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Timepix4, a large area pixel detector readout chip which can be tiled on 4 sides providing sub-200 ps timestamp binning
/ Llopart, X (CERN) ; Alozy, J (CERN) ; Ballabriga, R (CERN) ; Campbell, M (CERN) ; Casanova, R (Barcelona, IFAE) ; Gromov, V (Nikhef, Amsterdam) ; Heijne, E H M (CERN ; IEAP CTU, Prague) ; Poikela, T (CERN) ; Santin, E (CERN) ; Sriskaran, V (CERN) et al.
Timepix4 is a 24.7 × 30.0 mm$^{2}$ hybrid pixel detector readout ASIC which has been designed to permit detector tiling on 4 sides. It consists of 448 × 512 pixels which can be bump bonded to a sensor with square pixels at a pitch of 55 µm. [...]
2022 - 15 p.
- Published in : JINST 17 (2022) C01044
Fulltext: PDF;
In : 22nd International Workshop on Radiation Imaging Detectors, Online, 27 Jun - 1 Jul 2021, pp.C01044
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2.
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Study of low power front-ends for hybrid pixel detectors with sub-ns time tagging
/ Llopart, X (CERN) ; Alozy, J (CERN) ; Ballabriga, R (CERN) ; Campbell, M (CERN) ; Egidos, N (CERN) ; Fernandez, J M (CERN) ; Heijne, E (CERN) ; Kremastiotis, I (CERN) ; Santin, E (CERN) ; Tlustos, L (CERN) et al.
Power consumption is always a concern in the design of readout chips for hybrid pixel
detectors. The Timepix3 chip is capable of dealing with up to 80 Mhits/cm$^2$/sec and tagging each hit
within a time bin of 1.56 ns. [...]
2019 - 9 p.
- Published in : JINST 14 (2019) C01024
In : 20th International Workshop On Radiation Imaging Detectors, Sundsvall, Sweden, 24 - 28 Jun 2018, pp.C01024
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3.
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Introducing Timepix2, a frame-based pixel detector readout ASIC measuring energy deposition and arrival time
/ Wong, W S ; Alozy, J (CERN) ; Ballabriga, R (CERN) ; Campbell, M (CERN) ; Kremastiotis, I (CERN) ; Llopart, X (CERN) ; Poikela, T (CERN) ; Sriskaran, V (CERN) ; Tlustos, L (CERN ; Freiburg U. ; U. Houston (main)) ; Turecek, D (U. Houston (main) ; Unlisted, CZ ; Charles U., Prague (main))
The Timepix2 ASIC (application-specific integrated circuit) is the upgraded successor to the Timepix [1] hybrid pixel detector readout chip. Like the original, Timepix2 contains a matrix of 65k square pixels of 55 μm pitch that can be coupled to a similarly segmented semiconductor sensor, or integrated in an ionising gas detector. [...]
2020 - 8 p.
- Published in : Radiat. Meas. 131 (2020) 106230
Fulltext: PDF;
In : The Medipix/Timepix ASIC family and its applications, pp.106230
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4.
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Extending a 65nm CMOS process design kit for high total ionizing dose effects
/ Nikolaou, Aristeidis (Natl. Tech. U., Athens) ; Bucher, Matthias (Natl. Tech. U., Athens) ; Makris, Nikos (Natl. Tech. U., Athens) ; Papadopoulou, Alexia (Natl. Tech. U., Athens) ; Chevas, Loukas (Natl. Tech. U., Athens) ; Borghello, Giulio (Udine U.) ; Koch, Henri D (U. Mons) ; Kloukinas, Kostas (CERN) ; Poikela, Tuomas S (CERN) ; Faccio, Federico (CERN)
Standard CMOS Process Design Kits (PDKs) do not address degradation the technology incurs when exposed to high Total Ionizing Dose (TID). Front-end electronics for the High-Luminosity Large Hadron Collider are expected to be exposed up to ten-fold doses. [...]
2018 - 4 p.
- Published in : 10.1109/MOCAST.2018.8376561
In : 7th International Conference on Modern Circuits and Systems Technologies, Thessaloniki, Greece, 7 - 9 May 2018
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5.
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Measurement of the shape of the $\Lambda_b^0\to\Lambda_c^+ \mu^- \overline{\nu}_{\mu}$ differential decay rate
/ LHCb Collaboration
A measurement of the shape of the differential decay rate and the associated Isgur-Wise function for the decay $\Lambda_b^0\to\Lambda_c^+\mu^-\overline{\nu}$ is reported, using data corresponding to $3 fb^{-1}$ collected with the LHCb detector in proton-proton collisions. The $\Lambda_c^+\mu^-\overline{\nu}$(+ anything) final states are reconstructed through the detection of a muon and a $\Lambda_c^+$ baryon decaying into $pK^-\pi^+$, and the decays $\Lambda_b^0\to\Lambda_c^+\pi^+\pi^-\mu^-\overline{\nu}$ are used to determine contributions from $\Lambda_b^0\to \Lambda_c^{\star+}\mu ^-\bar{\nu}$ decays. [...]
arXiv:1709.01920; CERN-EP-2017-164; LHCB-PAPER-2017-016; CERN-PH-EP-2017-164.-
Geneva : CERN, 2017-12-13 - 15 p.
- Published in : Phys. Rev. D 96 (2017) 112005
Fulltext: arXiv:1709.01920 - PDF; 10.1103_PhysRevD.96.112005 - PDF; Related data file(s): ZIP; External link: Figures, tables and other information
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6.
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The VeloPix ASIC
/ Poikela, Tuomas (CERN) ; Ballabriga, R (CERN) ; Buytaert, J (CERN) ; Llopart, X (CERN) ; Wong, W (CERN) ; Campbell, M (CERN) ; Wyllie, K (CERN) ; van Beuzekom, M (NIKHEF, Amsterdam) ; Schipper, J (NIKHEF, Amsterdam) ; Miryala, S (NIKHEF, Amsterdam) et al.
VeloPix, a 130 nm CMOS technology chip with data driven and zero suppressed readout, will be used as a readout chip for the hybrid pixel system of the LHCb Vertex Locator (VELO) upgrade. The upgrade, scheduled for LHC Run-3, will enable the experiment to be read out at 40 MHz in trigger-less mode, with event selection being performed in the CPU farm. [...]
2017 - 8 p.
- Published in : JINST 12 (2017) C01070
In : Topical Workshop on Electronics for Particle Physics, Karlsruhe, Germany, 26 - 30 Sep 2016, pp.C01070
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7.
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Study of prompt D$^0$ meson production in pPb collisions at $\sqrt{s}$=5 TeV
/ LHCb Collaboration
Production of prompt D$^0$ mesons is studied in proton-lead and lead-proton collisions recorded at the LHCb detector at the LHC. The data sample corresponds to an integrated luminosity of $1.58\pm0.02$ nb$^{-1}$ recorded at a nucleon-nucleon centre-of-mass energy of $\sqrt{s}=5$ TeV. [...]
arXiv:1707.02750; LHCB-PAPER-2017-015; LHCb-PAPER-2017-015; CERN-EP-2017-135; LHCB-PAPER-2017-015.-
Geneva : CERN, 2017-10-12 - 27 p.
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary information: ZIP; External link: Figures, tables and other information
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8.
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Updated branching fraction measurements of $B^0_{(s)} \to K_{\mathrm{\scriptscriptstyle S}}^0 h^+ h^{\prime -}$ decays
/ LHCb Collaboration
The charmless three-body decays $B^0_{(s)} \to K_{\mathrm{\scriptscriptstyle S}}^0 h^+ h^{\prime -}$ (where $h^{(\prime)} = \pi, K$) are analysed using a sample of $pp$ collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of $3\mbox{fb}^{-1}$. The branching fractions are measured relative to that of the $B^0 \to K_{\mathrm{\scriptscriptstyle S}}^0 \pi^{+} \pi^{-}$ decay, and are determined to be: \begin{eqnarray*} \frac{{\cal B}(B^0\rightarrow K^0_{\rm S}K^{\pm}\pi^{\mp})}{{\cal B}(B^0\rightarrow K^0_{\rm S}\pi^{+}\pi^{-})} = {} & 0.123 \pm 0.009 \; \mathrm{\,(stat)}\; \pm 0.015 \; \mathrm{\,(syst)}\,, \frac{{\cal B}(B^0\rightarrow K^0_{\rm S}K^{+}K^{-})} {{\cal B}(B^0\rightarrow K^0_{\rm S}\pi^{+}\pi^{-})} = {} & 0.549 \pm 0.018 \; \mathrm{\,(stat)}\; \pm 0.033 \; \mathrm{\,(syst)}\,, \frac{{\cal B}(B_{s}^0\rightarrow K^0_{\rm S}\pi^{+}\pi^{-})}{{\cal B}(B^0\rightarrow K^0_{\rm S}\pi^{+}\pi^{-})} = {} & 0.191 \pm 0.027 \; \mathrm{\,(stat)}\; \pm 0.031 \; \mathrm{\,(syst)}\; \pm 0.011 \; (f_s/f_d) \,, \frac{{\cal B}(B_{s}^0\rightarrow K^0_{\rm S}K^{\pm}\pi^{\mp})} {{\cal B}(B^0\rightarrow K^0_{\rm S}\pi^{+}\pi^{-})} = {} & 1.70\phantom{0} \pm 0.07\phantom{0} \; \mathrm{\,(stat)} \; \pm 0.11\phantom{0} \; \mathrm{\,(syst)}\; \pm 0.10\phantom{0} \; (f_s/f_d) \,, \frac{{\cal B}(B_{s}^0\rightarrow K^0_{\rm S}K^{+}K^{-})}{{\cal B}(B^0\rightarrow K^0_{\rm S}\pi^{+}\pi^{-})} \in {} & [0.008 - 0.051] \rm ~at~90\%~confidence~level, \end{eqnarray*} where $f_s/f_d$ represents the ratio of hadronisation fractions of the $B^0_s$ and $B^0$ mesons..
arXiv:1707.01665; LHCB-PAPER-2017-010; CERN-EP-2017-131.-
2017-11-08 - 42 p.
- Published in : JHEP 11 (2017) 027
Article from SCOAP3: PDF; Figures: ZIP; Fulltext: PDF; External link: Figures, tables and other information
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10.
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Study of charmonium production in ${b}$-hadron decays and first evidence for the decay ${{{B}} ^0_{{s}}} \!\rightarrow \phi \phi \phi $
/ LHCb Collaboration
Using decays to $\phi$-meson pairs, the inclusive production of charmonium states in $b$-hadron decays is studied with $pp$ collision data corresponding to an integrated luminosity of $3.0fb^{-1}$, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Denoting by $B_C\equiv B(b\to CX)\times B(C\to\phi\phi)$ the inclusive branching fraction of a $b$ hadron to a charmonium state $C$ that decays into a pair of $\phi$ mesons, ratios $R^{C1}_{C2}\equiv B_{C1}/B_{C2}$ are determined as $R^{\chi_{c0}}_{\eta_c(1S)}=0.147\pm0.023\pm0.011$, $R^{\chi_{c1}}_{\eta_c (1S)}=0.073\pm0.016\pm0.006$, $R^{\chi_{c2}}_{\eta_c (1S)}=0.081\pm0.013\pm0.005$, $R^{\chi_{c1}}_{\chi_{c0}}=0.50\pm0.11\pm0.01$, $R^{\chi_{c2}}_{\chi_{c0}}=0.56\pm0.10\pm0.01$ and $R^{\eta_c (2S)}_{\eta_c(1S)}=0.040\pm0.011\pm0.004$. [...]
arXiv:1706.07013; LHCB-PAPER-2017-007; CERN-EP-2017-099; LHCB-PAPER-2017-007.-
Springer, 2017-09-14 - 32 p.
- Published in : Eur. Phys. J. C 77 (2017) 609
Article from SCOAP3: PDF; Fulltext: arXiv:1706.07013 - PDF; Paper-2017-007 - PDF; Related data file(s): ZIP; Supplementary information: ZIP; External link: Figures, tables and other information
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