# Posters

2014-03-04
09:37
LHCb Forward Production of $W/Z$ Bosons in $pp$ Collisions
 Reference: Poster-2011-206 Keywords:  QCD Created: 2011. -1 p Creator(s): Bursche, A The unique acceptance coverage of the LHCb experiment allows the study of electroweak processes in the forward region which is sensitive to the parton density functions of the proton. This talk presents results on the production of $Z\rightarrow \mu\mu$ and $W\rightarrow \mu\nu$ and their ratios. The analysis is based on an integrated luminosity of $16.5 \pm 1.5$ pb$^{-1}$. The results are compared to NLO perturbative QCD calculations. Presented at 6th CERN-Latin American School of High-Energy Physics Natal, Brazil 23 Mar - 5 Apr 2011 CERN Geneva 2013 Latin American School of High Energy Physics 6 CERN-2013-003, (list conference papers) Related links:Conference: Swiss Physical Society - Joint Annual meeting 2011Used in © CERN Geneva Access to file

2013-12-16
10:50
LHCb: Characterisation and magnetic field properties of Multianode Photomultiplier tubes for the use in LHCb Upgrade RICH detectors
 Reference: Poster-2013-402 Note: On behalf of the LHCb RICH Collaboration Keywords:  LHCb  detector  RICH  upgrade Created: 2013. -1 p Creator(s): Eisenhardt, S; Luo, H; Morris, A; Needham, M; Neill, J A key feature of the LHCb upgrade, scheduled for 2019, is to remove the first level trigger and its data reduction from 40MHz to 1MHz, which is implemented in the on-detector readout electronics. The consequence for the LHCb Ring Imaging Cherenkov (RICH) detectors is that the Hybrid Photon Detectors need to be replaced as the readout chip is embedded in the tubes. Baseline for replacement are Multianode Photomultiplier tubes (MaPMT) and new readout electronics. Here we report about characterisation studies of the model Hamamatsu R11265 in the effort to qualify them for use in the LHCb RICH upgrade. Comparisons to the known model R7600 are also made. Two types of readout electronics are used. Most measurements to characterise the properties of the MaPMTs are taken with a VME based reference readout, using a x100 linear amplification and the CAEN V792 12-bit charge integrating digitiser. This allows to derive the signal properties from fits to the single photon spectra. In addition a prototype readout using the MAROC3 chip was used to read out the MaPMT directly, capable to provide fast binary signals at a speed of 40MHz. Using pulsed light (470nm, 15ns pulse width) the MaPMT were characterised for pixel-to-pixel and tube-to-tube gain variations, for the signal loss below threshold, for cross-talk between pixels, for the gain dependency on high voltage and for their effective pixel size. A subset of these measurements was repeated with the MaPMT been subjected to a controlled magnetic field, applied sequentially to all three space axes. Using signle photon spectra additional signal loss due to photoelectrons missing the entry window and charge getting lost in the multiplication process can be disentangled. Results from these studies will be presented and discussed. Presented at 8th International Workshop on Ring Imaging Cherenkov Detectors (RICH 2013) Hayama, Kanagawa, Japan 2 - 6 Dec 2013 2013 , (list conference papers) © CERN Geneva Access to files

2013-11-01
17:29
ALICE Zero Degree Calorimeter
 Reference: Poster-2013-401 Keywords:  ALICE  ZDC  Zero Degree Calorimeter Created: 2013. -1 p Creator(s): De Marco, N; Puddu, G Two identical sets of calorimeters are located on both sides with respect to the beam Interaction Point (IP), 112.5 m away from it. Each set of detectors consists of a neutron (ZN) and a proton (ZP) Zero Degree Calorimeter (ZDC), positioned on remotely controlled platforms. The ZN is placed at zero degree with respect to the LHC beam axis, between the two beam pipes, while the ZP is positioned externally to the outgoing beam pipe. The spectator protons are separated from the ion beams by means of the dipole magnet D1. Related links:Outreach material © CERN Geneva Access to file

2013-11-01
17:23
ALICE Vzero Detector
 Reference: Poster-2013-400 Keywords:  ALICE  V0  Vzero Created: 2013. -1 p Creator(s): Cheynis, B ALICE is the only experiment at CERN specifically designed to study the Quark-Gluon Plasma, the hot and dense matter which is created in ultra relativistic heavy-ion collisions. - VZERO-A (UNAM Mexico): 2.8 < η < 5.1 -> 328 cm away from Interaction Point - VZERO-C (IPN Lyon): -3.6 < η < -1.7 -> 88 cm away from Interaction Point Related links:Outreach material © CERN Geneva Access to files

2013-11-01
16:05
CORAL and COOL during the LHC long shutdown
 Reference: Poster-2013-399 Created: 2013. -1 p Creator(s): Valassi, A; Clemencic, M; Dykstra, D; Goyal, N; Salnikov, A [...] CORAL and COOL are two software packages used by the LHC experiments for managing detector conditions and other types of data using relational database technologies. They have been developed and maintained within the LCG Persistency Framework, a common project of the CERN IT department with ATLAS, CMS and LHCb. This presentation reports on the status of CORAL and COOL at the time of CHEP2013, covering the new features and enhancements in both packages, as well as the changes and improvements in the software process infrastructure. It also reviews the usage of the software in the experiments and the outlook for ongoing and future activities during the LHC long shutdown (LS1) and beyond. Presented at 20th International Conference on Computing in High Energy and Nuclear Physics 2013 Amsterdam, Netherlands 14 - 18 Oct 2013 2013 , (list conference papers) © CERN Geneva Access to file

2013-11-01
10:58
 Reference: Poster-2013-398 Keywords:  ALICE  TRD  Transition Radiation Detector Created: 2013. -1 p Creator(s): Pachmayer, Y The Transition Radiation Detector (TRD) is the main electron detector in ALICE. In conduction with the TPC and the ITS, it provides the necessary electron identification capability to study: - Production of light and heavy vector mesons as well as the continuum in the di-electron channel, - Semi leptonic decays of hadrons with open charm and open beauty via the single-electron channel using the displaced vertex information provided by the ITS, - Correlated DD and BB pairs via coincidences of electrons in the central barrel and muons in the forward muon arm, - Jets with high Pτ tracks in one single TRD stack. Related links:Outreach material © CERN Geneva Access to files

2013-11-01
10:35
ALICE Time Projection Chamber
 Reference: Poster-2013-397 Keywords:  ALICE  TPC  Time Projection Chamber Created: 2013. -1 p Creator(s): Lippmann, C; Garabatos Cuadrado, J The Time Projection Chamber (TPC) is the main device in the ALICE 'central barrel' for the tracking and identification (PID) of charged particles. It has to cope with unprecedented densities of charges particles. Related links:Outreach material © CERN Geneva Access to file

2013-11-01
09:24
ALICE Time Of Flight Detector
 Reference: Poster-2013-396 Keywords:  ALICE  TOF  Time Of Flight Created: 2013. -1 p Creator(s): Alici, A; Hatzifotiadou, D Charged particles in the intermediate momentum range are identified in ALICE by the Time Of Flight (TOF) detector. The time measurement with the TOF, in conjunction with the momentum and track length measured by the tracking detector, is used to calculate the particle mass. Related links:Outreach material © CERN Geneva Access to file

2013-11-01
09:17
ALICE Photon Spectrometer
 Reference: Poster-2013-395 Keywords:  ALICE  PHOS  Photon Spectrometer Created: 2013. -1 p Creator(s): Kharlov, Y; Manko, V PHOS provides unique coverage of the following physics topics: - Study initial phase of the collision of heavy nuclei via direct photons, - Jet-quenching as a probe of deconfinement, studied via high Pτ ϒ and π0, - Signals of chiral-symmetry restoration, - QCD studies in pp collisions via identified neutral spectra. Related links:Outreach material © CERN Geneva Access to file

2013-11-01
08:57
ALICE Photon Multiplicity Detector
 Reference: Poster-2013-394 Keywords:  ALICE  PMD  Photon Multiplicity Detector Created: 2013. -1 p Creator(s): Nayak, T Photon Multiplicity Detector (PMD) measures the multiplicity and spatial distribution of photons in the forward region of ALICE on a event-by-event basis. PMD is a pre-shower detector having fine granularity and full azimuthal coverage in the pseudo-rapidity region 2.3 < η < 3.9. Related links:Outreach material © CERN Geneva Access to file