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1.
High purity 100 GeV electron identification with synchrotron radiation / Depero, E. (Zurich, ETH) ; Banerjee, D. (Zurich, ETH) ; Burtsev, V. (Tomsk Polytechnic U.) ; Chumakov, A. (Tomsk Polytechnic U.) ; Cooke, D. (Zurich, ETH) ; Dermenev, A.V. (Moscow, INR) ; Donskov, S.V. (Serpukhov, IHEP) ; Dubinin, F. (Lebedev Inst.) ; Dusaev, R.R. (Tomsk Polytechnic U.) ; Emmenegger, S. (Zurich, ETH) et al.
In high energy experiments such as active beam dump searches for rare decays and missing energy events, the beam purity is a crucial parameter. In this paper we present a technique to reject heavy charged particle contamination in the 100 GeV electron beam of the H4 beam line at CERN SPS. [...]
arXiv:1703.05993.- 2017-09-11 - 6 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 866 (2017) 196-201 Fulltext: 10.1016_j.nima.2017.05.028 - PDF; arXiv:1703.05993 - PDF; 1-s2.0-S0168900217305727-main - PDF;
2.
Constraints on New Physics in the Electron g-2 from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector / NA64 Collaboration
We performed a search for a new generic X boson, which could be a scalar (S), pseudoscalar (P), vector (V) or an axial vector (A) particle produced in the 100 GeV electron scattering off nuclei, eZeZX, followed by its invisible decay in the NA64 experiment at CERN. No evidence for such process was found in the full NA64 data set of 2.84×1011 electrons on target. [...]
arXiv:2102.01885; CERN-EP-2021-017.- 2021-05-26 - 6 p. - Published in : Phys. Rev. Lett. 126 (2021) 21 Article from SCOAP3: PDF; Fulltext: PDF;
3.
Search for pseudoscalar bosons decaying into e+e- pairs in the NA64 experiment at the CERN SPS / NA64 Collaboration
We report the results of a search for a light pseudoscalar particle a that couples to electrons and decays to e+e performed using the high-energy CERN SPS H4 electron beam. If such pseudoscalar with a mass 17 MeV exists, it could explain the ATOMKI anomaly. [...]
arXiv:2104.13342.- 2021-12-01 - 5 p. - Published in : Phys. Rev. D 104 (2021) L111102 Fulltext: 2104.13342 - PDF; PhysRevD.104.L111102 (1) - PDF; PhysRevD.104.L111102 - PDF;
4.
Probing transversity by measuring Λ 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 hq1 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;
5.
Search for invisible decays of sub-GeV dark photons in missing-energy events at the CERN SPS / NA64 Collaboration
We report on a direct search for sub-GeV dark photons (A') which might be produced in the reaction e^- Z \to e^- Z A' via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS. The A's would decay invisibly into dark matter particles resulting in events with large missing energy. [...]
arXiv:1610.02988.- 2017-01-05 - 6 p. - Published in : Phys. Rev. Lett. 118 (2017) 011802 Fulltext: 10.1103_PhysRevLett.118.011802 - PDF; arXiv:1610.02988 - PDF; External link: Preprint
6.
Measurement of the π0 electromagnetic transition form factor slope / NA62 Collaboration
The NA62 experiment collected a large sample of charged kaon decays in 2007 with a highly efficient trigger for decays into electrons. A measurement of the π0 electromagnetic transition form factor slope parameter from 1.11×106 fully reconstructed K±π±π0D,π0De+eγ events is reported. [...]
arXiv:1612.08162; CERN-EP-2016-323.- Geneva : CERN, 2017-05-10 - 8 p. - Published in : Phys. Lett. B 768 (2017) 38-45 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2016-323 - PDF; arXiv:1612.08162 - 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, π 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.
CERN Yellow Report Front Cover Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector / de Florian, D.
This Report summarizes the results of the activities of the LHC Higgs Cross Section Working Group in the period 2014-2016 [...]
arXiv:1610.07922 ; CERN-2017-002-M ; CERN-2017-002 - Geneva : CERN, 2017. - 849 p. (CERN Yellow Reports: Monographs ; 2/2017)


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9.
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;
10.
Dark Sectors 2016 Workshop: Community Report / Alexander, Jim (Cornell U., Phys. Dept.) ; Battaglieri, Marco (INFN, Genoa) ; Echenard, Bertrand (Caltech) ; Essig, Rouven (SUNY, Stony Brook) ; Graham, Matthew (SLAC) ; Izaguirre, Eder (Perimeter Inst. Theor. Phys.) ; Jaros, John (SLAC) ; Krnjaic, Gordan (Fermilab) ; Mardon, Jeremy (Stanford U., Phys. Dept.) ; Morrissey, David (TRIUMF) et al.
This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years..
arXiv:1608.08632 ; FERMILAB-CONF-16-421.
- 2016. - 66 p.
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