CERN Accelerating science

CERN Document Server 19 ჩანაწერია ნაპოვნი  1 - 10შემდეგი  ჩანაწერთან გადასვლა: ძიებას დასჭირდა 0.74 წამი. 
1.
Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high $p_T$ / COMPASS Collaboration
We measured the longitudinal double spin asymmetries $A_{LL}$ for single hadron muo-production off protons and deuterons at photon virtuality $Q^2$ < 1(GeV/$\it c$)$^2$ for transverse hadron momenta $p_T$ in the range 0.7 GeV/$\it c$ to 4 GeV/$\it c$ . They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/$\it c$ or 200 GeV/$\it c$ impinging on polarised $\mathrm{{}^6LiD}$ or $\mathrm{NH_3}$ targets. [...]
arXiv:1509.03526; CERN-PH-EP-2015-245.- Geneva : CERN, 2016-02-10 - 7 p. - Published in : Phys. Lett. B 753 (2016) 573-579 Article from SCOAP3: PDF; Fulltext: PDF; Preprint: PDF; External link: Preprint
2.
Resonance Production and $\pi\pi$ S-wave in $\pi^- + p \rightarrow \pi^- \pi^- \pi^+ + p_{recoil}$ at 190 GeV/c / COMPASS collaboration
The COMPASS collaboration has collected the currently largest data set on diffractively produced $\pi^-\pi^-\pi^+$ final states using a negative pion beam of 190 GeV/c momentum impinging on a stationary proton target. This data set allows for a systematic partial-wave analysis in 100 bins of three-pion mass, $0.5 < m_{3\pi} < 2.5$ GeV/c$^2$ , and in 11 bins of the reduced four-momentum transfer squared, $0.1 < t < 1.0$ (GeV/c)$^2$ . [...]
arXiv:1509.00992; CERN-PH-EP-2015-233.- Geneva : CERN, 2017-02-16 - 59 p. - Published in : Phys. Rev. D 95 (2017) 032004 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: arXiv:1509.00992 - PDF; 10.1103_PhysRevD.95.032004 - PDF; External link: Preprint
3.
Interplay among transversity induced asymmetries in hadron leptoproduction / COMPASS Collaboration
In the fragmentation of a transversely polarized quark several left-right asymmetries are possible for the hadrons in the jet. When only one unpolarized hadron is selected, it exhibits an azimuthal modulation known as Collins effect. [...]
arXiv:1507.07593; CERN-PH-EP-2015-199; CERN-PH-EP-2015-199.- Geneva : CERN, 2016-02-10 - 6 p. - Published in : Phys. Lett. B 753 (2016) 406-411 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint
4.
The Spin Structure Function $g_1^{\rm p}$ of the Proton and a Test of the Bjorken Sum Rule / COMPASS Collaboration
New results for the double spin asymmetry $A_1^{\rm p}$ and the proton longitudinal spin structure function $g_1^{\rm p}$ are presented. They were obtained by the COMPASS collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH$_3$ target. [...]
arXiv:1503.08935; CERN-PH-EP-2015-085; CERN-PH-EP-2015-085.- Geneva : CERN, 2016-02-10 - 11 p. - Published in : Phys. Lett. B 753 (2016) 18-28 Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: arXiv:1503.08935 - PDF; CERN-PH-EP-2015-085 - PDF; External link: Preprint
5.
Observation of a new narrow axial-vector meson $a_1(1420)$ / COMPASS collaboration
The COMPASS collaboration at CERN has measured diffractive dissociation of 190 GeV$/c$ pions into the $\pi^-\pi^-\pi^+$ final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins of $3\pi$ mass and four-momentum transfer using the isobar model and the so far largest PWA model consisting of 88~waves. [...]
arXiv:1501.05732; CERN-PH-EP-2015-015; CERN-PH-EP-2015-015.- Geneva : CERN, 2015-08-19 - 6 p. - Published in : Phys. Rev. Lett. 115 (2015) 082001 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: CERN-PH-EP-2015-015 - PDF; arXiv:1501.05732 - PDF; External link: Preprint
6.
The COMPASS Setup for Physics with Hadron Beams / COMPASS Collaboration
The main characteristics of the COMPASS experimental setup for physics with hadron beams are described. This setup was designed to perform exclusive measurements of processes with several charged and/or neutral particles in the final state. [...]
arXiv:1410.1797; CERN-PH-EP-2014-247; CERN-PH-EP-2014-247.- Geneva : CERN, 2015-04-11 - 47 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 779 (2015) 69-115 Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: arXiv:1410.1797 - PDF; CERN-PH-EP-2014-247 - PDF; External link: Preprint
7.
Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised proton / COMPASS collaboration
Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. [...]
arXiv:1408.4405; CERN-PH-EP-2014-213; CERN-PH-EP-2014-213.- Geneva : CERN, 2015-03-31 - 10 p. - Published in : Phys. Lett. B 744 (2015) 250-259 Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: CERN-PH-EP-2014-213 - PDF; arXiv:1408.4405 - PDF; External link: Preprint
8.
Odd and Even Partial Waves of $\eta\pi^-$ and $\eta'\pi^-$ in $\pi^-p\to\eta^{(\prime)}\pi^-p$ at $191\,\textrm{GeV}/c$ / COMPASS Collaboration
Exclusive production of $\eta\pi^-$ and $\eta'\pi^-$ has been studied with a $191\,\textrm{GeV}/c$ $\pi^-$ beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum ($L$) characteristics in the inspected invariant mass range up to $3\,\textrm{GeV}/c^2$. [...]
arXiv:1408.4286; CERN-PH-EP-2014-204; CERN-PH-EP-2014-204.- Geneva : CERN, 2014-11-30 - 9 p. Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: CERN-PH-EP-2014-204 - PDF; S0370269314008685 - XML; arXiv:1408.4286 - PDF;
9.
Search for exclusive photoproduction of Z$_c^{\pm}$(3900) at COMPASS / COMPASS Collaboration
A search for the exclusive production of the $Z_c^{\pm}(3900)$ hadron by virtual photons has been performed in the channel $Z_c^{\pm}(3900)\rightarrow J/\psi \pi^{\pm}$. The data cover the range from 7~GeV to 19~GeV in the centre-of-mass energy of the photon-nucleon system. [...]
arXiv:1407.6186; CERN-PH-EP-2014-180; CERN-PH-EP-2014-180.- Geneva : CERN, 2015-03-06 - 5 p. - Published in : Phys. Lett. B 742 (2015) 330-334 Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: arXiv:1407.6186 - PDF; CERN-PH-EP-2014-180 - PDF; External link: Preprint
10.
Measurement of the Charged-Pion Polarizability / COMPASS Collaboration
The COMPASS collaboration at CERN has investigated pion Compton scattering, $\pi^-\gamma\rightarrow \pi^-\gamma$, at centre-of-mass energy below 3.5 pion masses. The process is embedded in the reaction $\pi^-\mathrm{Ni}\rightarrow\pi^-\gamma\;\mathrm{Ni}$, which is initiated by 190 GeV pions impinging on a nickel target. [...]
arXiv:1405.6377; CERN-PH-EP-2014-109; CERN-PH-EP-2014-109.- Geneva : CERN, 2015-02-10 - 6 p. - Published in : Phys. Rev. Lett. 114 (2015) 062002 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: arXiv:1405.6377 - PDF; CERN-PH-EP-2014-109 - PDF; External link: Interactions.org article

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