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1.
Search for muoproduction of X(3872) at COMPASS and indication of a new state ˜X(3872) / COMPASS Collaboration
We have observed exclusive production of the exotic X(3872) hadron in the reaction μ+ Nμ+(J/ψπ+π)π± 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 6σ. [...]
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;
2.
Longitudinal double-spin asymmetry Ap1 and spin-dependent structure function gp1 of the proton at small values of x and Q2 / COMPASS Collaboration
We present a precise measurement of the proton longitudinal double-spin asymmetry Ap1 and the proton spin-dependent structure function gp1 at photon virtualities 0.006 (GeV/c)2<Q2<1 (GeV/c)2 in the Bjorken x range of 4×105<x<4×102. The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energies of 160 GeV and 200 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;
3.
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 6LiD 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;
4.
Measurement of PT-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 PT, 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;
5.
New analysis of ηπ tensor resonances measured at the COMPASS experiment / JPAC Collaboration
We present a new amplitude analysis of the ηπ D-wave in πpηπp 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 a2(1320) and the excited a2(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;
6.
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 μ+ and μ beams of the CERN SPS impinging on a liquid hydrogen target. We determine the dependence of the average of the measured μ+ and μ 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;
7.
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 Q2>1 (GeV/c)2, invariant mass of the hadronic system W>5 GeV/c2, 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<P2hT<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;
8.
Spin Density Matrix Elements in Exclusive ω Meson Muoproduction / COMPASS Collaboration
We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive ω meson muoproduction on the proton at COMPASS using 160 GeV/c polarised μ+ and μ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/c2 <W< 17.0 GeV/c2, with the average kinematics Q2= 2.1 (GeV/c)2, W=7.6 GeV/c2, and p2T=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;
9.
Measurement of the cross section for hard exclusive π0 leptoproduction / COMPASS Collaboration
We report on a measurement of hard exclusive π0 muoproduction on the proton by COMPASS using 160 GeV/c polarised μ+ and μ beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured μ+ and μ 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(GeV/c)2<|t|<0.64(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;
10.
A New QCD facility at the M2 beam line of the CERN SPS: COMPASS++/AMBER / Adams, B. (Chicago U., EFI ; Xonics Inc.) ; Aidala, C.A. (Michigan U.) ; Akhunzyanov, R. (Dubna, JINR) ; Alexeev, G.D. (Dubna, JINR) ; Alexeev, M.G. (Turin U.) ; Amoroso, A. (Turin U. ; INFN, Turin) ; Andrieux, V. (Illinois U., Urbana) ; Anfimov, N.V. (Dubna, JINR) ; Anosov, V. (Dubna, JINR) ; Antoshkin, A. (Dubna, JINR) et al.
In this Letter of Intent, we propose a broad experimental programme for the ``New QCD facility at the M2 beam line of the CERN SPS''. [...]
arXiv:1808.00848 ; CERN-SPSC-2019-003 ; SPSC-I-250 ; SPSC-I-250.
- 2019. - 91 p.
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