Abstract
In dark matter studies, the absence of experimental evidences other than the astrophysical observations, has triggered new approaches. Nowadays, many particle physics experiments at ...accelerators are trying to contribute by looking for signals of hidden particles postulated by different theoretical extensions of the Standard Model. This results in a vaste hunting for new particles with a wide range of properties with the intention to also give reason to other unexplained particle physics phenomena. Within this scenario is inserted the Positron Annihilation into Dark Matter Experiment (PADME) ongoing at the Laboratori Nazionali di Frascati of INFN that is looking for signals of hidden particles by studying the annihilations of a positron beam with the electrons of a fixed target. PADME had, up to now, two data taking periods devoted to the search of a dark photon signal, but its setup turned out to be also suited to explore the existence of a protophobic new boson of mass 17 MeV/
c
2
postulated to explain an anomalous effect observed by a Hungarian group while studying nuclear excited states. In this paper it is reported an overview of the PADME experiment and of the modifications implemented to allow a dedicated data taking at 282 MeV beam energy, meant to produce the new particle at resonance.
The Positron Annihilation to Dark Matter Experiment (PADME) uses the positron beam of the DA
\Phi
Φ
NE Beam-Test Facility, at the Laboratori Nazionali di Frascati (LNF) to search for a Dark Photon ...A’. The search technique studies the missing mass spectrum of single-photon final states in
e^+e^-\rightarrow A'\gamma
e
+
e
−
→
A
′
γ
annihilation in a positron-on-thin-target experiment. This approach facilitates searches for new particles such as long lived Axion-Like-Parti-cles, protophobic X bosons and Dark Higgs. This talk illustrated the scientific program of the experiment and its first physics results. In particular, the measurement of the cross-section of the SM process
e^+e^-\rightarrow \gamma\gamma
e
+
e
−
→
γ
γ
at
\sqrt{s}
s
=21 MeV was shown.
PADME (Positron Annihilation into Dark Matter Experiment) is searching for the production of a dark photon from positron-electron annihilation e^+e^−→γA′ using the positron beam of the Beam Test ...Facility (BTF) of the DAΦNE Linac at Laboratori Nazionali di Frascati (LNF). This work presents the assembly and the performance of the charged particle veto system required to identify Bremsstrahlung processes which are the main source of background events.
Status of the PADME experiment Spagnolo, Stefania
Journal of physics. Conference series,
12/2018, Letnik:
1137, Številka:
1
Journal Article
Recenzirano
Odprti dostop
Among the theoretical models addressing the dark matter problem, the category based on a secluded sector is attracting increasing interest. The PADME experiment, at the Laboratori Nazionali di ...Frascati of INFN, is designed to be sensitive to the production of a low mass gauge boson A′ of a new U(1) symmetry holding for dark sector particles and weakly coupled to the Standard Model photon. The DAΦNE Beam-Test Facility at LNF will provide a high intensity, mono-energetic positron beam impinging on a low Z target. The PADME detector will measure with high precision the momentum of the photon, produced along with the A′ boson in e+e− → A′+γ annihilation in the target, thus allowing to measure the A′ mass as the missing mass in the final state. This technique, particularly useful in case of invisible decays of the A′ boson, will be exploited for the first time in a fixed target experiment. Simulation studies predict a sensitivity on the interaction strength (ϵ2 parameter) down to 10−6, in the mass region 1 MeV < MA′ < 23.7 MeV. In this work the physics potential, the experimental strategy and the status of readiness of the experiment will be reviewed.
The inclusive cross-section of annihilation in flight
$e^+e^-\rightarrow\gamma\gamma$ of 430 MeV positrons with atomic electrons of a
thin diamond target has been measured with the PADME detector at ...the Laboratori
Nazionali di Frascati. The two photons produced in the process were detected by
an electromagnetic calorimeter made of BGO crystals. This measurement is the
first one based on the direct detection of the photon pair and one of the most
precise for positron energies below 1 GeV. This measurement represents a
necessary step to search for dark sector particles and mediators weakly coupled
to photons and/or electrons with masses ranging from 1 MeV to 20 MeV with
PADME. The measurement agrees with the Next to Leading Order QED prediction
within the overall 6% uncertainty.
Particle physics today faces the challenge of explaining the mystery of dark matter, the origin of matter over anti-matter in the Universe, the origin of the neutrino masses, the apparent fine-tuning ...of the electro-weak scale, and many other aspects of fundamental physics. Perhaps the most striking frontier to emerge in the search for answers involves new physics at mass scales comparable to familiar matter, below the GeV-scale, or even radically below, down to sub-eV scales, and with very feeble interaction strength. New theoretical ideas to address dark matter and other fundamental questions predict such feebly interacting particles (FIPs) at these scales, and indeed, existing data provide numerous hints for such possibility. A vibrant experimental program to discover such physics is under way, guided by a systematic theoretical approach firmly grounded on the underlying principles of the Standard Model. This document represents the report of the FIPs 2022 workshop, held at CERN between the 17 and 21 October 2022 and aims to give an overview of these efforts, their motivations, and the decadal goals that animate the community involved in the search for FIPs.
The PADME experiment at the DA\(\Phi\)NE Beam-Test Facility (BTF) of the INFN Laboratory of Frascati is designed to search for invisible decays of dark sector particles produced in electron-positron ...annihilation events with a positron beam and a thin fixed target, by measuring the missing mass of single-photon final states. The presence of backgrounds originating from beam halo particles can significantly reduce the sensitivity of the experiment. To thoroughly understand the origin of the beam background contribution, a detailed Geant4-based Monte Carlo simulation has been developed, containing a full description of the detector together with the beam line and its optical elements. This simulation allows the full interactions of each particle to be described, both during beam line transport and during detection, a possibility which represents an innovative way to obtain reliable background predictions
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