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Measurement of the presence of $\mathrm{a}_1(1420)$ and $ω(782)$ in $τ^-\toπ^-π^-π^+ν_τ$ at Belle
by Andrei Rabusov, Daniel Greenwald, Stephan Paul
Submission summary
| Authors (as registered SciPost users): | Andrei Rabusov |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2405.19264v3 (pdf) |
| Date submitted: | 2024-11-27 08:57 |
| Submitted by: | Rabusov, Andrei |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 17th International Workshop on Tau Lepton Physics (TAU2023) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
We present preliminary results of a partial-wave analysis of $\tau^-\to\pi^-\pi^-\pi^+\nu_\tau$ using data from the Belle experiment at the KEKB $\mathrm{e}^+\mathrm{e}^-$ collider. We validate our model with a model-independent analysis. We see the $\mathrm{a}_1(1420)$ and a G-parity-violating $1^-[\omega(782)\pi]_\mathrm{P}$ wave in tauon decays. Our results will improve models used in simulation studies necessary for measuring the electric and magnetic dipole moments and Michel parameters of the $\tau$.
List of changes
-resonances are present and in what amounts is also poorly known. The
+resonances are present and in what amounts are also poorly known. The
-efficiency and purity without introducing significantly uneven
+the statistical precision of our results without introducing significantly uneven
-two hemispheres defined by the axis that minimizes the thrust of all
+two hemispheres defined by the thrust axis calculated using all
-center-of-momentum frame.
+$\Ppositron\Pelectron$ center-of-momentum frame.
-energies in the signal hemisphere be below \SI{480}{MeV}.
+energies in the signal hemisphere be below \SI{480}{MeV}, summing over
+photons with at least \SI{40}{MeV}.
-with spin $j$; $L$ is the total angular momentum of the three pions.
+with spin $j$, with $L$ the total angular momentum.
-\QMIPWA; this is their first sighting in tauon decay.
+\QMIPWA. This is their first sighting in tauon decay.