A5001235648- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Medical Imaging Techniques and Applications
- Computational Physics and Python Applications
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Nuclear physics research studies
- Astronomy and Astrophysical Research
- Stochastic processes and statistical mechanics
- Black Holes and Theoretical Physics
- Laser-Matter Interactions and Applications
- Superconducting Materials and Applications
- Silicon Effects in Agriculture
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Spacecraft and Cryogenic Technologies
- Algorithms and Data Compression
- Solar and Space Plasma Dynamics
- Molecular Junctions and Nanostructures
- Planetary Science and Exploration
University of Oxford
2024
University of Manchester
2012-2023
European Organization for Nuclear Research
2015-2020
University of Glasgow
2012
A narrow pentaquark state, P_{c}(4312)^{+}, decaying to J/ψp, is discovered with a statistical significance of 7.3σ in data sample Λ_{b}^{0}→J/ψpK^{-} decays, which an order magnitude larger than that previously analyzed by the LHCb Collaboration. The P_{c}(4450)^{+} structure formerly reported confirmed and observed consist two overlapping peaks, P_{c}(4440)^{+} P_{c}(4457)^{+}, where this two-peak interpretation 5.4σ. proximity Σ_{c}^{+}D[over ¯]^{0} ¯]^{*0} thresholds peaks suggests they...
The determination of track reconstruction efficiencies at LHCb using J/ψ→μ+μ- decays is presented. Efficiencies above 95% are found for the data taking periods in 2010, 2011, and 2012. ratio efficiency muons simulation compatible with unity measured an uncertainty 0.8 % a precision 0.4 2011 For hadrons additional 1.4 due to material interactions assumed. This result crucial accurate cross section branching fraction measurements LHCb.
The charmless decays $B^{\pm}\to K^{\pm}\pi^+\pi^-$ and K^{\pm}K^+K^-$ are reconstructed using data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected by LHCb in 2011. inclusive charge asymmetries these modes measured as $A_{C\!P}(B^{\pm}\to K^{\pm}\pi^+\pi^-) = 0.032 \pm 0.008 \stat 0.004 \syst 0.007 (J\psi K^{\pm})$ K^{\pm}K^+K^-) -0.043 0.009 0.003 K^{\pm})$, where the third uncertainty is due $C\!P$ asymmetry J\psi K^{\pm}$ reference mode. significance K^{\pm}K^+K^-)$...
Measuring cross-sections at the LHC requires luminosity to be determined accurately each centre-of-mass energy $\sqrt{s}$. In this paper results are reported from calibrations carried out interaction point 8 with LHCb detector for $\sqrt{s}$ = 2.76, 7 and TeV (proton-proton collisions) $\sqrt{s_{NN}}$ 5 (proton-lead collisions). Both "van der Meer scan" "beam-gas imaging" calibration methods were employed. It is observed that beam density profile cannot always described by a function...
The production fractions of $\overline{B}_s^0$ and $\Lambda_b^0$ hadrons, normalized to the sum $B^-$ $\overline{B}^0$ fractions, are measured in 13 TeV pp collisions using data collected by LHCb experiment, corresponding an integrated luminosity 1.67/fb. These ratios, averaged over $b$-hadron transverse momenta from 4 25 GeV pseudorapidity 2 5, $0.122 \pm 0.006$ for $\overline{B}_s^0$, $0.259 0.018$ $\Lambda_b^0$, where uncertainties arise both statistical systematic sources. ratio depends...
Measurements of ${B}_{c}^{+}$ production and mass are performed with the decay mode ${B}_{c}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}$ using $0.37\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data collected in $pp$ collisions at $\sqrt{s}=7\text{ }\mathrm{TeV}$ by LHCb experiment. The ratio cross section times branching fraction between ${B}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{+}$ decays is measured to be...
Results are reported from a search for the rare decays ${B}_{s}^{0}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}}$ and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}}$, where $\ensuremath{\tau}$ lepton is reconstructed in channel...
The production of prompt charged particles in proton-lead collisions and proton-proton at the nucleon-nucleon center-of-mass energy $\sqrt{{s}_{NN}}=5\text{ }\text{ }\mathrm{TeV}$ is studied LHCb as a function pseudorapidity ($\ensuremath{\eta}$) transverse momentum (${p}_{T}$) with respect to proton beam direction. nuclear modification factor for determined $\ensuremath{\eta}$ between $\ensuremath{-}4.8<\ensuremath{\eta}<\ensuremath{-}2.5$ (backward region) $2.0<\ensuremath{\eta}<4.8$...
The first observation of the decays Λb0→χc1pK− and Λb0→χc2pK− is reported using a data sample corresponding to an integrated luminosity 3.0 fb−1, collected by LHCb experiment in pp collisions at center-of-mass energies 7 8 TeV. following ratios branching fractions are measured: B(Λb0→χc1pK−)B(Λb0→J/ψpK−)=0.242±0.014±0.013±0.009,B(Λb0→χc2pK−)B(Λb0→J/ψpK−)=0.248±0.020±0.014±0.009,B(Λb0→χc2pK−)B(Λb0→χc1pK−)=1.02±0.10±0.02±0.05,where uncertainty statistical, second systematic, third due on...
A search is performed for the central exclusive production of pairs charmonia produced in proton-proton collisions. Using data corresponding to an integrated luminosity collected at centre-of-mass energies 7 and 8 TeV, are observed, which have been absence any other activity inside LHCb acceptance that sensitive charged particles pseudorapidity ranges . Searches also P-wave limits set on their production. The cross-sections these processes, where dimeson system has a rapidity between 2.0...
A search for decay-time-dependent charge-parity ($CP$) asymmetry in ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ and ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays is performed at the LHCb experiment using proton-proton collision data recorded a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity $5.4\text{ }\text{ }{\text{fb}}^{\ensuremath{-}1}$. The ${D}^{0}$ mesons are required originate from...
A bstract search for the lepton-flavour violating decays B 0 → K *0 μ ± e ∓ and $$ {B}_s^0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> ϕμ is presented, using proton-proton collision data collected by LHCb detector at LHC, corresponding to an integrated luminosity of 9 fb − 1 . No significant signals are observed upper limits {\displaystyle \begin{array}{c}\mathcal{B}\left({B}^0\to...
The production of prompt D^{0} mesons in proton-lead collisions both the forward and backward rapidity regions at a center-of-mass energy per nucleon pair sqrt[s_{NN}]=8.16 TeV is measured by LHCb experiment. nuclear modification factor determined as function transverse momentum p_{T}, nucleon-nucleon frame y^{*}. In region, significantly suppressed with respect to pp measured, which provides significant constraints on models parton distributions hadron down very low Bjorken-x region...
A bstract We report on a measurement of the $$ {\Lambda}_c^{+} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> to D 0 production ratio in peripheral PbPb collisions at \sqrt{s_{\textrm{NN}}} <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>NN</mml:mi> </mml:msub> </mml:msqrt> = 5 . 02 TeV with LHCb detector forward rapidity region 2 < y 4 5. The ( ) hadrons are reconstructed via...
We present a measurement of the ratio B¯s⁰ meson lifetime, in flavor-specific decay to Ds⁺π⁻, that B¯⁰ meson. The pp collision data used correspond an integrated luminosity 1 fb(-1), collected with LHCb detector, at center-of-mass energy 7 TeV. Combining our measured value 1.010±0.010±0.008 for this known we determine lifetime be τ(B¯s⁰ )=1.535±0.015±0.014 ps, where uncertainties are statistical and systematic, respectively. This is most precise date, consistent previous measurements...
Measurements of the branching fractions and decays are performed using a data sample corresponding to proton-proton collision collected with LHCb detector at centre-of-mass energy , where mesons reconstructed in final state. The first observation decay evidence for reported
The first untagged decay-time-integrated amplitude analysis of $B^{0}_{s} \rightarrow K^{0}_{\textrm{S}} K^{\pm}\pi^{\mp}$ decays is performed using a sample corresponding to $3.0\,$fb$^{-1}$ $pp$ collision data recorded with the LHCb detector during 2011 and 2012. are described an model that contains contributions from intermediate resonances $K^{*}(892)^{0,+}$, $K^*_2(1430)^{0,+}$ $K^*_0(1430)^{0,+}$, their charge conjugates. Measurements branching fractions decay modes...
A bstract The inclusive D s ± production asymmetry is measured in pp collisions collected by the LHCb experiment at centre-of-mass energies of $$ \sqrt{s}=7 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>7</mml:mn> </mml:math> and 8 TeV. Promptly produced mesons are used, which decay as → ϕ π , with K + − . measurement performed bins transverse momentum, p T rapidity, y covering range 2 5 < 25 0 GeV/c 4 5....
1. European Organization for Nuclear Research (CERN), Gen`eve, Switzerland2. DAPNIA, Centre d’´Etudes Nucl´eaires de Saclay (CEA-Saclay), Gif-sur-Yvett e, France3. Technische Universita¨t Darmstadt, IKP, Germany4. Max-Planck-Institut fu¨r extraterrestrische Physik, Garching, Germany5. Instituto F´isica y Altas Energ´ias, Universidad Zaragoza, Spain6. Enrico Fermi Institute and KICP, University of Chicago, IL, USA7. Aristotle Thessaloniki, Greece8. National Center Scientific “Demokritos”,...
We have started the development of a detector system, sensitive to single photons in eV energy range, be suitably coupled one CAST magnet ports. This system should open window on possible detection low Axion Like Particles emitted by sun. Preliminary tests involved cooled photomultiplier tube via Galileian telescope and switched 40 m long optical fiber. has reached limit background level alone ideal conditions, two solar tracking runs been performed with it at CAST. Such measurement never...
Artificial molecular motors are at the forefront of research in nanotechnology due to their ability perform tasks by harnessing directionally controlled motion scale. In particular, development light-driven nanomotors is a challenging task that nonetheless holds great potential for sunlight-powered systems and active materials. Herein, we describe novel azoimidazolium photochemical rotary motor which operates along triangular reaction cycle taking advantage formation diastereomeric species...