The decay τ → K∗0(892)K−ντ in the extended NJL model

Волков, М. К.; Пивоваров, А. А.; Nurlan, K.

doi:10.1142/s0217751x20500359

Cited by 7 publications

(9 citation statements)

References 51 publications

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“…What we see in Table 8 is that this decay is dominated by the b 1 excitation and the a 1 strength accounts for only 13%. Thus, assuming even 50% contribution of the vector current relative to the a 1 contribution, as in [56], only changes in 6% our calculation of these rates, and hence, the good agreement found is not surprising.…”

Section: Comparison With Experimentssupporting

confidence: 58%

“…The overwhelming dominance of the axial vector current in the V P production processes has been also corroborated in explicit calculations using the Nambu-Jona-Lasinio model in [18,[21][22][23]54,55]. One exception was found in [56] in the study of the τ − → ν τ K * 0 K − . In this work the vector current was as big as 50% of the axial vector current which was driven explicitly by the a 1 excitation.…”

Section: Comparison With Experimentsmentioning

confidence: 62%

“…Thus, we can claim an overall good agreement with the experimental branching ratios considering the assumptions we made. At this point we come back to the results of [56], where a large contribution from the vector current was obtained which is not considered in our approach. In spite of that we find a very good agreement of our results with experiment in the rates for K 0 K − π 0 and K − K + π − decays, which incidentally have the same strength both in the experiment and the theory.…”

Section: Comparison With Experimentsmentioning

confidence: 97%

“…In spite of that we find a very good agreement of our results with experiment in the rates for K 0 K − π 0 and K − K + π − decays, which incidentally have the same strength both in the experiment and the theory. The reason is that in [56] the source of the axial current is explicitly tied to the a 1 excitation, and the b 1 excitation is not explicitly considered. What we see in Table 8 is that this decay is dominated by the b 1 excitation and the a 1 strength accounts for only 13%.…”

Section: Comparison With Experimentsmentioning

confidence: 99%

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Tau decay into $$\nu _\tau $$ and $$a_1(1260)$$, $$b_1(1235)$$, and two $$K_1(1270)$$

2020

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We study the $$\tau \rightarrow \nu _\tau A$$ τ → ν τ A decay, with A an axial-vector meson. We produce the $$a_1(1260)$$ a 1 ( 1260 ) and $$b_1(1235)$$ b 1 ( 1235 ) resonances in the Cabibbo favored mode and two $$K_1(1270)$$ K 1 ( 1270 ) states in the Cabibbo suppressed mode. We take advantage of previous chiral unitary approach results where these resonances appear dynamically from the vector and pseudoscalar meson interaction in s-wave. Actually two different poles were obtained associated to the $$K_1(1270)$$ K 1 ( 1270 ) quantum numbers. We find that the unmeasured rates for $$b_1(1235)$$ b 1 ( 1235 ) production are similar to those of the $$a_1(1260)$$ a 1 ( 1260 ) and for the two $$K_1$$ K 1 states we suggest to separate the present information on the $$\bar{K} \pi \pi $$ K ¯ π π invariant masses into $$\bar{K}^* \pi $$ K ¯ ∗ π and $$\rho K$$ ρ K modes, the channels to which these two resonances couple most strongly, predicting that these modes peak at different energies and have different widths. These measurements should shed light on the existence of these two $$K_1$$ K 1 states. In addition, we have gone one step further making a comparison with experimental results of three meson decay channels, letting the vector mesons of our approach decay into pseudoscalars, and we find an overall good agreement with experiment.

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Section: Comparison With Experimentssupporting

confidence: 58%

Section: Comparison With Experimentsmentioning

confidence: 62%

Section: Comparison With Experimentsmentioning

confidence: 97%

Section: Comparison With Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

Tau decay into $$\nu _\tau $$ and $$a_1(1260)$$, $$b_1(1235)$$, and two $$K_1(1270)$$

2020

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“…Here the value M K 1A is determined in (117). This amplitude leads to the following value of the branching fraction:…”

Section: The Process τ → Kπν τmentioning

confidence: 99%

Low-energy interactions of mesons with participation of the first radially excited states in $U(3) \times U(3)$ NJL model

K.¹,

Pivovarov²,

Nurlan³

2022

Preprint

Self Cite

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The U (3) × U (3) chiral symmetric NJL model describing pseudoscalar, vector, and axial vector mesons in both the ground state and first radially excited states is shortly presented in this review. In this model, it is possible to describe a large number of low-energy interactions of mesons, τ lepton decays into mesons and processes of meson production in electron-positron annihilations in satisfactory agreement with the experiments. In describing a number of processes, it turned out to be necessary to take into account the interactions of mesons in the final state.

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Study of τ− → ωπ−ντ decay in resonance chiral theory with tensor sources

Chen,

Li,

Peng

et al. 2024

J. High Energ. Phys.

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In this work, we make a study of the τ− → ωπ−ντ decay in the framework of low-energy effective field theory. The $$ {J}^{\mathcal{P}G} $$ J P G decompositions of the quark currents and the ωπ final state show that, besides the Standard Model vector interaction, only the non-standard tensor interaction can have a non-zero contribution to the decay. To discuss its effect, a reliable calculation of the ωπ tensor form factors is necessary. After constructing the Lagrangian of resonance chiral theory with external tensor sources, we calculate both the vector and tensor form factors with the relevant resonance couplings determined by combining the QCD short-distance constraints, the fit to the spectral function of τ− → ωπ−ντ decay, as well as the matching between the $$ \mathcal{O}\left({p}^4\right) $$ O p 4 odd-intrinsic-parity operators after integrating out the vector resonances and the $$ \mathcal{O}\left({p}^6\right) $$ O p 6 operators of chiral perturbation theory. The new physics effect is then investigated in the distributions of the spectral function and the forward-backward asymmetry of τ− → ωπ−ντ decay. We find that the spectral function is dominated by the Standard Model, and the non-standard tensor contribution is negligible. However, since the forward-backward asymmetry can be only generated with a non-zero tensor interaction, the observable is quite sensitive to this kind of new physics. A future measurement of the observable at the Belle II experiment as well as at the proposed Tera-Z and STCF facilities is, therefore, strongly called for to check the existence of such a non-standard tensor interaction.

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The decay τ → K∗0(892)K−ντ in the extended NJL model

Cited by 7 publications

References 51 publications

Tau decay into $$\nu _\tau $$ and $$a_1(1260)$$, $$b_1(1235)$$, and two $$K_1(1270)$$

Tau decay into $$\nu _\tau $$ and $$a_1(1260)$$, $$b_1(1235)$$, and two $$K_1(1270)$$

Low-energy interactions of mesons with participation of the first radially excited states in $U(3) \times U(3)$ NJL model

Study of τ− → ωπ−ντ decay in resonance chiral theory with tensor sources

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