共查询到20条相似文献,搜索用时 15 毫秒
1.
Craig D. Roberts 《Few-Body Systems》2012,52(3-4):345-355
In tackling QCD, a constructive feedback between theory and extant and forthcoming experiments is necessary in order to place constraints on the infrared behaviour of QCD’s β-function, a key nonperturbative quantity in hadron physics. The Dyson–Schwinger equations provide a tool with which to work toward this goal. They connect confinement with dynamical chiral symmetry breaking, both with the observable properties of hadrons, and hence can plausibly provide a means of elucidating the material content of real-world QCD. This contribution illustrates these points via comments on: in-hadron condensates; dressed-quark anomalous chromo- and electro-magnetic moments; the spectra of mesons and baryons, and the critical role played by hadron-hadron interactions in producing these spectra. 相似文献
2.
LI Xiao-Ya 《理论物理通讯》2006,46(10)
[1]LEPS Collaboration (T.Nakano,et al.),Phys.Rev.Lett.91 (2003) 012002.
[2]Sonia Kabana,J.Phys.G 31 (2005) S1155,hepex/0503019.
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[4]T.Nakano,et al.,(LEPS),Phys.Rev.Lett.91 (2003)012002,hep-ex/0301020.
[5]V.V.Barmin,et al.,(DIANA),Phys.Atom.Nuclei 66(2003) 1715,hep-ex/0304040.
[6]J.Barth,et al.,(SAPHIR),Phys.Lett.B 572 (2003) 127,hep-ex/0307083.
[7]NA49 Collaboration (C.Alt,et al.),Phys.Rev.Lett.92(2004) 042003.
[8]S.Kabana,et al.,STAR Coll.,Proceedings of the 20th Winter Workshop in Nuclear Dynamics,Jamaica,March (2004),hep-ex/0406032.
[9]V.Kouznetsov,et al.,GRAAL Collaboration,Contribution to the Workshop Pentaquarks,Trento,10-12 February,(2004),http://www.tp2.ruhr-uni-bochum.de/talks/trento04/.
[10]Shi-Lin Zhu,Int.J.Mod.Phys.A 19 (2004) 3439,hepph/0406204.
[11]S.Weinberg,Physica A 96 (1979) 327.
[12]J.Gasser and H.Leutwyler,Annals Phys.158 (1984) 142.
[13]J.Gasser and H.Leutwyler,Nucl.Phys.B 250 (1985)465.
[14]J.Gasser,M.E.Sainio,and A.Svarc,Nucl.Phys.B 307(1988) 779.
[15]Stefan Scherer and Matthias R.Schindler,hep-ph/0505-265.
[16]T.Fuchs,J.Gegelia,G.Japaridze,and S.Scherer,Phys.Rev.D 68 (2003) 056005.
[17]B.C.Lehnhart,J.Gegelia,and S.Scherer,J.Phys.G 31(2005) 89,hep-ph/0412092.
[18]Y.R.Liu,A.Zhang,P.Z.Huang,W.Z.Deng,X.L.Chen,and Shi-Lin Zhu,Phys.Rev.D 70 (2004) 094045,hepph/0404123.
[19]P.Ko,Jungil Lee,Taekoon Lee,and Jae-hyeon Park,Phys.Lett.B 611 (2005) 87-92,hep-ph/0312147.
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[21]Aneesh V.Manohar,hep-ph/9606222.
[22]J.Gasser and M.E.Sainio,hep-ph/0002283. 相似文献
3.
LI Xiao-Ya LU Xiao-Fu 《理论物理通讯》2006,46(4):704-710
Assuming that the recently θ+ and other exotic resonances belong to the pentaquark i0 of SU(3)I with J^P = 1/2, we constructed a relativistic effective lagrangian in the frame work of baryon chiral perturbation theory. The masses of pentaquarks under isospin symmetry is determined by calculating the propagator to one loop, where the extended on-mass-shell renormalization scheme is applied. Using the experimental data for masses of θ+, Ξ and N, we estimated the mass of Σ and the a terms. 相似文献
4.
Ulrich Mosel 《Acta Physica Hungarica A》2004,21(2-4):163-170
Changes of hadronic properties in dense nuclear matter as predicted by theory have usually been investigated by means of relativistic heavy-ion reactions. In this talk I show that observable consequences of such changes can also be seen in more elementary reactions on nuclei. Particular emphasis is put on a discussion of photonuclear reactions; examples are the dilepton production at ≈1 GeV and the hadron production in nuclei at 10–20 GeV photon energies. The observable effects are expected to be as large as in relativistic heavy-ion collisions and can be more directly related to the underlying hadronic changes. 相似文献
5.
6.
M. S. Bhagwat A. Höll A. Krassnigg C. D. Roberts S. V. Wright 《Few-Body Systems》2007,40(3-4):209-235
We examine the applicability and viability of methods to obtain knowledge about bound states from information provided solely
in Euclidean space. Rudimentary methods can be adequate if one only requires information about the ground and first excited
state and assumptions made about analytic properties are valid. However, to obtain information from Schwinger functions about
higher mass states, something more sophisticated is necessary. A method based on the correlator matrix can be dependable when
operators are carefully tuned and errors are small. This method is nevertheless not competitive when an unambiguous analytic
continuation of even a single Schwinger function to complex momenta is available. 相似文献
7.
L. Caneschi 《Physics letters. [Part B]》1979,84(2):237-240
A dynamical ansatz on the nature of the interaction that binds the constituents into physical hadrons makes it possible to compute perturbatively the spectrum and the quantum numbers of hadrons near the phase space boundary of a QCD jet. Nonperturbative effects are important for less extreme values of the momentum of the detected hadrons. They can be incorporated in the model using the algorithm of the jet calculus. 相似文献
8.
In these lectures I first give the motivation for investigations of in-medium properties of hadrons. I discuss the relevant
symmetries of QCD and how they might affect the observed hadron properties. I then discuss at length the observable consequences
of in-medium changes of hadronic properties in reactions with elementary probes, and in particular photons, on nuclei. Here
I put an emphasis on new experiments on changes of the σ- and ω-mesons in medium 相似文献
9.
LI Xiao-Ya LUE Xiao-Fu 《理论物理通讯》2006,46(6):1059-1064
In the frame work of chiral perturbation theory, a modified effective Lagrangian for meson-baryon system is constructed, where the SU(3) breaking effect for meson is considered. The difference between physical and chiral limlt decay constants is taken into account. Calculated to one 1ooi) at O(p^3), the sigma terms and strangeness contents of baryon octet are obtained. 相似文献
10.
11.
12.
LI Xiao-Ya 《理论物理通讯》2006,46(12)
[1]J.Gasser,H.Leutwyler,and M.E.Sainio,Phys.Lett.B 253 (1991) 252.
[2]John Ellis,Eur.Phys.J.A 24S2 (2005) 3,[arXive:hepph/0411369].
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[9]B.C.Lehnhart,J.Gegelia,and S.Scherer,J.Phys.G 31(2005) 89,[arXive:hep-ph/0412092].
[10]P.J.Ellis and K.Torikoshi,Phys.Rev.C 61 (1999)015205.
[11]Gerald E.Hite,William B.Kaufmann,and Richard J.Jacob,Phys.Rev.C 71 (2005) 065201.
[12]S.Weinberg,Physica A 96 (1979) 327.
[13]J.Gasser and H.Leutwyler,Nucl.Phys.B 250 (1985)465.
[14]J.Gasser,M.E.Sainio,and A.Svarc,Nucl.Phys.B 307(1988) 779.
[15]P.Papazoglou,D.Zschiesche,S.Schramm,J.SchaffnerBielich,H.St(o)cker,and W.Greiner,Phys.Rev.C 59(1999) 411.
[16]T.Fuchs and J.Gegelia,Phys.Rev.D 68 (2003) 056005. 相似文献
13.
Debades Bandyopadhyay 《Pramana》2006,66(5):817-825
We discuss β-equilibrated and charge neutral matter involving hyperons and {ie817-1} condensates within relativistic models.
It is observed that populations of baryons are strongly affected by the presence of antikaon condensates. Also, the equation
of state including {ie817-2} condensates becomes softer resulting in a smaller maximum mass neutron star 相似文献
14.
15.
T. Hatsuda 《Progress in Particle and Nuclear Physics》2009,62(2):349-358
The theoretical foundation of the in-medium hadron properties is discussed from the point of view of the QCD spectral functions. The dynamical models of in-medium hadrons proposed so far are also summarized. 相似文献
16.
We consider nonequilibrium phase transitions of a quark-gluon plasma into hadrons proceeding via deflagration and supersonic condensation. The possible existence of a third phase, i.e. plasma of constitutent quarks is taken into account. New equations of state for hadronic gas are used, which include the proper volume of particles in a thermodynamically consistent way. The yields of hadrons are calculated for various values of the baryon density of the quark-gluon plasma. 相似文献
17.
The properties of the D and D s charmed mesons in normal nuclear matter density are studied within a coupled channel approach using a t-channel vector-meson exchange mechanism as driving force. The in-medium scattering amplitudes are obtained by solving the Lippmann?CSchwinger equation including Pauli blocking effects and medium self-energies in a self-consistent way. 相似文献
18.
Bagan E. Dosch H. G. Gosdzinsky P. Narison S. Richard J. -M. 《Zeitschrift fur Physik C Particles and Fields》1994,64(1):57-71
Zeitschrift für Physik C Particles and Fields - By combining potential models and QCD spectral sum rules (QSSR), we discuss the spectroscopy of the $$(b\bar c)$$ mesons and of the (bcq), (ccq)... 相似文献
19.
兰州冷却储存环上可开展的强子物理研究 总被引:1,自引:0,他引:1
介绍了当前强子物理的研究现状和兰州冷却储存环的能量特点,以及国内强子物理专家的分析和建议。在兰州冷却储存环上,可利用中能轻离子束核反应产生强子激发态研究强子内部夸克态的结构和性质、强子性质随核环境的变化和手征对称破缺与部分恢复。尤其是通过兰州冷却储存环上限能区附近的P+P反应,研究奇异夸克的不对称性和形状因子,寻找超子激发态和pentaquark的实验证据,发现双重子态的实验事例。 According to both the development on badrons physics and the aspect of Lanzhou cooling storage ring (CSR) and based on the analysis and propositions given by experts in China, we propose some hadrons physics program at CSR. The hadron spectroscopy produced in light nucleus collisions at CSR used to probe the quark and gluon structure of hadrons, to study the modification of the hadron properties in nuclear matter and to investigate the spontaneous breaking of the chiral symmetry and its partial restoration. Especially, the proton-proton collisions at beam energies per proton below 2.8 GeV at CSR should be used to measure the strangeness asymmetry and strange form lector, to probe the existence of hyperon and pentaquarks and to find the evidence for the existence of dibaryon. 相似文献
20.
Alfred Actor 《Fortschritte der Physik》1976,24(9):507-528
An exploratory study of weak neutrino-lepton annihilation into hadrons, v̄l + l → hadrons is presented. Simple cross-section estimates indicate processes of this type may be observable in a large bubble chamber. We discuss the information one could hope to obtain from such experiments. General formulas for amplitudes and cross sections are given for v̄l + l → hadrons assuming a point-like V – A interaction. To establish tests of the V – A interaction, we recalculate the annihilation amplitudes assuming a point-like scalar-pseudoscalar or tensor-pseudotensor interaction. The extension to theories with intermediate vector bosons is sketched. We discuss the connection between v̄l + l → hadrons and e+e− → hadrons implied by the conserved vector current hypothesis. We note that in v̄l + l → rH, K⋆(890), A1, B creation (these reactions enjoy comparatively large cross sections) the leptonic as well as hadronic couplings of these J = 1 , I = 1/2 or 1 mesons could be determined. A related possibility is the direct creation of new heavy charged J = 1 mesons. The normal J = 1 resonance region could be explored with neutrino energies of the order 500–2000 GeV. For this, and for higher-energy work, a TeV proton accelerator is clearly necessary. 相似文献