A theory of scalar mesons

Hooft, Gerard ’t; Isidori, Gino; Maiani, L.; Polosa, A. D.; Riquer, V.

doi:10.1016/j.physletb.2008.03.036

Cited by 264 publications

(194 citation statements)

References 41 publications

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“…Alternatively, one can go through a mixing between the two isoscalars f 0 and σ. However, as discussed in [340], such mixing is expected to be too small, < 5…”

Section: B Light Mesonsmentioning

confidence: 99%

“…Alternatively one could annihilate the diquark and the antidiquark directly into a qq pair via a six-fermion interaction, not paying the price of breaking the diquark shells, and hadronize the two light quarks produced into two pions via a quark pair creation. This possibility is provided by six-fermion, instanton induced low energy vertices [340]. Such vertices contain a term of the form I = i,jq i q jqj q i , i, j being flavor indices and q iα = ijk αβγq jβ C γ 5 q kγ being a spin zero diquark.…”

Section: B Light Mesonsmentioning

confidence: 99%

See 1 more Smart Citation

SuperB Progress Report for Physics

O’Leary¹,

Aachen²,

Matias³

et al. 2012

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SuperB is a high luminosity e + e − collider that will be able to indirectly probe new physics at energy scales far beyond the reach of any man made accelerator planned or in existence. Just as detailed understanding of the Standard Model of particle physics was developed from stringent constraints imposed by flavour changing processes between quarks, the detailed structure of any new physics is severely constrained by flavour processes. In order to elucidate this structure it is necessary to perform a number of complementary studies of a set of golden channels. With these measurements in hand, the pattern of deviations from the Standard Model behavior can be used as a test of the structure of new physics. If new physics is found at the LHC, then the many golden measurements from SuperB will help decode the subtle nature of the new physics. However if no new particles are found at the LHC, SuperB will be able to search for new physics at energy scales up to 10 − 100 TeV. In either scenario, flavour physics measurements that can be made at SuperB play a pivotal role in understanding the nature of physics beyond the Standard Model. Examples for using the interplay between measurements to discriminate New Physics models are discussed in this document.SuperB is a Super Flavour Factory, in addition to studying large samples of B u,d,s , D and τ decays, SuperB has a broad physics programme that includes spectroscopy both in terms of the Standard Model and exotica, and precision measurements of sin 2 θ W . In addition to performing CP violation measurements at the Υ (4S) and φ(3770), SuperB will test CP T in these systems, and lepton universality in a number of different processes. The multitude of rare decay measurements possible at SuperB can be used to constrain scenarios of physics beyond the Standard Model. In terms of other precision tests of the Standard Model, this experiment will be able to perform precision over-constraints of the unitarity triangle through multiple measurements of all angles and sides.

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“…Alternatively, one can go through a mixing between the two isoscalars f 0 and σ. However, as discussed in [340], such mixing is expected to be too small, < 5…”

Section: B Light Mesonsmentioning

confidence: 99%

Section: B Light Mesonsmentioning

confidence: 99%

SuperB Progress Report for Physics

O’Leary¹,

Aachen²,

Matias³

et al. 2012

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“…Suggestions about a diquark-antidiquark structure of the light scalar mesons including f 0 ð980Þ one were made on the basis of new theoretical analysis in Refs. [10,11], as well.…”

Section: Introductionmentioning

confidence: 97%

New a1(1420) state: Structure, mass, and width

2018

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The structure, spectroscopic parameters and width of the resonance with quantum numbers J PC ¼ 1 þþ discovered by the COMPASS Collaboration and classified as the a 1 ð1420Þ meson are examined in the context of QCD sum rule method. In the calculations the axial-vector meson a 1 ð1420Þ is treated as a fourquark state with the diquark-antidiquark structure. The mass and current coupling of a 1 ð1420Þ are evaluated using QCD two-point sum rule approach. Its observed decay mode a 1 ð1420Þ → f 0 ð980Þπ, and kinematically allowed ones, namely a 1 → K ÃAE K ∓ , a 1 → K Ã0K0 and a 1 →K Ã0 K 0 channels are studied employing QCD sum rules on the light-cone. Our prediction for the mass of the a 1 ð1420Þ state m a 1 ¼ 1416

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“…They can be reached from a two-meson system without explicit orbital angular momentum, while through a simple cc pair it needs a unit of orbital angular momentum. Similar arguments were used to explain the proliferation of light scalar-isoscalar mesons [5,6,7]. The most attractive channel in the DD * case is the J PC (I) = 1 ++ (0) and can be explained as before, except 2)) that breaks the degeneracy to make the 1 ++ (0) more attractive.…”

mentioning

confidence: 86%