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CERN Document Server Encontrados 221 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 0.61 segundos. 
1.
Flavour tagged time dependent angular analysis of the $B_s \rightarrow J/\psi \phi$ decay and extraction of $\Delta\Gamma$ and the weak phase $\phi_s$ in ATLAS / ATLAS Collaboration
A measurement of the $B_s \rightarrow J/\psi \phi$ decay parameters, updated to include flavour tagging is reported using $4.9 fb^{-1}$ of integrated luminosity collected by the ATLAS detector from $\sqrt{s}= 7$TeV $pp$ collisions recorded in 2011 at the LHC. The values measured for the physical parameters are: \begin{eqnarray*} \phi_s & = & 0.12 \pm 0.25(stat.)\pm 0.05(syst.)rad \\ \Delta\Gamma & = & 0.053 \pm 0.021(stat.) 0.010(syst.)ps^{-1} \\ \Gamma_s & = & 0.677 \pm 0.007 (stat.)\pm 0.004 (syst.)ps^{-1}\\ |A_{\parallel}(0)|^2 & = & 0.220 \pm 0.008 (stat.)\pm 0.009(syst.)\\ |A_{0}(0)|^2 & = & 0.529 \pm 0.006 (stat.)\pm 0.012(syst.)\\ \delta_\perp & = & 3.89 \pm 0.47(stat.) \pm 0.11(syst.)rad \end{eqnarray*} where the parameter $\Delta\Gamma$ is constrained to be positive. [...]
arXiv:1407.1796; CERN-PH-EP-2014-043; CERN-PH-EP-2014-043.- Geneva : CERN, 2014-09-23 - 26 p. - Published in : Phys. Rev. D 90 (2014) 052007 APS Open Access article: PDF; Fulltext: PDF; External link: Preprint
2.
Light-quark and gluon jet discrimination in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector / ATLAS Collaboration
A likelihood-based discriminant for the identification of quark- and gluon-initiated jets is built and validated using 4.7 fb$^{-1}$ of proton--proton collision data at $\sqrt{s}=7$ TeV collected with the ATLAS detector at the LHC.  Data samples with enriched quark or gluon content are used in the construction and validation of templates of jet properties that are the input to the likelihood-based discriminant. [...]
arXiv:1405.6583; CERN-PH-EP-2014-058; CERN-PH-EP-2014-058.- Geneva : CERN, 2014-08-21 - 29 p. - Published in : Eur. Phys. J. C 74 (2014) 3023 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Fulltext from Publisher: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint
3.
Operation and performance of the ATLAS semiconductor tracker / ATLAS Collaboration
The semiconductor tracker is a silicon microstrip detector forming part of the inner tracking system of the ATLAS experiment at the LHC. The operation and performance of the semiconductor tracker during the first years of LHC running are described. [...]
arXiv:1404.7473; CERN-PH-EP-2014-049; CERN-PH-EP-2014-049.- Geneva : CERN, 2014-08 - 80 p. - Published in : JINST 9 (2014) P08009 Fulltext: 10.1088_1748-0221_9_08_P08009 - PDF; IDET-2013-01-sct2011 - PDF; arXiv:1404.7473 - PDF; IOP Open Access article: PDF; External links: Preprint; Previous draft version
4.
Search for supersymmetry at $\sqrt{s}=8$ TeV in final states with jets and two same-sign leptons or three leptons with the ATLAS detector / ATLAS Collaboration
A search for strongly produced supersymmetric particles is conducted using signatures involving multiple energetic jets and either two isolated leptons ($e$ or $\mu$) with the same electric charge, or at least three isolated leptons. The search also utilises jets originating from $b$-quarks, missing transverse momentum and other observables to extend its sensitivity. [...]
arXiv:1404.2500; CERN-PH-EP-2014-044; CERN-PH-EP-2014-044.- Geneva : CERN, 2014 - 50 p. - Published in : JHEP 06 (2014) 035 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint
5.
Electron reconstruction and identification efficiency measurements with the ATLAS detector using the 2011 LHC proton-proton collision data / ATLAS Collaboration
The electron reconstruction and identification efficiencies of the ATLAS detector at the LHC have been evaluated using proton-proton collision data collected in 2011 at $\sqrt{s}$ = 7 TeV and corresponding to an integrated luminosity of 4.7 fb$^{-1}$. Tag-and-probe methods using events with leptonic decays of $W$ and $Z$ bosons and $J/\psi$ mesons are employed to benchmark these performance parameters. [...]
arXiv:1404.2240; CERN-PH-EP-2014-040; CERN-PH-EP-2014-040.- Geneva : CERN, 2014-07-15 - 38 p. - Published in : Eur. Phys. J. C (2014) 74:2941 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint
6.
Measurement of the low-mass Drell--Yan differential cross section at √s = 7 TeV using the ATLAS detector / ATLAS Collaboration
The differential cross section for the process $Z/\gamma^*\rightarrow \ell\ell$ ($\ell=e,\mu$) as a function of dilepton invariant mass is measured in $pp$ collisions at $\sqrt{s}=7$ TeV at the LHC using the ATLAS detector. The measurement is performed in the $e$ and $\mu$ channels for invariant masses between $26$ GeV and $66$ GeV using an integrated luminosity of $1.6$ fb$^{-1}$ collected in 2011 and these measurements are combined. [...]
arXiv:1404.1212; CERN-PH-EP-2014-020; CERN-PH-EP-2014-020.- Geneva : CERN, 2014 - 46 p. - Published in : JHEP 06 (2014) 112 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Rivet analyses reference
7.
Measurement of the parity-violating asymmetry parameter $\alpha_b$ and the helicity amplitudes for the decay $\Lambda_b^0\to J/\psi\Lambda^0$ with the ATLAS detector / ATLAS Collaboration
A measurement of the parity-violating decay asymmetry parameter, $\alpha_b$, and the helicity amplitudes for the decay $\Lambda_b^0\to J/\psi(\mu^+\mu^-) \Lambda^0 (p\pi^-)$ is reported. The analysis is based on 1400 $\Lambda_b^0$ and $\bar{\Lambda}_b^0$ baryons selected in $4.6~\rm{fb}^{-1}$ of proton--proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. [...]
arXiv:1404.1071; CERN-PH-EP-2014-034; CERN-PH-EP-2014-034.- Geneva : CERN, 2014-05-27 - 25 p. - Published in : Phys. Rev. D 89 (2014) 092009 APS Open Access article: PDF; Fulltext: PDF; External links: Previous draft version; Preprint
8.
Search for dark matter in events with a $Z$ boson and missing transverse momentum in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector / ATLAS Collaboration
A search is presented for production of dark matter particles recoiling against a leptonically decaying $Z$ boson in 20.3 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector at the Large Hadron Collider. Events with large missing transverse momentum and two oppositely-charged electrons or muons consistent with the decay of a $Z$ boson are analyzed. [...]
arXiv:1404.0051; CERN-PH-EP-2013-231; CERN-PH-EP-2013-231.- Geneva : CERN, 2014-07-10 - 21 p. - Published in : Phys. Rev. D 90 (2014) 012004 APS Open Access article: PDF; Fulltext: PDF; External links: Previous draft version; Preprint
9.
Search for top quark decays $t \rightarrow qH$ with $H \to \gamma\gamma$ using the ATLAS detector / ATLAS Collaboration
A search is performed for flavour-changing neutral currents in the decay of a top quark to an up-type ($c, u$) quark and a Higgs boson, where the Higgs boson decays to two photons. The proton-proton collision data set used corresponds to 4.7 fb$^{-1}$ at $\sqrt{s}$ = 7 TeV and 20.3 fb$^{-1}$ at $\sqrt{s}$ = 8 TeV collected by the ATLAS experiment at the LHC. [...]
arXiv:1403.6293; CERN-PH-EP-2014-036; CERN-PH-EP-2014-036.- Geneva : CERN, 2014 - 40 p. - Published in : JHEP 06 (2014) 008 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF; External links: Previous draft version; Preprint
10.
Measurement of the 4$\ell$ Cross Section at the $Z$ Resonance and Determination of the Branching Fraction of $Z\rightarrow 4\ell$ in $pp$ Collisions at $\sqrt{s}$ = 7 and 8 TeV with ATLAS / ATLAS Collaboration
Measurements of four-lepton (4$\ell$, $\ell=e,\mu$) production cross sections at the $Z$ resonance in $pp$ collisions at the LHC with the ATLAS detector are presented. For dilepton and four-lepton invariant mass region $m_{\ell^+\ell^-} > 5$ GeV and $80 < m_{4\ell} < 100$ GeV, the measured cross sections are $76 \pm 18 \text { (stat) } \pm 4 \text { (syst) } \pm 1.4 \text { (lumi) }$ fb and $107 \pm 9 \text{ (stat) } \pm 4 \text{ (syst) } \pm 3.0 \text { (lumi) }$ fb at $\sqrt s$ = 7 and 8 TeV, respectively. [...]
arXiv:1403.5657; CERN-PH-EP-2014-047; CERN-PH-EP-2014-047.- Geneva : CERN, 2014-06-13 - 18 p. - Published in : Phys. Rev. Lett. 112 (2014) 231806 APS Open Access article: PDF; Fulltext: PDF; External links: Previous draft version; Preprint

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