Baryon semileptonic decays: the Mexican contribution

Flores‐Mendieta, Rubén; Martinez, A.J.

doi:10.1063/1.2359389

Cited by 4 publications

(7 citation statements)

References 15 publications

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“…This fact causes no surprise. Previous works have shown this matching for baryon masses [41,46] and axial-vector couplings [37] in a systematic way.…”

Section: Comparison With Conventional Heavy Baryon Chiral Perturbasupporting

confidence: 55%

“…The singlet piece of M k loop 2 yields magnetic moments that satisfy the Coleman-Glashow relations (16) whereas violations to them are due to the 8 and 27 pieces. Their effects can be better seen in the sum rules (44)- (46), which are no longer satisfied at this order. We shall not write down the resulting expressions because they can be obtained without trouble by reading off the matrix elements of the corresponding operators displayed in Tables I-XI. We also notice that, for decuplet baryons, the analogs of Eqs.…”

Section: Total Contribution Ofmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of baryon magnetic moments in large-N[sub c] chiral perturbation theory

Flores‐Mendieta¹

2010

AIP Conference Proceedings

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The baryon magnetic and transition magnetic moments are computed in heavy baryon chiral perturbation theory in the large-Nc limit, where Nc is the number of colors. One-loop nonanalytic corrections of orders m 1/2 q and mq ln mq are incorporated into the analysis, where contributions of both intermediate octet and decuplet baryon states are explicitly included. Expressions are obtained in the limit of vanishing baryon mass differences and compared with the current experimental data. Furthermore, a comparison with conventional heavy baryon chiral perturbation theory is carried out for three light quarks flavors and at the physical value Nc = 3.1/2 q and m q ln m q . Caldi and Pagels [16] focused on calculating what were supposed to be the leading corrections, namely, those of order m 1/2 s , and concluded that, in general, the corrections turned out to be at least as large as the zeroth-order contribution so that the perturbation expansion would break down. In turn, Gasser et. al. [17] reanalyzed

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“…This fact causes no surprise. Previous works have shown this matching for baryon masses [41,46] and axial-vector couplings [37] in a systematic way.…”

Section: Comparison With Conventional Heavy Baryon Chiral Perturbasupporting

confidence: 55%

Section: Total Contribution Ofmentioning

confidence: 99%

Analysis of baryon magnetic moments in large-N[sub c] chiral perturbation theory

Flores‐Mendieta¹

2010

AIP Conference Proceedings

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“…The present status of this form factor can be inferred from the calculation in [33] using resonance chiral perturbation theory and from the calculation in [34] which presented a quenched lattice calculation of the order p 6 corrections. |V us | can be also determined from hyperon decays [35,36]. Another recent proposal has been to use the lattice QCD determination of f K /f π [37,38].…”

Section: Results and Conclusionmentioning

confidence: 99%

Extraction of and from Hadronic Tau Decays

Gámiz¹,

Jamin²,

Pich³

et al. 2005

Nuclear Physics B - Proceedings Supplements

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We review recent work to determine the strange quark mass m s as well as the proposal to determine |V us | using hadronic τ decay data. The recent update of the strange spectral function by OPAL and their moments of the invariant mass distribution are employed. Our results are |V us | = 0.2208 ± 0.0034 and m s (2 GeV) = 81± 22 MeV. Our result is already competitive to the standard extraction of |V us | from K e3 decays and to the new proposals to determine it. The error on |V us | is dominated by experiment and will be eventually much improved by the B-factories hadronic τ data. Ultimately, a simultaneous fit of both m s and |V us | to a set of moments of the hadronic τ decays invariant mass distribution will provide one of the most accurate determinations of these Standard Model parameters.

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“…1 that there are many publications for radiative correction calculations of hyperon and meson semileptonic decays (Refs. [3][4][5][6][38][39][40][41][42][43][44][45][46][47][48][49][50]). Most of these publications use also analytical or semianalytical integration methods for the bremsstrahlung correction calculations.…”

Section: The Bremsstrahlung Photon Integralmentioning

confidence: 99%

“…After the critical publications of Tóth et al, from the end of the eighties the radiative correction calculations for hyperon semileptonic decays (Refs. [38][39][40][41][42][43]) and for K meson semileptonic decays (Refs. [44][45][46][47][48][49][50]) have been using the correct recoil-type integration methods (this list of radiative correction publications is far from complete).…”

Section: Introductionmentioning

confidence: 99%

Radiative corrections to neutron and nuclear $β$-decays: a serious kinematics problem in the literature

Glück¹

2022

Preprint

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We report a serious kinematics problem in the bremsstrahlung photon part of the order-α outer (model independent) radiative correction calculations for those neutron (and nuclear beta) decay observables (like electron-neutrino correlation parameter measurement) where the proton (recoil particle) is detected. The so-called neutrino-type radiative correction calculations, which fix the neutrino direction in the bremsstrahlung photon integrals, use 3-body decay kinematics to connect the unobserved neutrino direction with the observed electron and proton (recoil particle) momenta. But the presence of the bremsstrahlung photon changes the kinematics from 3-body to 4-body one, and the accurate information about the recoil particle momentum is lost due to the integration with respect to the photon momentum. Therefore the application of the abovementioned 3-body decay kinematics connection for the radiative correction calculations, rather prevalent in the literature, is not acceptable. We show that the correct, so-called recoil-type radiative correction calculations, which fix the proton (recoil particle) momentum instead of the neutrino direction and use rather involved analytical, semianalytical or Monte Carlo bremsstrahlung integration methods, result usually in much larger corrections than the incorrect neutrino-type analytical methods.

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Baryon semileptonic decays: the Mexican contribution

Cited by 4 publications

References 15 publications

Analysis of baryon magnetic moments in large-N[sub c] chiral perturbation theory

Analysis of baryon magnetic moments in large-N[sub c] chiral perturbation theory

Extraction of and from Hadronic Tau Decays

Radiative corrections to neutron and nuclear $β$-decays: a serious kinematics problem in the literature

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