12-23 July 2021
Online
Europe/Berlin timezone

New methods to reconstruct Xmax and the energy of gamma-ray air showers with high accuracy in large wide-field observatories

13 Jul 2021, 12:00
1h 30m
04

04

Talk GAI | Gamma Ray Indirect Discussion

Speaker

Ruben Conceição (LIP - Laboratório de Instrumentação e Física Experimental de Partículas)

Description

A new method to reconstruct the slant depth of the maximum of the longitudinal profile (XmaxXmax​) of high-energy showers initiated by gamma-rays as well as their energy (E0​) are presented. The method were developed for gamma rays with energies ranging from a few hundred GeV to around 10 TeV. An estimator of Xmax is obtained, event-by-event, from its correlation with the distribution of the particles' arrival time at the ground, or the signal at the ground for lower energies. An estimator of E0​ is obtained, event-by-event, using a parametrization that has as inputs the total measured energy at the ground, the amount of energy contained in a region near to the shower core and the estimated Xmax​. Resolutions about 40 (20) g/cm2 and about 30(20)% for, respectively, Xmax​ and E0​ at 1 (10) TeV energies are obtained, considering vertical showers. The obtained results are auspicious and can lead to the opening of new physics avenues for large wide field-of-view gamma-ray observatories. The dependence of the resolutions with experimental conditions is discussed.

Keywords

Very high energy gamma-ray; Wide-field observatory; Energy reconstruction

Subcategory Experimental Methods & Instrumentation

Primary authors

Mário Pimenta (LIP/IST) Ruben Conceição (LIP - Laboratório de Instrumentação e Física Experimental de Partículas) Laura Peres (LIP) Bernardo Tomé

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