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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
This is not the latest submitted version.
Submission summary
| Authors (as registered SciPost users): | Andrei Rabusov |
| Submission information | |
|---|---|
| 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 | |
|---|---|
| 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
->
measuring how much of it is present in the decay
maximize efficiency and purity
->
maximize efficiency times purity
across the decay’s phase space
->
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
->
in the center-of-mometum frame of the electron-positron collisions
charges be consistent with being pions
->
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
->
, where L is the total angular momentum
letting the fit optimize their values
->
while allowing the fit to optimize their values
We free the 1- [(ππ)P π]P wave
->
We allow the contribution of 1 -[(ππ)P π]P wave to float freely
; this is their first sighting in tauon decay.
->
, which are their first sighting in tauon decay.
Recommendation
Ask for minor revision
Author: Andrei Rabusov on 2024-11-27 [id 5000]
(in reply to Report 1 by Swagato Banerjee on 2024-11-25)Dear Referee,
Thank you for reviewing the manuscript. We have updated the submission with some of the changes you have proposed, but for some changes we preferred our own formulation. Below you will find our response.
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
Our response: We have changed the text to fix the number mistake.
measuring how present it is in the decay
->
measuring how much of it is present in the decay
Our response: We prefer our original formulation.
maximize efficiency and purity
->
maximize efficiency times purity
Our change to "maximize the statistical precision or our results"
Our response: We have updated the text to be accurate to our optimization.
across the decay’s phase space
->
across the phase space of
τ
−
decays
Our response: We prefer our original formulation.
defined by the axis that minimizes the thrust of
->
defined by the axis that maximizes the thrust calculated using
Our change to "defined by the thrust axis calculated using all detected charged particles and photons"
Our response: we have updated the text.
not coming from e+ e +→ τ+ τ -
->
not coming from the e+ e- → τ +τ- process
Our response: We prefer our formulation.
in the center-of-momentum frame
->
in the center-of-mometum frame of the electron-positron collisions
Our change to "in the e+e- center-of-momentum frame"
Our response: We have update the text to specify "e+e-"
charges be consistent with being pions
->
charges are consistent with being pions
Our response: We keep our original text which correctly uses the subjunctive for a requirement.
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
Our response: We keep our original text which correctly uses the subjunctive for a requirement.
And we reduce the presence of neutral pions
->
And we reduce the number of neutral pions
Our response: We prefer our original text.
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.
-- add ", summing over photons with at least xxx MeV."
Our response: We keep the subjunctive, which is grammatically necessary for a requirement, and add the clause specifying the photon energy cutoff.
presence of the last would violate
->
presence of the latter would violate
Our response: We keep our text since only the last J^P (1-), not the latter (1+ and 1-), violates G parity.
with masses and widths the same as in the COMPASS
->
with masses and widths as in the COMPASS
Our response: We prefer our original formulation which avoids any possible misreading.
component described in [16]
->
component as described in [16]
Our response: We prefer our original text without the preposition.
Angular momentum up to
->
Difference in angular momentum up to
Our response: The sentence goes on to specify "between", so we prefer our original text without "difference".
; L is the total angular momentum
->
, where L is the total angular momentum
Our change to: ", with L the total angular momentum."
Our response: we have updated the text.
letting the fit optimize their values
->
while allowing the fit to optimize their values
Our response: we prefer our original text.
We free the 1- [(ππ)P π]P wave
->
We allow the contribution of 1 -[(ππ)P π]P wave to float freely
Our response: "Free" is intended to mean that we use QMIPWA. The formulation here could be improved to indicate that we use the QMIPWA method.
; this is their first sighting in tauon decay.
->
, which are their first sighting in tauon decay.
Our change to ". This is their first sighting in tauon decay."