Search results for "Lep"
showing 10 items of 3622 documents
"Table 1" of "Improved measurements of electroweak parameters from Z decays into fermion pairs"
1991
Statistical errors only.
"Table 10" of "Update of electroweak parameters from Z decays"
1993
Data from 1991 running period.
"Table 25" of "Measurements of the line shape of the Z0 and determination of electroweak parameters from its hadronic and leptonic decays"
1994
LEPTON+ LEPTON- forward-backward asymmetries from the 1991 data set. Data are corrected for t-channel subtraction, and to full solid angle but not for momenta and accollinearity cuts. Additional systematic uncertainty, excluding luminosity, is 0.0025.
"Table 23" of "Measurements of the line shape of the Z0 and determination of electroweak parameters from its hadronic and leptonic decays"
1994
LEPTON+ LEPTON- cross sections from the 1991 data set. Data are corrected for t-channel subtraction, and to full solid angle but not for momenta and accollinearity cuts. Additional systematic uncertainty, excluding luminosity, is 0.4 pct.
Hallazgos histológicos y ultraestructurales en áreas de displasia cortical focal de pacientes pediátricos intervenidos por epilepsia refractaria
2022
Las malformaciones del desarrollo cortical (MDC) comprenden un amplio grupo de enfermedades malformativas del desarrollo de la corteza cerebral, que pueden conducir a crisis epilépticas, habitualmente refractarias a tratamiento médico, en la infancia o la juventud. La displasia cortical focal (DCF) es reconocida como una de las MDC más epileptogénica y se clasifica en tres subtipos dependiendo del tipo de diseminación cortical (radial o tangencial) y la presencia o ausencia de alteraciones citológicas (neuronas dismórficas y/o células en balón). Muchas proteínas relacionadas con la migración neuronal y neurogénesis, como la Doblecortina (DCX) se han estudiado en este tipo de patologías. La …
Measurement of the top quark pair production cross section in proton-proton collisions at center-of-mass energies of 7 TeV in final states with a tau…
2014
El Modelo Estándar (SM) de la Física de Partículas es una teoría cuántica de campos desarrollada en los años 60 para explicar el comportamiento de las partículas elementales y las fuerzas fundamentales que gobiernan sus interacciones. El Modelo Estándar ha sido comprobado experimentalmente, ha pronosticado con gran precisión una amplia variedad de fenómenos y ha explicado con éxito numerosos resultados experimentales. Para la exploración de fenómenos de nueva Física, la Organización Europea para la Investigación Nuclear (CERN) ha construido un acelerador y colisionador de partículas, el Gran Colisionador de Hadrones, LHC. El acelerador, los detectores y la infraestructura informática necesa…
High precision measurement of Gamma(Z->bbbar)/Gamma(Z->hadrons) with the DELPHI detector at LEP collider
1997
Entre las medidas disponibles a la energía en centro de masas correspondiente al polo del bosón Z, la fracción de la anchura parcial a pares de quarks bbbar y su anchura parcial hadrónica, Rb0 = Gamma(Z -> bbbar) / Gamma(Z -> hadrones),tiene actualmente un especial interés. Prácticamente todas las correcciones radiativas electrodébiles y de QCD cancelan al realizar el cociente, de forma que Rb0 es esencialmente sensible sólo a las correcciones al vértice Z -> bbbar, como el fuerte acoplamiento CKM al quark top. Dado el excelente acuerdo entre el Modelo Estándar y la mayor parte de las observaciones de precisión, junto con el reciente descubrimiento del quark top y la determinación directa d…
Search for a Dark Leptophilic Scalar in e(+) e(-) Collisions
2020
Many scenarios of physics beyond the standard model predict the existence of new gauge singlets, which might be substantially lighter than the weak scale. The experimental constraints on additional scalars with masses in the MeV to GeV range could be significantly weakened if they interact predominantly with leptons rather than quarks. At an e+e- collider, such a leptophilic scalar (φL) would be produced predominantly through radiation from a τ lepton. We report herein a search for e+e-→τ+τ-φL, φL→ℓ+ℓ- (ℓ=e, μ) using data collected by the BABAR experiment at SLAC. No significant signal is observed, and we set limits on the φL coupling to leptons in the range 0.04<mφL<7.0 GeV. These bounds s…
Observation and Measurement of Forward Proton Scattering in Association with Lepton Pairs Produced via the Photon Fusion Mechanism at ATLAS
2020
The observation of forward proton scattering in association with lepton pairs (eþe− þ p or μþμ− þ p) produced via photon fusion is presented. The scattered proton is detected by the ATLAS Forward Proton spectrometer, while the leptons are reconstructed by the central ATLAS detector. Proton-proton collision data recorded in 2017 at a center-of-mass energy of ffiffiffi s p ¼ 13 TeV are analyzed, corresponding to an integrated luminosity of 14.6 fb−1. A total of 57 (123) candidates in the ee þ p (μμ þ p) final state are selected, allowing the background-only hypothesis to be rejected with a significance exceeding 5 standard deviations in each channel. Proton-tagging techniques are introduced f…
Study of cosmic ray events with high muon multiplicity using the ALICE detector at the CERN Large Hadron Collider
2016
ALICE is one of four large experiments at the CERN Large Hadron Collider near Geneva, specially designed to study particle production in ultra-relativistic heavy-ion collisions. Located 52 meters underground with 28 meters of overburden rock, it has also been used to detect muons produced by cosmic ray interactions in the upper atmosphere. In this paper, we present the multiplicity distribution of these atmospheric muons and its comparison with Monte Carlo simulations. This analysis exploits the large size and excellent tracking capability of the ALICE Time Projection Chamber. A special emphasis is given to the study of high multiplicity events containing more than 100 reconstructed muons a…