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The large COMPASS polarized solid ammonia target for Drell–Yan measurements with a pion beam
/ Andrieux, V (Illinois U., Urbana (main)) ; Berlin, A (Ruhr U., Bochum) ; Doshita, N (Yamagata U.) ; Finger, M (Charles U.) ; Finger, M , Jr (Charles U.) ; Gautheron, F (Ruhr U., Bochum ; Illinois U., Urbana (main)) ; Horikawa, N (Chubu U.) ; Ishimoto, S (KEK, Tsukuba) ; Iwata, T (Yamagata U.) ; Kisselev, Y (Dubna, JINR) et al.
The transversely polarized target (PT) of the COMPASS (NA58) collaboration at CERN has been used for Drell–Yan measurements in 2015 and 2018. The transverse spin structure of the proton has been studied using a negative pion beam and a solid ammonia target. [...]
2022 - 10 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1025 (2022) 166069
Fulltext: PDF;
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Large COMPASS polarized solid state target for Drell-Yan physics
/ Koivuniemi, Jaakko Henrik (Ruhr U., Bochum (main)) ; Berlin, Alexander (Ruhr U., Bochum (main)) ; Gautheron, Fabrice (Ruhr U., Bochum (main)) ; Meyer, Werner (Ruhr U., Bochum (main)) ; Reicherz, Gerhard (Ruhr U., Bochum (main)) ; Doshita, Norihiro (Yamagata U.) ; Iwata, Takahiro (Yamagata U.) ; Kondo, Kaori (Yamagata U.) ; Nukazuka, Genki (Yamagata U.) ; Matousek, Jan (Charles U.) et al.
SISSA, 2015 - 7 p.
- Published in : PoS PSTP2015 (2015) 015
Published version from PoS: PDF; External link: PoS server
In : 16th International Workshop on Polarized Sources, Targets, and Polarimetry (PSTP 2015), Bochum, Germany, 14 - 18 Sep 2015, pp.015
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NMR signal analysis in the large COMPASS $^{14}$NH$_{3}$ target
/ Koivuniemi, J (Ruhr U., Bochum) ; Gautheron, F (Ruhr U., Bochum) ; Hess, C (Ruhr U., Bochum) ; Kisselev, Y U (Ruhr U., Bochum) ; Meyer, W (Ruhr U., Bochum) ; Radtke, E (Ruhr U., Bochum) ; Reicherz, G (Ruhr U., Bochum) ; Doshita, N (Yamagata U.) ; Iwata, T (Yamagata U.) ; Kondo, K (Yamagata U.) et al.
In the large COMPASS polarized proton target the 1508 cm$^{3}$ of irradiated granular ammonia is polarized with dynamic nuclear polarization method using 4 mm microwaves in 2.5 T eld. [...]
2009. - 8 p.
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Polarized target at COMPASS
/ Doshita, Norihiro (Yamagata U.) ; Iwata, Takahiro (Yamagata U.) ; Kondo, Kaori (Yamagata U.) ; Miyachi, Yoshiyuki (Yamagata U.) ; Nukazuka, Genki (Yamagata U.) ; Reicherz, Gerhard (Ruhr U., Bochum) ; Meyer, Werner (Ruhr U., Bochum) ; Finger, Miroslav (Charles U.) ; Pesek, Michael (Charles U.) ; Horikawa, Naoaki (Chubu U.) et al.
The transversely polarized solid proton target was used in 2015 and 2018 for the polarized Drell- Yan experiment at the first in the world with a 10$^8$ /s intensity of 190 GeV pion beam at COM- PASS. Because of the radiation damage, the deterioration of the proton relaxation time of NH$_3$ was observed over more than 6 months data taking period. [...]
SISSA, 2020 - 6 p.
- Published in : PoS PSTP2019 (2020) 049
Fulltext: PDF;
In : 18th International Workshop on Polarized Sources, Targets, and Polarimetry (PSTP 2019), Knoxville, United States, 23 - 27 Sep 2019, pp.049
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Future plannings for the COMPASS polarized target
/ Reicherz, Gerhard (Ruhr U., Bochum) ; Doshita, Norihiro (Yamagata U.) ; Finger, Miroslav (Charles U.) ; Iwata, Takahiro (Yamagata U.) ; Kisselev, Yury Timofeevich (Dubna, JINR) ; Koivuniemi, Jaakko Henrik (Illinois U., Urbana (main)) ; Kondo, Kaori (Yamagata U.) ; Nukazuka, Genki (Yamagata U.) ; Matousek, Jan (Charles U., Prague (main)) ; Meyer, Werner (Ruhr U., Bochum) et al.
The COMPASS collaboration performed a polarized Drell-Yan program to measure TMD (Transverse Momentum Dependent) and PDFs (Parton Distribution Functions) in 2015. We will carry out the program for one more year in 2018 to improve the statistics. [...]
SISSA, 2018 - 6 p.
- Published in : PoS: PSTP2017 (2018) , pp. 004
Fulltext: PDF; External link: PoS server
In : 17th International Workshop on Polarized Sources, Targets, and Polarimetry, Kaist, South Korea, 16 - 20 Oct 2017, pp.004
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Polarised target for Drell-Yan experiment in COMPASS at CERN, part I
/ Matousek, J. (Charles U.) ; Finger, M. (Charles U.) ; Finger, M., Jr. (Charles U.) ; Pesek, M. (Charles U.) ; Berlin, A. (Ruhr U., Bochum) ; Gautheron, F. (Ruhr U., Bochum) ; Meyer, W. (Ruhr U., Bochum) ; Reicherz, G. (Ruhr U., Bochum) ; Doshita, N. (Yamagata U.) ; Iwata, T. (Yamagata U.) et al.
In the polarised Drell-Yan experiment at the COMPASS facility in CERN pion beam with momentum of 190 GeV/c and intensity about $10^8$ pions/s interacted with transversely polarised NH$_3$ target. [...]
arXiv:1709.06833.
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2017. - 4 p.
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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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10.
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Measurement of $P_T$-weighted Sivers asymmetries in leptoproduction of hadrons
/ COMPASS Collaboration
The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum $P_T$, allow for the extraction of important transverse-momentum-dependent distribution functions. In particular, the weighted Sivers asymmetries provide direct information on the Sivers function, which is a leading-twist distribution that arises from a correlation between the transverse momentum of an unpolarised quark in a transversely polarised nucleon and the spin of the nucleon. [...]
arXiv:1809.02936; CERN-EP-2018-242.-
Geneva : CERN, 2019-03 - 20 p.
- Published in : Nucl. Phys. B 940 (2019) 34-53
Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2018-242 - PDF; 1809.02936 - PDF;
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