A5081972725- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- CCD and CMOS Imaging Sensors
- Computational Physics and Python Applications
- Radiation Effects in Electronics
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Silicon and Solar Cell Technologies
- Advancements in Semiconductor Devices and Circuit Design
- Nuclear physics research studies
- Nuclear Physics and Applications
- Stochastic processes and statistical mechanics
- Semiconductor materials and devices
- Cosmology and Gravitation Theories
- Electrostatic Discharge in Electronics
- Radiation Therapy and Dosimetry
- International Science and Diplomacy
University of Liverpool
2016-2025
Imperial College London
2014-2023
Fondazione Bruno Kessler
2020-2022
Petersburg Nuclear Physics Institute
2012-2021
University of Chinese Academy of Sciences
2020
Tsinghua University
2020
Peking University
2020
State Key Laboratory of Nuclear Physics and Technology
2020
Central China Normal University
2020
Institute of High Energy Physics
2020
The branching fraction ratio R(D^{*})≡B(B[over ¯]^{0}→D^{*+}τ^{-}ν[over ¯]_{τ})/B(B[over ¯]^{0}→D^{*+}μ^{-}ν[over ¯]_{μ}) is measured using a sample of proton-proton collision data corresponding to 3.0 fb^{-1} integrated luminosity recorded by the LHCb experiment during 2011 and 2012. tau lepton identified in decay mode τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ}. semitauonic sensitive contributions from non-standard-model particles that preferentially couple third generation fermions, particular,...
The LHCb detector is a forward spectrometer at the Large Hadron Collider (LHC) CERN. experiment designed for precision measurements of CP violation and rare decays beauty charm hadrons. In this paper performance various sub-detectors trigger system are described, using data taken from 2010 to 2012. It shown that design criteria have been met. excellent has allowed collaboration publish wide range physics results, demonstrating LHCb's unique role, both as heavy flavour general purpose in region.
We present a measurement of form-factor-independent angular observables in the decay ${B}^{0}\ensuremath{\rightarrow}{K}^{*}(892{)}^{0}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$. The analysis is based on data sample corresponding to an integrated luminosity $1.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected by LHCb experiment $pp$ collisions at center-of-mass energy 7 TeV. Four are measured six bins dimuon invariant mass squared ${q}^{2}$ range...
A search for the rare decays ${B}_{s}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ is performed with data collected in 2011 2012 LHCb experiment at Large Hadron Collider. The samples comprise $1.1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of proton-proton collisions $\sqrt{s}=8\text{ }\mathrm{TeV}$ $1.0\text{ $\sqrt{s}=7\text{ }\mathrm{TeV}$. We...
The quantum numbers of the X(3872) meson are determined to be JPC = 1++ based on angular correlations in B+ K+ decays, where pi+pi- J/psi and \mu+\mu-. data correspond 1.0 fb-1 pp collisions collected by LHCb detector. only alternative assignment allowed previous measurements, JPC=2-+, is rejected with a confidence level equivalent more than eight Gaussian standard deviations using likelihood-ratio test full phase space. This result favors exotic explanations state.
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...
The production of J/psi mesons in proton-proton collisions at sqrt(s)=7 TeV is studied with the LHCb detector LHC. differential cross-section for prompt measured as a function transverse momentum pT and rapidity y fiducial region 0<pT<14 GeV/c 2.0<y<4.5. fraction from b-hadron decays are also same ranges. analysis based on data sample corresponding to an integrated luminosity 5.2pb-1. cross-sections over 10.52 +/- 0.04 1.40 +1.64/-2.20 mub 1.14 0.01 0.16 decays, where first uncertainty...
A search for the rare decays ${B}_{s}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ is performed at LHCb experiment. The data analyzed correspond to an integrated luminosity of $1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $pp$ collisions a center-of-mass energy 7 TeV $2\text{ 8 TeV. An excess signal candidates with respect background expectation seen...
A bstract search for $$ {B}_s^0\to {\overline{D}}^0{f}_0(980) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>B</mml:mi><mml:mi>s</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo>→</mml:mo><mml:msup><mml:mover><mml:mi>D</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup><mml:msub><mml:mi>f</mml:mi><mml:mn>0</mml:mn></mml:msub><mml:mfenced><mml:mn>980</mml:mn></mml:mfenced></mml:math> decays is performed using 3 . 0 fb 1− of pp collision data...
During the shutdown of CERN Large Hadron Collider in 2013-2014, an additional pixel layer was installed between existing Pixel detector ATLAS experiment and a new, smaller radius beam pipe. The motivation for this new layer, Insertable B-Layer (IBL), to maintain or improve robustness performance tracking system, given higher instantaneous integrated luminosities realised following shutdown. Because extreme radiation collision rate environment, several radiation-tolerant sensor electronic...
Charm production at the LHC in pp collisions s=7TeV is studied with LHCb detector. The decays D0→K−π+, D+→K−π+π+, D⁎+→D0(K−π+)π+, Ds+→ϕ(K−K+)π+, Λc+→pK−π+, and their charge conjugates are analysed a data set corresponding to an integrated luminosity of 15 nb−1. Differential cross-sections dσ/dpT measured for prompt five charmed hadron species bins transverse momentum rapidity region 0<pT<8GeV/c 2.0<y<4.5. Theoretical predictions compared differential cross-sections. charm hadrons computed...
An angular analysis and a measurement of the differential branching fraction decay B 0 → ϕμ + μ − are presented, using data corresponding to an integrated luminosity 3.0 fb−1 pp collisions recorded by LHCb experiment at $$ \sqrt{s}=7 8 TeV. Measurements reported as function q 2, square dimuon invariant mass results found be consistent with Standard Model. In range 1 < 2 6 GeV2 /c 4, where precise theoretical calculations available, is more than 3σ below Model predictions.
A search for Bs -> mu+ mu- and B0 decays is performed using 1.0 fb^-1 of pp collision data collected at \sqrt{s}=7 TeV with the LHCb experiment Large Hadron Collider. For both number observed events consistent expectation from background Standard Model signal predictions. Upper limits on branching fractions are determined to be BR(Bs mu-) < 4.5 (3.8) x 10^-9 BR(B0 (0.81) 95% (90%) confidence level.
Abstract Using 34.7 pb −1 of data collected with the LHCb detector, inclusive production X (3872) meson in pp collisions at $\sqrt{s}=7\mbox{~TeV}$ is observed for first time. Candidates are selected (3872)→ J / ψπ + π − decay mode, and used to measure "Equation missing" where σ ( → (3872)+anything) cross section mesons rapidity range 2.5–4.5 transverse momentum 5–20 GeV/ c . In addition masses both ψ (2 S ) mesons, reconstructed final state, measured be $$m_{X(3872)} = 3871.95 \pm0.48 \...
Measurements of $b$ hadron production ratios in proton-proton collisions at a centre-of-mass energy 7 TeV with an integrated luminosity 3 pb$^{-1}$ are presented. We study the strange $B$ meson to light $f_s/(f_u+f_d)$ and $\Lambda_b^0$ baryon $f_{\Lambda_b}/(f_u+f_d)$ as function charmed hadron-muon pair transverse momentum $p_T$ pseudorapidity $\eta$, for between 0 14 GeV $\eta$ 2 5. find that is consistent being independent $p_{\rm T}$ we determine = 0.134$\pm$ 0.004 $^{+0.011}_{-0.010}$,...
The production of $J/\psi$ pairs in proton-proton collisions at a centre-of-mass energy 7 TeV has been observed using an integrated luminosity $37.5 pb^{-1}$ collected with the LHCb detector. cross-section for both \jpsi rapidity range $2<y^{J/\psi}<4.5$ and transverse momentum $p_{T}^{J/\psi}<10 GeV/c$ is $$ \sigma^{J/\psi J/\psi} = 5.1\pm1.0\pm1.1 nb,$$ where first uncertainty statistical second systematic.
In the Standard Model of particle physics, strength couplings b quark to u and c quarks, |Vub| |Vcb|, are governed by coupling quarks Higgs boson. Using data from LHCb experiment at Large Hadron Collider, probability for Λb0 baryon decay into p final state relative is measured. Combined with theoretical calculations strong interaction a previously measured value first measurement use baryonic performed. This consistent previous determinations using B meson decays specific states confirms...
Decays of b hadrons into final states containing a D0 meson and muon are used to measure the anti-b production cross-section in proton-proton collisions at centre-of-mass energy 7 TeV LHC. In pseudorapidity interval 2 < eta 6 integrated over all transverse momenta we find that average produce b-flavoured or anti-b-flavoured is (75.3 +/- 5.4 13.0) microbarns.
A bstract The relative production rate of $ B_s^0 and B 0 mesons is determined with the hadronic decays B_s^0\to D_s^{-}{\pi^{+}} → D − K + . measurement uses data corresponding to 1.0 fb −1 pp collisions at a centre-of-mass energy \sqrt{s}=7 TeV recorded in forward region LHCb experiment. ratio rates, f s /f d , measured be 238 ± 004 015 021, where first uncertainty statistical, second systematic, third theoretical. This combined previous obtain = 256 020. dependence on transverse momentum...
The ATLAS collaboration will upgrade its semiconductor pixel tracking detector with a new Insertable B-layer (IBL) between the existing and vacuum pipe of Large Hadron Collider. extreme operating conditions at this location have necessitated development radiation hard sensor technologies front-end readout chip, called FE-I4. Planar sensors 3D been investigated to equip layer, prototype modules using FE-I4A fabricated characterized 120 GeV pions CERN SPS 4 positrons DESY, before after module...
An angular analysis of the decay J/ψ→μ+μ- is performed to measure polarization prompt J/ψ mesons produced in pp collisions at [Formula: see text]. The dataset corresponds an integrated luminosity 0.37 fb-1 collected with LHCb detector. measurement presented as a function transverse momentum, pT, and rapidity, y, meson, kinematic region 2<pT<15 GeV/c 2.0<y<4.5.
Using pp collision data corresponding to an integrated luminosity of 1.0 fb(-1) and collected by LHCb in 2011 at a center-of-mass energy 7 TeV, we report the measurement direct CP violation B(s)(0)→K(-)π(+) decays, A(CP)(B(s)(0)→K(-)π(+)=0.27±0.04 (stat)±0.01 (syst), with significance exceeding 5 standard deviations. This is first observation decays B(s)(0) mesons. Furthermore, provide improved determination B(0)→K(+)π(-) A(CP)(B(0)→K(+)π(-)=-0.080±0.007 (stat)±0.003 which most precise this...