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The TORCH time-of-flight detector
/ Harnew, N (Oxford U.) ; Gao, R (Oxford U.) ; Hadavizadeh, T (Oxford U.) ; Hancock, T H (Oxford U.) ; Smallwood, J C (Oxford U.) ; Brook, N H (Bath U.) ; Bhasin, S (Bristol U.) ; Cussans, D (Bristol U.) ; Rademacker, J (Bristol U.) ; Forty, R (CERN) et al.
TORCH is a large-area time-of-flight (ToF) detector, proposed for the Upgrade-II of the LHCb experiment. It will provide charged hadron identification over a 2–20 GeV/c momentum range, given a 9.5m flight distance from the LHC interaction point. [...]
2022 - 3 p.
In : 15th Pisa Meeting on Advanced Detectors, La Biodola - Isola D'elba, Italy, 22 - 28 May 2022, pp.167991
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2.
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TORCH, a novel time of flight detector for LHCb upgrade II
/ Rademacker, J (Bristol U.) ; Blake, T (Warwick U.) ; Cicala, M F (Warwick U.) ; Conneely, T (Astrium Ltd., Stevenage) ; Cussans, D (Bristol U.) ; van Dijk, M W U (CERN) ; Forty, R (CERN) ; Frei, C (CERN) ; Gabriel, E P M (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Gao, R (JAI, UK) et al.
The plans for LHCb upgrade II in the HL LHC era include complementing the experiment’s particle identification capabilities in the low momentum region up to 10-15GeV/c with the novel TORCH time of flight detector. TORCH is designed to provide 15ps timing resolution for charged particles, resulting in K/pi (p/K) particle identification up to 10 (15)GeV/c momentum over a 10m flight path. [...]
2022 - 6 p.
- Published in : PoS: ICHEP2022, pp. 347
Fulltext: PDF;
In : 41st International Conference on High Energy Physics (ICHEP 2022), Bologna, Italy, 6 - 13 Jul 2022, pp.347
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3.
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A search for rare $B \to D \mu^+\mu^-$ decays
/ LHCb Collaboration
A search for rare $B \rightarrow D \mu^+ \mu^-$ decays is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb$^{-1}$. No significant signals are observed in the non-resonant $\mu^+\mu^-$ modes, and upper limits of $\mathcal{B}(B^0 \rightarrow \overline{D}^0 \mu^+ \mu^-) < 5.1 \times 10^{-8}$, $\mathcal{B}(B^+ \rightarrow D_s^+ \mu^+ \mu^-) < 3.2 \times 10^{-8}$, $\mathcal{B}(B_s^0 \rightarrow \overline{D}^0 \mu^+ \mu^-) < 1.6 \times 10^{-7}$ and $f_c/f_u \cdot \mathcal{B}(B_c^+ \rightarrow D_s^+ \mu^+ \mu^-) < 9.6 \times 10^{-8}$ are set at the 95 % confidence level, where $f_c$ and $f_u$ are the fragmentation fractions of a $B$ meson with a $c$ and $u$ quark respectively in proton-proton collisions. [...]
arXiv:2308.06162; LHCb-PAPER-2022-048; CERN-EP-2023-121; LHCB-PAPER-2022-048.-
Geneva : CERN, 2024-02-07 - 23 p.
- Published in : JHEP 2402 (2024) 032
Fulltext: document - PDF; 2308.06162 - PDF; Related data file(s): ZIP;
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4.
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New developments from the TORCH R&D; project
/ Jones, T (Warwick U.) ; Bhasin, S (Bath U. ; Bristol U.) ; Blake, T (Warwick U.) ; Brook, N H (Bath U.) ; Cicala, M F (Warwick U.) ; Conneely, T (Photek Ltd., UK) ; Cussans, D (Bristol U.) ; van Dijk, M W U (CERN) ; Forty, R (CERN) ; Frei, C (CERN) et al.
TORCH is a large-area and high-precision time-of-flight detector, designed to provide charged particle identification over a 2–20GeV/c momentum range. The TORCH detector comprises a 10 mm thick quartz radiator, instrumented with photon detectors, which precisely time and measure the arrival positions of the Cherenkov photons. [...]
2023 - 5 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1045 (2023) 167535
In : Vienna Conference on Instrumentation (VCI 2022), Online, Online, 21 - 25 Feb 2022, pp.167535
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Performance of a prototype TORCH time-of-flight detector
/ Bhasin, S. (Bristol U. ; Bath U.) ; Blake, T. (Warwick U.) ; Brook, N.H. (Bath U.) ; Cicala, M.F. (Warwick U.) ; Conneely, T. (Astrium Ltd., Stevenage) ; Cussans, D. (Bristol U.) ; van Dijk, M.W.U. (CERN) ; Forty, R. (CERN) ; Frei, C. (CERN) ; Gabriel, E.P.M. (Edinburgh U., Inst. Astron.) et al.
TORCH is a novel time-of-flight detector, designed to provide charged particle identification of pions, kaons and protons in the momentum range 2-20 GeV/c over a 9.5 m flight path. A detector module, comprising a 10mm thick quartz plate, provides a source of Cherenkov photons which propagate via total internal reflection to one end of the plate. [...]
arXiv:2209.13379.-
2023-03-06 - 19 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1050 (2023) 168181
Fulltext: PDF;
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Picosecond timing of charged particles using the TORCH detector
/ Cicala, Maria Flavia (Warwick U.) ; Bhasin, Srishti (Bath U. ; Bristol U.) ; Blake, Thomas (Warwick U.) ; Brook, Nick H. (Bath U.) ; Conneely, Thomas (Unlisted, UK) ; Cussans, David (Bristol U.) ; van Dijk, Maarten W.U. (CERN) ; Forty, Roger (CERN) ; Frei, Christoph (CERN) ; Gabriel, Emmy P.M. (Edinburgh U.) et al.
TORCH is a large-area, high-precision time-of-flight (ToF) detector designed to provide charged-particle identification in the 2-20 GeV$/c$ momentum range. Prompt Cherenkov photons emitted by charged hadrons as they traverse a 10mm quartz radiator are propagated to the periphery of the detector, where they are focused onto an array of micro-channel plate photomultiplier tubes (MCP-PMTs). [...]
arXiv:2203.13774.-
2022-09-01 - 13 p.
Fulltext: 2203.13774 - PDF; Publication - PDF;
In : Vienna Conference on Instrumentation (VCI 2022), Online, Austria, 21 - 25 Feb 2022, pp.166950
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7.
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Constraints on the CKM angle $\gamma$ from $B^\pm\rightarrow Dh^\pm$ decays using $D\rightarrow h^\pm h^{\prime\mp}\pi^0$ final states
/ LHCb Collaboration
A data sample collected with the LHCb detector, corresponding to an integrated luminosity of $9~{\rm fb}^{-1}$, is used to measure $CP$ observables in $B^\pm \to D h^\pm$ decays, where $h^{(\prime)}$ is either a kaon or a pion, and the neutral $D$ meson decay is reconstructed in the three-body final states $K^\pm \pi^\mp \pi^0$, $\pi^\pm \pi^\mp \pi^0$, and $K^\pm K^\mp \pi^0$. The most suppressed of these modes, $B^\pm \to [\pi^\pm K^\mp \pi^0]_D K^\pm$, is observed with a significance greater than seven standard deviations and constraints on the CKM angle $\gamma$ are calculated from the combination of the measurements..
arXiv:2112.10617; LHCb-PAPER-2021-036; CERN-EP-2021-255; LHCB-PAPER-2021-036.-
Geneva : CERN, 2022-07-15 - 24 p.
- Published in : JHEP 2207 (2022) 099
Fulltext: document - PDF; 2112.10617 - PDF; Related data file(s): ZIP;
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Identification of charm jets at LHCb
/ LHCb Collaboration
The identification of charm jets is achieved at LHCb for data collected in 2015-2018 using a method based on the properties of displaced vertices reconstructed and matched with jets. The performance of this method is determined using a dijet calibration dataset recorded by the LHCb detector and selected such that the jets are unbiased in quantities used in the tagging algorithm. [...]
arXiv:2112.08435; LHCb-DP-2021-006.-
2022-02-22 - 22 p.
- Published in : JINST 17 (2022) P02028
Fulltext: document - PDF; Aaij_2022_J._Inst._17_P02028 - PDF; 2112.08435 - PDF;
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Precision measurement of forward $Z$ boson production in proton-proton collisions at $\sqrt{s} = 13$ TeV
/ LHCb Collaboration
A precision measurement of the $Z$ boson production cross-section at $\sqrt{s} = 13$ TeV in the forward region is presented, using $pp$ collision data collected by the LHCb detector, corresponding to an integrated luminosity of 5.1 fb$^{-1}$. The production cross-section is measured using $Z\rightarrow\mu^+\mu^-$ events within the fiducial region defined as pseudorapidity $2.0<\eta<4.5$ and transverse momentum $p_{T}>20$ GeV/$c$ for both muons and dimuon invariant mass $60 < M_{\mu\mu}<120$ GeV/$c^2$. [...]
arXiv:2112.07458; LHCb-PAPER-2021-037; CERN-EP-2021-246; LHCB-PAPER-2021-037.-
Geneva : CERN, 2022-07-05 - 57 p.
- Published in : JHEP 2207 (2022) 026
Fulltext: PDF; Related data file(s): ZIP;
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10.
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Observation of $\Lambda_b^0\rightarrow D^+ p \pi^-\pi^-$ and $\Lambda_b^0\rightarrow D^{*+} p \pi^-\pi^-$ decays
/ LHCb Collaboration
The multihadron decays $\Lambda_b^0\rightarrow D^+ p \pi^-\pi^-$ and $\Lambda_b^0\rightarrow D^{*+} p \pi^-\pi^-$ are observed in data corresponding to an integrated luminosity of 3fb$^{-1}$, collected in proton-proton collisions at centre-of-mass energies of 7 and 8TeV by the LHCb detector. Using the decay $\Lambda_b^0\rightarrow \Lambda_c^+ \pi^+ \pi^-\pi^-$ as a normalisation channel, the ratio of branching fractions is measured to be
arXiv:2112.02013; LHCb-PAPER-2021-040; CERN-EP-2021-237; LHCB-PAPER-2021-040.-
Geneva : CERN, 2022-03-23 - 30 p.
- Published in : JHEP 2203 (2022) 153
Fulltext: document - PDF; 2112.02013 - PDF; Related data file(s): ZIP;
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