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2015-03-05
17:29
LHCb's Real-Time Alignment in Run2
Reference: Poster-2015-472
Keywords:  LHCb
Created: 2015. -1 p
Creator(s): Batozskaya, Varvara

Stable, precise spatial alignment and PID calibration are necessary to achieve optimal detector performances. During Run2, LHCb will have a new real-time detector alignment and calibration to reach equivalent performances in the online and offline reconstruction. This offers the opportunity to optimise the event selection by applying stronger constraints as well as hadronic particle identification at the trigger level. The required computing time constraints are met thanks to a new dedicated framework using the multi-core farm infrastructure for the trigger.

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2015-03-05
17:22
Search for $CP$ violation in $D^0\rightarrow \pi^-\pi^+\pi^0$ decays with the energy test
Reference: Poster-2015-471
Keywords:  LHCb
Created: 2015. -1 p
Creator(s): Chen, Shanzhen

The LHCb experiment has recorded the world's largest sample of charmed meson decays. This contribution presents a study of a $D^0$ meson decaying into a final state containing a neutral pion in LHCb. The search for $CP$ violation exploits a novel model-independent unbinned technique to assign a $p$-value for the no $CP$ violation hypothesis. With a data sample size exceeding that of previous measurements by almost an order of magnitude the world's best sensitivity is obtained. The $p$-value of no $CP$ violation hypothesis given data of $D^0\rightarrow \pi^-\pi^+\pi^0$ decay analysed is found to be $(2.6 \pm 0.5)\times 10^{-2}$.

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2015-03-05
17:14
CKM angle $\gamma$ from LHCb
Reference: Poster-2015-470
Keywords:  LHCb
Created: 2015. -1 p
Creator(s): Smith, Jackson

Results of the latest $\gamma$ combination from LHCb are presented, along with the six LHCb measurements used as inputs. In addition, the anticipated precision attainable for measuring $\gamma$ after the LHCb Upgrade is outlined

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2015-03-05
17:06
Production asymmetries of neutral B mesons in pp collisions at LHCb
Reference: Poster-2015-469
Keywords:  LHCb
Created: 2015. -1 p
Creator(s): Ferrari, Fabio

The B0bar-B0 and Bsbar-Bs production asymmetries, AP(B0) and AP(Bs), are measured by means of a time-dependent analysis of B0 -> J/\psi K*0, B0 -> D- pi+ and Bs -> Ds- pi+ decays, using a data sample corresponding to an integrated luminosity of 1.0 fb^{-1}, collected by LHCb in pp collisions at a centre-of-mass energy of 7 TeV. The measurements are performed as a function of transverse momentum and pseudorapidity of the B0 and Bs mesons within the LHCb acceptance. The production asymmetries, integrated over pT and eta in the range 4 < pT< 30 GeV/c and 2.5<eta<4.5, are determined to be AP(B0) = (-0.35 +/- 0.76 +/- 0.28)% and AP(Bs) = (1.09 +/- 2.61 +/- 0.66)%, where the first uncertainties are statistical and the second systematic

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2015-03-05
16:54
Angular analysis of the $B^0 \to K^{*0} e^+ e^-$ decay in the low-$q^2$ region at LHCb
Reference: Poster-2015-468
Keywords:  LHCb
Created: 2015. -1 p
Creator(s): Borsato, Martino

An angular analysis of the $B^0 \rightarrow K^{*0} e^+ e^-$ decay is performed using a data sample, corresponding to an integrated luminosity of 3.0${\mbox {fb}^{-1}}$, collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared ($q^2$) interval between 0.002 and 1.120${\mathrm{\,Ge\kern -0.1em V^2\!/}c^4}$. The angular observables $F_{\mathrm{L}}$ and $A_{\mathrm{T}}^{\mathrm{Re}}$ which are related to the \Kstarz polarisation and to the lepton forward-backward asymmetry, are measured to be $F_{\mathrm{L}}= 0.16 \pm 0.06 \pm0.03$ and $A_{\mathrm{T}}^{\mathrm{Re}} = 0.10 \pm 0.18 \pm 0.05$, where the first uncertainty is statistical and the second systematic. The angular observables $A_{\mathrm{T}}^{(2)}$ and $A_{\mathrm{T}}^{\mathrm{Im}}$ which are sensitive to the photon polarisation in this $q^2$ range, are found to be $A_{\mathrm{T}}^{(2)} = -0.23 \pm 0.23 \pm 0.05$ and $A_{\mathrm{T}}^{\mathrm{Im}} =0.14 \pm 0.22 \pm 0.05$. The results are consistent with Standard Model predictions.

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LHCC conference poster
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2015-02-12
13:19
Indico
Reference: Poster-2015-466
Created: 2012. -1 p
Creator(s): Ferreira, Pedro

Indico was born as a European project. In 2004, CERN became the sole owner of the project and decided to further extend its capabilities, enabling CERN users to manage lectures and meetings as well. This allowed Indico to replace the 'CERN Agenda' application. In 2007, a Room Booking module was added, thus allowing CERN users to book their rooms on-line. Indico became, in 2009, CERN's hub for collaborative tools, empowering collaborations such as the LHC and its experiments with video conferencing and chatting capabilities. Since then, several other features have been developed, such as a full-fledged paper reviewing module for conferences and a powerful HTTP API.

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2015-02-11
16:02
The keys to CERN conference rooms - Managing local collaboration facilities in large organisations
Reference: Poster-2015-465
Created: 2013. -1 p
Creator(s): Baron, T; Domaracky, M; Duran, G; Correia Fernandes, J; Ferreira, P [...]

For a long time HEP has been ahead of the curve in its usage of remote collaboration tools, like videoconference and webcast, while the local CERN collaboration facilities were somewhat behind the expected quality standards for various reasons. This time is now over with the creation by the CERN IT department in 2012 of an integrated conference room service which provides guidance and installation services for new rooms (either equipped for video-conference or not), as well as maintenance and local support. Managing now nearly half of the 250 meeting rooms available on the CERN sites, this service has been built to cope with the management of all CERN rooms with limited human resources. This has been made possible by the intensive use of professional software to manage and monitor all the room equipment, maintenance and activity. This paper will focus on presenting these packages, either off-the-shelf commercial products (asset and maintenance management tool, remote audiovisual equipment monitoring systems, local automation devices, new generation touch screen interfaces for interacting with the room) when available or locally developed integration and operational layers (generic audiovisual control and monitoring framework) and how they help overcoming the challenges presented by such a service. The aim is to minimise local human interventions while preserving the highest service quality and placing the end user back to the center of this collaboration platform.

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2015-01-28
17:01
Multimedia and Document Services
Reference: Poster-2015-464
Keywords:  CERN Document Server  CDS  Invenio  Digital Library  Multimedia  Institutional Repository
Created: 2013. -1 p
Creator(s): Marian, Ludmila; Caffaro, Jérôme; Le Meur, Jean-Yves

Enabling access to articles, reports and multimedia content produced by CERN, using the Invenio digital library and repository software.

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2015-01-05
15:32
Benchmarking Microwave Cavity Dark Matter Searches using a Radioactive Source
Reference: Poster-2015-463
Created: 2014. -1 p
Creator(s): Caspers, F; Betz, M

A radioactive source is proposed as a calibration device to verify the sensitivity of a microwave dark matter search experiment. The interaction of e.g., electrons travelling in an arbitrary direction and velocity through an electromagnetically “empty” microwave cavity can be calculated numerically. We give an estimation of the energy deposited by a charged particle into a particular mode. Numerical examples are given for beta emitters and two particular cases: interaction with a field free cavity and interaction with a cavity which already contains an electromagnetic field. Each particle delivers a certain amount of energy related to the modal R/Q value of the cavity. The transferred energy is a function of the particles trajectory and its velocity. It results in a resonant response of the cavity, which can be observed using a sensitive microwave receiver, provided that the deposited energy is significantly above the single photon threshold.

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2014-11-27
09:35
LHCb : A generic firmware core to drive the Front-End GBT-SCAs for the LHCb ugprade
Reference: Poster-2014-462
Keywords:  LHCb  LHC  Upgrade  trigger-less electronics  GBT  GBT-SCA  TFC  ECS
Created: 2014. -1 p
Creator(s): Alessio, Federico; Caplan, Cairo; Gaspar, Clara; Jacobsson, Richard; Wyllie, Ken

The LHCb experiment has proposed an upgrade towards a full 40 MHz readout system in order to run between five and ten times its initial design luminosity. The entire Front-End electronics will be upgraded in order to cope with higher sub-detector occupancy, higher data rate and to work in a complete trigger-less fashion. In this paper, we describe a novel way to transmit slow control information to the Front-End electronics, by profiting from bidirectional optical connections and the GBT and GBT-SCA chipset capabilities. The implementation and preliminary validation tests are shown as well

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Hinweis auf:
Open Days 2013 Posters (58)