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CERN Document Server 2,046 záznamov nájdených  1 - 10ďalšíkoniec  skoč na záznam: Hľadanie trvalo 1.48 sekúnd. 
1.
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Spin Density Matrix Elements in Exclusive $\omega$ Meson Muoproduction $^*$ / COMPASS Collaboration
We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $\omega$ meson muoproduction on the proton at COMPASS using 160 GeV/$c$ polarised $ \mu ^{+}$ and $ \mu ^{-}$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$c^2$ $< W <$ 17.0 GeV/$c^2$, with the average kinematics $\langle Q^{2} \rangle=$ 2.1 (GeV/$c$)$^2$, $\langle W \rangle= 7.6$ GeV/$c^2$, and $\langle p^{2}_{\rm T} \rangle = 0.16$ (GeV/$c$)$^2$. [...]
arXiv:2009.03271; CERN-EP-2020-169.- Geneva : CERN, 2021-02-05 - 22 p. - Published in : Eur. Phys. J. C 81 (2021) 126 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: 2009.03271 - PDF; CERN-EP-2020-169 - PDF;
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Status of COMPASS RICH-1 Upgrade with MPGD-based Photon Detectors / Tessarotto, F. (INFN, Trieste) ; Alexeev, M. (INFN, Turin) ; Birsa, R. (INFN, Trieste) ; Bradamante, F. (INFN, Trieste ; U. Trieste (main)) ; Bressan, A. (INFN, Trieste ; U. Trieste (main)) ; Chiosso, M. (INFN, Turin ; U. Turin (main)) ; Ciliberti, P. (INFN, Trieste ; U. Trieste (main)) ; Dalla Torre, S. (INFN, Trieste) ; Dasgupta, S. (INFN, Trieste ; U. Trieste (main)) ; Denisov, O. (INFN, Turin) et al.
A Set of new MPGD-based Photon Detectors is being built for the upgrade of COMPASS RICH-1. The detectors cover a total active area of 1.4 m$^2$ and are based on a hybrid architecture consisting of two THGEM layers and a Micromegas. [...]
arXiv:1710.09274.- 2018 - 5 p. - Published in : EPJ Web Conf. 174 (2018) 01004 Fulltext: epjconf_mpgd2018_01004 - PDF; arXiv:1710.09274 - PDF; External links: 00003 Rate of discharges in THGEMs as function of the bias voltage in Ar/CO$_2$ 70/30 gas mixture.; 00000 Artistic view of the COMPASS RICH-1 detector (left) and exploded view of the new PDs (right); 00002 Schematic section of the hybrid module (not in scale).; 00004 A THGEM in its handling frame (left) and inside the CsI deposition plant (right).; 00005 A THGEM in its handling frame (left) and inside the CsI deposition plant (right).; 00001 Artistic view of the COMPASS RICH-1 detector (left) and exploded view of the new PDs (right)
In : 4th International Conference on Micro Pattern Gaseous Detectors - MPGD2015, Trieste, Italy, 12 - 15 Oct 2015, pp.01004
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3.
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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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4.
(80)
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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5.
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K$^{-}$ over K$^{+}$ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy / COMPASS Collaboration
The K$^{-}$ over K$^{+}$ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction $z$ of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and an isoscalar $^6$LiD target. [...]
arXiv:1802.00584; CERN-EP-2018-012.- Geneva : CERN, 2018-11-10 - 9 p. - Published in : Phys. Lett. B 786 (2018) 390-398 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2018-012 - PDF; 1802.00584 - PDF; arXiv:1802.00584 - PDF;
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6.
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Measurement of $P_T$-weighted Sivers asymmetries in leptoproduction of hadrons / COMPASS Collaboration
The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum $P_T$, allow for the extraction of important transverse-momentum-dependent distribution functions. In particular, the weighted Sivers asymmetries provide direct information on the Sivers function, which is a leading-twist distribution that arises from a correlation between the transverse momentum of an unpolarised quark in a transversely polarised nucleon and the spin of the nucleon. [...]
arXiv:1809.02936; CERN-EP-2018-242.- Geneva : CERN, 2019-03 - 20 p. - Published in : Nucl. Phys. B 940 (2019) 34-53 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2018-242 - PDF; 1809.02936 - PDF;
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7.
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Measurement of the cross section for hard exclusive $\pi^0$ leptoproduction / COMPASS Collaboration
We report on a measurement of hard exclusive $\pi^0$ muoproduction on the proton by COMPASS using 160 GeV/$c$ polarised $\mu^+$ and $\mu^-$ beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured $\mu^+$ and $\mu^-$ cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range $0.08\,(\text{GeV/}c)^2 < |t| < 0.64\,(\text{GeV/}c)^2$. [...]
arXiv:1903.12030; CERN-EP-2019-049.- 2020-06-10 - 9 p. - Published in : Phys. Lett. B 805 (2020) 135454 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from publisher: PDF;
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The MPGD-Based Photon Detectors for the upgrade of COMPASS RICH-1 and beyond / Agarwala, J. (INFN, Trieste) ; Alexeev, M. (INFN, Turin) ; Azevedo, C.D.R. (Aveiro U.) ; Bradamante, F. (INFN, Trieste ; Trieste U.) ; Bressan, A. (INFN, Trieste ; Trieste U.) ; Büchele, M. (Freiburg U.) ; Chiosso, M. (INFN, Turin ; Turin U.) ; Chatterjee, C. (INFN, Trieste ; Trieste U.) ; Cicuttin, A. (INFN, Trieste) ; Ciliberti, P. (INFN, Trieste ; Trieste U.) et al.
After pioneering gaseous detectors of single photon for RICH applications using CsI solid state photocathodes in MWPCs within the RD26 collaboration and by the constructions for the RICH detector of the COMPASS experiment at CERN SPS, in 2016 we have upgraded COMPASS RICH by novel gaseous photon detectors based on MPGD technology. Four novel photon detectors, covering a total active area of 1.5~m$^2$, have been installed in order to cope with the challenging efficiency and stability requirements of the COMPASS physics programme. [...]
arXiv:1807.00816.- 2019-08-21 - 4 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 936 (2019) 416-419 Fulltext: PDF;
In : Frontier Detectors for Frontier Physics: XIV Pisa Meeting on Advanced Detectors, La Biodola, Isola D'elba, Italy, 27 May - 2 Jun 2018, pp.416-419
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9.
(72)
Double J/ψ production in pion-nucleon scattering at COMPASS / COMPASS Collaboration
We present the study of the production of double $J/\psi$ mesons using COMPASS data collected with a 190 $\GeV/c$ $\pi^-$ beam scattering off NH$_{3}$, Al and W targets. Kinematic distributions of the collected double $J/\psi$ events are analysed, and the double $J/\psi$ production cross section is estimated for each of the COMPASS targets. [...]
arXiv:2204.01817; CERN-EP-2022-073.- Geneva : CERN, 2023-03-10 - 8 p. - Published in : Phys. Lett. B 838 (2023) 137702 Fulltext: Publication - PDF; CERN-EP-DRAFT-COMPASS-2022-001 - PDF; 2204.01817 - PDF;
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10.
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A Triangle Singularity as the Origin of the $a_1(1420)$ / Alexeev, G.D. (Dubna, JINR) ; Alexeev, M.G. (Turin U. ; INFN, Turin) ; Amoroso, A. (Turin U. ; INFN, Turin) ; Andrieux, V. (CERN ; Illinois U., Urbana) ; Anosov, V. (Dubna, JINR) ; Antoshkin, A. (Dubna, JINR) ; Augsten, K. (Dubna, JINR ; CTU, Prague) ; Augustyniak, W. (NCBJ, Warsaw) ; Azevedo, C.D.R. (Aveiro U.) ; Badełek, B. (Warsaw U.) et al.
The COMPASS experiment recently discovered a new isovector resonance-like signal with axial-vector quantum numbers, the $a_1(1420)$, decaying to $f_0(980)\pi$. With a mass too close to and a width smaller than the axial-vector ground state $a_1(1260)$, it was immediately interpreted as a new light exotic meson, similar to the $X$, $Y$, $Z$ states in the hidden-charm sector. [...]
arXiv:2006.05342; CERN-EP-2020-104.- Geneva : CERN, 2021-08-18 - 21 p. - Published in : Phys. Rev. Lett. Draft (restricted): PDF; Fulltext: CERN-EP-2020-104 - PDF; 2006.05342 - PDF;
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