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2014-08-29
16:15
Study of ZZ to four leptons events in ATLAS at the LHC and upgrade of the ATLAS Muon Spectrometer
Reference: Poster-2014-448
Keywords:  ZZ  TGC  ATLAS  Muon  Spectrometer  upgrade  LHC
Created: 2014. -1 p
Creator(s): Kouskoura, V

The study of the ZZ and ZZ* production in proton-proton collisions at the Large Hadron Collider (LHC) at CERN is presented. The data analyzed in this study were recorded by the ATLAS experiment at a centre-of-mass energy of 7 TeV and of 8 TeV. The selected events are consistent with fully leptonic ZZ decays, in particular to electrons and muons. The total ZZ production cross section is measured and is found to be in agreement with the Standard Model (SM) prediction. The ZZ production allows the study of the anomalous neutral Triple Gauge Couplings. No deviation from the SM prediction is found that could indicate the presence of New Physics. In view of the forthcoming increase of the instantaneous luminosity of the LHC, the ATLAS Collaboration foresees upgrades of the detector. An upgrade of the Muon Spectrometer is presented. The integration of the new detection elements in the ATLAS Geometry is illustrated, as well as the increase in the total Barrel acceptance.

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CERN Doctoral Student Poster Session 2014
© CERN Geneva

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2014-08-25
14:47
The Development of a General Purpose ARM-based Processing Unit for the TileCal sROD
Reference: Poster-2014-447
Keywords:  High data throughput  sROD  Tile Calorimeter  Pile-up
Created: 2014. -1 p
Creator(s): Cox, Mitchell A

The Large Hadron Collider at CERN generates enormous amounts of raw data which present a serious computing challenge. After planned upgrades in 2022, the data output from the ATLAS Tile Calorimeter will increase by 200 times to 41 Tb/s! ARM processors are common in mobile devices due to their low cost, low energy consumption and high performance. It is proposed that a cost-effective, high data throughput Processing Unit (PU) can be developed by using several consumer ARM processors in a cluster configuration to allow aggregated processing performance and data throughput while maintaining minimal software design difficulty for the end-user. This PU could be used for a variety of high-level functions on the high-throughput raw data such as spectral analysis and histograms to detect possible issues in the detector at a low level. High-throughput I/O interfaces are not typical in consumer ARM System on Chips but high data throughput capabilities are feasible via the novel use of PCI-Express as the I/O interface to the ARM processors. An overview of the PU is given and the results for performance and throughput testing of Freescale i.MX6 quad-core ARM Cortex-A9 processors are presented.

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Affiliation web site
© CERN Geneva

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2014-08-18
15:38
LHCb Search for new physics in the $b \rightarrow c\bar{c}s$ decays with LHCb detector at LHC
Reference: Poster-2014-446
Keywords:  LHCb
Created: 2014. -1 p
Creator(s): Martin, Morgan

LHCb Search for new physics in the $b \rightarrow c\bar{c}s$ decays with LHCb detector at LHC

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CERN Summer Student poster session
© CERN Geneva

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2014-07-31
14:03
LHCb Upstream Tracker
Reference: Poster-2014-445
Keywords:  lhcb  upstream tracker
Created: 2014. -1 p
Creator(s): Gandini, Paolo

The LHCb upgrade requires replacing the silicon strip tracker between the vertex locator (VELO) and the magnet. A new design has been developed and tested based on the "stave" concept planned for the ATLAS upgrade.

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Conference LHCb Poster
© CERN Geneva

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2014-07-16
11:49
LHCb Upstream Tracker
Reference: Poster-2014-444
Keywords:  LHCb
Created: 2014. -1 p
Creator(s): Gandini, P

The LHCb upgrade requires replacing the silicon strip tracker between the vertex locator (VELO) and the magnet. A new design has been developed and tested based on the "stave" concept planned for the ATLAS upgrade

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50 Years of CP Violation
© CERN Geneva

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2014-07-16
11:39
LHCb Measurement of the CKM angle $\gamma$ at LHCb
Reference: Poster-2014-443
Keywords:  LHCb
Created: 2014. -1 p
Creator(s): Ali, S

In this poster we present the latest result by the LHCb collaboration in determining the CKM angle $\gamma$ ($(67.1 \pm 12)^{\circ}$). The result is determined by combining several $B \to Dh$ analyses. Latest results from the decay time dependent $B_{s} \to D_{s}K$ analysis is also reported, along with a few other decay channels interesting for determination of $\gamma$ in the future.

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50 Years of CP Violation
© CERN Geneva

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2014-07-15
10:52
LHCb : Measuring $CP$ violation with $\Delta A_{CP}$ at LHCb
Reference: Poster-2014-442
Keywords:  LHCb
Created: 2014. -1 p
Creator(s): Pearce, A

Measurements are presented of direct $CP$ violation in $D^{0}$ meson decays in LHCb, using the $\Delta A_{CP}$ technique, and a proposal is outlined to make similar measurements in the decays of the charmed baryon $\Lambda_{c}^{+}$. The motivations for use of the $\Delta A_{CP}$ method are discussed, along with the current results and future prospects.

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50 Years of CP Violation
© CERN Geneva

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2014-07-14
17:12
LHCb : Search for Lepton Flavour Violation at LHCb
Reference: Poster-2014-441
Keywords:  LHCb
Created: 2014. -1 p
Creator(s): Rives Molina, Vicente

The observation of neutrino oscillations has re-opened the case for searches of lepton-flavour violating decays. We report on recent results on searches for short or long-lived Majorana heavy neutrinos in B&arr;μμπ and τ→μμμ decays

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ICHEP2014
© CERN Geneva

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2014-07-11
18:04
LHCB Searches for long-lived heavy particles at LHCb
Reference: Poster-2014-440
Keywords:  LHCb
Created: 2014. -1 p
Creator(s): Marin Benito, Carla

Its forward acceptance and good resolution allow LHCb to perform competitive searches for heavy particles beyond the Standard Model. We report a search for the stau particle with the LHCb detector and give our prospects for searches of Hidden Valley particles.

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ICHEP2014 Conference
© CERN Geneva

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2014-06-24
15:27
LHCb: Dynamically Adaptive Header Generator and Front-End Source Emulator for a 100 Gbps FPGA Based DAQ
Reference: Poster-2014-439
Keywords:  online  DAQ
Created: 2014. -1 p
Creator(s): Srikanth, S

The proposed upgrade for the LHCb experiment envisages a system of 500 Data sources each generating data at 100 Gbps, the acquisition and processing of which is a big challenge even for the current state of the art FPGAs. This requires an FPGA DAQ module that not only handles the data generated by the experiment but also is versatile enough to dynamically adapt to potential inadequacies of other components like the network and PCs. Such a module needs to maintain real time operation while at the same time maintaining system stability and overall data integrity. This also creates a need for a Front-end source Emulator capable of generating the various data patterns, that acts as a testbed to validate the functionality and performance of the Header Generator. The rest of the abstract briefly describes these modules and their implementation. The Header Generator is used to packetize the streaming data from the detectors before it is sent to the PCs for further processing. This is achieved by continuously scanning the input stream for payload length information, extracting the same and then assembling the header. Since the payloads(events) are of varying lengths, the starting position of each new payload is calculated in real time based on the length information of the preceding payload. After a fixed number of the payloads have passed and their length information extracted and added to the header template, additional information like the total number of events in the packet, size of the largest payload, and also the combined length of the sum of all payloads and the header itself are calculated and added to the header template. This process completes the generation of a single Header. Signals are asserted to indicate that the header is ready to be read out and sent to the PC. Two sets of memories were created so that the assembling of the next header can begin while the calculation of the additional information for the previous header are still under way. A mechanism to dynamically invalidate individual events were added to deal with downstream bottlenecks that could result in buffer overflows compromising data integrity. This drops much of the individual payloads in a controlled manner, marking the corresponding header field as invalid, effectively reducing the data rate to a trickle on the fly, while maintaining system stability and overall data integrity. The Source Emulator serves the dual purpose of being a test bench to the Header Generator as well as being an stand alone module that can be used in any other system where the detector data needs to emulated. The variability of the detector data is modeled by using a pseudo-random number generator to create payloads of varying lengths. With this Source Emulator as the test bench the Header Generator was functionally validated both for general scenarios as well as for identified corner cases. We present simulation results and performance measures from implementation on a Altera Stratix IV platform.

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Conference: 19th Real Time Conference
© CERN Geneva

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