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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.

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Conference LHCP 2014
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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.

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Conference LHCP 2014
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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.  

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2014-11-20
14:01
HiRadMat at CERN/SPS - A dedicated facility providing high intensity beam pulses to material samples
Reference: Poster-2014-455
Created: 2014. -1 p
Creator(s): Charitonidis, N; Fabich, A; Efthymiopoulos, I

HiRadMat (High Radiation to Materials), constructed in 2011, is a facility at CERN designed to provide high‐intensity pulsed beams to an irradiation area where material samples as well as accelerator component assemblies (e.g. vacuum windows, high power beam targets, collimators…) can be tested. The facility uses a 440 GeV proton beam extracted from the CERN SPS with a pulse length of up to 7.2 us, and with a maximum pulse energy of 3.4 MJ (3xE13 proton/pulse). In addition to protons, ion beams with energy of 440 GeV/charge and total pulse energy of 21 kJ can be provided. The beam parameters can be tuned to match the needs of each experiment. HiRadMat is not an irradiation facility where large doses on equipment can be accumulated. It is rather a test area designed to perform single pulse experiments to evaluate the effect of high‐intensity pulsed beams on materials or accelerator component assemblies in a controlled environment. The fa‐ cility is designed for a maximum of 1E16 protons per year, distributed among 10 experiments, each having a total of 1E15 protons or about 100 high intensity pulses. This poster will also demonstrate the possibilities for research using this facility and showing examples of upcoming experiments scheduled for the coming beam period starting in autumn 2014. Beam operation to HiRadMat will resume in autumn 2014, initially with proton beam availability, while in early 2015 Argon ions will also be available.

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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.

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Conference LHCP 2014
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2014-11-14
21:22
Scintillating Fibre Tracker Front-End Electronics for LHCb upgrade
Reference: Poster-2014-453
Created: 2014. -1 p
Creator(s): Comerma, A

The LHCb detector will be upgraded during the next LHC shutdown in 2018/19. The tracker system will undergo major changes. Its components will be replaced by new technologies in order to cope with the increased hit occupancy and the higher radiation dose. A detector made of scintillating fibres read out by silicon photomultipliers (SiPM) is envisaged for this upgrade. Even if this technology has proven to achieve high efficiency and spatial resolution, its integration within a LHC experiment bears new challenges. The detector will consist of 12 planes of 5 to 6 layers of 250μm fibres stacked covering a total area of 5x6m^2 . The desired spacial resolution on the reconstructed hit is 100μm. SiPMs have been adapted to the detector geometry reducing the dead area between channels. A total of 64 channels are arranged in a single die with common cathode connection and channel size of 0.23x1.32mm^2 . Two dies are packaged together with only 0.25mm of dead area between them. Radiation tolerance of such devices is an important challenge. Operation at low temperatures will be crucial to achieve the desired performance. Several manufacturers have produced prototypes for testing with different characteristics but same form factor. This size leads to a total of over 500k channels which need to be read out at 40MHz. The PACIFIC ASIC will readout of SiPMs with no interface components between devices and ASIC. It will handle 64 channels with analog signal processing and digitization. Current prototype comprises 8 channels. The first stage is a current conveyor followed by a fast shaper (≈10ns to cope with signal arrival times) and a gated integrator. The digitization is done using a 2 bits non-linear flash ADC operating at 40MHz. The power consumption has been kept bellow 8mW per channel.

Presented at Conference Information and Promotion Committee (CIP) for the IEEE – Nuclear Science Symposium and Medical Imaging Conference, and Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors workshop (IEEE NSS-MIC) Seattle, WA, USA 8 - 15 Nov 2014 2014 , (list conference papers) Related links:
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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

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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

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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:
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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.

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