D. H. Cámpora Pérez
A5065885350- 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
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Nuclear physics research studies
- Stochastic processes and statistical mechanics
- Advanced Data Storage Technologies
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Educational Innovations and Technology
- International Science and Diplomacy
- Blockchain Technology Applications and Security
- Particle accelerators and beam dynamics
- Markov Chains and Monte Carlo Methods
- Media and Digital Communication
- Advanced NMR Techniques and Applications
Maastricht University
2021-2025
National Institute for Subatomic Physics
2020-2025
Wuhan University
2024
Cracow University of Technology
2023
University of Groningen
2022
Universidad de Las Tunas
2022
European Organization for Nuclear Research
2013-2021
Laboratoire d’Annecy de Physique des Particules
2021
Laboratoire de Mathématiques d'Orsay
2020-2021
Institute of Photonic Sciences
2020
Observations of exotic structures in the J/ψp channel, which we refer to as charmonium-pentaquark states, Λ0b→J/ψK−p decays are presented. The data sample corresponds an integrated luminosity 3 fb−1 acquired with LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysis three-body final state reproduces two-body mass angular distributions. To obtain a satisfactory fit seen spectrum, it is necessary include two Breit-Wigner amplitudes that each describe resonant state. significance...
A measurement of the ratio branching fractions $B^{+}\rightarrow K^{+}\mu^{+}\mu^{-}$ and K^{+}e^{+}e^{-}$ decays is presented using proton-proton collision data, corresponding to an integrated luminosity 3.0 fb$^{-1}$, recorded with LHCb experiment at center-of-mass energies 7 8 $\mathrm{\,Te\kern -0.1em V}$. The value for dilepton invariant mass squared range $1<q^{2}<6\mathrm{\,Ge\kern V^2\!/}c^4$ measured be $0.745^{+0.090}_{-0.074}\mathrm{\,(stat)}\,\pm0.036\mathrm{\,(syst)}$. This most...
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...
An angular analysis of the B 0 → K *0(→ + π −)μ μ − decay is presented. The dataset corresponds to an integrated luminosity 3.0 fb−1 pp collision data collected at LHCb experiment. complete information from used determine CP-averaged observables and CP asymmetries, taking account possible contamination decays with system in S-wave configuration. their correlations are reported bins q 2, invariant mass squared dimuon system. determined both unbinned maximum likelihood fit by using principal...
Resonant structures in B^{0}→ψ^{'}π^{-}K^{+} decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3 fb^{-1} collected with LHCb detector. The cannot be described K^{+}π^{-} resonances alone, which is confirmed model-independent approach. A highly significant Z(4430)^{-}→ψ^{'}π^{-} component required, thus confirming existence this state. observed evolution Z(4430)^{-} amplitude ψ^{'}π^{-} mass establishes resonant nature...
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 $$ {B}_s^0\to {\overline{D}}^0{f}_0(980) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>B</mml:mi><mml:mi>s</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo>→</mml:mo><mml:msup><mml:mover><mml:mi>D</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup><mml:msub><mml:mi>f</mml:mi><mml:mn>0</mml:mn></mml:msub><mml:mfenced><mml:mn>980</mml:mn></mml:mfenced></mml:math> decays is performed using 3 . 0 fb 1− of pp collision data...
An angular analysis and a measurement of the differential branching fraction decay B 0 → ϕμ + μ − are presented, using data corresponding to an integrated luminosity 3.0 fb−1 pp collisions recorded by LHCb experiment at $$ \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.
The isospin asymmetries of $B \to K\mu^+\mu^-$ and K^{*}\mu^+\mu^-$ decays the partial branching fractions $B^0 K^0\mu^+\mu^-$, $B^+ K^+\mu^+\mu^-$ K^{*+}\mu^+\mu^-$ are measured as functions dimuon mass squared, $q^2$. data used correspond to an integrated luminosity 3$~$fb$^{-1}$ from proton-proton collisions collected with LHCb detector at centre-of-mass energies 7$\,$TeV 8$\,$TeV in 2011 2012, respectively. both consistent Standard Model expectations. three fractions, while individually...
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...
Evidence for the decay mode $X(3872)\rightarrow\psi(2S)\gamma$ in $B^+\rightarrow X(3872)K^+$ decays is found with a significance of 4.4 standard deviations. The analysis based on data sample proton-proton collisions, corresponding to an integrated luminosity 3fb$^{-1}$ collected LHCb detector, at centre-of-mass energies 7 and 8TeV. ratio branching fraction $X(3872)\to\psi(2S)\gamma$ that $X(3872)\rightarrow J/\psi \gamma$ measured be $$...
The data sample of Λ0b→J/ψpK− decays acquired with the LHCb detector from 7 and 8 TeV pp collisions, corresponding to an integrated luminosity 3 fb−1, is inspected for presence J/ψp or J/ψK− contributions minimal assumptions about K−p contributions. It demonstrated at more than nine standard deviations that cannot be described alone, play a dominant role in this incompatibility. These model-independent results support previously obtained model-dependent evidence P+c→J/ψp...
A full amplitude analysis of $\Lambda_b^0 \to J/\psi p \pi^-$ decays is performed with a data sample acquired the LHCb detector from 7 and 8 TeV $pp$ collisions, corresponding to an integrated luminosity 3 fb$^{-1}$. significantly better description achieved when, in addition previously observed nucleon excitations $N\to p\pi^-$, either $P_c(4380)^+$ $P_c(4450)^+\to p$ states, K^-$ decays, or $Z_c(4200)^-\to state, reported $B^0 K^+ all three, are included models. The support model...
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.
A search is presented for hidden-sector bosons, $\ensuremath{\chi}$, produced in the decay ${B}^{0}\ensuremath{\rightarrow}{K}^{*}(892{)}^{0}\ensuremath{\chi}$, with ${K}^{*}(892{)}^{0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and $\ensuremath{\chi}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$. The performed using $pp$-collision data corresponding to $3.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected LHCb detector. No...
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...
The angular distribution and differential branching fraction of the decay $B^{0} \to K^{*0} \mu^{+}\mu^{-}$ are studied using a data sample, collected by LHCb experiment in $pp$ collisions at $\sqrt{s}=7\,{\rm TeV}$, corresponding to an integrated luminosity $1.0\,{\rm fb}^{-1}$. Several observables measured bins dimuon invariant mass squared, $q^{2}$. A first measurement zero-crossing point forward-backward asymmetry system is also presented. be $q_{0}^{2} = 4.9 \pm 0.9 \,{\rm...
A bstract The differential branching fraction of the rare decay Λ b 0 → Λμ + μ − is measured as a function q 2 , square dimuon invariant mass. analysis performed using proton-proton collision data, corresponding to an integrated luminosity 3 . fb −1 collected by LHCb experiment. Evidence signal observed in region below J/ψ Integrating over 15 < 20 GeV /c 4 $$ \mathrm{d}\mathrm{\mathcal{B}}\left({\varLambda}_b^0\to \varLambda {\mu}^{+}{\mu}^{-}\right)/d{q}^2=\left({1.18}_{-0.08}^{+0.09}\pm...
A measurement of the differential branching fraction decay B 0 → K ∗(892)0 μ + − is presented together with a determination S-wave π system in +π− −. The analysis based on pp-collision data corresponding to an integrated luminosity 3 fb−1 collected LHCb experiment. measurements are made bins invariant mass squared dimuon system, q 2. Precise theoretical predictions for decays available 2 region 1.1 < 6.0 GeV2 /c 4. In this region, range 796 m Kπ 996 MeV/c 2, found be $$...
The production of J/ψ mesons with rapidity 1.5 < y 4.0 or −5.0 −2.5 and transverse momentum p T 14 GeV/c is studied the LHCb detector in proton-lead collisions at a nucleon-nucleon centre-of-mass energy $ \sqrt{{{s_{NN }}}} = 5TeV. are reconstructed using dimuon decay mode. analysis based on data sample corresponding to an integrated luminosity about 1.6 nb−1. For first time nuclear modification factor forward-backward ratio determined separately for prompt from b-hadron decays. Clear...
The time-dependent $CP$ asymmetry in ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{+}{K}^{\ensuremath{-}}$ decays is measured using $pp$ collision data, corresponding to an integrated luminosity of $3.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected with the LHCb detector at center-of-mass energies 7 and 8 TeV. In a sample 96 000 decays, $CP$-violating phase ${\ensuremath{\phi}}_{s}$ measured, as well decay widths ${\mathrm{\ensuremath{\Gamma}}}_{\mathrm{L}}$...
A search for heavy Majorana neutrinos produced in the ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\mu}}^{\ensuremath{-}}$ decay mode is performed using $3\text{ }\text{ }{\text{fb}}^{\ensuremath{-}1}$ of integrated luminosity collected with LHCb detector $pp$ collisions at center-of-mass energies 7 and 8 TeV LHC. Neutrinos masses range 250 to 5000 MeV lifetimes from zero 1000 ps are probed. In absence a signal, upper...