Person:
Fernández Ramírez, César

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First Name
César
Last Name
Fernández Ramírez
URI
https://hdl.handle.net/20.500.14352/86753
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Universidad Complutense de Madrid
Faculty / Institute
Ciencias Físicas
Department
Estructura de la Materia, Física Térmica y Electrónica
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Author: Retamosa Granado, Joaquín × Item Type: Publication ×

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Now showing 1 - 2 of 2
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    Chaos in hadrons
    (Journal of physics: Conference series, 2012) Muñoz, Laura; Fernández Ramírez, César; Relaño Pérez, Armando; Retamosa Granado, Joaquín
    In the last decade quantum chaos has become a well established discipline with outreach to different fields, from condensed-matter to nuclear physics. The most important signature of quantum chaos is the statistical analysis of the energy spectrum, which distinguishes between systems with integrable and chaotic classical analogues. In recent years, spectral statistical techniques inherited from quantum chaos have been applied successfully to the baryon spectrum revealing its likely chaotic behaviour even at the lowest energies. However, the theoretical spectra present a behaviour closer to the statistics of integrable systems which makes theory and experiment statistically incompatible. The usual statement of missing resonances in the experimental spectrum when compared to the theoretical ones cannot account for the discrepancies. In this communication we report an improved analysis of the baryon spectrum, taking into account the low statistics and the error bars associated with each resonance. Our findings give a major support to the previous conclusions. Besides, analogue analyses are performed in the experimental meson spectrum, with comparison to theoretical models.
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    Spectral-statistics properties of the experimental and theoretical light meson spectra
    (Physics Letters B, 2012) Muñoz, Laura; Fernández Ramírez, César; Relaño Pérez, Armando; Retamosa Granado, Joaquín
    We present a robust analysis of the spectral fluctuations exhibited by the light meson spectrum. This analysis provides information about the degree of chaos in light mesons and may be useful to get some insight on the underlying interactions. Our analysis unveils that the statistical properties of the light meson spectrum are close, but not exactly equal, to those of chaotic systems. In addition, we have analyzed several theoretical spectra including the latest lattice QCD calculation. With a single exception, their statistical properties are close to those of a generic integrable system, and thus incompatible with the experimental spectrum.