CERN Accelerating science

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1.
Measurement of the hard exclusive $\pi^{0}$ muoproduction cross section at COMPASS / COMPASS Collaboration
A new and detailed measurement of the cross section for hard exclusive neutral-pion muoproduction on the proton was performed in a wide kinematic region, with the photon virtuality $Q^2$ ranging from 1 to 8 (GeV/$c$)$^{\rm\, 2}$ and the Bjorken variable $x_{\rm Bj}$ ranging from 0.02 to 0.45. [...]
arXiv:2412.19923.
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Multiplicities of positive and negative pions, kaons and unidentified hadrons from deep-inelastic scattering of muons off a liquid hydrogen target / Alexeev, G.D. (Unlisted) ; Alexeev, M.G. (INFN, Turin ; U. Turin (main)) ; Alice, C. (INFN, Turin ; U. Turin (main)) ; Amoroso, A. (INFN, Turin ; U. Turin (main)) ; Andrieux, V. (Illinois U., Urbana (main)) ; Anosov, V. (Unlisted) ; Augsten, K. (Prague, Tech. U.) ; Augustyniak, W. (NCBJ, Warsaw) ; Azevedo, C.D.R. (Aveiro U.) ; Badelek, B. (Warsaw U.) et al.
The multiplicities of positive and negative pions, kaons and unidentified hadrons produced in deep-inelastic scattering are measured in bins of the Bjorken scaling variable $x$, the relative virtual-photon energy $y$ and the fraction of the virtual-photon energy transferred to the final-state hadron $z$. [...]
CERN-EP-2024-270 ; arXiv:2410.12005.
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Not yet available
Technical challenges for the new T2K High Angle TPCs / Levorato, Stefano (speaker) (INFN Trieste, INFN Padova and CERN)
The Near Detector of the T2K experiment at J-PARC has recently being upgraded  in order to reduce the present systematic uncertainties affecting the oscillation parameters measurements and to exploit the increased neutrino beam power of the J-PARC complex.  One of the major improvements to the T2K ND280 detector consisted of the integration of two large size (~ 3m3  each)  new horizontal High -Angle Time-Projection Chambers (HATPC).  The new HATPCs are based on a gaseous active volume contained in a Field Cage made of lightweight composite material, combining optimal mechanical and electrical properties with minimal radiation length and dead volume. The readout is performed by innovative Resistive Micromegas modules featuring a resistive layer for charge spreading on top of the readout plane to enhance spatial resolution performance. The mentioned technologies have been studied during several test beams and cosmic rays campaigns [...]
2024 - 4211. Detector Seminar External link: Event details In : Technical challenges for the new T2K High Angle TPCs
4.
First joint oscillation analysis of Super-Kamiokande atmospheric and T2K accelerator neutrino data / T2K Collaboration
The Super-Kamiokande and T2K collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric and beam neutrino data. [...]
arXiv:2405.12488.
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Addendum to the Letter of Intent CERN-SPSC-2023-021 ; SPSC-I-260 / Hyper-Kamiokande Collaboration
In August 2023 the Letter of Intent titled ``The Hyper-K Underwater Electronics Assembly project'' (CERN-SPSC-2023-021, SPSC-I-260) was submitted. [...]
CERN-SPSC-2024-004 ; SPSC-M-796.
- 2024.
Fulltext - Original Document (SPSC-I-260)
6.
High-Statistics Measurement of Collins and Sivers Asymmetries for Transversely Polarized Deuterons / COMPASS Collaboration
New results are presented on a high-statistics measurement of Collins and Sivers asymmetries of charged hadrons produced in deep inelastic scattering of muons on a transversely polarised $^6$LiD target. The data were taken in 2022 with the COMPASS spectrometer using the 160 \gevv muon beam at CERN, balancing the existing data on transversely polarised proton targets. [...]
arXiv:2401.00309; CERN-EP-2023-308.- 2024-09-05 - 10 p. - Published in : Phys. Rev. Lett. 133 (2024) 101903 Fulltext: 2401.00309 - PDF; Publication - PDF;
7.
Final COMPASS results on the transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan process / COMPASS Collaboration
The COMPASS Collaboration performed measurements of the Drell-Yan process in 2015 and 2018 using a 190 GeV/c $\pi^{-}$ beam impinging on a transversely polarised ammonia target. Combining the data of both years, we present final results on the amplitudes of the five azimuthal modulations in the dimuon production cross section. [...]
arXiv:2312.17379; CERN-EP-2023-307.- 2024-08-14 - 8 p. - Published in : Phys. Rev. Lett. 133 (2024) 071902 Fulltext: 2312.17379 - PDF; Publication - PDF;
8.
Progress in coupling MPGD-based photon detectors with nanodiamond photocathodes / Brunbauer, F.M. (CERN) ; Chatterjee, C. (INFN, Trieste) ; Cicala, G. (Bari U. ; INFN, Bari) ; Cicuttin, A. (ICTP, Trieste ; INFN, Trieste) ; Crespo, M.L. (ICTP, Trieste ; INFN, Trieste) ; D‘Ago, D. (INFN, Trieste ; Trieste U.) ; Dalla Torre, S. (INFN, Trieste) ; Dasgupta, S. (INFN, Trieste) ; Gregori, M. (INFN, Trieste) ; Levorato, S. (INFN, Trieste) et al.
The next generation of gaseous photon detectors is requested to overcome the limitations of the available technology, in terms of resolution and robustness. The quest for a novel photocathode, sensitive in the far vacuum ultra violet wavelength range and more robust than present ones, motivated an R&D; programme to explore nanodiamond based photoconverters, which represent the most promising alternative to cesium iodine. [...]
arXiv:2401.17485.- 2023-08-05 - 5 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1056 (2023) 168575 Fulltext: PDF;
In : 11th International Workshop on Ring Imaging Cherenkov Detectors (RICH 2022), Edinburgh, United Kingdom, 12 - 16 Sep 2022, pp.168575
9.
The high voltage system of the novel MPGD-based photon detectors of COMPASS RICH-1 and its development towards a scalable High Voltage Power Supply System for MPGDs / Bressan, A (INFN, Trieste ; Trieste U.) ; Carrato, S (INFN, Trieste ; Trieste U.) ; Chatterjee, C (INFN, Trieste) ; Cicuttin, A (ICTP, Trieste ; INFN, Trieste) ; Crespo, M L (ICTP, Trieste ; INFN, Trieste) ; D'Ago, D (INFN, Trieste ; Trieste U.) ; Dalla Torre, S (INFN, Trieste) ; Dasgupta, S (INFN, Trieste ; Bhubaneswar, NISER) ; Ballina E , M G (ICTP, Trieste) ; Florian S , W (ICTP, Trieste ; INFN, Trieste ; Trieste U.) et al.
The COMPASS RICH-1 detector has undergone a major upgrade in 2016 with the installation of four novel MPGD-based photon detectors. They consist of large-size hybrid MPGDs with multi-layer architecture composed of two layers of Thick-GEMs and bulk resistive MicroMegas. [...]
2023 - 4 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1056 (2023) 168558
In : 11th International Workshop on Ring Imaging Cherenkov Detectors (RICH 2022), Edinburgh, United Kingdom, 12 - 16 Sep 2022, pp.168558
10.
The Hyper-K Underwater Electronics Assembly project / Hyper-Kamiokande Collaboration
Starting in 2027, the Hyper-Kamiokande experiment in Japan will search for leptonic CP violation in long-baseline accelerator neutrino oscillations with a realistic potential of discovery within 3 to 10 years from the start of the data taking depending on the value of the CP violating phase, to be measured with a resolution better than $23^{\circ}$. [...]
CERN-SPSC-2023-021 ; SPSC-I-260.
- 2023.
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