skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: D mesons in nuclear matter: A DN coupled-channel equations approach

Abstract

A set of coupled two-body scattering equations is solved for the DN system embedded in an isosymmetric nuclear matter. The in-medium behavior of charmed D mesons (D{sup +},D{sup 0}), is investigated from the self-consistent solution within this scheme. The effective meson-baryon Lagrangian in charm quantum number one sector, the key ingredient in the present study, is adopted from a recent model by Hofmann and Lutz that has aimed at combining the charmed meson degree of freedom in a consistent manner with chiral unitary models. After a critical examination, the original model is modified in several important aspects, such as the method of regularization, to be more consistent and practical for our objective. The resultant interaction is used to reproduce the position and width of the s-wave {lambda}{sub c}(2593) resonance in the isospin zero DN channel. In the isospin one channel, it generates a rather wide resonance at {approx}2770 MeV. The corresponding in-medium solution is then sought by incorporating Pauli blocking and the D- and {pi}-meson dressing self-consistently. At normal nuclear matter density, the resultant {lambda}{sub c}(2593) is found to stay narrow and shifted at a lower energy, whereas the I=1 resonance is lowered in position as well and broadened considerably.

Authors:
 [1];  [2];  [1]
  1. Departament d'Estructura i Constituents de la Materia Universitat de Barcelona, Diagonal 647, 08028 Barcelona (Spain)
  2. (United States)
Publication Date:
OSTI Identifier:
20864235
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 74; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.74.065201; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CHIRALITY; COUPLED CHANNEL THEORY; D NEUTRAL MESONS; D PLUS MESONS; DEGREES OF FREEDOM; ISOSPIN; LAGRANGIAN FUNCTION; LAMBDA C-2625 BARYONS; MEV RANGE; NUCLEAR MATTER; PARTICLE INTERACTIONS; PARTICLE WIDTHS; PIONS; RESONANCE PARTICLES; S WAVES; SCATTERING; TWO-BODY PROBLEM

Citation Formats

Mizutani, T., Department of Physics, Virginia Polytechnic Institute and State University Blacksburg, Virginia 24061, and Ramos, A.. D mesons in nuclear matter: A DN coupled-channel equations approach. United States: N. p., 2006. Web. doi:10.1103/PHYSREVC.74.065201.
Mizutani, T., Department of Physics, Virginia Polytechnic Institute and State University Blacksburg, Virginia 24061, & Ramos, A.. D mesons in nuclear matter: A DN coupled-channel equations approach. United States. doi:10.1103/PHYSREVC.74.065201.
Mizutani, T., Department of Physics, Virginia Polytechnic Institute and State University Blacksburg, Virginia 24061, and Ramos, A.. Fri . "D mesons in nuclear matter: A DN coupled-channel equations approach". United States. doi:10.1103/PHYSREVC.74.065201.
@article{osti_20864235,
title = {D mesons in nuclear matter: A DN coupled-channel equations approach},
author = {Mizutani, T. and Department of Physics, Virginia Polytechnic Institute and State University Blacksburg, Virginia 24061 and Ramos, A.},
abstractNote = {A set of coupled two-body scattering equations is solved for the DN system embedded in an isosymmetric nuclear matter. The in-medium behavior of charmed D mesons (D{sup +},D{sup 0}), is investigated from the self-consistent solution within this scheme. The effective meson-baryon Lagrangian in charm quantum number one sector, the key ingredient in the present study, is adopted from a recent model by Hofmann and Lutz that has aimed at combining the charmed meson degree of freedom in a consistent manner with chiral unitary models. After a critical examination, the original model is modified in several important aspects, such as the method of regularization, to be more consistent and practical for our objective. The resultant interaction is used to reproduce the position and width of the s-wave {lambda}{sub c}(2593) resonance in the isospin zero DN channel. In the isospin one channel, it generates a rather wide resonance at {approx}2770 MeV. The corresponding in-medium solution is then sought by incorporating Pauli blocking and the D- and {pi}-meson dressing self-consistently. At normal nuclear matter density, the resultant {lambda}{sub c}(2593) is found to stay narrow and shifted at a lower energy, whereas the I=1 resonance is lowered in position as well and broadened considerably.},
doi = {10.1103/PHYSREVC.74.065201},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 74,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}
  • The shift of the p-wave D{sub s} meson mass due to coupling to the DK channel is calculated without fitting parameters using the chiral Lagrangian. As a result the original Q{bar q} mass 2.490 MeV generically calculated in the relativistic quark models is shifted down to the experimental value 2317 MeV. With the same Lagrangian the shift of the radial excited 1{sup -1} level is much smaller, while the total width {Gamma} > 100 MeV and the width ratio is in contradiction with the D*(2632) state observed by SELEX group.
  • The shift of the p-wave D{sub s} meson mass due to coupling to the DK channel is calculated using a QCD string model and the chiral Lagrangian. As a result the original Qq mass, 2.490 MeV, generically calculated in the relativistic quark models is shifted down to the experimental value 2317 MeV. With the same Lagrangian the shift of the radial excited 1{sup -} level is much smaller, while the total width {gamma}>100 MeV and the width ratio is in contradiction with the D*(2632) state observed by SELEX Collaboration.
  • The three-body mechanism of the reaction d(d, dN)N is investigated. It is assumed that, in the region of quasi-elastic kinematics, this mechanism plays a crucial role. This makes it possible to apply well-known theoretical methods to the analysis of this reaction. Specific calculations based on this assumption give results that are found to be consistent with experimental data. 20 refs., 1 fig.
  • A three-dimensional analysis of the dynamics of hydrogen isotopes confined within a metal lattice, like palladium or nickel, is presented. It is assumed that the concentration of the hydrogen isotopes, as an atomic fraction, is close to unity and that coherent oscillations of the metal atom electrons near to the Fermi level take place. Coherent oscillations of the Fermi-level electrons in the metal lattice can produce an oscillating electric field within the cell and hence produce a radio-frequency oscillation of ions like protons or deuterons. The trajectories of the ions can be studied by means of the equations of motion.more » The results show that under proper initial conditions, the closest distance of approach between two ions or between an ion and the nucleus of an atom of the host metal lattice can be reduced below 0.1 Angst. An evaluation of the excess of heat production has been done for the D-D reaction within a Pd lattice by approximating the reaction both to an s-wave and a d-wave process, respectively. Last, the effect of the lattice field, which causes the collisions between ions, on the nuclear reaction channel for the D-D reaction is investigated by evaluating the transition probability for a stimulated decay.« less