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Radiative corrections and Monte Carlo tools for low-energy hadronic cross sections in $e^+ e^-$ collisions
by Riccardo Aliberti, Paolo Beltrame, Ettore Budassi, Carlo M. Carloni Calame, Gilberto Colangelo, Lorenzo Cotrozzi, Achim Denig, Anna Driutti, Tim Engel, Lois Flower, Andrea Gurgone, Martin Hoferichter, Fedor Ignatov, Sophie Kollatzsch, Bastian Kubis, Andrzej Kupść, Fabian Lange, Alberto Lusiani, Stefan E. Müller, Jérémy Paltrinieri, Pau Petit Rosàs, Fulvio Piccinini, Alan Price, Lorenzo Punzi, Marco Rocco, Olga Shekhovtsova, Andrzej Siódmok, Adrian Signer, Giovanni Stagnitto, Peter Stoffer, Thomas Teubner, William J. Torres Bobadilla, Francesco P. Ucci, Yannick Ulrich, Graziano Venanzoni
Submission summary
| Authors (as registered SciPost users): | Andrea Gurgone · Adrian Signer |
| Submission information | |
|---|---|
| Preprint Link: | https://arxiv.org/abs/2410.22882v2 (pdf) |
| Code repository: | https://radiomontecarlow2.gitlab.io/ |
| Data repository: | https://zenodo.org/records/13928140 |
| Date submitted: | 2024-12-05 09:31 |
| Submitted by: | Signer, Adrian |
| Submitted to: | SciPost Physics Reviews |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Experimental, Phenomenological |
Abstract
We present the results of Phase I of an ongoing review of Monte Carlo tools relevant for low-energy hadronic cross sections. This includes a detailed comparison of Monte Carlo codes for electron-positron scattering into a muon pair, pion pair, and electron pair, for scan and radiative-return experiments. After discussing the various approaches that are used and effects that are included, we show differential cross sections obtained with AfkQed, BabaYaga@NLO, KKMC, MCGPJ, McMule, Phokhara, and Sherpa, for scenarios that are inspired by experiments providing input for the dispersive evaluation of the hadronic vacuum polarisation.
Current status:
Reports on this Submission
Strengths
This is important to review and list the programs which may be useful for experimental data analysis as well as list people involved in program development or just managing codes.
Collecting short descriptions of the codes and their comparisons can be helpful for the comunity
Weaknesses
1-, general theoretical introduction is missing.:
2-,In particular what is the relation between vacuum polarization and bremsstrahlung. It should be mentioned, including comments on dispersion relations, especially in context of effects beyond first order.
3-, Logarithms (at least some of them) appear from phase space integration over the regions of detector sensitivity. This should be mentioned and consequences for observable build indicated. Especially for the one involving detector granularity. Known since long limitations of fixed order calculations (cancelation of infrared virtual and real emission infinities, should be at least mentioned and better explained.
4-, these are the most important points. Some recall of references, in particular to work of Denner should be mentioned in context of general principles of use of dispersion relations and separation of predictions for QED and hard interaction part (effectively running of alpha_QED). Some of this is covered in programs descriptions. It would be OK to list the topics and write that every program has the issues covered by the authors.
5-) It would be nice if authors of individual programs contributions would
extend descriptions of their theoretical basis, but I would not expect this to be possible.
Report
After modifications and statement that responsibility of particular overall ambiguities has to be consulted with the authors of individual programs contributions, and that in general ambiguities are bound to be observable dependent, report may be accepted.
Requested changes
1.) see point 1 of weakness
2.) see point 2 of weakness
3.) see point 3 of weakness
4.) see point 4 of weakness
Recommendation
Ask for major revision