Seminario di Fenomenologia Dr.ssa Carmelita Carbone (INAF Milano)
Seminario teorico: Alexander Krikun (Nordita Sweden)
Seminario fenomenologia: Matt LeBlanc (U. of Arizona/CERN)
Seminario di Fenomenologia Dr.Pablo Quilez (DESY)
Seminario teorico: Angelo Bassi (Uni Trieste)
Seminario di Astrofisica Anna Ciurlo (UCLA)
ANNULLATO Seminario teorico: Matteo Lostaglio (Barcellona)
Machine Learning for BSM searches: A New Perspective
Machine Learning (ML) techniques are emerging as a competitive tool for
The partonic structure of the electron
Although the computation of a vast class of $e^+e^-$ cross sections
is fully doable in perturbative QED, the perturbative series is not
well behaved unless a mechanism is devised that allows one to take
into account, to all orders in the coupling constant, the effects
due to multiple emissions of photons and $e^+e^-$ pairs off the
incoming particles. I shall discuss one such mechanism, that has
a strict analogy with its counterpart in QCD and is based upon
the so-called Parton Distribution Functions (PDFs) of the electron
and the positron. I shall present recent results that have improved
the accuracy to which these PDFs are known.
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POKER: POsitron resonant annihilation into darK mattER
Light dark matter is the new compelling hypothesis that identifies dark matter with new sub-GeV “Hidden Sector” states, neutral under Standard Model interactions and interfacing with our world through a new force. Accelerator-based searches at the intensity frontier are uniquely suited to explore it. However, current and planned efforts are either limited by the low sensitivity or the high backgrounds. This calls for a major breakthrough in the field.
The goal of POKER is to establish and demonstrate a new approach to search for light dark matter, based on a missing energy measurement with a positron-beam, active thick-target setup.
The new technique, based on light dark matter production through positron annihilation on atomic electrons, is characterized by a larger signal yield compared to previously explored reactions, and by a unique signal signature resulting from the underlying reaction dynamics: a peak in the missing energy distribution.
The final objective of the project, approved as a 1.5 M€ ERC Starting Grant for 2020-2025, is to perform a pilot run with the 100 GeV positron beam available at the H4 beamline at CERN, to demonstrate the technique by exploring a so-far unknown territory in the Hidden Sector parameters space.
In this seminar, after a brief introduction the Hidden Sector physics case, I’ll first discuss the potential of accelerator-based light dark matter efforts. I’ll then present the POKER experiment, focusing on the active thick target – the key element of the project. I’ll finally show the sensitivity of POKER to different Light Dark Matter scenarios.