[Todos] Hoy a las 14hs aula de seminarios: Germán Gomez-Vargas, TNPP Group visitor's seminar

[Daniel LOPEZ]

Hola a todos,


Recuerden que hoy a las 14 hs tenemos el gusto de tener a Germán 
Gomez-Vargas con  las últimas novedades del satélite Fermi. La charla 
será en castellano.

Título de la charla de Germán: Gamma-ray line searches with the 
Fermi-LAT telescope

Abstract:    Dark matter decay or annihilation may produce monochromatic 
signals in the gamma-ray energy range. In this presentation I will argue 
that there are strong theoretical motivations for studying these signals 
in the framework of gravitino dark matter decay and present the results 
of a search for gamma-ray spectral lines from 100 MeV to 10 GeV with 5.2 
years of Fermi-LAT data. In contrast to previous line searches at higher 
energies, the sensitivity of the present search is dominated by 
systematic uncertainties across most of the energy range considered. We 
estimate the size of systematic effects by analysing the flux from a 
number of control regions, and include the systematic uncertainties 
consistently in our fitting procedure. I will also present preliminary 
results on a line search in a broad energy range 200 MeV - 500 GeV, the 
main improvement relative to previous works is the use of 5.8 years of 
data reprocessed with the Pass 8 event-level analysis. In addition I 
will present new results on the previously reported tentative detection 
of a line at 133 GeV using the new Pass 8 data.


Más información sobre las charlas la pueden encontrar en mi página web, 
http://users.df.uba.ar/daniel.lopez/, donde ademas pueden encontrar el  
link http://www.theophys.kth.se/~tommy/buenosaires20150428.pdf para 
descargar la charla que ya tuvo lugar  de Tommy Ohlsson.


     Saludos a todos,



Daniel E. LOPEZ-Fogliani
Theoretical Nuclear & Particle Physics (TNPP)

-- 
Daniel E. Lopez-Fogliani

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Daniel LOPEZ
Departamento de Física
Universidad de Buenos Aires and IFIBA
Ciudad Universitaria, Pabellon I
1428 Ciudad de Buenos Aires
Argentina

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