A5046218714- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Cosmology and Gravitation Theories
- Distributed and Parallel Computing Systems
- Particle accelerators and beam dynamics
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Advanced Data Storage Technologies
- Nuclear physics research studies
- Scientific Computing and Data Management
- Atomic and Subatomic Physics Research
- advanced mathematical theories
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Stochastic processes and statistical mechanics
- Gyrotron and Vacuum Electronics Research
- Radiation Detection and Scintillator Technologies
- Advanced MRI Techniques and Applications
- Nuclear Physics and Applications
University of Birmingham
2016-2025
Uppsala University
2015-2024
Institute of Nuclear Physics, Polish Academy of Sciences
2023
Vincent Wildlife Trust
2023
University of Bristol
2023
Ludwig-Maximilians-Universität München
2011-2018
University of Cambridge
2006-2018
The University of Adelaide
2013-2018
Johannes Gutenberg University Mainz
2016-2017
Imperial College London
2017
A sample of 1.69×107 fully reconstructed π0→γe+e− decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzed to search for dark photon (A′) production π0→γA′ followed prompt A′→e+e− decay. No signal observed, and an exclusion region plane mass mA′ mixing parameter ε2 established. The obtained upper limits on are more stringent than previous range 9MeV/c2<mA′<70MeV/c2. sensitivity K±→π±A′ also evaluated.
We report the results from a study of ~23 Million K+- ==> pi+- pizero decays recorded by NA48/2 experiment at CERN SPS, showing an anomaly in invariant mass distribution region around 2m+, where m+ is charged pion mass. This anomaly, never observed previous experiments, can be interpreted as effect due mainly to final state charge exchange scattering process pi+ pi- decay. It provides precise determination a0 - a2, difference between pi-pi lengths isospin I=0 and I=2 states.
We report results from the analysis of $\mbox {$\mathrm {K}^{\pm}$}\rightarrow \pi^{+} \pi^{-} \mathrm{e}^{\pm} \nu$ ( {K}_{\mathrm {e}4}$}$ ) decay by NA48/2 collaboration at CERN SPS, based on total statistics 1.13 million decays collected in 2003–2004. The hadronic form factors S- and P-wave their variation with energy are obtained. phase difference between states ππ system is accurately measured allows a precise determination {$a_{0}^{0}$}$ {$a_{0}^{2}$}$ , I = 0 2 S-wave scattering...
We report results from a new measurement of the Ke4 decay K±→π+π-e±ν by NA48/2 collaboration at CERN SPS, based on partial sample more than 670 000 decays in both charged modes collected 2003. The form factors hadronic current (F,G,H) and ππ phase difference (δ=δs-δp) have been measured ten independent bins mass spectrum to investigate their variation. A sizeable acceptance large mass, low background very good resolution contribute an improved experimental accuracy, factor two better...
We report the results from a study of full sample ∼6.031×107 K ±→π ± π 0 decays recorded by NA48/2 experiment at CERN SPS. As first observed in this experiment, invariant mass (M 00) distribution shows cusp-like anomaly region around M 00=2m +, where m + is charged pion mass. This has been interpreted as an effect due mainly to final state charge exchange scattering process −→π − decay. Fits 00 using two different theoretical formulations provide presently most precise determination 0−a 2,...
The NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple particles in 2003–2004. A new upper limit on the rate lepton number violating decay K±→π∓μ±μ± is reported: B(K±→π∓μ±μ±)<8.6×10−11 90% CL. Searches for two-body resonances X K±→πμμ (such as heavy neutral leptons N4 and inflatons χ) are also presented. In absence signals, limits set products branching fractions B(K±→μ±N4)B(N4→πμ) B(K±→π±X)B(X→μ+μ−) ranges assumed resonance masses...
The principle of energy measurement by stopping potential has been extended to high-energy electrons, using conventional accelerating tubes. Defocusing effects which occur during deceleration are minimized employing a low cylindrical electrostatic analyzer measure the remaining in beam after almost complete. width line profile obtained this technique appears be largely independent primary percent resolution thus improving as is increased. Resolution up 20 parts per million at 100 kev...
A search for the decay Ks->pi0e+e- has been made by NA48/1 experiment at CERN SPS accelerator. Using data collected during 89 days in 2002 with a high-intensity Ks beam, 7 events were found background of 0.15 events. The branching fraction BR(Ks->pi0e+e-, m(ee) > 0.165 GeV/c^2) = (3.0^{+1.5}_{-1.2}(stat) +/-0.2 (syst)) x 10^{-9} measured. vector matrix element and form factor equal to one, measurement gives BR(Ks->pi0e+e-) (5.8^{+2.9}_{-2.4}) 10^{-9}.
A search for the decay KS→π0μ+μ− has been made by NA48/1 Collaboration at CERN SPS accelerator. The data were collected during 2002 with a high-intensity KS beam. Six events found background expectation of 0.22−0.11+0.18 events. Using vector matrix element and unit form factor, measured branching ratio is B(KS→π0μ+μ−)=[2.9−1.2+1.5(stat)±0.2(syst)]×10−9.
A concise and convergent eight-step synthesis of the antifungal metabolite monocerin 1 is reported. The key step involves an allylsilane metathesis/aldehyde condensation sequence to establish core 2,3,5-trisubstituted tetrahydrofuran. End-game approaches based around intramolecular Heck chemistry revealed interesting example formal 6-endo cyclisation, origin which was probed using model substrates. ultimately completed by a strategy involving stepwise oxidative cleavage C3-ethenyl substituent.
We report on the measurement of direct emission (DE) and interference (INT) terms K ±→π ± π 0 γ decay by NA48/2 experiment at CERN SPS. From data collected during 2003 2004 about 600k such candidates have been selected. The relative amounts DE INT with respect to internal bremsstrahlung (IB) contribution measured in range $0<T^{*}_{\pi }<80$ MeV: $$\begin{array}{l}\mathrm{Frac_{\mathrm{DE}}}{(0<T^{*}_{\pi }<80~\mathrm{MeV})}\\[3pt]\quad =(3.32\pm0.15_{\mathrm{stat}}\pm...
From 56 days of data taking in 2002, the NA48/1 experiment observed 6316 Xi0 --> Sigma+ e- nubar candidates (with subsequent p pi0 decay) and 555 anti-Xi0 anti-Sigma+ e+ nu with background contamination 215+-44 136+-8 events, respectively. these samples, branching ratios BR(Xi0 nubar)= (2.51+-0.03stat+-0.09syst)E(-4) BR(anti-Xi0 nu)= (2.55+-0.14stat+-0.10syst)E(-4) were measured allowing determination CKM matrix element |Vus| = 0.209+0.023-0.028. Using Particle Data Group average for...
The NA48/2 experiment at CERN collected two data samples with minimum bias trigger conditions in 2003 and 2004. A measurement of the rate dynamic properties rare decay K±→π±γγ from these sets based on 149 candidates an estimated background 15.5±0.7 events is reported. model-independent branching ratio kinematic range z=(mγγ/mK)2>0.2 measured to be BMI(z>0.2)=(0.877±0.089)×10−6, full assuming a particular Chiral Perturbation Theory description B(Kπγγ)=(0.910±0.075)×10−6.