A. Brea Rodríguez
A5031500050- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Stochastic processes and statistical mechanics
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Advanced Data Storage Technologies
- Radiation Detection and Scintillator Technologies
- Markov Chains and Monte Carlo Methods
- International Science and Diplomacy
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Radioactive Decay and Measurement Techniques
- Algorithms and Data Compression
- Probability and Statistical Research
- CCD and CMOS Imaging Sensors
Universidade de Santiago de Compostela
1997-2025
École Polytechnique Fédérale de Lausanne
2024-2025
Czech Academy of Sciences, Institute of Physics
2025
Science and Technology Corporation (Norway)
2024
Universitat de València
2023
Instituto de Física Corpuscular
2023
Peking University
2020
State Key Laboratory of Nuclear Physics and Technology
2020
University of Chinese Academy of Sciences
2020
Tsinghua University
2020
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...
An angular analysis of the $B^{0}\rightarrow K^{*0}(\to K^{+}\pi^{-})\mu^{+}\mu^{-}$ decay is presented using a data set corresponding to an integrated luminosity 4.7 fb$^{-1}$ $pp$ collision collected with LHCb experiment. The full $C\!P$-averaged observables are determined in bins invariant mass squared dimuon system. Contamination from decays $K^{+}\pi^{-}$ system S-wave configuration taken into account. tension seen between previous results and Standard Model predictions persists new...
Searches are performed for both promptlike and long-lived dark photons, A^{'}, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look A^{'}→μ^{+}μ^{-} decays using data sample corresponding to an integrated luminosity 5.5 fb^{-1} collected with the LHCb detector. Neither search finds evidence signal, 90% confidence-level exclusion limits placed on γ-A^{'} kinetic mixing strength. The A^{'} explores mass region from near dimuon threshold up 70 GeV...
We report four narrow peaks in the Ξ_{b}^{0}K^{-} mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity 9 fb^{-1} recorded by LHCb experiment. Referring these states their mass, values are m[Ω_{b}(6316)^{-}]=6315.64±0.31±0.07±0.50 MeV, m[Ω_{b}(6330)^{-}]=6330.30±0.28±0.07±0.50 m[Ω_{b}(6340)^{-}]=6339.71±0.26±0.05±0.50 m[Ω_{b}(6350)^{-}]=6349.88±0.35±0.05±0.50 where uncertainties statistical, systematic, last...
We describe a fully GPU-based implementation of the first level trigger for upgrade LHCb detector, due to start data taking in 2021. demonstrate that our implementation, named Allen, can process 40 Tbit/s rate upgraded detector and perform wide variety pattern recognition tasks. These include finding trajectories charged particles, proton-proton collision points, identifying particles as hadrons or muons, displaced decay vertices long-lived particles. further Allen be implemented around 500...
The results of an amplitude analysis the charmless three-body decay $B^+ \rightarrow \pi^+\pi^+\pi^-$, in which $C\!P$-violation effects are taken into account, reported. is based on a data sample corresponding to integrated luminosity $3 \text{fb}^{-1}$ $pp$ collisions recorded with LHCb detector. most challenging aspect description behaviour $\pi^+ \pi^-$ S-wave contribution, achieved by using three complementary approaches isobar model, K-matrix formalism, and quasi-model-independent...
Observations are reported of different sources CP violation from an amplitude analysis B^{+}→π^{+}π^{+}π^{-} decays, based on a data sample corresponding to integrated luminosity 3 fb^{-1} pp collisions recorded with the LHCb detector. A large asymmetry is observed in decay involving tensor f_{2}(1270) resonance, and addition significant found π^{+}π^{-}S wave at low invariant mass. The presence related interference between P B^{+}→ρ(770)^{0}π^{+} also established; this causes local...
The Λ_{c}^{+}K^{-} mass spectrum is studied with a data sample of pp collisions at center-of-mass energy 13 TeV corresponding to an integrated luminosity 5.6 fb^{-1} collected by the LHCb experiment. Three Ξ_{c}^{0} states are observed large significance and their masses natural widths measured be m[Ξ_{c}(2923)^{0}]=2923.04±0.25±0.20±0.14 MeV, Γ[Ξ_{c}(2923)^{0}]=7.1±0.8±1.8 m[Ξ_{c}(2939)^{0}]=2938.55±0.21±0.17±0.14 Γ[Ξ_{c}(2939)^{0}]=10.2±0.8±1.1 m[Ξ_{c}(2965)^{0}]=2964.88±0.26±0.14±0.14...
This report details the capabilities of LHCb and its upgrades towards study kaons hyperons. The analyses performed so far are reviewed, elaborating on prospects for some key decay channels, while proposing new measurements in to expand strangeness research program.
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...
A new baryon state is observed in the $$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} mass spectrum with high significance using a data sample of pp collisions, collected LHCb detector at centre-of-mass energies \sqrt{s} = 7, 8 and 13 TeV, corresponding to an integrated luminosity 9 fb−1. The natural width are measured be {\displaystyle \begin{array}{l}m=6072.3\pm 2.9\pm 0.6\pm 0.2\ \mathrm{MeV},\\ {}\Gamma =72\pm 11\pm 2\ \mathrm{MeV},\end{array}} where first uncertainty statistical second...
The production fraction of the ${B}_{c}^{\ensuremath{-}}$ meson with respect to sum ${B}^{\ensuremath{-}}$ and ${\overline{B}}^{0}$ mesons is measured in both 7 13 TeV center-of-mass (c.m.) energy $pp$ collisions produced by Large Hadron Collider (LHC), using LHCb detector. rate, approximately 3.7 per mille, does not change energy, but shows a transverse momentum dependence. ${B}_{c}^{\ensuremath{-}}\ensuremath{-}{B}_{c}^{+}$ asymmetry also consistent zero within determined statistical...
A search for the decays B_{s}^{0}→e^{+}e^{-} and B^{0}→e^{+}e^{-} is performed using data collected with LHCb experiment in proton-proton collisions at center-of-mass energies of 7, 8, 13 TeV, corresponding to integrated luminosities 1, 2, 2 fb^{-1}, respectively. No signal observed. Assuming no contribution from decays, an upper limit on branching fraction B(B_{s}^{0}→e^{+}e^{-})<9.4(11.2)×10^{-9} obtained 90(95)% confidence level. If assumed, a B(B^{0}→e^{+}e^{-})<2.5(3.0)×10^{-9}...
A search is presented for the lepton flavour violating decay $B^+ \rightarrow K^+ \mu^- \tau^+$ using a sample of proton--proton collisions at centre-of-mass energies 7, 8, and 13 TeV, collected with LHCb detector corresponding to total integrated luminosity 9 fb${}^{-1}$. The $\tau$ leptons are selected inclusively, primarily via decays single charged particle. four-momentum determined by $B^+$ mesons from $B_{s2}^{*0} B^+ K^-$ decays. No significant excess observed, an upper limit set on...
The ratio of the $\mathrm{B}^0_\mathrm{s}$ and $\mathrm{B}^+$ fragmentation fractions $f_\mathrm{s}$ $f_u$ is studied with $B^0_\mathrm{s}\to\mathrm{J}/\psi \phi $ $B^+\to\mathrm{J}/\psi K^+$ decays using data collected by LHCb experiment in proton-proton collisions at 7, 8 13$\text{ TeV}$ center-of-mass energies. analysis performed bins $\mathrm{B}$-meson momentum, longitudinal transverse pseudorapidity rapidity. fragmentation-fraction $f_\mathrm{s} / f_u$ observed to depend on momentum a...
A time-dependent analysis of the B_{s}^{0}→ϕγ decay rate is performed to determine CP -violating observables S_{ϕγ} and C_{ϕγ} mixing-induced observable A_{ϕγ}^{Δ}. The measurement based on a sample pp collision data recorded with LHCb detector, corresponding an integrated luminosity 3 fb^{-1} at center-of-mass energies 7 8 TeV. measured values are S_{ϕγ}=0.43±0.30±0.11, C_{ϕγ}=0.11±0.29±0.11, A_{ϕγ}^{Δ}=-0.67_{-0.41}^{+0.37}±0.17, where first uncertainty statistical second systematic. This...
A bstract precision measurement of the $$ {B}_c^{+} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>B</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup></mml:math> meson mass is performed using proton- proton collision data collected with LHCb experiment at centre-of-mass energies 7 , 8 and 13 TeV, corresponding to a total integrated luminosity 9 . 0 fb − 1 The mesons are reconstructed via decays → J/ψπ + π {B}_c^{+}\to J/\psi p\overline{p}{\pi}^{+}...
The LHCb experiment at CERN is undergoing an upgrade in preparation for the Run 3 data taking period of LHC. As part this trigger moving to a fully software implementation operating LHC bunch crossing rate. We present evaluation CPU-based and GPU-based first stage High Level Trigger. After detailed comparison both options are found be viable. This document summarizes performance details these options, outcome which has led choice as baseline.
A bstract measurement of the time-dependent CP-violating asymmetry in $$ {B}_s^0\to \phi <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:mi>ϕϕ</mml:mi> </mml:math> decays is presented. Using a sample proton-proton collision data corresponding to an integrated luminosity 5 . 0 fb − 1 collected by LHCb experiment at centre-of-mass energies \sqrt{s} <mml:msqrt> </mml:msqrt> =...
This paper presents an analysis of the $\Lambda^0_b\rightarrow J/\psi\Lambda$ angular distribution and transverse production polarisation $\Lambda^0_b$ baryons in proton-proton collisions at centre-of-mass energies 7, 8 13 TeV. The measurements are performed using data corresponding to integrated luminosity 4.9 fb$^{-1}$, collected with LHCb experiment. is determined a fiducial region momentum pseudorapidity $1 < p_{T} 20$ GeV$/c$ $2 \eta 5$, respectively. consistent being produced...
Brain-computer interfaces (BCIs) hold exciting therapeutic potential, but tissue damage caused by probe insertion limits channel count. Biohybrid devices, in which the cell-device interface is crafted laboratory, promise to address this limitation, these devices have lacked a demonstration of their applicability for BCI. We developed biohybrid approach engraft optogenetically-enabled neurons on cortical surface housed 2D-scaffold circular microwells. The engrafted survived, exhibited...
The production of $\mathit{\Xi}_{cc}^{++}$ baryons in proton-proton collisions at a centre-of-mass energy $\sqrt{s}=13$ TeV is measured the transverse-momentum range $4<p_\mathrm{T}<15~\mathrm{GeV}$/$c$ and rapidity $2.0<y<4.5$. data used this measurement correspond to an integrated luminosity 1.7 $\mathrm{fb}^{-1}$, recorded by LHCb experiment during 2016. ratio cross-section times branching fraction $\mathit{\Xi_{cc}^{++} \to \Lambda_{c}^{+} K^- \pi^+ \pi^+}$ decay relative prompt...
Abstract A model that can simultaneously explain Dark Matter relic density and the apparent matter anti-matter imbalance of universe has been recently proposed. The requires b -hadron branching fractions to at per mille level. -hadrons decay a dark sector baryon, $$\psi _{\mathrm{DS}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>ψ</mml:mi> <mml:mi>DS</mml:mi> </mml:msub> </mml:math> , which mass in region $$940 ~\mathrm{MeV}/c^2\le m_{\psi _{\mathrm{DS}}}\le...