ter Wolbeek, J. - Risultato della ricerca

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Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section / COMPASS Collaboration
We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160 GeV/$c$ polarized $\mu^+$ and $\mu^-$ beams of the CERN SPS impinging on a liquid hydrogen target. We determine the dependence of the average of the measured $\mu^+$ and $\mu^-$ cross sections for deeply virtual Compton scattering on the squared four-momentum transfer $t$ from the initial to the final final proton. [...]
arXiv:1802.02739; CERN-EP-2018-016.- Geneva : CERN, 2019-06-10 - 7 p.
Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: 1802.02739 - PDF; CERN-EP-2018-016 - PDF; Fulltext from publisher: PDF;

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Hard exclusive meson production at COMPASS / Ter Wolbeek, Johannes (Freiburg U.) /COMPASS
The concept of Generalized Parton Distributions (GPDs) combines two-dimensional spatial information given by form factors, with longitudinal momentum information from Parton Distribution Functions. GPDs provide comprehensive description of the nucleon structure involving a wealth of new information. [...]
2016 - 7 p. - Published in : Int. J. Mod. Phys. Conf. Ser. 40 (2016) 1660052
In : 21st International Symposium on Spin Physics, Beijing, China, 20 - 24 Oct 2014, pp.1660052

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Longitudinal double-spin asymmetry $A_1^{\rm p}$ and spin-dependent structure function $g_1^{\rm p}$ of the proton at small values of $x$ and $Q^2$ / COMPASS Collaboration
We present a precise measurement of the proton longitudinal double-spin asymmetry $A_1^{\rm p}$ and the proton spin-dependent structure function $g_1^{\rm p}$ at photon virtualities $0.006~({\rm GeV}/c)^2<Q^2 < 1~({\rm GeV}/c)^2$ in the Bjorken $x$ range of $4 \times 10^{-5} < x < 4 \times 10^{-2}$. The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energies of $160~{\rm GeV}$ and $200~{\rm GeV}$. [...]
arXiv:1710.01014; CERN-EP-2017-263.- Geneva : CERN, 2018-06-10 - 9 p. Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2017-263 - PDF; arXiv:1710.01014 - PDF;

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Transverse-momentum-dependent Multiplicities of Charged Hadrons in Muon-Deuteron Deep Inelastic Scattering / COMPASS Collaboration
A semi-inclusive measurement of charged hadron multiplicities in deep inelastic muon scattering off an isoscalar target was performed using data collected by the COMPASS Collaboration at CERN. The following kinematic domain is covered by the data: photon virtuality $Q^{2}>1$ (GeV/$c$)$^2$, invariant mass of the hadronic system $W > 5$ GeV/$c^2$, Bjorken scaling variable in the range $0.003 < x < 0.4$, fraction of the virtual photon energy carried by the hadron in the range $0.2 < z < 0.8$, square of the hadron transverse momentum with respect to the virtual photon direction in the range 0.02 (GeV/$c)^2 < P_{\rm{hT}}^{2} < 3$ (GeV/$c$)$^2$. [...]
arXiv:1709.07374; CERN-EP-2017-253.- Geneva : CERN, 2018-02-08 - 23 p. - Published in : Phys. Rev. D 97 (2018) 032006 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: arXiv:1709.07374 - PDF; CERN-EP-2017-253 - PDF;

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New analysis of $\eta\pi$ tensor resonances measured at the COMPASS experiment / JPAC Collaboration
We present a new amplitude analysis of the $\eta\pi$ $D$-wave in $\pi^- p\to \eta\pi^- p$ measured by COMPASS. Employing an analytical model based on the principles of the relativistic $S$-matrix, we find two resonances that can be identified with the $a_2(1320)$ and the excited $a_2^\prime(1700)$, and perform a comprehensive analysis of their pole positions. [...]
arXiv:1707.02848; CERN-EP-2017-169; JLAB-THY-17-2468.- Geneva : CERN, 2018-04-10 - 9 p. - Published in : Phys. Lett. B 779 (2018) 464-472 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: arXiv:1707.02848 - PDF; CERN-EP-2017-169 - PDF;

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Search for muoproduction of $X (3872)$ at COMPASS and indication of a new state $\widetilde{X}(3872)$ / COMPASS Collaboration
We have observed exclusive production of the exotic $X(3872)$ hadron in the reaction $\mu^+~N \rightarrow \mu^+ (J\!/\!\psi\pi^+\pi^-)\pi^{\pm}~N'$ using COMPASS data collected with incoming muons of 160~GeV/$c$ and 200~GeV/$c$ momentum. The statistical significance of the $X(3872)$ signal is 6$\sigma$. [...]
arXiv:1707.01796; CERN-EP-2017-165.- Geneva : CERN, 2018-08-10 - 7 p. - Published in : Phys. Lett. B 783 (2018) 334-340 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2017-165 - PDF; SCOAP3 Fulltext - PDF; arXiv:1707.01796 - PDF;

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First measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process / COMPASS Collaboration
The first measurement of transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan (DY) process is reported. We use the CERN SPS 190 GeV/$c$, $\pi^{-}$ beam and a transversely polarized ammonia target. [...]
arXiv:1704.00488; CERN-EP-2017-059.- Geneva : CERN, 2017-09-12 - 7 p. - Published in : Phys. Rev. Lett. 119 (2017) 112002 Draft (restricted): PDF; Fulltext: CERN-EP-2017-059 - PDF; arXiv:1704.00488 - PDF; 10.1103_PhysRevLett.119.112002 - PDF;

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First measurement of the Sivers asymmetry for gluons from SIDIS data / COMPASS Collaboration
The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. It was extracted from measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it turned out to be non-zero for quarks. [...]
arXiv:1701.02453; CERN-EP-2017-003.- Geneva : CERN, 2017-09-10 - 11 p. - Published in : Phys. Lett. B 772 (2017) 854-864 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2017-003 - PDF; arXiv:1701.02453 - PDF;

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Sivers asymmetry extracted in SIDIS at the hard scales of the Drell–Yan process at COMPASS / COMPASS Collaboration
Proton transverse-spin azimuthal asymmetries are extracted from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon-nucleon scattering in those four regions of the photon virtuality $Q^2$, which correspond to the four regions of the di-muon mass $\sqrt{Q^2}$ used in the ongoing analysis of the COMPASS Drell-Yan measurements. This allows for a future direct comparison of the nucleon transverse-momentum-dependent parton distribution functions extracted from these two alternative measurements. [...]
arXiv:1609.07374; CERN-EP-2016-250; CERN-EP-2016--250.- Geneva : CERN, 2017-07-10 - 8 p. - Published in : Phys. Lett. B 770 (2017) 138-145 Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint

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10.

Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons / Adolph, C. (U. Erlangen-Nuremberg (main)) ; Aghasyan, M (INFN, Trieste) ; Akhunzyanov, R (Dubna, JINR) ; Alexeev, M G (Turin U.) ; Alexeev, G D (Dubna, JINR) ; Amoroso, A (INFN, Turin ; Turin U.) ; Andrieux, V (IRFU, Saclay) ; Anfimov, N V (Dubna, JINR) ; Anosov, V (Dubna, JINR) ; Augsten, K (CTU, Prague ; Dubna, JINR) et al.
Single hadron azimuthal asymmetries of positive and negative hadrons produced in muon semi-inclusive deep inelastic scattering off longitudinally polarised deuterons are determined using the 2006 COMPASS data and also combined all deuteron COMPASS data. For each hadron charge, the dependence of the azimuthal asymmetry on the hadron azimuthal angle $\phi$ is obtained by means of a five-parameter fitting function that besides a $\phi$-independent term includes four modulations predicted by theory: $\sin\phi$, $\sin 2 \phi$, $\sin 3\phi$ and $\cos\phi$. [...]
arXiv:1609.06062; CERN-EP-2016-245.- Geneva : CERN, 2018-11-19 - 15 p. - Published in : Eur. Phys. J. C Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint

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