A5106322884- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Stochastic processes and statistical mechanics
- Distributed and Parallel Computing Systems
- International Science and Diplomacy
- Advanced Data Storage Technologies
- Particle accelerators and beam dynamics
- Advanced NMR Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Stochastic processes and financial applications
- Radioactive Decay and Measurement Techniques
- Cold Atom Physics and Bose-Einstein Condensates
University of Warwick
2016-2025
Peking University
2020-2023
State Key Laboratory of Nuclear Physics and Technology
2020-2023
Rutherford Appleton Laboratory
2023
Universidade Federal do Rio de Janeiro
2012-2021
Central China Normal University
2020
Institute of High Energy Physics
2020
University of Chinese Academy of Sciences
2020
Science Oxford
2020
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2020
We have observed a narrow state near 2.32 GeV/c2 in the inclusive D+sπ0 invariant mass distribution from e+e− annihilation data at energies 10.6 GeV. The width is consistent with experimental resolution. small intrinsic and quantum numbers of final indicate that decay violates isospin conservation. has natural spin-parity low suggests JP=0+ assignment. sample corresponds to an integrated luminosity 91 fb−1 recorded by BABAR detector SLAC PEP-II asymmetric-energy storage ring.Received 11...
We study the decay ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ using $117\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected at $Y(4S)$ resonance with BABAR detector PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ asymmetric-energy storage ring. measure branching fractions $\mathcal{B}$...
This work is on the Physics of B Factories. Part A this book contains a brief description SLAC and KEK Factories as well their detectors, BaBar Belle, data taking related issues. discusses tools methods used by experiments in order to obtain results. The results themselves can be found C. Please note that version 3 archive auxiliary book. uses notation alpha, beta, gamma for angles Unitarity Triangle. nominal phi_1, phi_2 phi_3. cite Eur. Phys. J. C74 (2014) 3026.
The Vertex Locator (VELO) is a silicon microstrip detector that surrounds the proton-proton interaction region in LHCb experiment. performance of during first years its physics operation reviewed. system operated vacuum, uses bi-phase CO2 cooling system, and sensors are moved to 7 mm from LHC beam for data taking. stability these characteristic features described, details material budget given. calibration timing processing algorithms implemented FPGAs described. fully characterised. have...
We present a measurement of the direct CP violating asymmetry in decay B0-->K+pi(-) using data sample 227x10(6) Upsilon(4S)-->BB decays collected with BABAR detector at PEP-II asymmetric-energy e(+)e(-) collider SLAC. observe total signal yield nK-(pi(+))+nK+(pi(-))=1606+/-51 and measure (nK-(pi(+))-nK+(pi(-)))/(nK-(pi(+))+nK+(pi(-)))=-0.133+/-0.030(stat)+/-0.009(syst). The probability observing such an absence violation is 1.3x10(-5), corresponding to 4.2 standard deviations.
We measure the branching fraction for flavor-changing neutral-current process B-->X(s)l(+)l(-) with a sample of 89x10(6) Upsilon(4S)-->BBmacr; events recorded BABAR detector at PEP-II e(+)e(-) storage ring. The final state is reconstructed from or micro(+)micro(-) pairs and hadronic system X(s) consisting one K+/- K(0)(S) up to two pions, most pi(0). observe signal 40+/-10(stat)+/-2(syst) extract inclusive B(B-->X(s)l(+)l(-))=(5.6+/-1.5(stat)+/-0.6(exp syst)+/-1.1(model syst))x10(-6)...
The process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ has been studied at a center-of-mass energy near the $\ensuremath{\Upsilon}(4S)$ resonance using $89.3\text{ }\text{ }{\mathrm{f}\mathrm{b}}^{\ensuremath{-}1}$ data sample collected with BABAR detector PEP-II collider. From measured $3\ensuremath{\pi}$ mass spectrum we have obtained products of branching fractions for...
We study the process $e^+e^-\to\pi^+\pi^-\pi^+\pi^-\gamma$, with a hard photon radiated from initial state. About 60,000 fully reconstructed events have been selected 89 $fb^{-1}$ of BaBar data. The invariant mass hadronic final state defines effective \epem center-of-mass energy, so that these data can be compared corresponding direct $e^+e^-$ measurements. From $4\pi$-mass spectrum, cross section for $e^+e^-\to\pi^+\pi^-\pi^+\pi^-$ is measured energies 0.6 to 4.5 $GeV/c^2$. uncertainty in...
With a sample of approximately 89 x 10(6) B(-)B pairs collected with the BABAR detector, we perform search for B meson decays into charmless vector mesons (phi, rho, and K*). We measure branching fractions, determine degree longitudinal polarization, CP violation asymmetries in processes B+-->phiK(*+), B0-->phiK(*0), B+-->rho(0)K(*+), B+-->rho(0)rho(+). also set an upper limit on fraction decay B0-->rho(0)rho(0).
A search for the nonconservation of lepton flavor number in decay τ±→μ±γ has been performed using 2.07×108 e+e−→τ+τ− events produced at a center-of-mass energy near 10.58 GeV with BABAR detector PEP-II storage ring. We find no evidence signal and set an upper limit on branching ratio B(τ±→μ±γ)<6.8×10−8 90% confidence level.Received 16 February 2005DOI:https://doi.org/10.1103/PhysRevLett.95.041802©2005 American Physical Society
A narrow state, which we label DsJ(2458)+, with a mass 2458.0±1.0(stat)±1.0(syst)MeV/c2, is observed in the inclusive D+sπ0γ distribution 91fb−1 of e+e− annihilation data recorded by BABAR detector at SLAC PEP-II asymmetric-energy storage ring. The width consistent experimental resolution. favor decay through D*s(2112)+π0 rather than D*sJ(2317)+γ. An analysis D+sπ0 accounting for influence DsJ(2458)+ produces D*sJ(2317)+ 2317.3±0.4(stat)±0.8(syst)MeV/c2. Received 24 October...
We present results on time-dependent CP asymmetries in neutral B decays to several eigenstates. The measurements use a data sample of about 227 x 10(6) upsilon(4S) --> BB collected by the BABAR detector at PEP-II asymmetric-energy Factory SLAC. amplitude CPasymmetry, sin2beta standard model, is derived from decay-time distributions events which one meson fully reconstructed final state containing charmonium and other determined be either B0 or its decay products. measure = 0.722 +/-...
We search for a charged partner of the $X(3872)$ in decay $B\ensuremath{\rightarrow}{X}^{\ensuremath{-}}K$, ${X}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$, using $234\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected at $\ensuremath{\Upsilon}(4S)$ resonance with BABAR detector PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ asymmetric-energy storage ring. The resulting product branching fraction upper...
The Dalitz plot analysis technique has become an increasingly important method in heavy flavour physics. Laura ++ fitter been developed as a flexible tool that can be used for analyses different experimental environments. Explicitly designed three-body decays of heavy-flavoured mesons to spinless final state particles, it is optimised order describe all possible resonant or nonresonant contributions, and accommodate CP violation effects. Program title: Files doi:...
The mass m(eta(c)) and total width Gamma(eta(c))(tot) of the eta(c) meson have been measured in two-photon interactions at SLAC e(+)e(-) asymmetric B Factory with BABAR detector. With a sample approximately 2500 reconstructed eta(c)-->K(0)(S)K+/-pi(-/+) decays 88 fb(-1) data, results are m(eta(c))=2982.5+/-1.1(stat)+/-0.9(syst) MeV/c(2) Gamma(eta(c))(tot)=34.3+/-2.3(stat)+/-0.9(syst) MeV/c(2). Using same decay mode, second resonance 112+/-24 events is observed 3630.8+/-3.4(stat)+/-1.0(syst)...
We present results on $B\ensuremath{\rightarrow}J/\ensuremath{\psi}K\ensuremath{\pi}$ decays using ${e}^{+}{e}^{\ensuremath{-}}$annihilation data collected with the BABAR detector at $\ensuremath{\Upsilon}(4S)$ resonance. The is located PEP-II asymmetric-energy storage ring facility Stanford Linear Accelerator Center. Using approximately $88\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs, we measure decay amplitudes for flavor eigenmodes and observe strong-phase differences...
The branching fractions of the decays B0→K*0γ and B+→K*+γ are measured using a sample 88×106BB¯ events collected with BABAR detector at PEP-II asymmetric-energy e+e− collider. We find B(B0→K*0γ)=[3.92±0.20(stat)±0.24(syst)]×10−5, B(B+→K*+γ)=[3.87±0.28(stat)±0.26(syst)]×10−5. Our measurements also constrain direct CP asymmetry to be −0.074<A(B→K*γ)<0.049 isospin −0.046<Δ0−<0.146, both 90% confidence level.Received 30 June 2004DOI:https://doi.org/10.1103/PhysRevD.70.112006©2004 American...
We report a measurement of the inclusive electron energy spectrum for semileptonic decays B mesons in data sample 52 million $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ collected with BABAR detector at PEP-II asymmetric-energy B-meson factory SLAC. determine branching fraction, first, second, and third moments lower cutoffs on between 0.6 1.5 GeV. measure partial fraction to be...
A search for the lepton-flavor-violating decay of tau into three charged leptons has been performed using 91.5 fb−1 data collected at an e+e−center-of-mass energy around 10.58 GeV with BABAR detector SLAC storage ring PEP-II. In all six modes considered, numbers events found in are compatible background expectations. Upper limits on branching fractions set range (1–3)×10−7 90% confidence level.Received 8 December 2003DOI:https://doi.org/10.1103/PhysRevLett.92.121801©2004 American Physical Society
We present evidence for the flavor-changing neutral current decay B-->K*l+l- and a measurement of branching fraction related process B-->K l+l-, where l+l- is either an epsilon+epsilon- or mu+mu- pair. These decays are highly suppressed in standard model, they sensitive to contributions from new particles intermediate state. The data sample comprises 123 x 10(6) Upsilon(4S)-->B(-)B collected with BABAR detector at SLAC PEP-II storage ring. Averaging over K(*) isospin lepton flavor, we obtain...
We report the observation of $B$ meson decay $B^\pm\to J/\psi \eta K^\pm$ and evidence for $B^0\to K^0_S$, using {90} million $BBbar$ events collected at $\ensuremath{\Upsilon{(4S)}}\xspace$ resonance with $BaBar$ detector PEP-II $e^+ e^-$ asymmetric-energy storage ring. obtain branching fractions $\cal{B}$$(B^\pm\to K^{\pm}$)=$(10.8\pm 2.3(\rm{stat.})\pm 2.4(\rm{syst.}))\times 10^{-5}$ $\cal{B}$$(B^0\to J/\psi\eta K_{\rm{S}}^{0}$)=$(8.4\pm 2.6(\rm{stat.})\pm 2.7(\rm{syst.}))\times 10^{-5}$....
We determine the inclusive B --> Xc l nu branching fraction, CKM matrix element |Vcb|, and other heavy-quark parameters from a simultaneous fit to moments of hadronic-mass lepton-energy distributions in semileptonic B-meson decays, measured as function lower limit on lepton energy, using data recorded with BABAR detector. Using Heavy Quark Expansions (HQEs) order 1/mb^3, we extract BR_cenu=(10.61 +- 0.16(exp) 0.06(HQE))% |Vcb| = (41.4 0.4(exp) 0.4(HQE) 0.6(th)) 10^-3. The stated errors refer...