate the experimental sensitivities to measure the parameters αΛπ＋forΛ＋c →Λπ＋, αΣ＋π0for Λc^＋ →Σ＋π^0 and αΣ0π＋for Λc^＋ →Σ^0π^＋.
基金Supported by the National Natural Science Foundation of China(11222547,11175073,11647301)the National Program for Support of Top-notch Young Professionalsthe Fundamental Research Funds for the Central Universities
文摘Using the covariant light-front approach with conventional vertex functions, we estimate the production rates of D-wave charmed/charmed-strange mesons via the B_((s)) semileptonic decays. As the calculated production rates are significant, it seems possible to experimentally search for D-wave charmed/charmed-strange mesons via semileptonic decays, which may provide an additional approach for exploring D-wave charmed/charmed-strange mesons.
文摘The yields of the charmed mesons in e^+e^- annihilations have been calculated in virtue of the quark production rule and quark combination rule proposed in Ref. [1]. The results are in agreement with the experimental data, which shows that the mechanism for e^+e^- annihilation into hardons is successful.
基金partly supported by the EU contract No.MRTN-CT-2006- 035482 (FLAVIAnet)the contracts FIS2008-01661 and FIS2008-01143 from MICINN (Spain)+3 种基金the Spanish Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042)the Generalitat de Catalunya contract 2009SGR-1289Junta de Andalucía under contract FQM225the support of the European Community-Research Infrastructure Integrating Activity 'Study of Strongly Interacting Matter' (HadronPhysics2,Grant Agreement n.227431) under the 7th Framework Programme of EU
文摘We study the properties of charmed hadrons in dense matter within a coupled-channel approach which accounts for Pauli blocking effects and meson self-energies in a self-consistent manner.We analyze the behaviour in this dense environment of dynamically-generated baryonic resonances as well as the open-charm meson spectral functions.We discuss the implications of the in-medium properties of open-charm mesons on the D s0 （2317） and the predicted X（3700） scalar resonances.
