The spin structure function of the proton and a test of the Bjorken sum rule

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• 作者：C. Adolphⁱ ; R. Akhunzyanov^h ; M.G. Alexeev^ab ; G.D. Alexeev^h ; A. Amoroso^ab ; ^ac ; V. Andrieux^v ; V. Anosov^h ; A. Austregesilo^q ; C. Azevedo^b ; B. Badełek^af ; F. Balestra^ab ; ^ac ; J. Barth^e ; G. Baum¹ ; R. Beck^d ; Y. Bedfer^v ; ^k ; J. Bernhardⁿ ; ^k ; K. Bicker^q ; ^k ; E.R. Bielert^k ; R. Birsa^z ; J. Bisplinghoff^d ; M. Bodlak^s ; M. Boer^v ; P. Bordalo^m ; ² ; F. Bradamante^y ; ^z ; C. Braunⁱ ; A. Bressan^y ; ^z ; ^{Andrea.Bressan@cern.ch" class="auth_mail" title="E-mail the corresponding author} ; M. Bü ; chele^j ; E. Burtin^v ; L. Capozza^v ; ³ ; W.-C. Chang^w ; M. Chiosso^ab ; ^ac ; I. Choi^ad ; S.U. Chung^q ; ⁴ ; A. Cicuttin^aa ; ^z ; M.L. Crespo^aa ; ^z ; Q. Curiel^v ; S. Dalla Torre^z ; S.S. Dasgupta^g ; S. Dasgupta^y ; ^z ; O.Yu. Denisov^ac ; L. Dhara^g ; S.V. Donskov^u ; N. Doshita^ah ; V. Duic^y ; M. Dziewiecki^ag ; A. Efremov^h ; P.D. Eversheim^d ; W. Eyrichⁱ ; A. Ferrero^v ; M. Finger^s ; M. Finger jr.^s ; H. Fischer^j ; C. Franco^m ; N. du Fresne von Hohenescheⁿ ; J.M. Friedrich^q ; V. Frolov^h ; ^k ; E. Fuchey^v ; F. Gautheron^c ; O.P. Gavrichtchouk^h ; S. Gerassimov^p ; ^q ; F. Giordano^ad ; I. Gnesi^ab ; ^ac ; M. Gorzellik^j ; S. Grabmü ; ller^q ; A. Grasso^ab ; ^ac ; M. Grosse-Perdekamp^ad ; B. Grube^q ; T. Grussenmeyer^j ; A. Guskov^h ; F. Haas^q ; D. Hahne^e ; D. von Harrachⁿ ; R. Hashimoto^ah ; F.H. Heinsius^j ; F. Herrmann^j ; F. Hinterberger^d ; N. Horikawa^r ; ⁶ ; N. d'Hose^v ; C. -Yu Hsieh^w ; S. Huber^q ; S. Ishimoto^ah ; ⁷ ; A. Ivanov^h ; Yu. Ivanshin^h ; T. Iwata^ah ; R. Jahn^d ; V. Jary^t ; P. Jö ; rg^j ; R. Joosten^d ; E. Kabu&szlig ; ⁿ ; B. Ketzer^q ; ⁸ ; G.V. Khaustov^u ; Yu.A. Khokhlov^u ; ⁹ ; Yu. Kisselev^h ; F. Klein^e ; K. Klimaszewski^ae ; J.H. Koivuniemi^c ; V.N. Kolosov^u ; K. Kondo^ah ; K. Kö ; nigsmann^j ; I. Konorov^p ; ^q ; V.F. Konstantinov^u ; A.M. Kotzinian^ab ; ^ac ; O. Kouznetsov^h ; M. Krä ; mer^q ; P. Kremser^j ; F. Krinner^q ; Z.V. Kroumchtein^h ; N. Kuchinski^h ; F. Kunne^v ; ^{Fabienne.Kunne@cern.ch" class="auth_mail" title="E-mail the corresponding author} ; K. Kurek^ae ; R.P. Kurjata^ag ; A.A. Lednev^u ; A. Lehmannⁱ ; M. Levillain^v ; S. Levorato^z ; J. Lichtenstadt^x ; R. Longo^ab ; ^ac ; A. Maggiora^ac ; A. Magnon^v ; N. Makins^ad ; N. Makke^y ; ^z ; G.K. Mallot^k ; C. Marchand^v ; A. Martin^y ; ^z ; J. Marzec^ag ; J. Matousek^s ; H. Matsuda^ah ; T. Matsuda^o ; G. Meshcheryakov^h ; W. Meyer^c ; T. Michigami^ah ; Yu.V. Mikhailov^u ; Y. Miyachi^ah ; A. Nagaytsev^h ; T. Nagel^q ; F. Nerlingⁿ ; D. Neyret^v ; V.I. Nikolaenko^u ; J. Novy^t ; ^k ; W.-D. Nowak^j ; A.S. Nunes^m ; A.G. Olshevsky^h ; I. Orlov^h ; M. Ostrickⁿ ; D. Panzieri^a ; ^ac ; B. Parsamyan^ab ; ^ac ; S. Paul^q ; J.-C. Peng^ad ; F. Pereira^b ; M. Pesek^s ; D.V. Peshekhonov^h ; S. Platchkov^v ; J. Pochodzallaⁿ ; V.A. Polyakov^u ; J. Pretz^e ; ¹⁰ ; M. Quaresma^m ; C. Quintans^m ; S. Ramos^m ; ² ; C. Regali^j ; G. Reicherz^c ; C. Riedl^ad ; E. Rocco^k ; N.S. Rossiyskaya^h ; D.I. Ryabchikov^u ; A. Rychter^ag ; V.D. Samoylenko^u ; A. Sandacz^ae ; C. Santos^z ; S. Sarkar^g ; I.A. Savin^h ; G. Sbrizzai^y ; ^z ; P. Schiavon^y ; ^z ; K. Schmidt^j ; ⁵ ; H. Schmieden^e ; K. Schö ; nning^k ; ¹¹ ; S. Schopferer^j ; A. Selyunin^h ; O.Yu. Shevchenko^h ; ²² ; L. Silva^m ; L. Sinha^g ; S. Sirtl^j ; M. Slunecka^h ; F. Sozzi^z ; A. Srnka^f ; M. Stolarski^m ; M. Sulc^l ; H. Suzuki^ah ; ⁶ ; A. Szabelski^ae ; T. Szameitat^j ; ⁵ ; P. Sznajder^ae ; S. Takekawa^ab ; ^ac ; J. ter Wolbeek^j ; ⁵ ; S. Tessaro^z ; F. Tessarotto^z ; F. Thibaud^v ; F. Tosello^ac ; V. Tskhay^p ; S. Uhl^q ; J. Veloso^b ; M. Virius^t ; T. Weisrockⁿ ; M. Wilfertⁿ ; R. Windmolders^e ; K. Zaremba^ag ; M. Zavertyaev^p ; E. Zemlyanichkina^h ; M. Ziembicki^ag ; A. Zinkⁱ
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 February 2016
• 年：2016
• 卷：753
• 期：Complete
• 页码：18-28
• 全文大小：771 K

文摘

New results for the double spin asymmetry e="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931500920X&_mathId=si2.gif&_user=111111111&_pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=60e5ed137920277b1fa2d385b5893ba7">eImage" height="18" width="18" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037026931500920X-si2.gif">er hidden">e"> and the proton longitudinal spin structure function e="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931500920X&_mathId=si1.gif&_user=111111111&_pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=df4781a19460dc8a7b131b0c30a63a2c">eImage" height="18" width="16" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037026931500920X-si1.gif">er hidden">e"> are presented. They were obtained by the COMPASS Collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH₃ target. The data were collected in 2011 and complement those recorded in 2007 at 160 GeV, in particular at lower values of <em>x  em>. They improve the statistical precision of e="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931500920X&_mathId=si3.gif&_user=111111111&_pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=3971c9b5bde7cc446aaa4641b8338bd6">eImage" height="18" width="33" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037026931500920X-si3.gif">er hidden">e"> by about a factor of two in the region ext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931500920X&_mathId=si4.gif&_user=111111111&_pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=c90b74e4e071509a5ab0f1ac1e4d354d" title="Click to view the MathML source">x≲0.02er hidden">e">. A next-to-leading order QCD fit to the ext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931500920X&_mathId=si5.gif&_user=111111111&_pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=2b2ba8da21658a2a4619de4ab36443fc" title="Click to view the MathML source">g₁er hidden">e"> world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, ΔΣ, ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of e="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931500920X&_mathId=si1.gif&_user=111111111&_pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=df4781a19460dc8a7b131b0c30a63a2c">eImage" height="18" width="16" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037026931500920X-si1.gif">er hidden">e">. The uncertainty of ΔΣ is mostly due to the large uncertainty in the present determinations of the gluon helicity distribution. A new evaluation of the Bjorken sum rule based on the COMPASS results for the non-singlet structure function e="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931500920X&_mathId=si6.gif&_user=111111111&_pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=7b016fddae32f570b7d2180bb5f97293">eImage" height="18" width="66" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037026931500920X-si6.gif">er hidden">e"> yields as ratio of the axial and vector coupling constants ext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931500920X&_mathId=si7.gif&_user=111111111&_pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=796ceafc1cab98b3989adaeae63462bc" title="Click to view the MathML source">|g_A/g_V|=1.22±0.05 (stat.)±0.10 (syst.)er hidden">e">, which validates the sum rule to an accuracy of about 9%.