Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data
Abstract Using a novel analysis technique, the gluon polarisation in the nucleon is re-evaluated using the longitudinal double-spin asymmetry measured in the cross section of semi-inclusive single-hadron muoproduction with photon virtuality $$Q^2>1~(\mathrm{GeV}/c)^2$$ Q 2 > 1 ( GeV / c ) 2 ....
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| Format: | Article |
| Language: | English |
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SpringerOpen
2017-04-01
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| Series: | European Physical Journal C: Particles and Fields |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-017-4716-x |
| _version_ | 1818444068387028992 |
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| author | C. Adolph M. Aghasyan R. Akhunzyanov M. G. Alexeev G. D. Alexeev A. Amoroso V. Andrieux N. V. Anfimov V. Anosov W. Augustyniak A. Austregesilo C. D. R. Azevedo B. Badełek F. Balestra J. Barth R. Beck Y. Bedfer J. Bernhard K. Bicker E. R. Bielert R. Birsa J. Bisplinghoff M. Bodlak M. Boer P. Bordalo F. Bradamante C. Braun A. Bressan M. Büchele W.-C. Chang M. Chiosso I. Choi S.-U. Chung A. Cicuttin M. L. Crespo Q. Curiel S. Dalla Torre S. S. Dasgupta S. Dasgupta O. Yu. Denisov L. Dhara S. V. Donskov N. Doshita V. Duic W. Dünnweber M. Dziewiecki A. Efremov P. D. Eversheim W. Eyrich M. Faessler A. Ferrero M. Finger M. Finger jr. H. Fischer C. Franco N. du Fresne von Hohenesche J. M. Friedrich V. Frolov E. Fuchey F. Gautheron O. P. Gavrichtchouk S. Gerassimov F. Giordano I. Gnesi M. Gorzellik S. Grabmüller A. Grasso M. Grosse Perdekamp B. Grube T. Grussenmeyer A. Guskov F. Haas D. Hahne D. von Harrach R. Hashimoto F. H. Heinsius R. Heitz F. Herrmann F. Hinterberger N. Horikawa N. d’Hose C.-Y. Hsieh S. Huber S. Ishimoto A. Ivanov Yu. Ivanshin T. Iwata R. Jahn V. Jary R. Joosten P. Jörg E. Kabuß B. Ketzer G. V. Khaustov Yu. A. Khokhlov Yu. Kisselev F. Klein K. Klimaszewski J. H. Koivuniemi V. N. Kolosov K. Kondo K. Königsmann I. Konorov V. F. Konstantinov A. M. Kotzinian O. M. Kouznetsov M. Krämer P. Kremser F. Krinner Z. V. Kroumchtein Y. Kulinich F. Kunne K. Kurek R. P. Kurjata A. A. Lednev A. Lehmann M. Levillain S. Levorato J. Lichtenstadt R. Longo A. Maggiora A. Magnon N. Makins N. Makke G. K. Mallot C. Marchand B. Marianski A. Martin J. Marzec J. Matoušek H. Matsuda T. Matsuda G. V. Meshcheryakov W. Meyer T. Michigami Yu. V. Mikhailov M. Mikhasenko Y. Miyachi P. Montuenga A. Nagaytsev F. Nerling D. Neyret V. I. Nikolaenko J. Nový W.-D. Nowak G. Nukazuka A. S. Nunes A. G. Olshevsky I. Orlov M. Ostrick D. Panzieri B. Parsamyan S. Paul J.-C. Peng F. Pereira M. Pešek D. V. Peshekhonov S. Platchkov J. Pochodzalla V. A. Polyakov J. Pretz M. Quaresma C. Quintans S. Ramos C. Regali G. Reicherz C. Riedl M. Roskot N. S. Rossiyskaya D. I. Ryabchikov A. Rybnikov A. Rychter R. Salac V. D. Samoylenko A. Sandacz C. Santos S. Sarkar I. A. Savin T. Sawada G. Sbrizzai P. Schiavon K. Schmidt H. Schmieden K. Schönning S. Schopferer E. Seder A. Selyunin O. Yu. Shevchenko L. Silva L. Sinha S. Sirtl M. Slunecka J. Smolik F. Sozzi A. Srnka M. Stolarski M. Sulc H. Suzuki A. Szabelski T. Szameitat P. Sznajder S. Takekawa M. Tasevsky S. Tessaro F. Tessarotto F. Thibaud F. Tosello V. Tskhay S. Uhl J. Veloso M. Virius J. Vondra T. Weisrock M. Wilfert J. ter Wolbeek K. Zaremba P. Zavada M. Zavertyaev E. Zemlyanichkina M. Ziembicki A. Zink COMPASS Collaboration |
| author_facet | C. Adolph M. Aghasyan R. Akhunzyanov M. G. Alexeev G. D. Alexeev A. Amoroso V. Andrieux N. V. Anfimov V. Anosov W. Augustyniak A. Austregesilo C. D. R. Azevedo B. Badełek F. Balestra J. Barth R. Beck Y. Bedfer J. Bernhard K. Bicker E. R. Bielert R. Birsa J. Bisplinghoff M. Bodlak M. Boer P. Bordalo F. Bradamante C. Braun A. Bressan M. Büchele W.-C. Chang M. Chiosso I. Choi S.-U. Chung A. Cicuttin M. L. Crespo Q. Curiel S. Dalla Torre S. S. Dasgupta S. Dasgupta O. Yu. Denisov L. Dhara S. V. Donskov N. Doshita V. Duic W. Dünnweber M. Dziewiecki A. Efremov P. D. Eversheim W. Eyrich M. Faessler A. Ferrero M. Finger M. Finger jr. H. Fischer C. Franco N. du Fresne von Hohenesche J. M. Friedrich V. Frolov E. Fuchey F. Gautheron O. P. Gavrichtchouk S. Gerassimov F. Giordano I. Gnesi M. Gorzellik S. Grabmüller A. Grasso M. Grosse Perdekamp B. Grube T. Grussenmeyer A. Guskov F. Haas D. Hahne D. von Harrach R. Hashimoto F. H. Heinsius R. Heitz F. Herrmann F. Hinterberger N. Horikawa N. d’Hose C.-Y. Hsieh S. Huber S. Ishimoto A. Ivanov Yu. Ivanshin T. Iwata R. Jahn V. Jary R. Joosten P. Jörg E. Kabuß B. Ketzer G. V. Khaustov Yu. A. Khokhlov Yu. Kisselev F. Klein K. Klimaszewski J. H. Koivuniemi V. N. Kolosov K. Kondo K. Königsmann I. Konorov V. F. Konstantinov A. M. Kotzinian O. M. Kouznetsov M. Krämer P. Kremser F. Krinner Z. V. Kroumchtein Y. Kulinich F. Kunne K. Kurek R. P. Kurjata A. A. Lednev A. Lehmann M. Levillain S. Levorato J. Lichtenstadt R. Longo A. Maggiora A. Magnon N. Makins N. Makke G. K. Mallot C. Marchand B. Marianski A. Martin J. Marzec J. Matoušek H. Matsuda T. Matsuda G. V. Meshcheryakov W. Meyer T. Michigami Yu. V. Mikhailov M. Mikhasenko Y. Miyachi P. Montuenga A. Nagaytsev F. Nerling D. Neyret V. I. Nikolaenko J. Nový W.-D. Nowak G. Nukazuka A. S. Nunes A. G. Olshevsky I. Orlov M. Ostrick D. Panzieri B. Parsamyan S. Paul J.-C. Peng F. Pereira M. Pešek D. V. Peshekhonov S. Platchkov J. Pochodzalla V. A. Polyakov J. Pretz M. Quaresma C. Quintans S. Ramos C. Regali G. Reicherz C. Riedl M. Roskot N. S. Rossiyskaya D. I. Ryabchikov A. Rybnikov A. Rychter R. Salac V. D. Samoylenko A. Sandacz C. Santos S. Sarkar I. A. Savin T. Sawada G. Sbrizzai P. Schiavon K. Schmidt H. Schmieden K. Schönning S. Schopferer E. Seder A. Selyunin O. Yu. Shevchenko L. Silva L. Sinha S. Sirtl M. Slunecka J. Smolik F. Sozzi A. Srnka M. Stolarski M. Sulc H. Suzuki A. Szabelski T. Szameitat P. Sznajder S. Takekawa M. Tasevsky S. Tessaro F. Tessarotto F. Thibaud F. Tosello V. Tskhay S. Uhl J. Veloso M. Virius J. Vondra T. Weisrock M. Wilfert J. ter Wolbeek K. Zaremba P. Zavada M. Zavertyaev E. Zemlyanichkina M. Ziembicki A. Zink COMPASS Collaboration |
| author_sort | C. Adolph |
| collection | DOAJ |
| description | Abstract Using a novel analysis technique, the gluon polarisation in the nucleon is re-evaluated using the longitudinal double-spin asymmetry measured in the cross section of semi-inclusive single-hadron muoproduction with photon virtuality $$Q^2>1~(\mathrm{GeV}/c)^2$$ Q 2 > 1 ( GeV / c ) 2 . The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam impinging on a polarised $$^6$$ 6 LiD target. By analysing the full range in hadron transverse momentum $$p_\mathrm{T}$$ p T , the different $$p_\mathrm{T}$$ p T -dependences of the underlying processes are separated using a neural-network approach. In the absence of pQCD calculations at next-to-leading order in the selected kinematic domain, the gluon polarisation $$\Delta g/g$$ Δ g / g is evaluated at leading order in pQCD at a hard scale of $$\mu ^2= \langle Q^2 \rangle = 3 (\mathrm{GeV}/c)^2$$ μ 2 = ⟨ Q 2 ⟩ = 3 ( GeV / c ) 2 . It is determined in three intervals of the nucleon momentum fraction carried by gluons, $$x_\mathrm{g}$$ x g , covering the range $$0.04 \!<\! x_{ \mathrm g}\! <\! 0.28$$ 0.04 < x g < 0.28 and does not exhibit a significant dependence on $$x_\mathrm{g}$$ x g . The average over the three intervals, $$\langle \Delta g/g \rangle = 0.113 \pm 0.038_\mathrm{(stat.)}\pm 0.036_\mathrm{(syst.)}$$ ⟨ Δ g / g ⟩ = 0.113 ± 0 . 038 ( stat . ) ± 0 . 036 ( syst . ) at $$\langle x_\mathrm{g} \rangle \approx 0.10$$ ⟨ x g ⟩ ≈ 0.10 , suggests that the gluon polarisation is positive in the measured $$x_\mathrm{g}$$ x g range. |
| first_indexed | 2024-12-14T19:10:03Z |
| format | Article |
| id | doaj.art-64270c24bfdc4ca184d1472836be642c |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-14T19:10:03Z |
| publishDate | 2017-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-64270c24bfdc4ca184d1472836be642c2022-12-21T22:50:44ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522017-04-0177411210.1140/epjc/s10052-017-4716-xLeading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering dataC. Adolph0M. Aghasyan1R. Akhunzyanov2M. G. Alexeev3G. D. Alexeev4A. Amoroso5V. Andrieux6N. V. Anfimov7V. Anosov8W. Augustyniak9A. Austregesilo10C. D. R. Azevedo11B. Badełek12F. Balestra13J. Barth14R. Beck15Y. Bedfer16J. Bernhard17K. Bicker18E. R. Bielert19R. Birsa20J. Bisplinghoff21M. Bodlak22M. Boer23P. Bordalo24F. Bradamante25C. Braun26A. Bressan27M. Büchele28W.-C. Chang29M. Chiosso30I. Choi31S.-U. Chung32A. Cicuttin33M. L. Crespo34Q. Curiel35S. Dalla Torre36S. S. Dasgupta37S. Dasgupta38O. Yu. Denisov39L. Dhara40S. V. Donskov41N. Doshita42V. Duic43W. Dünnweber44M. Dziewiecki45A. Efremov46P. D. Eversheim47W. Eyrich48M. Faessler49A. Ferrero50M. Finger51M. Finger jr.52H. Fischer53C. Franco54N. du Fresne von Hohenesche55J. M. Friedrich56V. Frolov57E. Fuchey58F. Gautheron59O. P. Gavrichtchouk60S. Gerassimov61F. Giordano62I. Gnesi63M. Gorzellik64S. Grabmüller65A. Grasso66M. Grosse Perdekamp67B. Grube68T. Grussenmeyer69A. Guskov70F. Haas71D. Hahne72D. von Harrach73R. Hashimoto74F. H. Heinsius75R. Heitz76F. Herrmann77F. Hinterberger78N. Horikawa79N. d’Hose80C.-Y. Hsieh81S. Huber82S. Ishimoto83A. Ivanov84Yu. Ivanshin85T. Iwata86R. Jahn87V. Jary88R. Joosten89P. Jörg90E. Kabuß91B. Ketzer92G. V. Khaustov93Yu. A. Khokhlov94Yu. Kisselev95F. Klein96K. Klimaszewski97J. H. Koivuniemi98V. N. Kolosov99K. Kondo100K. Königsmann101I. Konorov102V. F. Konstantinov103A. M. Kotzinian104O. M. Kouznetsov105M. Krämer106P. Kremser107F. Krinner108Z. V. Kroumchtein109Y. Kulinich110F. Kunne111K. Kurek112R. P. Kurjata113A. A. Lednev114A. Lehmann115M. Levillain116S. Levorato117J. Lichtenstadt118R. Longo119A. Maggiora120A. Magnon121N. Makins122N. Makke123G. K. Mallot124C. Marchand125B. Marianski126A. Martin127J. Marzec128J. Matoušek129H. Matsuda130T. Matsuda131G. V. Meshcheryakov132W. Meyer133T. Michigami134Yu. V. Mikhailov135M. Mikhasenko136Y. Miyachi137P. Montuenga138A. Nagaytsev139F. Nerling140D. Neyret141V. I. Nikolaenko142J. Nový143W.-D. Nowak144G. Nukazuka145A. S. Nunes146A. G. Olshevsky147I. Orlov148M. Ostrick149D. Panzieri150B. Parsamyan151S. Paul152J.-C. Peng153F. Pereira154M. Pešek155D. V. Peshekhonov156S. Platchkov157J. Pochodzalla158V. A. Polyakov159J. Pretz160M. Quaresma161C. Quintans162S. Ramos163C. Regali164G. Reicherz165C. Riedl166M. Roskot167N. S. Rossiyskaya168D. I. Ryabchikov169A. Rybnikov170A. Rychter171R. Salac172V. D. Samoylenko173A. Sandacz174C. Santos175S. Sarkar176I. A. Savin177T. Sawada178G. Sbrizzai179P. Schiavon180K. Schmidt181H. Schmieden182K. Schönning183S. Schopferer184E. Seder185A. Selyunin186O. Yu. Shevchenko187L. Silva188L. Sinha189S. Sirtl190M. Slunecka191J. Smolik192F. Sozzi193A. Srnka194M. Stolarski195M. Sulc196H. Suzuki197A. Szabelski198T. Szameitat199P. Sznajder200S. Takekawa201M. Tasevsky202S. Tessaro203F. Tessarotto204F. Thibaud205F. Tosello206V. Tskhay207S. Uhl208J. Veloso209M. Virius210J. Vondra211T. Weisrock212M. Wilfert213J. ter Wolbeek214K. Zaremba215P. Zavada216M. Zavertyaev217E. Zemlyanichkina218M. Ziembicki219A. Zink220COMPASS Collaboration221Physikalisches Institut, Universität Erlangen–NürnbergTrieste Section of INFNJoint Institute for Nuclear ResearchDepartment of Physics, University of TurinJoint Institute for Nuclear ResearchDepartment of Physics, University of TurinCEA IRFU/SPhN SaclayJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchNational Centre for Nuclear ResearchPhysik Department, Technische Universität MünchenDepartment of Physics, University of AveiroFaculty of Physics, University of WarsawDepartment of Physics, University of TurinPhysikalisches Institut, Universität BonnHelmholtz-Institut für Strahlen- und Kernphysik, Universität BonnCERNCERNCERNCERNTrieste Section of INFNHelmholtz-Institut für Strahlen- und Kernphysik, Universität BonnFaculty of Mathematics and Physics, Charles University in PragueCEA IRFU/SPhN SaclayLIPDepartment of Physics, University of TriestePhysikalisches Institut, Universität Erlangen–NürnbergDepartment of Physics, University of TriestePhysikalisches Institut, Universität FreiburgInstitute of Physics, Academia SinicaDepartment of Physics, University of TurinDepartment of Physics, University of Illinois at Urbana-ChampaignPhysik Department, Technische Universität MünchenTrieste Section of INFNTrieste Section of INFNCEA IRFU/SPhN SaclayTrieste Section of INFNMatrivani Institute of Experimental Research and EducationDepartment of Physics, University of TriesteTorino Section of INFNMatrivani Institute of Experimental Research and EducationState Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’Yamagata UniversityDepartment of Physics, University of TriesteRetired from Ludwig-Maximilians-Universität München, Department für PhysikInstitute of Radioelectronics, Warsaw University of TechnologyJoint Institute for Nuclear ResearchHelmholtz-Institut für Strahlen- und Kernphysik, Universität BonnPhysikalisches Institut, Universität Erlangen–NürnbergRetired from Ludwig-Maximilians-Universität München, Department für PhysikCEA IRFU/SPhN SaclayFaculty of Mathematics and Physics, Charles University in PragueFaculty of Mathematics and Physics, Charles University in PraguePhysikalisches Institut, Universität FreiburgLIPInstitut für Kernphysik, Universität MainzPhysik Department, Technische Universität MünchenJoint Institute for Nuclear ResearchCEA IRFU/SPhN SaclayInstitut für Experimentalphysik, Universität BochumJoint Institute for Nuclear ResearchLebedev Physical InstituteDepartment of Physics, University of Illinois at Urbana-ChampaignDepartment of Physics, University of TurinPhysikalisches Institut, Universität FreiburgPhysik Department, Technische Universität MünchenDepartment of Physics, University of TurinDepartment of Physics, University of Illinois at Urbana-ChampaignPhysik Department, Technische Universität MünchenPhysikalisches Institut, Universität FreiburgJoint Institute for Nuclear ResearchPhysik Department, Technische Universität MünchenPhysikalisches Institut, Universität BonnInstitut für Kernphysik, Universität MainzYamagata UniversityPhysikalisches Institut, Universität FreiburgDepartment of Physics, University of Illinois at Urbana-ChampaignPhysikalisches Institut, Universität FreiburgHelmholtz-Institut für Strahlen- und Kernphysik, Universität BonnNagoya UniversityCEA IRFU/SPhN SaclayInstitute of Physics, Academia SinicaPhysik Department, Technische Universität MünchenYamagata UniversityDepartment of Physics, University of TurinJoint Institute for Nuclear ResearchYamagata UniversityHelmholtz-Institut für Strahlen- und Kernphysik, Universität BonnCzech Technical University in PragueHelmholtz-Institut für Strahlen- und Kernphysik, Universität BonnPhysikalisches Institut, Universität FreiburgInstitut für Kernphysik, Universität MainzHelmholtz-Institut für Strahlen- und Kernphysik, Universität BonnState Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’State Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’Joint Institute for Nuclear ResearchPhysikalisches Institut, Universität BonnNational Centre for Nuclear ResearchInstitut für Experimentalphysik, Universität BochumState Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’Yamagata UniversityPhysikalisches Institut, Universität FreiburgLebedev Physical InstituteState Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’Department of Physics, University of TurinJoint Institute for Nuclear ResearchPhysik Department, Technische Universität MünchenPhysikalisches Institut, Universität FreiburgPhysik Department, Technische Universität MünchenJoint Institute for Nuclear ResearchDepartment of Physics, University of Illinois at Urbana-ChampaignCEA IRFU/SPhN SaclayNational Centre for Nuclear ResearchInstitute of Radioelectronics, Warsaw University of TechnologyState Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’Physikalisches Institut, Universität Erlangen–NürnbergCEA IRFU/SPhN SaclayTrieste Section of INFNSchool of Physics and Astronomy, Tel Aviv UniversityDepartment of Physics, University of TurinTorino Section of INFNCEA IRFU/SPhN SaclayDepartment of Physics, University of Illinois at Urbana-ChampaignDepartment of Physics, University of TriesteCERNCEA IRFU/SPhN SaclayNational Centre for Nuclear ResearchDepartment of Physics, University of TriesteInstitute of Radioelectronics, Warsaw University of TechnologyFaculty of Mathematics and Physics, Charles University in PragueYamagata UniversityUniversity of MiyazakiJoint Institute for Nuclear ResearchInstitut für Experimentalphysik, Universität BochumYamagata UniversityState Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’Helmholtz-Institut für Strahlen- und Kernphysik, Universität BonnYamagata UniversityDepartment of Physics, University of Illinois at Urbana-ChampaignJoint Institute for Nuclear ResearchInstitut für Kernphysik, Universität MainzCEA IRFU/SPhN SaclayState Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’CERNPhysikalisches Institut, Universität FreiburgYamagata UniversityLIPJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchInstitut für Kernphysik, Universität MainzTorino Section of INFNDepartment of Physics, University of TurinPhysik Department, Technische Universität MünchenDepartment of Physics, University of Illinois at Urbana-ChampaignDepartment of Physics, University of AveiroFaculty of Mathematics and Physics, Charles University in PragueJoint Institute for Nuclear ResearchCEA IRFU/SPhN SaclayInstitut für Kernphysik, Universität MainzState Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’Physikalisches Institut, Universität BonnLIPLIPLIPPhysikalisches Institut, Universität FreiburgInstitut für Experimentalphysik, Universität BochumDepartment of Physics, University of Illinois at Urbana-ChampaignFaculty of Mathematics and Physics, Charles University in PragueJoint Institute for Nuclear ResearchState Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’Joint Institute for Nuclear ResearchInstitute of Radioelectronics, Warsaw University of TechnologyCzech Technical University in PragueState Scientific Center Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’National Centre for Nuclear ResearchTrieste Section of INFNMatrivani Institute of Experimental Research and EducationJoint Institute for Nuclear ResearchInstitute of Physics, Academia SinicaDepartment of Physics, University of TriesteDepartment of Physics, University of TriestePhysikalisches Institut, Universität FreiburgPhysikalisches Institut, Universität BonnCERNPhysikalisches Institut, Universität FreiburgCEA IRFU/SPhN SaclayJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchLIPMatrivani Institute of Experimental Research and EducationPhysikalisches Institut, Universität FreiburgJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchTrieste Section of INFNInstitute of Scientific Instruments, AS CRLIPTechnical University in LiberecYamagata UniversityNational Centre for Nuclear ResearchPhysikalisches Institut, Universität FreiburgNational Centre for Nuclear ResearchDepartment of Physics, University of TurinJoint Institute for Nuclear ResearchTrieste Section of INFNTrieste Section of INFNCEA IRFU/SPhN SaclayTorino Section of INFNLebedev Physical InstitutePhysik Department, Technische Universität MünchenDepartment of Physics, University of AveiroCzech Technical University in PragueCzech Technical University in PragueInstitut für Kernphysik, Universität MainzInstitut für Kernphysik, Universität MainzPhysikalisches Institut, Universität FreiburgInstitute of Radioelectronics, Warsaw University of TechnologyJoint Institute for Nuclear ResearchLebedev Physical InstituteJoint Institute for Nuclear ResearchInstitute of Radioelectronics, Warsaw University of TechnologyPhysikalisches Institut, Universität Erlangen–NürnbergCERNAbstract Using a novel analysis technique, the gluon polarisation in the nucleon is re-evaluated using the longitudinal double-spin asymmetry measured in the cross section of semi-inclusive single-hadron muoproduction with photon virtuality $$Q^2>1~(\mathrm{GeV}/c)^2$$ Q 2 > 1 ( GeV / c ) 2 . The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam impinging on a polarised $$^6$$ 6 LiD target. By analysing the full range in hadron transverse momentum $$p_\mathrm{T}$$ p T , the different $$p_\mathrm{T}$$ p T -dependences of the underlying processes are separated using a neural-network approach. In the absence of pQCD calculations at next-to-leading order in the selected kinematic domain, the gluon polarisation $$\Delta g/g$$ Δ g / g is evaluated at leading order in pQCD at a hard scale of $$\mu ^2= \langle Q^2 \rangle = 3 (\mathrm{GeV}/c)^2$$ μ 2 = ⟨ Q 2 ⟩ = 3 ( GeV / c ) 2 . It is determined in three intervals of the nucleon momentum fraction carried by gluons, $$x_\mathrm{g}$$ x g , covering the range $$0.04 \!<\! x_{ \mathrm g}\! <\! 0.28$$ 0.04 < x g < 0.28 and does not exhibit a significant dependence on $$x_\mathrm{g}$$ x g . The average over the three intervals, $$\langle \Delta g/g \rangle = 0.113 \pm 0.038_\mathrm{(stat.)}\pm 0.036_\mathrm{(syst.)}$$ ⟨ Δ g / g ⟩ = 0.113 ± 0 . 038 ( stat . ) ± 0 . 036 ( syst . ) at $$\langle x_\mathrm{g} \rangle \approx 0.10$$ ⟨ x g ⟩ ≈ 0.10 , suggests that the gluon polarisation is positive in the measured $$x_\mathrm{g}$$ x g range.http://link.springer.com/article/10.1140/epjc/s10052-017-4716-xTransverse MomentumMonte CarloSystematic UncertaintyParton ShowerMonte Carlo Model |
| spellingShingle | C. Adolph M. Aghasyan R. Akhunzyanov M. G. Alexeev G. D. Alexeev A. Amoroso V. Andrieux N. V. Anfimov V. Anosov W. Augustyniak A. Austregesilo C. D. R. Azevedo B. Badełek F. Balestra J. Barth R. Beck Y. Bedfer J. Bernhard K. Bicker E. R. Bielert R. Birsa J. Bisplinghoff M. Bodlak M. Boer P. Bordalo F. Bradamante C. Braun A. Bressan M. Büchele W.-C. Chang M. Chiosso I. Choi S.-U. Chung A. Cicuttin M. L. Crespo Q. Curiel S. Dalla Torre S. S. Dasgupta S. Dasgupta O. Yu. Denisov L. Dhara S. V. Donskov N. Doshita V. Duic W. Dünnweber M. Dziewiecki A. Efremov P. D. Eversheim W. Eyrich M. Faessler A. Ferrero M. Finger M. Finger jr. H. Fischer C. Franco N. du Fresne von Hohenesche J. M. Friedrich V. Frolov E. Fuchey F. Gautheron O. P. Gavrichtchouk S. Gerassimov F. Giordano I. Gnesi M. Gorzellik S. Grabmüller A. Grasso M. Grosse Perdekamp B. Grube T. Grussenmeyer A. Guskov F. Haas D. Hahne D. von Harrach R. Hashimoto F. H. Heinsius R. Heitz F. Herrmann F. Hinterberger N. Horikawa N. d’Hose C.-Y. Hsieh S. Huber S. Ishimoto A. Ivanov Yu. Ivanshin T. Iwata R. Jahn V. Jary R. Joosten P. Jörg E. Kabuß B. Ketzer G. V. Khaustov Yu. A. Khokhlov Yu. Kisselev F. Klein K. Klimaszewski J. H. Koivuniemi V. N. Kolosov K. Kondo K. Königsmann I. Konorov V. F. Konstantinov A. M. Kotzinian O. M. Kouznetsov M. Krämer P. Kremser F. Krinner Z. V. Kroumchtein Y. Kulinich F. Kunne K. Kurek R. P. Kurjata A. A. Lednev A. Lehmann M. Levillain S. Levorato J. Lichtenstadt R. Longo A. Maggiora A. Magnon N. Makins N. Makke G. K. Mallot C. Marchand B. Marianski A. Martin J. Marzec J. Matoušek H. Matsuda T. Matsuda G. V. Meshcheryakov W. Meyer T. Michigami Yu. V. Mikhailov M. Mikhasenko Y. Miyachi P. Montuenga A. Nagaytsev F. Nerling D. Neyret V. I. Nikolaenko J. Nový W.-D. Nowak G. Nukazuka A. S. Nunes A. G. Olshevsky I. Orlov M. Ostrick D. Panzieri B. Parsamyan S. Paul J.-C. Peng F. Pereira M. Pešek D. V. Peshekhonov S. Platchkov J. Pochodzalla V. A. Polyakov J. Pretz M. Quaresma C. Quintans S. Ramos C. Regali G. Reicherz C. Riedl M. Roskot N. S. Rossiyskaya D. I. Ryabchikov A. Rybnikov A. Rychter R. Salac V. D. Samoylenko A. Sandacz C. Santos S. Sarkar I. A. Savin T. Sawada G. Sbrizzai P. Schiavon K. Schmidt H. Schmieden K. Schönning S. Schopferer E. Seder A. Selyunin O. Yu. Shevchenko L. Silva L. Sinha S. Sirtl M. Slunecka J. Smolik F. Sozzi A. Srnka M. Stolarski M. Sulc H. Suzuki A. Szabelski T. Szameitat P. Sznajder S. Takekawa M. Tasevsky S. Tessaro F. Tessarotto F. Thibaud F. Tosello V. Tskhay S. Uhl J. Veloso M. Virius J. Vondra T. Weisrock M. Wilfert J. ter Wolbeek K. Zaremba P. Zavada M. Zavertyaev E. Zemlyanichkina M. Ziembicki A. Zink COMPASS Collaboration Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data European Physical Journal C: Particles and Fields Transverse Momentum Monte Carlo Systematic Uncertainty Parton Shower Monte Carlo Model |
| title | Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data |
| title_full | Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data |
| title_fullStr | Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data |
| title_full_unstemmed | Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data |
| title_short | Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data |
| title_sort | leading order determination of the gluon polarisation from semi inclusive deep inelastic scattering data |
| topic | Transverse Momentum Monte Carlo Systematic Uncertainty Parton Shower Monte Carlo Model |
| url | http://link.springer.com/article/10.1140/epjc/s10052-017-4716-x |
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