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Papers by Sergio Gonzalez

Fuel and Energy Abstracts, 2011

A measurement of the Z/γ⁎Z/γ⁎ transverse momentum (pTZ) distribution in proton–proton collisions ... more A measurement of the Z/γ⁎Z/γ⁎ transverse momentum (pTZ) distribution in proton–proton collisions at s=7 TeV is presented using Z/γ⁎→e+e−Z/γ⁎→e+e− and Z/γ⁎→μ+μ−Z/γ⁎→μ+μ− decays collected with the ATLAS detector in data sets with integrated luminosities of 35 pb−1 and 40 pb−1, respectively. The normalized differential cross sections are measured separately for electron and muon decay channels as well as for their combination up to pTZ of 350 GeV for invariant dilepton masses 66 GeV<mℓℓ<116 GeV66 GeV<mℓℓ<116 GeV. The measurement is compared to predictions of perturbative QCD and various event generators. The prediction of resummed QCD combined with fixed order perturbative QCD is found to be in good agreement with the data.

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2007

This paper describes the AC-coupled, single-sided, p-in-n silicon microstrip sensors used in the ... more This paper describes the AC-coupled, single-sided, p-in-n silicon microstrip sensors used in the Semiconductor Tracker (SCT) of the ATLAS experiment at the CERN Large Hadron Collider (LHC). The sensor requirements, specifications and designs are discussed, together with the qualification and quality assurance procedures adopted for their production. The measured sensor performance is presented, both initially and after irradiation to the fluence anticipated after 10 years of LHC operation. The sensors are now successfully assembled within the detecting modules of the SCT, and the SCT tracker is completed and integrated within the ATLAS Inner Detector. Hamamatsu Photonics Ltd. supplied 92.2% of the 15,392 installed sensors, with the remainder supplied by CiS.

Fuel and Energy Abstracts, 2011

A measurement of the cross-section for ϒ(1S)→μ+μ−ϒ(1S)→μ+μ− production in proton–proton collision... more A measurement of the cross-section for ϒ(1S)→μ+μ−ϒ(1S)→μ+μ− production in proton–proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the ϒ(1S)ϒ(1S) transverse momentum in two bins of rapidity, |yϒ(1S)|<1.2|yϒ(1S)|<1.2 and 1.2<|yϒ(1S)|<2.41.2<|yϒ(1S)|<2.4. The measurement requires that both muons have transverse momentum pTμ>4 GeV and pseudorapidity |ημ|<2.5|ημ|<2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarisation. The results are based on an integrated luminosity of 1.13 pb−1, collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in Pythia while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet model.

Esta práctica, por sus características, seguirá un procedimiento de evaluación diferente al de la... more Esta práctica, por sus características, seguirá un procedimiento de evaluación diferente al de las demás, como ya se ha comentado en clase. No habrá un test al comienzo. En su lugar los elementos susceptibles de evaluación serán la prepráctica y la realización de la sesión práctica. Así pues, en este caso, si no obligatoria, sí es conveniente la entrega de la solución de la prepráctica a la entrada de la sesión práctica, ya que influirá en la nota. Dicha solución deberá ser manuscrita y ocupará una sola hoja. En ejecución de la práctica se cargarán en el autómata los diseños propuestos en la prepráctica (lleve una copia, pues el original se lo queda el profesor) y se probará su correcto funcionamiento, respondiendo a las preguntas y modificaciones planteadas por los profesores.

Fuel and Energy Abstracts, 2011

A measurement of the Z/γ⁎Z/γ⁎ transverse momentum (pTZ) distribution in proton–proton collisions ... more A measurement of the Z/γ⁎Z/γ⁎ transverse momentum (pTZ) distribution in proton–proton collisions at s=7 TeV is presented using Z/γ⁎→e+e−Z/γ⁎→e+e− and Z/γ⁎→μ+μ−Z/γ⁎→μ+μ− decays collected with the ATLAS detector in data sets with integrated luminosities of 35 pb−1 and 40 pb−1, respectively. The normalized differential cross sections are measured separately for electron and muon decay channels as well as for their combination up to pTZ of 350 GeV for invariant dilepton masses 66 GeV<mℓℓ<116 GeV66 GeV<mℓℓ<116 GeV. The measurement is compared to predictions of perturbative QCD and various event generators. The prediction of resummed QCD combined with fixed order perturbative QCD is found to be in good agreement with the data.

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2007

This paper describes the AC-coupled, single-sided, p-in-n silicon microstrip sensors used in the ... more This paper describes the AC-coupled, single-sided, p-in-n silicon microstrip sensors used in the Semiconductor Tracker (SCT) of the ATLAS experiment at the CERN Large Hadron Collider (LHC). The sensor requirements, specifications and designs are discussed, together with the qualification and quality assurance procedures adopted for their production. The measured sensor performance is presented, both initially and after irradiation to the fluence anticipated after 10 years of LHC operation. The sensors are now successfully assembled within the detecting modules of the SCT, and the SCT tracker is completed and integrated within the ATLAS Inner Detector. Hamamatsu Photonics Ltd. supplied 92.2% of the 15,392 installed sensors, with the remainder supplied by CiS.

Fuel and Energy Abstracts, 2011

A measurement of the cross-section for ϒ(1S)→μ+μ−ϒ(1S)→μ+μ− production in proton–proton collision... more A measurement of the cross-section for ϒ(1S)→μ+μ−ϒ(1S)→μ+μ− production in proton–proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the ϒ(1S)ϒ(1S) transverse momentum in two bins of rapidity, |yϒ(1S)|<1.2|yϒ(1S)|<1.2 and 1.2<|yϒ(1S)|<2.41.2<|yϒ(1S)|<2.4. The measurement requires that both muons have transverse momentum pTμ>4 GeV and pseudorapidity |ημ|<2.5|ημ|<2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarisation. The results are based on an integrated luminosity of 1.13 pb−1, collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in Pythia while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet model.

Esta práctica, por sus características, seguirá un procedimiento de evaluación diferente al de la... more Esta práctica, por sus características, seguirá un procedimiento de evaluación diferente al de las demás, como ya se ha comentado en clase. No habrá un test al comienzo. En su lugar los elementos susceptibles de evaluación serán la prepráctica y la realización de la sesión práctica. Así pues, en este caso, si no obligatoria, sí es conveniente la entrega de la solución de la prepráctica a la entrada de la sesión práctica, ya que influirá en la nota. Dicha solución deberá ser manuscrita y ocupará una sola hoja. En ejecución de la práctica se cargarán en el autómata los diseños propuestos en la prepráctica (lleve una copia, pues el original se lo queda el profesor) y se probará su correcto funcionamiento, respondiendo a las preguntas y modificaciones planteadas por los profesores.