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1.
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Simulations of beam dynamics and beam lifetime for the prototype EDM ring
/ S Siddique (Darmstadt, GSI ; Aachen, Tech. Hochsch.) ; Lehrach, A (Aachen, Tech. Hochsch. ; Julich, Forschungszentrum) ; Pretz, J (Julich, Forschungszentrum) ; Carli, C (CERN)
/JEDI Collaboration ; CPEDM Collaboration
The matter-antimatter asymmetry may be explained through CP-violation by observing a permanent electric dipole moment (EDM) of subatomic particles. An advanced approach to measure the EDM of charged particles is to apply a unique method of "Frozen spin" on a polarized beam in a storage ring. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) TUPM078
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.TUPM078
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2.
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Beam dynamics for concurrent operation of the LHeC and the HL-LHC
/ von Witzleben, T (CERN ; RWTH Aachen U.) ; André, K D J (CERN) ; De Maria, R (CERN) ; Holzer, B (CERN) ; Klein, M (Liverpool U.) ; Pretz, J (RWTH Aachen U. ; Julich, Forschungszentrum) ; Smith, M (Liverpool U.)
The Large Hadron Electron Collider (LHeC) is a study at CERN to construct an energy recovery linear accelerator (ERL) tangentially to the High Luminosity Large Hadron Collider (HL-LHC). This would enable deep inelastic scattering collisions between electrons and protons in the ALICE interaction region (IR2). [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) MOPA054
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPA054
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3.
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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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4.
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CPEDM: A Storage Ring Facility for Charged-Particle EDM Searches
/ Carli, Christian (CERN) ; Paolo, Lenisa (Ferrara U. ; INFN, Ferrara) ; Pretz, Jörg (RWTH Aachen U. ; KIT, Karlsruhe, IKP ; JARA, Aachen) ; Rathmann, Frank (KIT, Karlsruhe, IKP) ; Ströher, Hans (KIT, Karlsruhe, IKP)
Scientific Background: Symmetries and Physics Beyond the Standard Model..
2021 - 3 p.
- Published in : Nucl. Phys. News 31 (2021) 27-29
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5.
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Exotic meson $\pi_1(1600)$ with $J^{PC} = 1^{-+}$ and its decay into $\rho(770)\pi$
/ COMPASS Collaboration
We study the spin-exotic $J^{PC} = 1^{-+}$ amplitude in single-diffractive dissociation of 190 GeV$/c$ pions into $\pi^-\pi^-\pi^+$ using a hydrogen target and confirm the $\pi_1(1600) \to \rho(770) \pi$ amplitude, which interferes with a nonresonant $1^{-+}$ amplitude. We demonstrate that conflicting conclusions from previous studies on these amplitudes can be attributed to different analysis models and different treatment of the dependence of the amplitudes on the squared four-momentum transfer and we thus reconcile their experimental findings. [...]
arXiv:2108.01744; CERN-EP-2021–162.-
2022-01-01 - 30 p.
- Published in : Phys. Rev. D 105 (2022) 012005
Fulltext: 2108.01744 - PDF; PhysRevD.105.012005 - PDF;
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6.
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Probing transversity by measuring $\Lambda$ polarisation in SIDIS
/ Alexeev, M.G. ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. ; Andrieux, V. ; Anosov, V. (Dubna, JINR) ; Augsten, K. ; Augustyniak, W. (NCBJ, Warsaw) ; Azevedo, C.D.R. (Aveiro U.) ; Badełek, B. (Warsaw U.) ; Balestra, F. et al.
/COMPASS
Based on the observation of sizeable target-transverse-spin asymmetries in single-hadron and hadron-pair production in Semi-Inclusive measurements of Deep Inelastic Scattering (SIDIS), the chiral-odd transversity quark distribution functions $h_1^q$ are nowadays well established. Several possible channels to access these functions were originally proposed. [...]
arXiv:2104.13585; CERN-EP-2021-072.-
Geneva : CERN, 2022-01-10 - 18 p.
Draft (restricted): PDF; Fulltext: CERN-EP-2021-072 - PDF; 2104.13585 - PDF;
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7.
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Search for a muon EDM using the frozen-spin technique
/ Adelmann, A. (ETH, Zurich (main) ; PSI, Villigen) ; Backhaus, M. (ETH, Zurich (main)) ; Chavez Barajas, C. (Liverpool U.) ; Berger, N. (Mainz U., Inst. Phys.) ; Bowcock, T. (Liverpool U.) ; Calzolaio, C. (PSI, Villigen) ; Cavoto, G. (Rome U. ; INFN, Rome) ; Chislett, R. (University Coll. London) ; Crivellin, A. (PSI, Villigen ; CERN ; U. Zurich (main)) ; Daum, M. (PSI, Villigen) et al.
This letter of intent proposes an experiment to search for an electric dipole moment of the muon based on the frozen-spin technique. [...]
arXiv:2102.08838.
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28 p.
Fulltext
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8.
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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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9.
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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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10.
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Antiproton over proton and K$^-$ over K$^+$ multiplicity ratios at high $z$ in DIS
/ COMPASS Collaboration
The $\bar{\rm p} $ over p multiplicity ratio is measured in deep-inelastic scattering for the first time using (anti-) protons carrying a large fraction of the virtual-photon energy, $z>0.5$. The data were obtained by the COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar $^6$LiD target. [...]
arXiv:2003.11791; CERN-EP-2020-041.-
Geneva : CERN, 2020-07-02 - 19 p.
- Published in : Phys. Lett. B 807 (2020) 135600
Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2020-041 - PDF; 2003.11791 - PDF; Fulltext from publisher: PDF;
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