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pro vyhledávání: '"Pena, M. T"'
In recent years, it has become possible to measure not only the magnitude of the electric ($G_E$) and magnetic ($G_M$) form factors of spin $\frac{1}{2}$ baryons, but also to measure the relative phases of those quantities in the timelike kinematic r
Externí odkaz:
http://arxiv.org/abs/2407.21397
Autor:
Ramalho, G., Peña, M. T.
Publikováno v:
Prog.Part.Nucl.Phys. 136, 104097 (2024)
Recent experimental and theoretical advancements have led to significant progress in our understanding of the electromagnetic structure of nucleons ($N$), nucleon excitations ($N^\ast$), and other baryons. These breakthroughs have been made possible
Externí odkaz:
http://arxiv.org/abs/2306.13900
We report progress on calculations of the heavy-light baryons $\Sigma_c$ and $\Lambda_c$ and their excitations with $J^P = 1/2^+$ using functional methods. We employ a covariant quark-diquark approach, where the interaction amounts to a quark exchang
Externí odkaz:
http://arxiv.org/abs/2304.07393
Autor:
Ramalho, G., Peña, M. T.
Publikováno v:
Phys. Rev. D 101, 114008 (2020)
We develop a covariant model for the $\gamma^\ast N \to N(1535)$ transition in the timelike kinematical region, the region where the square momentum transfer $q^2$ is positive. Our starting point is the covariant spectator quark model constrained by
Externí odkaz:
http://arxiv.org/abs/2003.04850
Publikováno v:
Phys. Rev. D 101, 014014 (2020)
We present estimates of the hyperon elastic form factors for the baryon octet and the $\Omega^-$ baryon for large four-momentum transfer squared, $q^2$, in the timelike region ($q^2>0$). Experimentally, those form factors can be extracted from the $e
Externí odkaz:
http://arxiv.org/abs/1908.04864
Publikováno v:
Phys. Rev. D 100, 094001 (2019)
We employ a scalar model to exemplify the use of contour deformations when solving Lorentz-invariant integral equations for scattering amplitudes. In particular, we calculate the onshell 2 -> 2 scattering amplitude for the scalar system. The integral
Externí odkaz:
http://arxiv.org/abs/1907.05402
We present results for the quark mass function in Minkowski space calculated from an interaction kernel that consists of an effective one-gluon-exchange and a constant interaction. We analyze the gauge dependence of our results and compare them in th
Externí odkaz:
http://arxiv.org/abs/1904.07711
Publikováno v:
Phys. Rev. D 98, 114033 (2018)
We present first results for the quark mass function in Minkowski space in both the spacelike and timelike regions calculated from the same quark-antiquark interaction kernel used in the latest meson calculations using the Gross equation. This kernel
Externí odkaz:
http://arxiv.org/abs/1811.01003
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The masses and vertex functions of heavy and heavy-light mesons, described as quark-antiquark bound states, are calculated with the Covariant Spectator Theory (CST). We use a kernel with an adjustable mixture of Lorentz scalar, pseudoscalar, and vect
Externí odkaz:
http://arxiv.org/abs/1803.00519