Nothing Special   »   [go: up one dir, main page]

CERN Accelerating science

CERN Document Server 找到 509,336 筆記錄  1 - 10下一個最後  跳到記錄: 檢索需時 0.54 秒. 
1.
Latest and near-future physics highlights from the ATLAS experiment / Giagu, Stefano (Sapienza Universita e INFN, Roma I (IT)) /ATLAS Collaboration
Slide for the ATLAS talk at BCVSPN2024
ATL-PHYS-SLIDE-2024-638.- Geneva : CERN, 2024 - 29 p. Fulltext: PDF; External link: Original Communication (restricted to ATLAS)
2.
Interpolating amplitudes / Bresó, Víctor (U. Heidelberg, ITP) ; Heinrich, Gudrun (KIT, Karlsruhe, TP) ; Magerya, Vitaly (CERN) ; Olsson, Anton (KIT, Karlsruhe, TP)
While the calculation of scattering amplitudes at higher orders in perturbation theory has reached a high degree of maturity, their usage to produce physical predictions within Monte Carlo programs is often hampered by the slow evaluation of the multi-loop amplitudes, especially so for amplitudes calculated numerically. [...]
CERN-TH-2024-211 ; KA-TP-23-2024 ; P3H-24-092 ; arXiv:2412.09534.
- 43.
Fulltext
3.
Implementation of Light Diagnostics for Wakefields at AWAKE / Mezger, Jan (Munich, Max Planck Inst. ; Tech. U., Munich (main)) ; Bergamaschi, Michele (Munich, Max Planck Inst. ; CERN) ; Ranc, Lucas (Munich, Max Planck Inst.) ; Sublet, Alban (CERN) ; Pucek, Jan (Munich, Max Planck Inst. ; CERN) ; Turner, Marlene (CERN) ; Clairembaud, Arthur (Munich, Max Planck Inst. ; Tech. U., Munich (main)) ; Muggli, Patric (Munich, Max Planck Inst.)
We describe the implementation of light diagnostics for studying the self-modulation instability of a long relativistic proton bunch in a 10m-long plasma. [...]
arXiv:2412.09255.
- 12.
Fulltext
4.

CERN-PHOTO-202412-324
© 2024 CERN
Signature of the letter of appointment by Mark Thomson
Signature of the letter of appointment by Mark Tho [...]
12-12-2024
5.
Not yet available
The Super Fine-Grained Detector (SuperFGD) for the T2K neutrino oscillation experiment / Sgalaberna, Davide (speaker) (ETH Zurich (CH))
T2K is a long-baseline neutrino oscillation experiment in Japan that searches for leptonic CP violation. The magnetised near detector (ND280) has the role of constraining the dominant systematic uncertainties, related to the neutrino flux and interaction cross section, in the measurement of the neutrino oscillation probability. [...]
2024 - 4250. Detector Seminar External link: Event details In : The Super Fine-Grained Detector (SuperFGD) for the T2K neutrino oscillation experiment
6.

CERN-PHOTO-202412-323
© 2024 CERN
Portrait of Ugo Amaldi
Portrait of Ugo Amaldi in his office
13-12-2024
7. Time resolution studies for SpaCal technology with single-sided readout
Reference: Poster-2024-1206
Created: 2024. -1 p
Creator(s): Bellavista, Alberto

During Runs 5 and 6, the LHCb experiment at CERN will operate at a luminosity up to 1.5 x 10$^{34}$ cm$^{-2s^-1}$, requiring substantial upgrades to its Electromagnetic Calorimeter (ECAL) to handle high radiation doses and achieve time resolutions of few tens of picoseconds mitigating pile-up effects. The detector under development is a Spaghetti Calorimeter (SpaCal) composed of scintillating fibres (polystyrene or garnet crystals) in a dense absorber (lead or tungsten). Ongoing investigations are focused on the photodetectors (PMTs) selection and their impact on the overall timing performance. Simulation studies of a lead-polystyrene module show that fast PMTs result in worse time resolutions due to the longitudinal showers' fluctuations, which introduce a bias in the time stamps defined by the Constant Fraction Discriminator (CFD) algorithm. A correction procedure has been developed to remove such bias, improving the time resolution by few tens of picoseconds. Additionally, a correlation between signal rise time and shower depth has been observed. Data from a test beam campaign conducted at the CERN SPS in June 2024 have been analysed to measure the timing resolution of two tungsten-polystyrene SpaCal prototypes, comparing four PMT models and two fibre types. By exploiting a rise-time-based correction procedure, time resolutions below 20 ps at high energies have been reached, with the fastest PMTs undergoing larger corrections, as expected from simulations.

© CERN Geneva

Fulltext
8.

CERN-PHOTO-202412-319
© 2024 CERN
CMS opening EndCap
CMS opening EndCap
13-12-2024
9. Measurement of the CKM angle $\gamma$ in $B^{\pm} \to D K^*(892)^{\pm}$ decays
Reference: Poster-2024-1205
Created: 2024. -1 p
Creator(s): Suljik, Fidan

A measurement of the CKM angle $\gamma$ is performed in $B^{\pm} \to D K^*(892)^{\pm}$ decays at the LHCb experiment, where $D$ represents a superposition of $D^0$ and $\overline{D}{}^0$ states. Using the dataset collected during Run 1 and Run 2, this analysis represents a comprehensive study of this channel, with the $D$ meson reconstructed in two-body final states $K^{\pm}\pi^{\mp}$, $K^+K^-$ and $\pi^+\pi^-$; four-body final states $K^{\pm}\pi^{\mp}\pi^{\pm}\pi^{\mp}$ and $\pi^+\pi^-\pi^+\pi^-$; and three-body final states $K^0_{S} \pi^+\pi^-$ and $K^0_{S} K^+ K^-$. This measurement constitutes the first observation of the suppressed $B^{\pm} \to [\pi^+K^-]_D K^{*\pm}$ and $B^{\pm} \to [\pi^+K^-\pi^+\pi^-]_D K^{*\pm}$ decays. The combined result gives $\gamma=(63\pm 13)^\circ$.

© CERN Geneva

Fulltext
10. Primary vertex timing reconstruction with the LHCb RICH detectors
Reference: Poster-2024-1204
Created: 2024. -1 p
Creator(s): Malentacca, Lorenzo

The LHCb RICH detector will undergo a significant upgrade during LS3 as part of an approved enhancement program to introduce fast-timing information. The upgrade will address the challenges posed by increased particle multiplicity and high occupancy anticipated for the LHC HL phase. Integrating sub-100 ps timing information is crucial for maintaining excellent particle identification (PID) performance. In the RICH detector, Cherenkov photons from a track arrive nearly simultaneously at the detector plane, allowing precise hit time prediction. Determining the primary vertex time (PV T$_0$) is key to accurately predicting the time of arrival of photons on the photodetector plane. By integrating time information in the RICH reconstruction, a software time gate can be applied around the predicted time per track to enhance signal-to-background ratio and PID performance. This contribution describes the integration of fast-timing information into the RICH detector, focusing on a novel method to estimate PV T$_0$ using only RICH information.

© CERN Geneva

Fulltext

CERN Document Server : 找到 509,336 筆記錄   1 - 10下一個最後  跳到記錄:
您想得到有關這檢索條件的最新結果嗎?
建立您的 電郵警報 或訂閱 RSS feed.