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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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2014-06-16
12:08
LHCb: Searches for $\Lambda^0_b$ and $\Xi^0_b$ decays to $K^0_{\mathrm{S}}p\pi^-$ and $K^0_{\mathrm{S}}pK^-$ final states with first observation of the $\Lambda^0_b \rightarrow K^0_{\mathrm{S}}p\pi^-$ decay
Reference: Poster-2014-438
Keywords:  flavour physics
Created: 2014. -1 p
Creator(s): Whitehead, M

A search for previously unobserved decays of beauty baryons to the final states $K^0_{\mathrm{S}}p\pi^-$ and $K^0_{\mathrm{S}}pK^-$ is reported. The analysis is based on a data sample corresponding to an integrated luminosity of $1.0\,\mathrm{fb}^{-1}$ of $pp$ collisions. The $\Lambda^0_b \rightarrow K^0_{\mathrm{S}}p\pi^-$ decay is observed for the first time with a significance of $8.6\,\sigma$, and a measurement is made of the $CP$ asymmetry, which is consistent with zero. No significant signals are seen for $\Lambda^0_b \rightarrow K^0_{\mathrm{S}}pK^-$ decays, $\Xi^0_b$ decays to both $K^0_{\mathrm{S}}p\pi^-$ and $K^0_{\mathrm{S}}pK^-$ final states, and the $\Lambda^0_b \rightarrow D^-_s (K^0_{\mathrm{S}}K^-)p decay, and upper limits on their branching fractions are reported.

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Conference: Large Hadron Collider Physics conference - LHCP
© CERN Geneva

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2014-06-12
15:13
LHCb: Quarkonia production in $p$-­Pb collision at LHCb
Reference: Poster-2014-437
Keywords:  flavour physics  quarkonium
Created: 2014. -1 p
Creator(s): Li, Y; Yang, Z

The production of $J/\psi$ and $\Upsilon$ 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 and transverse momentum pT < 15 GeV/c, in proton-lead collisions at a proton-nucleon centre-of-mass energy$\sqrt{s}$ NN = 5 TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 1.6 nb$^{−1}$. The forward-backward production ratio and the nuclear modification factor are determined for $J/\psi$ and Y(1S). Indication of forward backward production asymmetry is observed. There is also an indication of $J/\psi$ and Y(1S)production suppression with respect to proton-proton collisions in forward region and anti-shadowing effect in backward region.

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Conference: Large Hadron Collider Physics conference - LHCP
© CERN Geneva

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2014-06-12
13:25
LHCb: The Front-End electronics for the LHCb scintillating fibres detector
Reference: Poster-2014-436
Note: Oon behalf of the LHCb SciFi group.
Keywords:  detector  SciFi
Created: 2014. -1 p
Creator(s): Chanal, H; Comerma-Montells, A; Pillet, N

The LHCb detector will be upgraded during the next LHC shutdown in 2018/19. The tracker system will have a major overhaul. Its components will be replaced with new technologies in order to cope with the increased hit occupancy and radiation environment. A detector made of scintillating fibres read out by silicon photomultipliers (SiPM) is studied 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. This detector will consist of 12 planes of 5 to 6 layers of 250 $\mu$m fibres with an area of 5×6 m$^2$. Its lead to a total of 500k SiPM channels which need to will be read out at 40MHz. This talk gives an overview of the R&D status of the readout board and the PACIFIC chip. The readout board is connected to the SiPM on one side and to the experiment data-acquisition, experimental control system and services on the other side . The PACIFIC chip is a 128 channel ASIC which can be connected to one 128-channel SiPM without the need for any external component. It includes the analog signal processing and a 2 bits non-linear flash ADC for digitisation. The PACIFIC chip design highlights a very fast shaping (~10ns) and the ability to cope with different SiPM suppliers with a power consumption below 8mW per channel.

Related links:
Conference: TIPP 2014 - Technology and Instrumentation in Particle Physics
© CERN Geneva

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2014-06-12
13:12
LHCb: LHCb Upstream Tracker
Reference: Poster-2014-435
Keywords:  detector  upstream tracker  upgrade
Created: 2014. -1 p
Creator(s): Manning Jr, P; Artuso, M; Stone, S

The LHCb upgrade requires replacing the silicon strip tracker between the vertex locator and the magnet. A new design has been developed and tested based on the "stave" concept planned for the ATLAS upgrade. We will describe the new detector being constructed and show its improved performance in charged particle tracking and triggering.

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Conference: TIPP 2014 - Technology and Instrumentation in Particle Physics
© CERN Geneva

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