CERN Accelerating science

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1.
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.
Full text - Fulltext
2.
Light isovector resonances in $\pi^- p \to \pi^-\pi^-\pi^+ p$ at 190 GeV/${\it c}$ / COMPASS Collaboration
We have performed the most comprehensive resonance-model fit of $\pi^-\pi^-\pi^+$ states using the results of our previously published partial-wave analysis (PWA) of a large data set of diffractive-dissociation events from the reaction $\pi^- + p \to \pi^-\pi^-\pi^+ + p_\text{recoil}$ with a 190 GeV/$c$ pion beam. The PWA results, which were obtained in 100 bins of three-pion mass, $0.5 < m_{3\pi} < 2.5$ GeV/$c^2$, and simultaneously in 11 bins of the reduced four-momentum transfer squared, $0.1 < t' < 1.0$ $($GeV$/c)^2$, are subjected to a resonance-model fit using Breit-Wigner amplitudes to simultaneously describe a subset of 14 selected waves using 11 isovector light-meson states with $J^{PC} = 0^{-+}$, $1^{++}$, $2^{++}$, $2^{-+}$, $4^{++}$, and spin-exotic $1^{-+}$ quantum numbers. [...]
arXiv:1802.05913; CERN-EP-2018-021.- Geneva : CERN, 2018-11-02 - 72 p. - Published in : Phys. Rev. D 98 (2018) 092003 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2018-021 - PDF; 1802.05913 - PDF;
3.
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;
4.
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;
5.
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;
6.
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;
7.
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;
8.
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;
9.
Final COMPASS results on the deuteron spin-dependent structure function $g_1^{\rm d}$ and the Bjorken sum rule / COMPASS Collaboration
Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a $^6$LiD target. The data were taken at $160~{\rm GeV}$ beam energy and the results are shown for the kinematic range $1~({\rm GeV}/c)^2 < Q^2 < 100~({\rm GeV}/c)^2$ in photon virtuality, $0.004 4~{\rm GeV}/c^2$ in the mass of the hadronic final state. [...]
arXiv:1612.00620; CERN-EP-2016-299.- Geneva : CERN, 2017-06-10 - 8 p. - Published in : Phys. Lett. B 769 (2017) 34-41 Article from SCOAP3: PDF; Fulltext: PDF;
10.
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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