4,514 research outputs found

    SPQR -- Spectroscopy: Prospects, Questions & Results

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    Tremendous progress has been made in mapping out the spectrum of hadrons over the past decade with plans to make further advances in the decade ahead. Baryons and mesons, both expected and unexpected, have been found, the results of precision experiments often with polarized beams, polarized targets and sometimes polarization of the final states. All these hadrons generate poles in the complex energy plane that are consequences of strong coupling QCD. They reveal how this works.Comment: 6 pages, 3 figures. The opening talk at the 13th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2013), Rome, September 30th-October 4th, 201

    Light O++O^{++} Mesons: Scalargators in Florida

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    Light scalar mesons abound in hadron processes, like the alligators in the Florida Everglades. Moreover, scalars are intimately tied to the vacuum structure of QCD. They are the product of many decays. Consequently, a rich source of recent information about them has come from experiments producing heavy flavour mesons. Indeed, scalars will continue to dominate many of the processes to be studied at forthcoming facilities like BESIII in Beijing, FAIR at GSI Darmstadt and the GlueX experiment at JLab, making an understanding (or at least an excellent and theoretically consistent description) essential for the physics missions of these facilities.Comment: 10 pages, 11 figures. Invited review at XIII International Conference on Hadron Spectroscopy, November 29-December 4, 2009, Florida State University, Tallahasse

    Impressions of the Meson Spectrum: Hybrids & Exotics, present and future

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    It has long been expected that the spectrum of hadrons in QCD would be far richer and extensive than experiment has so far revealed. While there have been experimental hints of this richness for some time, it is really only in the last few years that dramatic progress has been seen in the exploration both experimentally and in calculations on the lattice. Precision studies enabled by new technology both with detectors and high performance computations are converging on an understanding of the spectrum in strong coupling QCD. These methodologies are laying the foundation for a decade of potential discovery that electro and photoproduction experiments at Jefferson Lab, which when combined with key results on BB and charmonium decays from both e+ee^+e^- and pppp colliders, should turn mere impressions of the light meson spectrum into a high definition picture.Comment: 9 pages, 7 figure

    Understanding the baryon and meson spectra

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    A brief overview is given of what we know of the baryon and meson spectra, with a focus on what are the key internal degrees of freedom and how these relate to strong coupling QCD. The challenges, experimental, theoretical and phenomenological, for the future are outlined, with particular reference to a program at Jefferson Lab to extract hadronic states in which glue unambiguously contributes to their quantum numbers.Comment: 10 pages, 5 figures. Invited talk at the Eleventh Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2012), St Petersburg, Florida. May29-June 3, 201