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Spectroscopy of Strange Mesons and First Observation of a Strange Crypto-Exotic State with $J^P=0^-$ with COMPASS / Wallner, Stefan (speaker) (MPP (Munich))
We measured the strange-meson spectrum in the scattering reaction $K^- + p\to K^-\pi^-\pi^+ + p$ with the COMPASS spectrometer at CERN. Using the world's largest sample of this reaction, we performed a comprehensive partial-wave analysis of the mesonic final state [...]
2025 - 3250. EP Seminar External link: Event details In : Spectroscopy of Strange Mesons and First Observation of a Strange Crypto-Exotic State with $J^P=0^-$ with COMPASS
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Spectroscopy of Strange Mesons and First Observation of a Strange Crypto-Exotic State with $J^P=0^-$ / COMPASS Collaboration
We measured the strange-meson spectrum in the scattering reaction $K^{-}+p \rightarrow K^{-}\pi^{-}\pi^{-}+p$ with the COMPASS spectrometer at CERN. [...]
arXiv:2504.09470 ; CERN-EP-2025-086.
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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. [...]
CERN-EP-2024-346 ; 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 / COMPASS Collaboration
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 $z$. Data were obtained by the COMPASS Collaboration using a 160 GeV muon beam of both electric charges and a liquid hydrogen target. [...]
arXiv:2410.12005; CERN-EP-2024-270.- 2025-07-01 - 16 p. - Published in : Phys. Rev. D 112 (2025) 012002 Fulltext: 2410.12005 - PDF; document - PDF;
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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;
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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;
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Strange-Meson Spectroscopy with COMPASS / Wallner, S. (Garching, Max Planck Inst.) /COMPASS Collaboration
While the spectrum of non-strange light mesons is well known, many predicted strange mesons have not yet been observed, and many potentially observed states require further confirmation. Using the $K^-$ component of the hadron beam at the M2 beamline at CERN, we study the strange-meson spectrum with the COMPASS experiment. [...]
arXiv:2310.09249.- 2024-07 - 5 p.
- Published in : Nuovo Cimento C: 47 (2024) , no. 4, pp. 149 Fulltext: 2310.09249 - PDF; document - PDF;
In : 20th International Conference on Hadron Spectroscopy and Structure (HADRON 2023), Genova, Italy, 5 - 9 Jun 2023, pp.149
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Strange-Meson Spectroscopy – from COMPASS to AMBER / Wallner, S. (Munich, Max Planck Inst.) /COMPASS Collaboration ; AMBER Collaboration
COMPASS is a multi-purpose fixed-target experiment at CERN's M2 beam line aimed at studying the structure and spectrum of hadrons. It has collected the so far world's largest data set on diffractive production of the $K^-\pi^-\pi^+$ final state, which in principle gives access to all strange mesons. [...]
arXiv:2211.09499.- 2022 - 8 p. - Published in : EPJ Web Conf.: 274 (2022) , pp. 03010
Fulltext: document - PDF; 2211.09499 - PDF;
In : 15th Conference on Quark Confinement and the Hadron Spectrum (Confinement XV), Stavanger, Norway, 1 - 6 Aug 2022, pp.03010
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Transverse-spin-dependent azimuthal asymmetries of pion and kaon pairs produced in muon-proton and muon-deuteron semi-inclusive deep inelastic scattering / COMPASS Collaboration
A set of measurements of azimuthal asymmetries in the production of pairs of identified hadrons in deep-inelastic scattering of muons on transversely polarised 6LiD (deuteron) and NH3 (proton) targets is presented. All available data collected in the years 2002–2004 and 2007/2010 with the COMPASS spectrometer using a muon beam of 160 GeV=c at the CERN SPS were analysed. [...]
arXiv:2301.02013; CERN-EP-2022-292.- Geneva : CERN, 2023-08-29 - 11 p. - Published in : Phys. Lett. B 845 (2023) 138155 Draft (restricted): PDF; Fulltext: 2301.02013 - PDF; CERN-EP-2022-292 - PDF; Publication - PDF;
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Collins and Sivers transverse-spin asymmetries in inclusive muoproduction of $\rho^0$ mesons / COMPASS Collaboration
The production of vector mesons in deep inelastic scattering is an interesting yet scarsely explored channel to study the transverse spin structure of the nucleon and the related phenomena. The COMPASS collaboration has performed the first measurement of the Collins and Sivers asymmetries for inclusively produced $\rho^0$ mesons. [...]
arXiv:2211.00093; CERN-EP-2022-234; CERN-EP-2022--234.- Geneva : CERN, 2023-06-16 - 9 p. - Published in : Phys. Lett. B 843 (2023) 137950 Draft (restricted): PDF; Fulltext: CERN-EP-2022-234_2 - PDF; 2211.00093 - PDF; Publication - PDF;

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Veja também: nomes de autores similares
12 Wallner, S
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