CERN Accelerating science

CERN Document Server Sök i 58 journaler efter:  1 - 10nästaslut  gå till journal: Sökningen tog 1.43 sekunder. 
1.
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
2.
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
3.
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;
4.
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
5.
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
6.
Spin alignment and violation of the OZI rule in exclusive $\omega$ and $\phi$ production in pp collisions / COMPASS collaboration
Exclusive production of the isoscalar vector mesons $\omega$ and $\phi$ is measured with a 190 GeV$/c$ proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable $x_{F}$ of the fast proton. [...]
arXiv:1405.6376; CERN-PH-EP-2014-096; CERN-PH-EP-2014-096.- Geneva : CERN, 2014-09 - 24 p. - Published in : Nucl. Phys. B 886 (2014) 1078-1101 Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: CERN-PH-EP-2014-096 - PDF; S0550321314002399 - XML; arXiv:1405.6376 - PDF;
7.
Measurement of radiative widths of $a_2(1320)$ and $\pi_2(1670)$ / COMPASS Collaboration
The COMPASS Collaboration at CERN has investigated the reaction $\pi^- \gamma \rightarrow \pi^-\pi^-\pi^+$ embedded in the Primakoff reaction of $190~\textrm{GeV}$ pions scattering in the Coulomb field of a lead target, $\pi^- \text{Pb} \rightarrow \pi^-\pi^-\pi^+ \text{Pb}$. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at momentum transfer below $0.001~(\text{GeV}/c)^2$. [...]
arXiv:1403.2644; CERN-PH-EP-2014-041; CERN-PH-EP-2014-041.- Geneva : CERN, 2014 - 19 p. - Published in : Eur. Phys. J. A 50 (2014) 79 Draft (restricted): PDF; Fulltext: CERN-PH-EP-2014-041 - PDF; arXiv:1403.2644 - PDF; External link: Preprint
8.
A high-statistics measurement of transverse spin effects in dihadron production from muon-proton semi-inclusive deep-inelastic scattering / COMPASS Collaboration
A measurement of the azimuthal asymmetry in dihadron production in deep-inelastic scattering of muons on transversely polarised proton (NH$_{3}$) targets are presented. They provide independent access to the transversity distribution functions through the measurement of the Collins asymmetry in single hadron production. [...]
arXiv:1401.7873; CERN-PH-EP-2014-013; CERN-PH-EP-2014-013.- Geneva : CERN, 2014-09-07 - 8 p. - Published in : Phys. Lett. B 736 (2014) 124-131 Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: arXiv:1401.7873 - PDF; S0370269314004857 - XML; CERN-PH-EP-2014-013 - PDF;
9.
Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons / COMPASS Collaboration
Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS muon beam at $160$ GeV/c and a $^6$LiD target. The amplitudes of the three azimuthal modulations $\cos\phi_h$, $\cos2\phi_h$ and $\sin\phi_h$ were obtained binning the data separately in each of the relevant kinematic variables $x$, $z$ or $p_T^{\,h}$ and binning in a three-dimensional grid of these three variables. [...]
arXiv:1401.6284; CERN-PH-EP-2014-009; CERN-PH-EP-2014-009.- Geneva : CERN, 2014-09 - 32 p. - Published in : Nucl. Phys. B 886 (2014) 1046-1077 Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: S0550321314002387 - XML; CERN-PH-EP-2014-009 - PDF; arXiv:1401.6284 - PDF;
10.
Transverse target spin asymmetries in exclusive $\rho^0$ muoproduction / COMPASS Collaboration
Exclusive production of $\rho^0$ mesons was studied at the COMPASS experiment by scattering 160 GeV/$c$ muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured as a function of $Q^2$, $x_{Bj}$, or $p_{T}^{2}$. [...]
arXiv:1310.1454; CERN-PH-EP-2013-191; CERN-PH-EP-2013-191.- Geneva : CERN, 2014-04-04 - 8 p. - Published in : Phys. Lett. B 731 (2014) 19-26 Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: S0370269314000963 - XML; arXiv:1310.1454 - PDF; CERN-PH-EP-2013-191 - PDF;

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