Bulletin of the American Physical Society
2005 2nd Joint Meeting of the Nuclear Physics Divisions of the APS and The Physical Society of Japan
Sunday–Thursday, September 18–22, 2005; Maui, Hawaii
Session BJ: Hadronic Physics: Theory |
Hide Abstracts |
Sponsoring Units: DNP JPS Chair: Carl Carlson, College of William and Mary Room: Ritz-Carlton Hotel Hawaii |
Monday, September 19, 2005 7:00PM - 7:15PM |
BJ.00001: $\Delta I = 3/2$ kaon weak matrix elements with non-zero total momentum lattice Takeshi Yamazaki We present preliminary results for $\Delta I = 3/2$ kaon decay matrix elements, which is related to CP violation parameter $\varepsilon^{'}/\varepsilon$, with lattice QCD using domain wall fermions and the DBW2 gauge action at one coarse lattice spacing corresponding to $a^{-1} = 1.3$ GeV. We calculate the elements including two-pion final state interaction on lattice in the non-zero total momentum system, and extract the infinite volume, center-of-mass system decay amplitudes. For extracting the amplitudes, we employ an extension of the Lellouch and L\"uscher formula for non-zero total momentum. We compare the result with our previous result calculated with H-parity boundary conditions. We also show the $I=2$ $\pi\pi$ scattering phase shift and scattering length. [Preview Abstract] |
Monday, September 19, 2005 7:15PM - 7:30PM |
BJ.00002: In-medium $\pi \pi$ correlation induced by partial restoration of chiral symmetry Daisuke Jido, Tetsuo Hatsuda, Teiji Kunihiro We show that both the linear and nonlinear chiral models give an enhancement of the $\pi \pi$ cross section near the two-pion threshold in the scalar-isoscalar channel in nuclear matter. The reduction of the chiral condensate, i.e. the partial chiral restoration in nuclear matter, is responsible for the enhancement in both cases. We conclude that proper wavefunction renormalization is essential for consistent treatment in the nonlinear chiral model. [Preview Abstract] |
Monday, September 19, 2005 7:30PM - 7:45PM |
BJ.00003: I=2 pi-pi Scattering from lattice QCD Martin Savage I present the results of a fully-dynamical mixed-action lattice QCD calculation of pi-pi scattering for pions of mass ~294, 348 and 491 MeV. [Preview Abstract] |
Monday, September 19, 2005 7:45PM - 8:00PM |
BJ.00004: Coupled QCD sum rules for positive and negative-baryon resonances Yoshihiko Kondo, Osamu Morimatsu, Tetsuo Nishikawa, Yoshiko Kanada-En'yo A new approach of the QCD sum rule is proposed in which positive and negative-parity baryons couple with each other. With positive and negative-parity states explicitly taken into account, sum rules are derived by means of the dispersion relation in energy. The method is applied to the nucleon channel and the parity splitting of the nucleon resonance states is studied. It is found that the obtained sum rules have a very good Borel stability. This suggests that the ansatz for the spectral function in the present sum rule approximates the physical spectrum better than the usual lowest pole plus continuum ansatz. The predicted masses of the positive and negative nucleons reproduce the experimental ones fairly well. Especially, the mass difference is extremely close to the experimental value. The other baryon channels are also studied. [Preview Abstract] |
Monday, September 19, 2005 8:00PM - 8:15PM |
BJ.00005: Isospin breaking of baryon masses from domain-wall lattice QCD Takumi Doi, Tom Blum, Masashi Hayakawa, Taku Izubuchi, Norikazu Yamada In this talk, we present the domain-wall lattice QCD study of the isospin breaking effect on baryon masses, such as proton/neutron mass difference. Using two-flavor dynamical QCD configurations and quenched QED configurations, we study the electromagnetic splitting for baryons. We also explore the strong isospin breaking using the difference of mass between up and down quark as inputs which are determined by meson mass spectroscopy. [Preview Abstract] |
Monday, September 19, 2005 8:15PM - 8:30PM |
BJ.00006: Light scalar meson nonet at finite density Makoto Takizawa, Makoto Oka, Hideko Nagahiro, Satoru Hirenzaki The observed mass spectrum of the light scalar meson nonet seems not to fit the pattern of the flavor $SU(3)$ if one assumes the simple quark-antiquark structure of the scalar mesons. Without introducing the multi-quark structure of the scalar mesons, this problem has partially been solved by the effect of the $U_A(1)$ breaking instanton induced interaction. About 150 MeV mass difference between the $f_0(600)$ and $a_0(980)$ has been obtained in the study of the three flavor version of the Nambu-Jona-Lasinio (NJL) model where the strength of the $U_A(1)$ breaking interaction is determined by the electromagnetic decays of the $\eta$ meson. Since the low-lying scalar mesons are considered as the chiral partner of the Goldstone bosons ($\pi$, $K$, $\eta$), it is interesting to see how the properties of the light scalar meson nonet change at the finite density where the chiral symmetry is partially restored. We shall report the results of our study of the light scalar nonet at the finite density in the three-flavor NJL model. [Preview Abstract] |
Monday, September 19, 2005 8:30PM - 8:45PM |
BJ.00007: The Kaon B-parameter from Lattice QCD Christopher Dawson The calculation of the Kaon B-parameter is discussed. In particular the use of the Domain Wall Fermion approach to lattice QCD, with preliminary results from the first calculation using 2+1 flavours of dynamical Domain Wall Fermions being presented. [Preview Abstract] |
Monday, September 19, 2005 8:45PM - 9:00PM |
BJ.00008: The two Nucleon States in the Chiral Quark-Diquark Model Keitaro Nagata, Atsushi Hosaka We study the ground and first excited states of nucleons in a chiral quark-diquark model. We include two quark-diquark channels of the scalar-isoscalar and axialvector-isovector types for the nucleon states. The diquark correlation violate the spin-flavor SU(4) symmetry, generating a nucleon excited state which does not appear in the ordinary quark model in the SU(4) limit. With a reasonable choice of model parameters, the mass of the excited state appears at around 1.5 GeV, which may be identified with the Roper resonance $N(1440)$. [Preview Abstract] |
Monday, September 19, 2005 9:00PM - 9:15PM |
BJ.00009: B$_c$ absorption cross sections by mesons Rian Marshall, M.A.K. Lodhi The B$_c$ absorption cross sections by $\pi$ and $\rho$ mesons have been examined using gauged SU5 Lagrangian in meson exchange model. Hadron structures have been taken into account by including monopole form-factors. The cross sections peak at threshold energies in the same ranges as those in case of nucleons, calculated earlier. [Preview Abstract] |
Monday, September 19, 2005 9:15PM - 9:30PM |
BJ.00010: Dibaryons with $S=-1$ in the bound kaon approach to the Skyrme model Tetsuo Nishikawa, Yoshihiko Kondo Dibaryons with strangeness=-1 are studied in the framework of the bound kaon approach to the Skyrme-soliton model. We explore the possibility of kaon bound states in a SU(2) Skyrmion background field with B=2, where B denotes the baryon number. The kaon binding energy and the total energy are calculated in kaon-nucleon-nulceon channels. We particularly study the $ppK^-$ system, which was predicted to exist as a deeply bound kaonic nucleus by Akaishi and Yamazaki. We will also study the dependence of the kaon binding energy on the distance between the two Skyrmions, and the baryon number density distribution. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700