A5027117340- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Cosmology and Gravitation Theories
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Nuclear physics research studies
- Stochastic processes and statistical mechanics
- Nuclear reactor physics and engineering
- Astrophysics and Cosmic Phenomena
- Advanced NMR Techniques and Applications
- Radiation Therapy and Dosimetry
- International Science and Diplomacy
- Distributed and Parallel Computing Systems
- Radioactive Decay and Measurement Techniques
- Markov Chains and Monte Carlo Methods
- Advanced Optical Sensing Technologies
University of Warwick
2016-2025
Tsinghua University
2023
Rutherford Appleton Laboratory
2023
Karlsruhe Institute of Technology
2011-2021
École Polytechnique Fédérale de Lausanne
2011-2021
Photek (United Kingdom)
2021
European Organization for Nuclear Research
2021
University of Oxford
2021
University of Edinburgh
2021
University of Bristol
2021
The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,062 new measurements 721 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. All search limits are listed in Summary Tables. also give numerous tables, figures, formulae, reviews...
Abstract The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 2,143 new measurements 709 papers, we list, evaluate, average measured properties gauge bosons the recently discovered Higgs boson, leptons, quarks, mesons, baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle search limits are listed in Summary Tables. give numerous tables, figures, formulae,...
Measurements of charged pion and kaon production in central Pb+Pb collisions at 40, 80, 158 A GeV are presented. These compared with data lower higher energies as well results from $p+p$ interactions. The mean multiplicity per wounded nucleon increases approximately linearly ${s}_{\mathrm{NN}}^{1/4}$ a change slope starting the region 15--40 GeV. suppression respect to interactions, observed low collision energies, enhancement high occurs about 40A nonmonotonic energy dependence ratio...
Results on charged pion and kaon production in central Pb+Pb collisions at 20A 30A GeV are presented compared to data lower higher energies. A rapid change of the energy dependence is observed around for yields pions kaons as well shape transverse mass spectra. The compatible with prediction that threshold a state deconfined matter early stage located low SPS
Directed and elliptic flow measurements for charged pions protons are reported as a function of transverse momentum, rapidity, centrality 40A 158AGeV Pb+Pb collisions, recorded by the NA49 detector. Both standard method correlating particles with an event plane cumulant studying multiparticle correlations used. In directed is corrected conservation momentum. reconstructed from genuine four-, six-, eight-particle correlations, showing first unequivocal evidence collective motion in A+A...
Results of resonance searches in the Xi(-)pi(-), Xi(-)pi(+), Xi;(+)pi(-), and Xi;(+)pi(+) invariant mass spectra proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for existence a narrow Xi(-)pi(-) baryon with 1.862+/-0.002 GeV/c(2) width below detector resolution about 0.018 GeV/c(2). The significance estimated to be above 4.2sigma. This state candidate hypothetical exotic Xi(--)(3/2) S=-2, I=3 / 2, quark content (dsdsū). At same mass, peak observed Xi(-)pi(+)...
The process $\gamma \gamma \to \phi \jpsi$ is measured for $\phi masses between threshold and 5 GeV/${\it c}^2$, using a data sample of 825 fb$^{-1}$ collected with the Belle detector. A narrow peak $8.8^{+4.2}_{-3.2}$ events, significance 3.2 standard deviations including systematic uncertainty, observed. mass natural width structure (named X(4350)) are to be $(4350.6^{+4.6}_{-5.1}(\rm{stat})\pm 0.7(\rm{syst})) \hbox{MeV}/{\it c}^2$ $(13^{+18}_{-9}(\rm{stat})\pm 4(\rm{syst})) \hbox{MeV}$,...
The transverse mass ${m}_{t}$ distributions for antiprotons are measured at midrapidity minimum bias Pb+Pb collisions 158A GeV and central 20A, 30A, 40A, 80A beam energies in the fixed target experiment NA49 CERN SPS. rapidity density $\mathit{dn}/\mathit{dy}$, inverse slope parameter T, mean $\ensuremath{\langle}{m}_{t}\ensuremath{\rangle}$ derived from studied as a function of incident energy collision centrality compared to relevant data on proton production. shapes $\overline{p}$ p very...
The transverse mass ${m}_{t}$ distributions for deuterons and protons are measured in $\text{Pb}+\text{Pb}$ reactions near midrapidity the range $0<{m}_{t}\ensuremath{-}m<1.0\phantom{\rule{0.3em}{0ex}}(1.5)\phantom{\rule{0.3em}{0ex}}\text{GeV}∕{c}^{2}$ minimum bias collisions at $158A\phantom{\rule{0.3em}{0ex}}\text{GeV}$ central 40 $80\phantom{\rule{0.3em}{0ex}}A\phantom{\rule{0.3em}{0ex}}\text{GeV}$ beam energies. rapidity density $dn∕dy$, inverse slope parameter $T$ mean $⟨{m}_{t}⟩$...
The cross sections for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\phi}{f}_{0}(980)$ are measured from threshold to $\sqrt{s}=3.0\text{ }\text{ }\mathrm{GeV}$ using initial-state radiation. analysis is based on a data sample of $673\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected below the $\ensuremath{\Upsilon}(4S)$ resonance with Belle...
Using 605 fb−1 of data collected at the Υ(4S) resonance we present a measurement inclusive radiative B-meson decay channel, B→Xsγ. For lower photon energy thresholds 1.7, 1.8, 1.9, and 2.0 GeV, as defined in rest frame B meson, measure partial branching fraction mean variance spectrum. At 1.7 GeV threshold obtain BF(B→Xsγ)=(3.45±0.15±0.40)×10−4, where errors are statistical systematic.Received 8 July 2009DOI:https://doi.org/10.1103/PhysRevLett.103.241801©2009 American Physical Society
Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, 158 A$\cdot$GeV beam energy on a fixed target. Transverse mass spectra rapidity distributions are given for all three energies. The $\Lambda/\pi$ ratio mid-rapidity full phase space shows pronounced maximum between the highest AGS 40 SPS energies, whereas $\bar{\Lambda}/\pi$ exhibits monotonic increase.
Results are presented on event-by-event fluctuations in transverse momentum of charged particles, produced at forward rapidities p+p, C+C, Si+Si and Pb+Pb collisions 158 AGeV. Three different characteristics discussed: the average event, Phi_pT fluctuation measure two-particle correlations. In kinematic region explored, dynamical found to be small. However, a significant system size dependence is observed, with largest value measured peripheral interactions. The data compared predictions...
We present a measurement of the decay B−→τ−ν¯τ using data sample containing 657×106 BB¯ pairs collected at Υ(4S) resonance with Belle detector KEKB asymmetric-energy e+e− collider. A B+B− are tagged by reconstructing one B+ meson decaying semileptonically. detect candidate in recoil. obtain signal significance 3.6 standard deviations including systematic uncertainties, and measure branching fraction to be B(B−→τ−ν¯τ)=[1.54−0.37+0.38(stat)−0.31+0.29(syst)]×10−4. This result confirms evidence...
We present measurements of the energy dependence event-by-event fluctuations in K/pi and (p + \bar{p})/pi multiplicity ratios heavy ion collisions at CERN SPS. The particle ratio were obtained for central Pb+Pb five collision energies, \sqrt{s_{_{NN}}}, between 6.3 17.3 GeV. After accounting effects finite-number statistics detector resolution, we extract strength non-statistical each energy. For ratio, larger than expected independent production are found all energies. smaller expectations...
New data on the production of protons, anti-protons and neutrons in p+p interactions are presented. The come from a sample 4.8 million inelastic events obtained with NA49 detector at CERN SPS 158 GeV/c beam momentum. charged baryons identified by energy loss measurement large TPC tracking system. Neutrons detected forward hadronic calorimeter. Inclusive invariant cross sections intervals 0 to 1.9 (0 1.5 GeV/c) transverse momentum -0.05 0.95 (-0.05 0.4) Feynman x for protons (anti-protons),...
Multiplicity fluctuations of positively, negatively and all charged hadrons in the forward hemisphere were studied central Pb+Pb collisions at 20A, 30A, 40A, 80A 158A GeV. The multiplicity distributions their scaled variances are presented dependence collision energy as well rapidity transverse momentum. have bell-like shape range from 0.8 to 1.2 without any significant structure dependence. No indication critical point observed. string-hadronic model UrQMD significantly overpredicts mean,...
Rare $b \to s\ell^+\ell^-$ flavour-changing-neutral-current processes provide important tests of the Standard Model particle physics. Angular observables in exclusive can be particularly powerful as they allow hadronic uncertainties to controlled. Amongst that have been studied by experiments, decay $\Lambda_b\to \Lambda\ell^+\ell^-$ is unique $\Lambda_b$ baryon produced polarised. In this paper, we derive an expression for angular distribution case where This extends number from 10 34....
Emission of pi+/-, K+/-, phi, and Lambda was measured in near-central C+C Si+Si collisions at 158 AGeV beam energy. Together with earlier data for p+p, S+S, Pb+Pb, the system-size dependence relative strangeness production nucleus-nucleus is obtained. Its fast rise saturation observed about 60 participating nucleons can be understood as onset formation coherent systems increasing size.
Results are presented on event-by-event fluctuations of transverse momenta pT in central Pb+Pb interactions at 20A, 30A, 40A, 80A, and 158A GeV. The analysis was performed for charged particles forward center-of-mass rapidity (1.1<yπ*<2.6). Three fluctuation measures were studied: the distribution average momentum M(pT) event, ΦpT measure, two-particle correlations. Fluctuations small show no significant energy dependence range CERN Super Proton Synchrotron. compared with QCD-inspired...
The centrality and system size dependence of multiplicity fluctuations charged particles produced in nuclear collisions at $158 A$ GeV was studied by the NA49 collaboration. Centrality selected Pb+Pb collisions, semi-central C+C Si+Si as well inelastic p+p interactions were analyzed. number projectile participants determined on an event-by-event basis used to characterize collision centrality. scaled variance distribution obtained forward rapidity region ($1.1 <y_{c.m.} <2.6$) shows a...
Pion production in nuclear collisions at the SPS is investigated with aim to search, a restricted domain of phase diagram, for power-laws behavior correlations which are compatible critical QCD. We have analyzed interactions nuclei different size (p+p, C+C, Si+Si, Pb+Pb) 158$A$ GeV adopting, as appropriate observables, scaled factorial moments search intermittent fluctuations transverse dimensions. The analysis performed $\pi^+\pi^-$ pairs invariant mass very close two-pion threshold. In...
New data on the production of charged kaons in p+p interactions are presented. The come from a sample 4.8 million inelastic events obtained with NA49 detector at CERN SPS 158 GeV/c beam momentum. identified by energy loss large TPC tracking system. Inclusive invariant cross sections intervals 0 to 1.7 transverse momentum and 0.5 Feynman x. Using these as reference, new evaluation dependence kaon production, including neutral kaons, is conducted over range 3 GeV...