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Cardarelli, F.; Simula, Silvano

doi:10.1103/physrevd.60.074018

Cited by 20 publications

(25 citation statements)

References 19 publications

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“…The comparison of our model predictions with other theoretical calculations [3,26,27,28,29,30,31,32] is given in Table VII. In nonrelativistic quark models [3,26,27] form factors of the heavy baryon decays are evaluated at the single kinematic point of zero recoil and then different form factor parameterizations (pole, dipole) are used for decay rate calculations.…”

Section: Discussionmentioning

confidence: 94%

“…In nonrelativistic quark models [3,26,27] form factors of the heavy baryon decays are evaluated at the single kinematic point of zero recoil and then different form factor parameterizations (pole, dipole) are used for decay rate calculations. The relativistic three-quark model [28], Bethe-Salpeter model [29] and lightfront constituent quark model [30] assume Gaussian wave functions for heavy baryons. The authors of the recent nonrelativistic quark model [31] use for the form factor evaluations the set of variational wave functions, obtained from baryon spectra calculations without employing the quark-diquark approximation.…”

Section: Discussionmentioning

confidence: 99%

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Semileptonic decays of heavy baryons in the relativistic quark model

2006

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Semileptonic decays of heavy baryons consisting of one heavy (Q = b, c) and two light (q = u, d, s) quarks are considered in the heavy-quark-light-diquark approximation. The relativistic quasipotential equation is used for obtaining masses and wave functions of both diquarks and baryons within the constituent quark model. The weak transition matrix elements are expressed through the overlap integrals of the baryon wave functions. The Isgur-Wise functions are determined in the whole accessible kinematic range. The exclusive semileptonic decay rates and different asymmetries are calculated with applying the heavy quark 1/m Q expansion. The evaluated Λ b → Λ c lν decay rate agrees with its experimental value.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Semileptonic decays of heavy baryons in the relativistic quark model

2006

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“…As it is well known (cf., e.g., Ref. [3]), the spin-flavour SU(6) symmetry predicts G n E (Q 2 ) = 0 and G…”

Section: Introductionmentioning

confidence: 99%

“…[6] has been recently derived from a relativistic calculation of the nucleon elastic e.m. form factors, performed within the light-front (LF ) formalism and the constituent quark (CQ) model [3]. Namely it has been shown that the zitterbewegung approximation of Ref.…”

Section: Introductionmentioning

confidence: 99%

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SU(6) breaking effects in the nucleon elastic electromagnetic form factors

2000

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The effects of both kinematical and dynamical SU (6) breaking on the nucleon elastic form factors, G N E (Q 2 ) and G N M (Q 2 ), are investigated within the constituent quark model formulated on the light-front. The investigation is focused on G n E (Q 2 ) and the ratio G p M (Q 2 )/G n M (Q 2 ), which within the SU (6) symmetry are given by G n E (Q 2 ) = 0 andIt is shown that the kinematical SU (6) breaking caused by the Melosh rotations of the quark spins as well as the dynamical SU (6) breaking due to the mixed-symmetry component generated in the nucleon wave function by the spin-dependent terms of the quark-quark interaction, can affect bothis found to be qualitatively consistent with existing data, though only ≃ 65% of the experimental neutron charge radius can be explained without invoking effects from possible non-vanishing sizes of the constituent quarks and/or many-body currents. At the same time the predictions for the magnetic ratio G p M (Q 2 )/G n M (Q 2 ) turn out to be inconsistent with the data. It is however shown that the calculations of G N M (Q 2 ) based on different components of the one-body electromagnetic current lead to quite different results. In particular, the calculations based on the plus component are found to be plagued by spurious effects related to the loss of the rotational covariance in the light-front formalism. These unwanted effects can be avoided by considering the transverse y-component of the current. In this way our light-front predictions are found to be consistent with the data on both G n E (Q 2 ) and GFinally, it is shown that a suppression of the ratio G p E (Q 2 )/G p M (Q 2 ) with respect to the dipole-fit prediction can be expected in the constituent quark model provided the relativistic effects generated by the Melosh rotations of the constituent spins are taken into account.

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Measuring c-quark polarization in W +c samples at ATLAS and CMS

Kats

2016

J. High Energ. Phys.

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Being able to measure the polarization of quarks produced in various processes at the LHC would be of fundamental significance. Measuring the polarizations of quarks produced in new physics processes, once discovered, can provide crucial information about the new physics Lagrangian. In a series of recent papers, we have investigated how quark polarization measurements can be done in practice. The polarizations of heavy quarks (b and c) are expected to be largely preserved in the lightest baryons they hadronize into, the Λ b and Λ c , respectively. Furthermore, it is known experimentally that s-quark polarization is preserved as well, in Λ baryons. We study how ATLAS and CMS can measure polarizations of b, c and s quarks using certain decays of these baryons. We propose to use the Standard Model tt and W c samples to calibrate these measurements. We estimate that the Run 2 dataset will suffice for measuring the quark polarizations in these Standard Model samples with precisions of order 10%. We also propose various additional measurements for the near and far future that would help characterize the polarization transfer from the quarks to the baryons.

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Analysis of theΛb→Λc+lν¯

Cited by 20 publications

References 19 publications

Semileptonic decays of heavy baryons in the relativistic quark model

Semileptonic decays of heavy baryons in the relativistic quark model

SU(6) breaking effects in the nucleon elastic electromagnetic form factors

Measuring c-quark polarization in W +c samples at ATLAS and CMS

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