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2014-11-21
15:40
First evidence for the rare decay $B^0_S\rightarrow\mu^+\mu^-$
 Reference: Poster-2014-458 Created: 2014. -1 p Creator(s): Tolk, Siim; Blake, Thomas LHCb observed evidence for a very rare decay of a neutral $B_S$ meson into a pair of muons[1]. The probability that the background could produce such an excess or larger is mere 5.3 x $10^{-4}$. This corresponds to signal significance of 3.5 standard deviations in the combined 1.0fb$^{-1}$ of 2011 (√s=7TeV) and 1.11f$^{-1}$ of 2012 (√s=8TeV) data. Related links:Conference LHCP 2014 © CERN Geneva Access to files

2014-11-21
15:24
LHCb Observation of photon polarization in the $b\rightarrow s\gamma$ transition
 Reference: Poster-2014-457 Created: 2014. -1 p Creator(s): Veneziano, Giovanni; Blake, Thomas The Standard Model (SM) predicts that the photon emitted in $b\rightarrow s\gamma$ transitions is predominantly left-handed. While the measured inclusive $b\rightarrow s\gamma$ rate agrees with the SM calculations, no direct evidence exists for a nonzero photon polarization $\lambda_\gamma$ in this type of decays. Several extensions of the SM, compatible with all current measurements, predict that the photon acquires a significant right-handed component. Related links:Conference LHCP 2014 © CERN Geneva Access to file

2014-11-20
14:48
A Feasibility Experiment of a W-powder Target
 Reference: Poster-2014-456 Created: 2014. -1 p Creator(s): Charitonidis, N; Efthymiopoulos, I; Carreta, O; Densham, C; Davenne, T [...] The development of high‐power targets remains a key R&D activity for future facilities presently under study like the Neutrino Factory, Muon Collider or upgraded high‐ power super beams for long‐baseline neutrino experiments.  The choice of materials to sustain the beam power ranging up to MW levels is not trivial. Granular solid targets have been proposed and are being studied as a candidate for such high‐power target systems. In the recently commissioned HiRadMat facility at CERN, a feasibility  experiment of a tungsten powder target was performed. The experiment was designed to explore for ﬁrst time the impact of a high‐power proton beam on a static W-powder target in a thimble conﬁguration. The diagnostics of the experiment were based on remote high speed photography as well as on laser‐doppler vibration measurements of the target containers. Results from the experimental ﬁndings are presented in this poster. © CERN Geneva Access to files

2014-11-20
14:01
HiRadMat at CERN/SPS - A dedicated facility providing high intensity beam pulses to material samples

2014-11-18
10:06
Quarkonia production in p-Pb collisions at LHCb
 Reference: Poster-2014-454 Created: 2014. -1 p Creator(s): Li, Yiming The production of $J/ψ$ and $Υ(1 S)$ mesons decaying into dimuon final state is studied at the LHCb experiment, with rapidity 1.5 < y < 4.0 or − 5.0 < y < − 2.5 in proton-lead collisions at a nucleon-nucleon centre-of-mass energy $\sqrt{s_{NN}}$ = 5 TeV, based on a data sample corresponding to an integrated luminosity of 1.6 nb −1. The nuclear modification factor and forward-backward production ratio are determined for prompt $J/ψ$, $J/ψ$ from b-hadron decay and $Υ(1 S)$ mesons in study of the cold nuclear matter effects. Related links:Conference LHCP 2014 © CERN Geneva Access to files

2014-11-14
21:22
Scintillating Fibre Tracker Front-End Electronics for LHCb upgrade

2014-11-10
10:51
ALICE RunControl Center poster (Vertical)
 Reference: Poster-2014-452 Keywords:  ALICE  ARC  ALICE RunControl Center  Point 2 Created: 2014. -1 p Creator(s): Ronchetti, F Follow the ALICE RunControl Center Related links:ALICE RunControl Center © CERN Geneva Access to file

2014-11-10
10:30
ALICE RunControl Center Poster (Horizontal)
 Reference: Poster-2014-451 Keywords:  ALICE  ARC  ALICE RunControl Center  Point 2 Created: 2014. -1 p Creator(s): Ronchetti, F Follow the ALICE RunControl Center Related links:ALICE RunControl Center © CERN Geneva Access to file

2014-10-21
11:04
LS1 “First Long Shutdown of LHC and its Injector Chains”
 Reference: CERN-ACC-POSTER-2014-0001 Created: 2014. -1 p Creator(s): Foraz, K; Baird, S; Barberan, M; Bernardini, M; Coupard, J [...] The LHC and its Injectors were stopped in February 2013, in order to maintain, consolidate and upgrade the different equipment of the accelerator chain, with the goal of achieving LHC operation at the design energy of 14 TeV in the centre-of-mass. Prior to the start of this First Long Shutdown (LS1), a major effort of preparation was performed in order to optimize the schedule and the use of resources across the different machines, with the aim of resuming LHC physics in early 2015. The rest of the CERN complex will restart beam operation in the second half of 2014. This paper presents the schedule of the LS1, describes the organizational set-up for the coordination of the works, the main activities, the different main milestones, which have been achieved so far, and the decisions taken in order to mitigate the issues encountered. Presented at 5th International Particle Accelerator Conference Dresden, Germany 15 - 20 Jun 2014 JACoW Geneva 2014 , (list conference papers) Related links:Used in FulltextFulltext

2014-10-08
16:16
Secluded Dark Matter search in the Sun with the ANTARES neutrino telescope
 Reference: Poster-2014-450 Keywords:  Dark Matter  Secluded Dark Matter  Analysis Created: 2014. -1 p Creator(s): Adrián-Martínez, S; on behalf of the, ANTARES Collaboration Models where Dark Matter (DM) is secluded from the Standard Model via a mediator have increased their presence during the last decade to explain some experimental observations. This is a special scenario where DM, which would gravitationally accumulate in sources like the Sun, the Earth or the Galactic Centre, is annihilated into a non-standard Model mediator which subsequently decays into Standard Model particles, two co-linear muons for example. As the lifetime of the mediator could be large enough, its decay may occur in the vicinity of the Earth and the resulting SM particles could be detected. In this work we will describe the analysis for secluded dark matter coming from the Sun with ANTARES in three different cases: a) detection of di-muons that result of the mediator decay, or neutrino detection from: b) mediator that decays into di-muon and, in turn, into neutrinos, and c) mediator that directly decays into neutrinos. Sensitivities and results of the analysis for each case will be presented. © CERN Geneva Access to files

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