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Measurement of the presence of a1(1420) and ω(782) in τ−→π−π−π+ντ 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: | scipost_202406_00027v1 (pdf) |
| Date submitted: | 2024-06-12 17:28 |
| 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 τ− → π− π+ π− ν τ using data from the Belle experiment at the KEKB e+ e− collider. We validate our model with a model-independent analysis. We see the a1 (1420) and a G-parity-violating 1− [ω(782) π]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 τ.
Current status:
Reports on this Submission
Report #1 by Swagato Banerjee (Referee 1) on 2024-11-25 (Invited Report)
Report
Preliminary results from a partial-wave analysis of τ → π π π ντ using data collected by the Belle experiment at the KEKB e+e- collider are presented.
The scientific quality of this contribution is very high.
Publication is recommended after minor corrections have been incorporated.
Requested changes
General comments: please remove line numbers for final submission.
What other resonances are present and in what amounts is also poorly known
->
What other resonances are present and in what amounts are (?) also poorly known
measuring how present it is in the decay
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measuring how much of it is present in the decay
maximize efficiency and purity
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maximize efficiency times purity
across the decay’s phase space
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across the phase space of $\tau^-$ decays
defined by the axis that minimizes the thrust of
->
defined by the axis that maximizes the thrust calculated using
not coming from e+ e +→ τ+ τ -
->
not coming from the e+ e- → τ +τ- process
in the center-of-momentum frame
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in the center-of-mometum frame of the electron-positron collisions
charges be consistent with being pions
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charges are consistent with being pions
in the signal hemisphere be more than 12 MeV from the known $K^0$
->
in the signal hemisphere is more than 12 MeV from the known $K^0_S$
And we reduce the presence of neutral pions
->
And we reduce the number of neutral pions
sum of photon energies in the signal hemisphere be below 480 MeV.
->
sum of photon energies in the signal hemisphere IS below 480 MeV,
where each photon is required to have at least an energy of xxx MeV.
presence of the last would violate
->
presence of the latter would violate
with masses and widths the same as in the COMPASS
->
with masses and widths as in the COMPASS
component described in [16]
->
component as described in [16]
Angular momentum up to
->
Difference in angular momentum up to
; L is the total angular momentum
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, where L is the total angular momentum
letting the fit optimize their values
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while allowing the fit to optimize their values
We free the 1- [(ππ)P π]P wave
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We allow the contribution of 1 -[(ππ)P π]P wave to float freely
; this is their first sighting in tauon decay.
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, which are their first sighting in tauon decay.
Recommendation
Ask for minor revision