# CERN Preprints

2013-05-17
11:55
 Study of $B^{0} \rightarrow D^{*-}\pi^{+}\pi^{-}\pi^{+}$ and $B^{0} \rightarrow D^{*-}K^{+}\pi^{-}\pi^{+}$ decays Using proton-proton collision data collected by the LHCb experiment at $\sqrt{s} =$ 7 TeV, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, the ratio of branching fractions of the $B^{0}\rightarrow D^{*-}\pi^{+}\pi^{-}\pi^{+}$ decay relative to the $B^{0} \rightarrow D^{*-}\pi^{+}$ decay is measured to be \begin{equation*} \frac{\mathcal{B}(B^{0}\rightarrow D^{*-}\pi^{+}\pi^{-}\pi^{+})}{\mathcal{B}(B^{0} \rightarrow D^{*-}\pi^{+})} = 2.64 \pm 0.04\,(\text{stat.}) \pm 0.13\,(\text{syst.})\, . [...] CERN-PH-EP-2013-041 ; LHCB-PAPER-2012-046. - 2013. Fulltext - Previous draft version - Related data file(s)

2013-05-17
11:04
 Les hodoscopes du spectrometre M2 / Brahy, J ; Rossa, E SPS-EBP-Note-77-5. - 1977. - 16 p. Fulltext

2013-05-17
09:50
 Measurement of the distributions of event-by-event flow harmonics in lead-lead collisions at sqrt(sNN) = 2.76 TeV with the ATLAS detector The distributions of event-by-event harmonic flow coefficients vn for n=2–4 are measured in sqrt(sNN) = 2.76 TeV Pb+Pb collisions using the ATLAS detector at the LHC. [...] CERN-PH-EP-2013-044. - 2013. Fulltext - Previous draft version

2013-05-17
04:13
 Further exploration of top pair hadroproduction at NNLO / Czakon, Michal ; Fiedler, Paul ; Mitov, Alexander ; Rojo, Juan Top quark pair production is one of the cornerstones of the physics program at hadron colliders. [...] arXiv:1305.3892 ; CERN-PH-TH-2013-100 ; TTK-13-15. - 2013. - 8 p. Preprint - Full text

2013-05-16
16:54
 Testing Results for Nb-Ti, 120-mm-Aperture, Low-B Quadrupole Models for the LHC High-Luminosity Insertion / Kirby, G A ; Auchmann, B ; Bajko, M ; Charrondiere, M ; Bourcey, N ; Datskov, V I ; Fessia, P ; Feuvrier, J ; Galbraith, P ; Garcia Tabares, A et al. The design and construction of a 120 mm wide-aperture, Nb-Ti superconducting quadrupole magnet for the LHC insertion region is part of a study towards a luminosity upgrade of the LHC at CERN, envisaged for 2020-22. [...] CERN-ATS-2013-041. - 2013. - 6 p.

2013-05-16
04:12
 The Utility of Naturalness, and how its Application to Quantum Electrodynamics envisages the Standard Model and Higgs Boson / Wells, James D (CERN ; Michigan U.) With the Higgs boson discovery and no new physics found at the LHC, confidence in Naturalness as a guiding principle for particle physics is under increased pressure. [...] arXiv:1305.3434 ; CERN-PH-TH-2013-102. - 2013. - 7 p. Preprint - Full text

2013-05-15
04:06
 Optimal polarisation equations in FLRW universes / Tram, Thomas (IPT, Lausanne) ; Lesgourgues, Julien (IPT, Lausanne ; CERN ; Annecy, LAPTH) This paper presents the linearised Boltzmann equation for photons for scalar, vector and tensor perturbations in flat, open and closed FLRW cosmologies. [...] arXiv:1305.3261 ; CERN-PH-TH-2013-099 ; LAPTH-025-13. - 2013. - 27 p. Preprint - Full text

2013-05-14
13:32
 D meson elliptic flow in non-central Pb-Pb collisions at sqrts(s_NN) = 2.76TeV / , Azimuthally anisotropic distributions of D0, D+ and D*+ mesons were studied in the central rapidity region (|y|<0.8) in Pb-Pb collisions at a centre-of-mass energy sqrts(s_NN) = 2.76TeV per nucleon-nucleon collision, with the ALICE detector at the LHC. [...] arXiv:1305.2707 ; CERN-PH-EP-2013-085. - 2013. Preprint

2013-05-14
13:31
 A search for $t\bar{t}$ resonances in the lepton plus jets final state with ATLAS using 4.7 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 7 TeV / ATLAS Collaboration A search for new particles that decay into top quark pairs ($t\bar{t}$) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7 fb$^{-1}$ of proton-proton (pp) collision data collected at a center-of-mass energy $\sqrt{s}$=7 TeV. [...] arXiv:1305.2756 ; CERN-PH-EP-2013-032. - 2013. - 29 p. Fulltext - Previous draft version - Preprint

2013-05-14
13:21
 Triggers for displaced decays of long-lived neutral particles in the ATLAS detector / ATLAS Collaboration A set of three dedicated triggers designed to detect long-lived neutral particles decaying throughout the ATLAS detector to a pair of hadronic jets is described. [...] arXiv:1305.2284 ; CERN-PH-EP-2013-047. - 2013. - 40 p. Fulltext - Previous draft version - Preprint