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An automatic target monitoring method based on photographs taken by a CMOS photo-camera has been developed for the MEG II detector. The technique could be adapted for other fixed-target experiments requiring good knowledge of their target…

仪器与探测器 · 物理学 2021-04-14 G. Cavoto , G. Chiarello , M. Hildebrandt , A. Hofer , K. Ieki , M. Meucci , S. Milana , V. Pettinacci , F. Renga , C. Voena

We consider the possibility to gain information on the lepton mixing matrix element |U_{e3}| from an improved experimental limit on the effective neutrino mass governing neutrino-less double beta decay. We show that typically a lower limit…

高能物理 - 唯象学 · 物理学 2009-12-17 Alexander Merle , Werner Rodejohann

Axion-like particles (ALPs) with lepton-flavor violating couplings can be probed in exotic muon and tau decays. The sensitivity of different experiments depends strongly on the ALP mass and its couplings to leptons and photons. For ALPs…

高能物理 - 唯象学 · 物理学 2020-06-24 Martin Bauer , Matthias Neubert , Sophie Renner , Marvin Schnubel , Andrea Thamm

MECO will search for direct evidence of muon and electron flavor violation in the decay of muons in Coulomb bound states via coherent recoil of the nucleus and decay electron. The expected sensitivity to the $\mu^{-} {\rm N} \to e^{-} +…

高能物理 - 实验 · 物理学 2009-11-07 James L. Popp

Monolithic Active Pixel Sensors (MAPS) achieved widespread use in several scientific applications, thanks to their properties, such as low material budget and high granularity. The ARCADIA INFN project developed a Fully-Depleted MAPS…

This article presents the sensitivity of the ATLAS experiment to the lepton-flavour-violating decays of $\tau\to 3\mu$. A method utilising the production of $\tau$ leptons via $W\to\tau\nu$ decays is used. This method is applied to the…

高能物理 - 实验 · 物理学 2016-05-03 ATLAS Collaboration

The DEPFET collaboration develops highly granular, ultra-transparent active pixel detectors for high-performance vertex reconstruction at future collider experiments. The characterization of detector prototypes has proven that the key…

The MEG detector is designed to test Lepton Flavor Violation in the $\mu^+\rightarrow e^+\gamma$ decay down to a Branching Ratio of a few $10^{-13}$. The decay topology consists in the coincident emission of a monochromatic photon in…

仪器与探测器 · 物理学 2011-06-13 P. W. Cattaneo , M. De Gerone , S. Dussoni , F. Gatti , M. Rossella , Y. Uchiyama , R. Valle

The MUonE experiment proposes a novel approach to determine the leading hadronic contribution to the muon g-2, from a precise measurement of the differential cross section of the $\mu-e$ elastic scattering, achievable by using the CERN SPS…

高能物理 - 实验 · 物理学 2024-01-09 E. Spedicato

The final results of the search for the lepton flavour violating decay $\mu^{+} \rightarrow {\rm e^{+}} \gamma$ based on the full dataset collected by the MEG experiment at the Paul Scherrer Institut in the period 2009--2013 and totalling…

高能物理 - 实验 · 物理学 2016-08-01 The MEG Collaboration

CMOS Pixel Sensors tend to become relevant for a growing spectrum of charged particle detection instruments. This comes mainly from their high granularity and low material budget. However, several potential applications require a higher…

Within the Standard Model, in spite of neutrino oscillations, the flavor of charged leptons is conserved in very good approximation, and therefore charged Lepton Flavor Violation is expected to be unobservable. On the other hand, most new…

高能物理 - 实验 · 物理学 2014-10-20 Francesco Renga

Depleted Monolithic Active Pixel Sensors (DMAPS) constitute a promising low cost alternative for the outer layers of the ATLAS experiment Inner Tracker (ITk). Realizations in modern, high resistivity CMOS technologies enhance their…

Charged lepton flavour violating processes are unobservable in the standard model, but they are predicted to be enhanced in several new physics extensions. We present the results of a search for $\Upsilon (2S)$ and $\Upsilon (3S)$ decays to…

高能物理 - 实验 · 物理学 2026-03-09 H. Ahmed , N. Tasneem , J. M. Roney

The MEG experiment took data at the Paul Scherrer Institute in the years 2009--2013 to test the violation of the lepton flavour conservation law, which originates from an accidental symmetry that the Standard Model of elementary particle…

In the framework of the minimal ${SU}(3)_C\otimes {SU}(3)_L \otimes {U}(1)_N$ model, the lepton-flavour-violating decay $\pi^+ \ra \mu^- \nu_\mu e^+ e^+ $ is calculated without directly invoking lepton mixing. The branching ratio for this…

高能物理 - 唯象学 · 物理学 2008-11-26 Hoang Ngoc Long

DEPleted Field Effect Transistor (DEPFET) active pixel detectors combine a first amplification stage with a fully depleted sensor in one single device, resulting in a very good signal-to-noise ratio even for thin sensors. DEPFET pixels are…

仪器与探测器 · 物理学 2010-10-19 P. Vazquez

Strip and pixels sensors, fabricated on high resistivity silicon substrate, normally of p-type, are used in detectors for High Energy Physics (HEP) typically in a hybrid detector assembly. Furthermore, and owing to their inherent advantages…

The Mu2e Experiment at Fermilab will search for coherent, neutrinoless conversion of muons into electrons in the field of a nucleus, with a sensitivity improvement of a factor of 10^4 over previous experiments. Such a charged lepton…

仪器与探测器 · 物理学 2019-08-12 Raffaella Donghia

A search for second and third generation scalar and vector leptoquarks produced in ep collisions via the lepton flavour violating processes ep -> mu X and ep -> tau X is performed by the H1 experiment at HERA. The full data sample taken at…

高能物理 - 实验 · 物理学 2015-05-27 H1 Collaboration