تقرير
Fitting B/C cosmic-ray data in the AMS-02 era: A cookbook
| العنوان: | Fitting B/C cosmic-ray data in the AMS-02 era: A cookbook |
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| المؤلفون: | Derome, L., Maurin, D., Salati, P., Boudaud, M., Génolini, Y., Kunzé, P. |
| المصدر: | A&A 627, A158 (2019) |
| سنة النشر: | 2019 |
| المجموعة: | Astrophysics High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology |
| الوصف: | AMS-02 on the International Space Station has been releasing data of unprecedented accuracy. This poses new challenges for their interpretation. We refine the methodology to get a statistically sound determination of the cosmic-ray propagation parameters. We inspect the numerical precision of the model calculation, nuclear cross-section uncertainties, and energy correlations in data systematic errors. We used the 1D diffusion model in USINE. Our $\chi^2$ analysis includes a covariance matrix of errors for AMS-02 systematics and nuisance parameters to account for cross-section uncertainties. Mock data were used to validate some of our choices. We show that any mis-modelling of nuclear cross-section values or the energy correlation length of the covariance matrix of errors biases the analysis. It also makes good models ($\chi^2_{\rm min}/{\rm dof}\approx1$) appear as excluded ($\chi^2_{\rm min}/{\rm dof}\gg1$). We provide a framework to mitigate these effects (AMS-02 data are interpreted in a companion paper). New production cross-section data and the publication by the AMS-02 collaboration of a covariance matrix of errors for each data set would be an important step towards an unbiased view of cosmic-ray propagation in the Galaxy. Comment: 24 pages, 23 figures, 3 tables: affiliations corrected |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1051/0004-6361/201935717 |
| URL الوصول: | http://arxiv.org/abs/1904.08210 |
| رقم الأكسشن: | edsarx.1904.08210 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1051/0004-6361/201935717 |
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