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

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• 作者：C. Adolphp>ip> ; R. Akhunzyanovp>hp> ; M.G. Alexeevp>abp> ; G.D. Alexeevp>hp> ; A. Amorosop>abp>p> ; p>p>acp> ; V. Andrieuxp>vp> ; V. Anosovp>hp> ; A. Austregesilop>qp> ; C. Azevedop>bp> ; B. Badełekp>afp> ; F. Balestrap>abp>p> ; p>p>acp> ; J. Barthp>ep> ; G. Baump>1p> ; R. Beckp>dp> ; Y. Bedferp>vp>p> ; p>p>kp> ; J. Bernhardp>np>p> ; p>p>kp> ; K. Bickerp>qp>p> ; p>p>kp> ; E.R. Bielertp>kp> ; R. Birsap>zp> ; J. Bisplinghoffp>dp> ; M. Bodlakp>sp> ; M. Boerp>vp> ; P. Bordalop>mp>p> ; p>p>2p> ; F. Bradamantep>yp>p> ; p>p>zp> ; C. Braunp>ip> ; A. Bressanp>yp>p> ; p>p>zp>p> ; p>p>Andrea.Bressan@cern.ch" class="auth_mail" title="E-mail the corresponding authorp> ; M. Bü ; chelep>jp> ; E. Burtinp>vp> ; L. Capozzap>vp>p> ; p>p>3p> ; W.-C. Changp>wp> ; M. Chiossop>abp>p> ; p>p>acp> ; I. Choip>adp> ; S.U. Chungp>qp>p> ; p>p>4p> ; A. Cicuttinp>aap>p> ; p>p>zp> ; M.L. Crespop>aap>p> ; p>p>zp> ; Q. Curielp>vp> ; S. Dalla Torrep>zp> ; S.S. Dasguptap>gp> ; S. Dasguptap>yp>p> ; p>p>zp> ; O.Yu. Denisovp>acp> ; L. Dharap>gp> ; S.V. Donskovp>up> ; N. Doshitap>ahp> ; V. Duicp>yp> ; M. Dziewieckip>agp> ; A. Efremovp>hp> ; P.D. Eversheimp>dp> ; W. Eyrichp>ip> ; A. Ferrerop>vp> ; M. Fingerp>sp> ; M. Finger jr.p>sp> ; H. Fischerp>jp> ; C. Francop>mp> ; N. du Fresne von Hoheneschep>np> ; J.M. Friedrichp>qp> ; V. Frolovp>hp>p> ; p>p>kp> ; E. Fucheyp>vp> ; F. Gautheronp>cp> ; O.P. Gavrichtchoukp>hp> ; S. Gerassimovp>pp>p> ; p>p>qp> ; F. Giordanop>adp> ; I. Gnesip>abp>p> ; p>p>acp> ; M. Gorzellikp>jp> ; S. Grabmü ; llerp>qp> ; A. Grassop>abp>p> ; p>p>acp> ; M. Grosse-Perdekampp>adp> ; B. Grubep>qp> ; T. Grussenmeyerp>jp> ; A. Guskovp>hp> ; F. Haasp>qp> ; D. Hahnep>ep> ; D. von Harrachp>np> ; R. Hashimotop>ahp> ; F.H. Heinsiusp>jp> ; F. Herrmannp>jp> ; F. Hinterbergerp>dp> ; N. Horikawap>rp>p> ; p>p>6p> ; N. d'Hosep>vp> ; C. -Yu Hsiehp>wp> ; S. Huberp>qp> ; S. Ishimotop>ahp>p> ; p>p>7p> ; A. Ivanovp>hp> ; Yu. Ivanshinp>hp> ; T. Iwatap>ahp> ; R. Jahnp>dp> ; V. Jaryp>tp> ; P. Jö ; rgp>jp> ; R. Joostenp>dp> ; E. Kabuß ; p>np> ; B. Ketzerp>qp>p> ; p>p>8p> ; G.V. Khaustovp>up> ; Yu.A. Khokhlovp>up>p> ; p>p>9p> ; Yu. Kisselevp>hp> ; F. Kleinp>ep> ; K. Klimaszewskip>aep> ; J.H. Koivuniemip>cp> ; V.N. Kolosovp>up> ; K. Kondop>ahp> ; K. Kö ; nigsmannp>jp> ; I. Konorovp>pp>p> ; p>p>qp> ; V.F. Konstantinovp>up> ; A.M. Kotzinianp>abp>p> ; p>p>acp> ; O. Kouznetsovp>hp> ; M. Krä ; merp>qp> ; P. Kremserp>jp> ; F. Krinnerp>qp> ; Z.V. Kroumchteinp>hp> ; N. Kuchinskip>hp> ; F. Kunnep>vp>p> ; p>p>Fabienne.Kunne@cern.ch" class="auth_mail" title="E-mail the corresponding authorp> ; K. Kurekp>aep> ; R.P. Kurjatap>agp> ; A.A. Lednevp>up> ; A. Lehmannp>ip> ; M. Levillainp>vp> ; S. Levoratop>zp> ; J. Lichtenstadtp>xp> ; R. Longop>abp>p> ; p>p>acp> ; A. Maggiorap>acp> ; A. Magnonp>vp> ; N. Makinsp>adp> ; N. Makkep>yp>p> ; p>p>zp> ; G.K. Mallotp>kp> ; C. Marchandp>vp> ; A. Martinp>yp>p> ; p>p>zp> ; J. Marzecp>agp> ; J. Matousekp>sp> ; H. Matsudap>ahp> ; T. Matsudap>op> ; G. Meshcheryakovp>hp> ; W. Meyerp>cp> ; T. Michigamip>ahp> ; Yu.V. Mikhailovp>up> ; Y. Miyachip>ahp> ; A. Nagaytsevp>hp> ; T. Nagelp>qp> ; F. Nerlingp>np> ; D. Neyretp>vp> ; V.I. Nikolaenkop>up> ; J. Novyp>tp>p> ; p>p>kp> ; W.-D. Nowakp>jp> ; A.S. Nunesp>mp> ; A.G. Olshevskyp>hp> ; I. Orlovp>hp> ; M. Ostrickp>np> ; D. Panzierip>ap>p> ; p>p>acp> ; B. Parsamyanp>abp>p> ; p>p>acp> ; S. Paulp>qp> ; J.-C. Pengp>adp> ; F. Pereirap>bp> ; M. Pesekp>sp> ; D.V. Peshekhonovp>hp> ; S. Platchkovp>vp> ; J. Pochodzallap>np> ; V.A. Polyakovp>up> ; J. Pretzp>ep>p> ; p>p>10p> ; M. Quaresmap>mp> ; C. Quintansp>mp> ; S. Ramosp>mp>p> ; p>p>2p> ; C. Regalip>jp> ; G. Reicherzp>cp> ; C. Riedlp>adp> ; E. Roccop>kp> ; N.S. Rossiyskayap>hp> ; D.I. Ryabchikovp>up> ; A. Rychterp>agp> ; V.D. Samoylenkop>up> ; A. Sandaczp>aep> ; C. Santosp>zp> ; S. Sarkarp>gp> ; I.A. Savinp>hp> ; G. Sbrizzaip>yp>p> ; p>p>zp> ; P. Schiavonp>yp>p> ; p>p>zp> ; K. Schmidtp>jp>p> ; p>p>5p> ; H. Schmiedenp>ep> ; K. Schö ; nningp>kp>p> ; p>p>11p> ; S. Schopfererp>jp> ; A. Selyuninp>hp> ; O.Yu. Shevchenkop>hp>p> ; p>p>22p> ; L. Silvap>mp> ; L. Sinhap>gp> ; S. Sirtlp>jp> ; M. Sluneckap>hp> ; F. Sozzip>zp> ; A. Srnkap>fp> ; M. Stolarskip>mp> ; M. Sulcp>lp> ; H. Suzukip>ahp>p> ; p>p>6p> ; A. Szabelskip>aep> ; T. Szameitatp>jp>p> ; p>p>5p> ; P. Sznajderp>aep> ; S. Takekawap>abp>p> ; p>p>acp> ; J. ter Wolbeekp>jp>p> ; p>p>5p> ; S. Tessarop>zp> ; F. Tessarottop>zp> ; F. Thibaudp>vp> ; F. Tosellop>acp> ; V. Tskhayp>pp> ; S. Uhlp>qp> ; J. Velosop>bp> ; M. Viriusp>tp> ; T. Weisrockp>np> ; M. Wilfertp>np> ; R. Windmoldersp>ep> ; K. Zarembap>agp> ; M. Zavertyaevp>pp> ; E. Zemlyanichkinap>hp> ; M. Ziembickip>agp> ; A. Zinkp>ip>
• 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 pan id="mmlsi2" class="mathmlsrc">pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=60e5ed137920277b1fa2d385b5893ba7">pxl.gif" data-inlimgeid="1-s2.0-S037026931500920X-si2.gif">pt>p://origin-ars.els-cdn.com/content/image/1-s2.0-S037026931500920X-si2.gif">pt>pan class="mathContainer hidden">pan class="mathCode">pan>pan>pan> and the proton longitudinal spin structure function pan id="mmlsi1" class="mathmlsrc">pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=df4781a19460dc8a7b131b0c30a63a2c">pxl.gif" data-inlimgeid="1-s2.0-S037026931500920X-si1.gif">pt>p://origin-ars.els-cdn.com/content/image/1-s2.0-S037026931500920X-si1.gif">pt>pan class="mathContainer hidden">pan class="mathCode">pan>pan>pan> 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 x  . They improve the statistical precision of pan id="mmlsi3" class="mathmlsrc">pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=3971c9b5bde7cc446aaa4641b8338bd6">pxl.gif" data-inlimgeid="1-s2.0-S037026931500920X-si3.gif">pt>p://origin-ars.els-cdn.com/content/image/1-s2.0-S037026931500920X-si3.gif">pt>pan class="mathContainer hidden">pan class="mathCode">pan>pan>pan> by about a factor of two in the region pan id="mmlsi4" class="mathmlsrc">pan class="formulatext 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≲0.02pan>pan class="mathContainer hidden">pan class="mathCode">$x\lesssim 0.02$pan>pan>pan>. A next-to-leading order QCD fit to the pan id="mmlsi5" class="mathmlsrc">pan class="formulatext 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">g₁pan>pan class="mathContainer hidden">pan class="mathCode">$g_1$pan>pan>pan> 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 pan id="mmlsi1" class="mathmlsrc">pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=df4781a19460dc8a7b131b0c30a63a2c">pxl.gif" data-inlimgeid="1-s2.0-S037026931500920X-si1.gif">pt>p://origin-ars.els-cdn.com/content/image/1-s2.0-S037026931500920X-si1.gif">pt>pan class="mathContainer hidden">pan class="mathCode">pan>pan>pan>. 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 pan id="mmlsi6" class="mathmlsrc">pii=S037026931500920X&_rdoc=1&_issn=03702693&md5=7b016fddae32f570b7d2180bb5f97293">pxl.gif" data-inlimgeid="1-s2.0-S037026931500920X-si6.gif">pt>p://origin-ars.els-cdn.com/content/image/1-s2.0-S037026931500920X-si6.gif">pt>pan class="mathContainer hidden">pan class="mathCode">pan>pan>pan> yields as ratio of the axial and vector coupling constants pan id="mmlsi7" class="mathmlsrc">pan class="formulatext 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&plusmn;0.05 (stat.)&plusmn;0.10 (syst.)pan>pan class="mathContainer hidden">pan class="mathCode">$|g_{\mathrm{A}}/g_{\mathrm{V}}|=1.22\&<font\; color="red">p</font>lusmn;0.05(\text{stat.})\&<font\; color="red">p</font>lusmn;0.10(\text{syst.})$pan>pan>pan>, which validates the sum rule to an accuracy of about 9%.