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1.
PICOSEC-Micromegas Detector, an innovative solution for Lepton Time Tagging / Kallitsopoulou, A. (IRFU, Saclay) ; Aleksan, R. (IRFU, Saclay) ; Angelis, Y. (Aristotle U., Thessaloniki) ; Aune, S. (IRFU, Saclay) ; Bortfeldt, J. (Munich U.) ; Brunbauer, F. (CERN) ; Brunoldi, M. (Pavia U. ; INFN, Pavia) ; Chatzianagnostou, E. (Aristotle U., Thessaloniki) ; Datta, J. (SUNY, Stony Brook) ; Desforge, D. (IRFU, Saclay) et al.
The PICOSEC-Micromegas (PICOSEC-MM) detector is a novel gaseous detector designed for precise timing resolution in experimental measurements. It eliminates time jitter from charged particles in ionization gaps by using extreme UV Cherenkov light emitted in a crystal, detected by a Micromegas photodetector with an appropriate photocathode. [...]
arXiv:2411.02532.- 2024-10-16 - 4 p. Fulltext: PDF;
2.
Photocathode characterisation for robust PICOSEC Micromegas precise-timing detectors / Lisowska, M. (CERN ; IRFU, Saclay) ; Aleksan, R. (IRFU, Saclay) ; Angelis, Y. (Aristotle U., Thessaloniki) ; Aune, S. (IRFU, Saclay) ; Bortfeldt, J. (Munich U.) ; Brunbauer, F. (CERN) ; Brunoldi, M. (Pavia U. ; INFN, Pavia) ; Chatzianagnostou, E. (Aristotle U., Thessaloniki) ; Datta, J. (SUNY, Stony Brook) ; Dehmelt, K. (Jefferson Lab) et al.
The PICOSEC Micromegas detector is a~precise-timing gaseous detector based on a~Cherenkov radiator coupled with a~semi-transparent photocathode and a~Micromegas amplifying structure, targeting a~time resolution of tens of picoseconds for minimum ionising particles. Initial single-pad prototypes have demonstrated a~time resolution below 25 ps, prompting ongoing developments to adapt the concept for High Energy Physics applications, where sub-nanosecond precision is essential for event separation, improved track reconstruction and particle identification. [...]
arXiv:2407.09953.- 2024-12-10 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1072 (2025) 170151 Fulltext: 2407.09953 - PDF; 1732afb3515e2b936d222cb357afcde6 - PDF; External link: Fermilab Library Server
3.
A Novel Diamond-like Carbon based photocathode for PICOSEC Micromegas detectors / Wang, X. (USTC, Hefei ; Hefei, CUST) ; Aleksan, R. (IRFU, Saclay) ; Angelis, Y. (Aristotle U., Thessaloniki) ; Bortfeldt, J. (LMU Munich (main)) ; Brunbauer, F. (CERN) ; Brunoldi, M. (Pavia U. ; INFN, Pavia) ; Chatzianagnostou, E. (Aristotle U., Thessaloniki) ; Datta, J. (Stony Brook U.) ; Degmelt, K. (Jefferson Lab) ; Fanourakis, G. (Democritos Nucl. Res. Ctr.) et al.
The PICOSEC Micromegas (MM) detector is a precise timing gaseous detector based on a MM detector operating in a two-stage amplification mode and a Cherenkov radiator. Prototypes equipped with cesium iodide (CsI) photocathodes have shown promising time resolutions as precise as 24 picoseconds (ps) for Minimum Ionizing Particles. [...]
arXiv:2406.08712.- 2024-08-12 - 15 p. - Published in : JINST 19 (2024) P08010 Fulltext: 806956891d4956950d85abdbaee8cf0d - PDF; 2406.08712 - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server
4.
Timing-based mass measurement of exotic long-lived particles at the FCC-ee / Aleksan, Roy (IRFU, Saclay) ; Perez, Emmanuel (CERN) ; Polesello, Giacomo (INFN, Pavia) ; Valle, Nicolò (INFN, Pavia)
The very high luminosity run foreseen at the $Z$-pole for the FCC-ee will allow the detection in $Z$ decays of new particles with very low couplings to the Standard Model. [...]
arXiv:2406.05102.
- 16 p.
Fulltext
5.
Single channel PICOSEC Micromegas detector with improved time resolution / Utrobicic, A. (Boskovic Inst., Zagreb) ; Aleksan, R. (IRFU, Saclay) ; Angelis, Y. (Aristotle U., Thessaloniki) ; Bortfeldt, J. (Munich U.) ; Brunbauer, F. (CERN) ; Brunoldi, M. (Pavia U. ; INFN, Pavia) ; Chatzianagnostou, E. (Aristotle U., Thessaloniki) ; Datta, J. (SUNY, Stony Brook) ; Dehmelt, K. (Jefferson Lab) ; Fanourakis, G. (American Coll. of Greece) et al.
This paper presents design guidelines and experimental verification of a single-channel PICOSEC Micromegas (MM) detector with an improved time resolution. The design encompasses the detector board, vessel, auxiliary mechanical parts, and electrical connectivity for high voltage (HV) and signals, focusing on improving stability, reducing noise, and ensuring signal integrity to optimize timing performance. [...]
arXiv:2406.05657; FERMILAB-PUB-24-0499-CMS-V.- 2024-12-16 - 29 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1072 (2025) 170127 Fulltext: 2406.05657 - PDF; 9799b01fc06dbef84710538b6ae3d6d9 - PDF; External link: Fermilab Library Server
6.
Measuring the angle $\alpha_{ds}$ of the flattest Unitary Triangle with $\overline{B}_{d}\to \phi \overline{K}^{(*)0},\overline{B}_{s}\to \phi{K}^{(*)0}$ decays / Aleksan, Roy (IRFU, Saclay) ; Oliver, Luis (IJCLab, Orsay) ; Perez, Emmanuel (CERN)
We show that the angle $\alpha_{ds}$ of the ``flattest'' unitarity triange can be directly measured using the decays $\overline{B}_{d}\to \phi \overline{K}^{(*)0}$ and $\overline{B}_{s}\to \phi{K}^{(*)0}$. [...]
arXiv:2402.09987.
- 19 p.
Fulltext
7.
Study of CP violation in $B^\pm$ decays to $\overline{D^0}(D^0) K^\pm$ at FCCee / Aleksan, R. (IRFU, Saclay) ; Oliver, L. (IJCLab, Orsay) ; Perez, E. (CERN)
The great progress made recently in the sector of Flavor Physics has enabled to establish CP violation in the B-meson decays. [...]
arXiv:2107.05311.
- 22 p.
Fulltext
8.
CP violation and determination of the $bs$ "flat" unitarity triangle at FCCee / Aleksan, Roy (IRFU, Saclay) ; Oliver, L. (IJCLab, Orsay) ; Perez, Emmanuel (CERN)
We investigate the sensitivity with which two angles of the "flat" unitarity triangle, defined by $V_{ub}^* V_{us} + V_{cb}^* V_{cs} + V_{tb}^* V_{ts} =0$, can possibly be measured directly at FCCee. We show that the measured errors on the angle $\alpha_s = \arg(- V_{ub}^* V_{us} /V_{tb}^* V_{ts})$ and $\beta_s = \arg(-V_{tb}^* V_{ts} / V_{cb}^* V_{cs})$ should be better than $0.4^\circ$ and $0.035^\circ$, respectively. [...]
arXiv:2107.02002.- 2022-03-01 - 27 p. - Published in : Phys. Rev. D 105 (2022) 053008 Fulltext: PDF; Fulltext from publisher: PDF;
9.
Scenarios for Circular Gamma-Gamma Higgs Factories / Aleksan, Roy (CEA, DSM, Saclay ; IRFU, Saclay) ; Apyan, Armen (Northwestern U.) ; Papaphilippou, Yannis (CERN) ; Zimmermann, Frank (CERN)
The Higgs boson can be produced directly in gamma-gamma collisions generated by laser Compton back scattering off 80-90 GeV electron or positron beams. We discuss options for realizing a gamma-gamma Higgs factory using a high-energy circular e⁺e⁻ collider, such as FCC-ee or CEPC, and/or its top-up injector ring, and compare the parameters and advantages of such a facility, including the expected performance, with those for a Higgs factory based on a recirculating linac, such as SAPPHiRE..
CERN-ACC-2015-263.- 2015 - 4 p. - Published in : (2015) , pp. TUPTY057 Published version from JACoW: PDF; External link: JACOW
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.TUPTY057
10.
Summary of the 1st EuCAN Workshop "Universities meet laboratories (ULA2014)" / Aleksan, R (CEA,) ; Anelli, G (CERN,) ; Appleby, R (U. Manchester/CI,) ; Arduini, G (CERN,) ; Assmann, R (DESY,) ; Aulenbacher, K (JGU Mainz,) ; Bambade, P (CNRS/IN2P3/LAL,) ; Barletta, W (USPAS & MIT,) ; Boine-Frankenheim, O (TU Darmstadt/GSI,) ; Burrows, P (U. Oxford/JAI,) et al.
The 1st EuCAN workshop ULA2014 illuminated the interplay of universities and laboratories. [...]
CERN-ACC-2014-0287.
- 2014.
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