S. Middleton
A5046694130- Particle physics theoretical and experimental studies
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
- High-Energy Particle Collisions Research
- Radiation Detection and Scintillator Technologies
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Radiation Therapy and Dosimetry
- Target Tracking and Data Fusion in Sensor Networks
- Scientific Computing and Data Management
- Electrostatic Discharge in Electronics
California Institute of Technology
2021-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2022-2024
Imperial College London
2013-2024
Fondazione Stella Maris
2024
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2022
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
2022
Joint Institute for Nuclear Research
2022
University of Manchester
2019
University of Cape Town
2012
Particle physics today faces the challenge of explaining mystery dark matter, origin matter over anti-matter in Universe, neutrino masses, apparent fine-tuning electro-weak scale, and many other aspects fundamental physics. Perhaps most striking frontier to emerge search for answers involves new at mass scales comparable familiar below GeV-scale, or even radically below, down sub-eV scales, with very feeble interaction strength. New theoretical ideas address questions predict such feebly...
Charged lepton flavor violation (CLFV) is expected in a diverse set of new physics scenarios. The current generation experiments probe CLFV the muon sector three complementary channels: $\mu^-N \rightarrow e^- N$ (Mu2e, COMET), $\mu^+ e^+ \gamma$ (MEG-II), and e^+e^+e^-$s (Mu3e). These aim to enhance existing limits by several orders-of-magnitude coming decade offer discovery potential many models. proposed Advanced Muon Facility (AMF) would be multi-purpose facility based at Fermilab...
Since its discovery, the muon has proven to be an invaluable probe of Standard Model (SM). Muons are readily available in tertiary beams facilities around world. They do not decay hadronically and have a lifetime few $\mu$ s; consequently, experiments offer clean, high-statistics environments make precision measurements search for new physics that could appear through deviations from SM expectation. The 2020s seen renaissance highlighted by high-profile results Fermilab Muon $g - 2$...
A dedicated measurement of additional radiation in e+e−→μ+μ−γ and e+e−→π+π−γ initial-state-radiation events is presented using the full BABAR data sample. For first time results are at next-to- next-to-next-to-leading order, with one two photons, respectively, for from initial final states. Comparison predictions phokhara afkqed Monte Carlo generators performed, revealing discrepancies one-photon rates angular distributions former. This disagreement has a negligible effect on e+e−→π+π−(γ)...
The constituents of dark matter are still unknown, and the viable possibilities span a vast range masses. physics community has established searching for sub-GeV as high priority identified accelerator-based experiments an essential facet this search strategy. A key goal program is testing broad idea thermally produced through designed to directly produce particles. most sensitive way production light use primary electron beam it in fixed-target collisions. Light Dark Matter eXperiment...
Axionlike particles (ALPs) are predicted in many extensions of the standard model, and their masses can naturally be well below electroweak scale. In presence couplings to bosons, these could emitted flavor-changing B meson decays. We report herein a search for an ALP, a, reaction B^{±}→K^{±}a, a→γγ using data collected by BABAR experiment at SLAC. No significant signal is observed, 90% confidence level upper limits on ALP coupling bosons derived as function mass, improving current...
A novel single-particle technique to measure emittance has been developed and used characterise seventeen different muon beams for the Muon Ionisation Cooling Experiment (MICE). The beams, whose mean momenta vary from 171 281 MeV/c, have emittances of approximately 1.5--2.3 \pi mm-rad horizontally 0.6--1.0 vertically, a horizontal dispersion 90--190 mm momentum spreads about 25 MeV/c. There is reasonable agreement between measured parameters results simulations. are found meet requirements MICE.
The process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ is studied at a center-of-mass energy near the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance using data sample of $469\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with BABAR detector PEP-II collider. We have performed precise measurement...
This article presents a model-independent search for an additional, mostly sterile, heavy neutral lepton (HNL), that is capable of mixing with the Standard Model $\ensuremath{\tau}$ neutrino strength $|{U}_{\ensuremath{\tau}4}{|}^{2}$, corresponding to absolute square extended Pontecorvo-Maki-Nakagawa-Sakata matrix element. Data from BABAR experiment, total integrated luminosity $424\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, are analyzed using kinematic approach makes no assumptions...
We study the processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$, ${K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$, and...
A new mechanism has been proposed to simultaneously explain the presence of dark matter and matter-antimatter asymmetry in universe. This scenario predicts exotic $B$ meson decays into a baryon sector anti-baryon ($\psi_D$) with branching fractions accessible at factories. We present search for $B \rightarrow \Lambda \psi_D$ using data collected by $BABAR$ experiment SLAC. reaction is identified fully reconstructing accompanying requiring single $\Lambda$ remaining particles. No significant...
The Muon Ionization Cooling Experiment (MICE) will perform a detailed study of ionization cooling to evaluate the feasibility technique. To carry out this program, MICE requires an efficient particle-identification (PID) system identify muons. Electron-Muon Ranger (EMR) is fully-active tracking-calorimeter that forms part PID and tags muons traverse channel without decaying. detector capable identifying electrons with efficiency 98.6%, providing purity for beam exceeds 99.8%. EMR also proved...
The international Muon Ionization Cooling Experiment (MICE) will perform a systematic investigation of ionization cooling with muon beams momentum between 140 and 240\,MeV/c at the Rutherford Appleton Laboratory ISIS facility. measurement in MICE relies on selection pure sample muons that traverse experiment. To make this selection, Beam is designed to deliver beam less than $\sim$1\% contamination. final employs particle-identification (PID) system upstream downstream cell. PID includes...
Abstract Accelerated muon beams have been considered for the next-generation studies of high-energy lepton–antilepton collisions and neutrino oscillations. However, high-brightness not yet produced. The main challenge acceleration storage stems from large phase-space volume occupied by beam, derived production mechanism muons through decay pions. beam can be decreased ionization cooling. Here we show that cooling leads to a reduction in transverse emittance traverse lithium hydride or liquid...
This paper investigates target tracking using Doppler only, observed from multiple receivers in a multi-static configuration. The filter selected for this study is the recursive Gauss-Newton based on Levenberg Marquardt method. FM Band Commensal Radar (radar that uses another system's EM emissions) produces Range versus plot, where resolution very precise due to long integration time, but range at best poor narrow broadcast channel bandwidth. Thus, relies mostly seems most sensible type of...
An observation of Charged Lepton Flavor Violation (CLFV) would be unambiguous evidence for physics beyond the Standard Model. The Mu2e and COMET experiments, under construction, are designed to push sensitivity CLFV in mu e conversion process unprecedented levels. Whether is observed or not, there a strong case made further improving sensitivity, examining on additional target materials. Mu2e-II proposed upgrade Mu2e, with at least an order magnitude rate over Mu2e. approach challenges this...
A bstract The Light Dark Matter eXperiment (LDMX) is an electron-beam fixed-target experiment designed to achieve comprehensive model independent sensitivity dark matter particles in the sub-GeV mass region. An upgrade LCLS-II accelerator will increase beam energy available LDMX from 4 8 GeV. Using detailed GEANT4-based simulations, we investigate effect of increased on capabilities separate signal and background, demonstrate that veto methodology developed for GeV successfully rejects...
A new dark sector antibaryon, denoted ψD, could be produced in decays of B mesons. This Letter presents a search for B+→ψD+p (and the charge conjugate) e+e− annihilations at 10.58 GeV, using data collected BABAR experiment. Data corresponding to an integrated luminosity 398 fb−1 are analyzed. No evidence signal is observed. Branching fraction upper limits range from 10−7–10−5 obtained 90% confidence level masses 1.0<mψD<4.3 GeV/c2. The result also reinterpreted provide first on...
High-brightness muon beams of energy comparable to those produced by state-of-the-art electron, proton and ion accelerators have yet be realised. Such the potential carry search for new phenomena in lepton-antilepton collisions extremely high also provide uniquely well-characterised neutrino beams. A beam may created through decay pions interaction a with target. To produce high-brightness from such source requires that phase space volume occupied muons reduced (cooled). Ionization cooling...
The Muon Ionization Cooling Experiment (MICE) collaboration seeks to demonstrate the feasibility of ionization cooling, technique by which it is proposed cool muon beam at a future neutrino factory or collider. emittance measured from an ensemble muons assembled those that pass through experiment. A pure selected using particle-identification system can reject efficiently both pions and electrons. position momentum each are high-precision scintillating-fibre tracker in 4 T solenoidal...
The Muon Ionization Cooling Experiment (MICE) collaboration has developed the MICE Analysis User Software (MAUS) to simulate and analyze experimental data. It serves as primary codebase for experiment, providing offline batch simulation reconstruction well online data quality checks. software provides both traditional particle-physics functionalities such track particle identification, accelerator physics functions, calculating transfer matrices emittances. code design is object orientated,...
The Mu2e experiment at Fermilab will search for the standard model-forbidden, charged lepton flavour-violating conversion of a negative muon into an electron in field aluminium nucleus. distinctive signal signature is represented by mono-energetic with energy near muon’s rest mass. aims to improve current single-event sensitivity four orders magnitude means high-intensity pulsed beam and high-precision tracking system. electromagnetic calorimeter complements tracker providing high rejection...