Radiative Transitions In Charmonium From Lattice Qcd PDF Download
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Download Radiative Transitions in Charmonium from Lattice QCD. Book in PDF, ePub and Kindle
Radiative transitions between charmonium states offer an insight into the internal structure of heavy-quark bound states within QCD. We compute, for the first time within lattice QCD, the transition form-factors of various multipolarities between the lightest few charmonium states. In addition, we compute the experimentally unobservable, but physically interesting vector form-factors of the [eta]{sub c}, J/[psi] and [chi]{sub c0}. To this end we apply an ambitious combination of lattice techniques, computing three-point functions with heavy domain wall fermions on an anisotropic lattice within the quenched approximation. With an anisotropy [xi] = 3 at a{sub s} ≈ 0.1 fm we find a reasonable gross spectrum and a hyperfine splitting ≈90 MeV, which compares favorably with other improved actions. In general, after extrapolation of lattice data at non-zero Q2 to the photopoint, our results agree within errors with all well measured experimental values. Furthermore, results are compared with the expectations of simple quark models where we find that many features are in agreement; beyond this we propose the possibility of constraining such models using our extracted values of physically unobservable quantities such as the J/[psi] quadrupole moment. We conclude that our methods are successful and propose to apply them to the problem of radiative transitions involving hybrid mesons, with the eventual goal of predicting hybrid meson photoproduction rates at the GlueX experiment.
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Release | : 2009 |
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Download Exotic and Excited-state Radiative Transitions in Charmonium from Lattice QCD. Book in PDF, ePub and Kindle
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Release | : 2007 |
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Download Radiative Charmonium Physics from Lattice QCD. Book in PDF, ePub and Kindle
Charmonium is an attractive system for the application of lattice QCD methods owing to the possibility of computing with the physical quark mass in a reasonable time. While the sub-threshold spectrum has been considered in some detail in previous works, it is only very recently that further properties such as radiative transitions and two-photon decays have come to be calculated; herein we discuss this recent progress.
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Release | : 2007 |
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Download Charmonium from Lattice QCD. Book in PDF, ePub and Kindle
Charmonium is an attractive system for the application of lattice QCD methods. While the sub-threshold spectrum has been considered in some detail in previous works, it is only very recently that excited and higher-spin states and further properties such as radiative transitions and two-photon decays have come to be calculated. I report on this recent progress with reference to work done at Jefferson Lab.
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Release | : 2009 |
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Download Excited Charmonium Physics from Lattice QCD. Book in PDF, ePub and Kindle
Properties of excited mesons are studied using a lattice QCD simulation of a system comparable to charmonium. We extract a spectrum of states, including those with manifestly exotic quantum numbers. Radiative transition form-factors are also computed, in particular the transition from exotic ·c1 to J /È 3 which is found to be large on the usual scale of magnetic dipole transitions.
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Total Pages | : 1512 |
Release | : 2010 |
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Download Exotic and Excited-state Meson Spectroscopy and Radiative Transitions from Lattice QCD. Book in PDF, ePub and Kindle
We discuss recent progress in extracting the excited meson spectrum and radiative transition form factors using lattice QCD. We mention results in the charmonium sector, including the first lattice QCD calculation of radiative transition rates involving excited charmonium states, highlighting results for high spin and exotic states. We present recent results on a highly excited isovector meson spectrum from dynamical anisotropic lattices. Using carefully constructed operators we show how the continuum spin of extracted states can be reliably identified and confidently extract excited states, states with exotic quantum numbers and states of high spin. This spectrum includes the first spin-four state extracted from lattice QCD. We conclude with some comments on future prospects.
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Release | : 2014 |
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Download Charmonium Meson and Hybrid Radiative Transitions Book in PDF, ePub and Kindle
We consider the non-relativistic limit of the QCD Hamiltonian in the Coulomb gauge, to describe radiative transitions between conventional charmonium states and from the lowest multiplet of cc ̄ hybrids to charmonium mesons. The results are compared to potential quark models and lattices calculations.
Author | : Gabriela Bailas |
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Total Pages | : 0 |
Release | : 2018 |
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Download Aspects of Charmonium Physics in Lattice QCD Book in PDF, ePub and Kindle
Charmonium states provide a relevant source of knowledge for determining fundamental parameters of the Standard Model. An important aspect of understanding Quantum ChromoDynamics (QCD) is to make precise predictions of the hadron spectrum and to test them against high-quality experimental data. Our theoretical framework is Lattice QCD, which is considered to be the only known way to treat the full QCD Lagrangian non perturbatively from first principles, in a manner well suited to numerical computation. By using the Wilson-Clover action with N_f = 2 dynamical flavors, we will study the two charmonium mesons eta_c and J/ psi. We will also investigate some properties of their first radial excitations eta_c(2S) and psi(2S).
Author | : Marvin L. Marshak |
Publisher | : American Institute of Physics |
Total Pages | : 1010 |
Release | : 2010-01-11 |
Genre | : Science |
ISBN | : 9780735407237 |
Download 10th Conference on the Intersections of Particle and Nuclear Physics Book in PDF, ePub and Kindle
CIPANP 2009 explores areas of common interest between nuclear physicists, high energy (particle) physicists and astrophysicists. These areas range from studies of the strong interactions that bind nuclei together to physics of the very early Universe and include such topics as neutrinos, hadron physics, spin physics, heavy ion physics, QCD and heavy flavor physics. The Conference papers include descriptions of searches for "new physics", phenomena that cannot be accounted for by current theories.
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Total Pages | : 94504 |
Release | : 2008 |
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Download Charmonium in Lattice QCD and the Non-relativistic Quark Model Book in PDF, ePub and Kindle
We compare the results of a numerical lattice QCD calculation of the charmonium spectrum with the structure of a general non-relativistic potential model. To achieve this we form the non-relativistic reduction of derivative-based fermion bilinear interpolating fields used in lattice QCD calculations and compute their overlap with $c\bar{c}$ meson states at rest constructed in the non-relativistic quark model, providing a bound-state model interpretation for the lattice data. Essential gluonic components in the bound-states, usually called hybrids, are identified by considering interpolating fields that involve the gluonic field-strength tensor and which have zero overlap onto simple $c\bar{c}$ model states.