A. Romero Vidal
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View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> Coulomb interaction study and its use in data processing
Coulomb interaction study and its use in data processing Open
In this work, the Coulomb effects (Coulomb correlations) in π+π− pairs produced in p+Ni collisions at 24 GeV/c, are studied using experimental π+π− pair distributions in Q, the relative momentum in the pair center-of-mass system (c.m.s.),…
View article: The π^+π^- Coulomb interaction study and its use in the data processing
The π^+π^- Coulomb interaction study and its use in the data processing Open
In this work the Coulomb effects (Coulomb correlations) in $π^+π^-$ pairs produced in p + Ni collisions at 24 GeV/$c$, are studied using experimental $π^+π^-$ pair distributions in $Q$, the relative momentum in the pair center of mass syst…
View article: Investigation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>K</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> pairs in the effective mass region near <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2</mml:mn><mml:msub><mml:mi>m</mml:mi><mml:mi>K</mml:mi></mml:msub></mml:math>
Investigation of pairs in the effective mass region near Open
The DIRAC experiment at CERN investigated in the reaction p(24 GeV/c)+Ni the particle pairs K+K-,π+π-, and pp¯ with relative momentum Q in the pair system less than 100 MeV/c. Because of background influence studies, DIRAC explored three…
View article: Recent results using semileptonic decays with LHCb
Recent results using semileptonic decays with LHCb Open
This document summarizes the measurements performed at the LHCb experiment using semileptonic $b$-hadron decays. Measurements of the CKM factor $|V_{ub}|$, lepton flavour universality tests by measuring the ratios $R(D^*)$ and $R(J/\psi)$,…
View article: Velo Upgrade Module Nomenclature
Velo Upgrade Module Nomenclature Open
The nomenclature and geometry of the various constituents of velo upgrade hybrid sensors are defined, as well as their position within the modules. The modules nomenclature and their position along the z-axis are defined.
View article: First Measurement of a Long-Lived <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math> Atom Lifetime
First Measurement of a Long-Lived Atom Lifetime Open
The adapted DIRAC experiment at the CERN PS accelerator observed for the first time long-lived hydrogenlike π^{+}π^{-} atoms, produced by protons hitting a beryllium target. A part of these atoms crossed the gap of 96 mm between the target…
View article: Review of lepton universality tests in <i>B</i> decays
Review of lepton universality tests in <i>B</i> decays Open
Several measurements of tree- and loop-level b-hadron decays performed in the\nrecent years hint at a possible violation of Lepton Universality. This article\npresents an experimental and theoretical overview of the current status of the\n…
View article: Low-Energy Antikaon Interaction with Nuclei: The AMADEUS Challenge
Low-Energy Antikaon Interaction with Nuclei: The AMADEUS Challenge Open
The low-energy strong interaction of antikaons (K -) with nuclei has many facets and represents a lively and challenging research field.It is interconnected to the peculiar role of strangeness, since the strange quark is rather light, but …
View article: Measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi><mml:mi>K</mml:mi></mml:math> atom lifetime and the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi><mml:mi>K</mml:mi></mml:math> scattering length
Measurement of the atom lifetime and the scattering length Open
After having announced the statistically significant observation\n(5.6~$\\sigma$) of the new exotic $\\pi K$ atom, the DIRAC experiment at the CERN\nproton synchrotron presents the measurement of the corresponding atom lifetime,\nbased on …
View article: Strangeness in the Universe? Low-Energy Kaon-Nuclei Interaction Studies with AMADEUS at the DAΦNE Collider
Strangeness in the Universe? Low-Energy Kaon-Nuclei Interaction Studies with AMADEUS at the DAΦNE Collider Open
View article: Spectroscopic Study of Hyperon Resonace Below \(\bar{K}\)<i>N</i> Threshold via the <i>d</i>(<i>K</i><sup>−</sup>, <i>n</i>) Reaction
Spectroscopic Study of Hyperon Resonace Below \(\bar{K}\)<i>N</i> Threshold via the <i>d</i>(<i>K</i><sup>−</sup>, <i>n</i>) Reaction Open
View article: Probing Strong Interaction with Kaonic Atoms — from DAΦNE to J-PARC
Probing Strong Interaction with Kaonic Atoms — from DAΦNE to J-PARC Open
View article: Investigating the low-energy K<sup>−</sup> interactions in nuclear matter with AMADEUS
Investigating the low-energy K<sup>−</sup> interactions in nuclear matter with AMADEUS Open
The AMADEUS collaboration studies low-energy K-interactions with light nuclei in order to clarify some aspects related to the behaviour of hadrons containing strangeness in nuclear medium. One of the main topics is the quest about the poss…
View article: Flavour physics and beyond the Standard Model Higgs bosons
Flavour physics and beyond the Standard Model Higgs bosons Open
Flavour physics plays a key role in the search for physics beyond the Standard Model. The in- direct searches for new Higgs bosons performed at LHCb and the B-factories complement the direct searches performed by ATLAS and CMS. This docume…
View article: Experimental studies of the kaon-nucleus interaction at low energy with x-ray spectroscopy of kaonic atoms
Experimental studies of the kaon-nucleus interaction at low energy with x-ray spectroscopy of kaonic atoms Open
In the exotic atoms in which one electron is replaced by a negatively charged kaon, the kaon-nucleus hadronic interaction introduces an energy shift and broadening of the low-lying states of the kaonic atoms. The shift and width can be det…
View article: Kaonic atoms and strangeness in nuclei: SIDDHARTA-2 and AMADEUS experiments
Kaonic atoms and strangeness in nuclei: SIDDHARTA-2 and AMADEUS experiments Open
The dynamics of the strong interaction processes in the non-perturbative regime is currently approached by lattice calculations and effective field theories (ChPT), still lacking several experimental results, fundamental for a good underst…
View article: Observation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>K</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Atoms
Observation ofandAtoms Open
The observation of hydrogen-like $\\pi K$ atoms, consisting of $\\pi^- K^+$ or $\\pi^+ K^-$ mesons, is presented. The atoms have been produced by 24 GeV/$c$ protons from the CERN PS accelerator, interacting with platinum or nickel foil tar…
View article: Upgraded DIRAC spectrometer at CERN PS for the investigation of ππ and πK atoms
Upgraded DIRAC spectrometer at CERN PS for the investigation of ππ and πK atoms Open
View article: Low-energy Antikaon Interaction with Nuclei: The AMADEUS Challenge
Low-energy Antikaon Interaction with Nuclei: The AMADEUS Challenge Open
The low-energy strong interaction of antikaons (K-) with nuclei has many facets and rep- resents a lively and challenging research field. It is interconnected to the peculiar role of strangeness, since the strange quark is rather light, bu…
View article: Structure near the<i>K<sup>−</sup>+ p + p</i>threshold in the in-flight<sup>3</sup>He(<i>K</i><sup>−</sup>, Λ<i>p</i>)<i>n</i>reaction
Structure near the<i>K<sup>−</sup>+ p + p</i>threshold in the in-flight<sup>3</sup>He(<i>K</i><sup>−</sup>, Λ<i>p</i>)<i>n</i>reaction Open
To search for an S = -1 di-baryonic state which decays to p, the ^3He(Kp)nmissing reaction was studied at 1.0 GeV/c. Unobserved neutrons were kinematically identified from the missing mass M_X of the ^3He(Kp)X reaction in order to have a l…
View article: K -series X-ray yield measurement of kaonic hydrogen atoms in a gaseous target
K -series X-ray yield measurement of kaonic hydrogen atoms in a gaseous target Open
View article: Strong interaction studies with kaonic atoms
Strong interaction studies with kaonic atoms Open
\nThe strong interaction of antikaons (K−) with nucleons and nuclei in the low-energy regime represents an active research field connected intrinsically with few-body physics. There are important open questions like the question of antikao…
View article: Recovery Time Measurements of Silicon Photomultipliers Using a Pulsed Laser
Recovery Time Measurements of Silicon Photomultipliers Using a Pulsed Laser Open
We performed an experimental study to determine the pixel recovery time of various Multi Pixel Photon Counters (MPPCs) in order to characterize their rate capability and double-hit resolution.The recovery time constant and its dependence o…
View article: SIDDHARTA results and implications of the results on antikaon-nucleon interaction
SIDDHARTA results and implications of the results on antikaon-nucleon interaction Open
The interaction of antikaons (K-) with nucleons and nuclei in the low-energy regime represents an active research field in hadron physics. There are important open questions like the existence of antikaon nuclear bound states like the prot…
View article: Future projects of light kaonic atom X-ray spectroscopy
Future projects of light kaonic atom X-ray spectroscopy Open
X-ray spectroscopy of light kaonic atoms is a unique tool to provide precise information on the fundamental KN interaction at the low-energy limit and the in-medium nuclear interaction of K-. The future experiments of kaonic deuterium stro…
View article: Study of the elementary (K−, n) reactions to search for the K¯NN bound state via the 3He (K−, n) reaction at J-PARC
Study of the elementary (K−, n) reactions to search for the K¯NN bound state via the 3He (K−, n) reaction at J-PARC Open
We have searched for the simplest kaonic nuclear state, K̄NN, using the in-flight 3He (K-, n) reaction at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at θnlab=0°, an excess of yield was obser…
View article: Recovery Time Measurements of Silicon Photomultipliers Using a Pulsed Laser
Recovery Time Measurements of Silicon Photomultipliers Using a Pulsed Laser Open
We performed an experimental study to determine the pixel recovery time of various Multi Pixel Photon Counters (MPPCs) in order to characterize their rate capability and double-hit resolution. The recovery time constant and its dependence …
View article: First observation of long-lived π+π− atoms
First observation of long-lived π+π− atoms Open
View article: Spectroscopic Study of Hyperon Resonances below \(\bar{K}N\) Threshold via the \(\left( K^{ - },n \right)\) Reaction on Deuteron
Spectroscopic Study of Hyperon Resonances below \(\bar{K}N\) Threshold via the \(\left( K^{ - },n \right)\) Reaction on Deuteron Open
View article: Strong interaction studies with kaonic atoms
Strong interaction studies with kaonic atoms Open
The strong interaction of antikaons (K-) with nucleons and nuclei in the low energy regime represents an active research field connected intrinsically with few-body physics. There are important open questions like the question of antikaon …