Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high p_T

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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 ; W. Augustyniak^ae ; A. Austregesilo^q ; C.D.R. Azevedo^b ; B. Badełek^af ; F. Balestra^ab ; ^ac ; J. Barth^e ; 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 ; M. B&uuml ; chele^j ; E. Burtin^v ; W.-C. Chang^w ; M. Chiosso^ab ; ^ac ; I. Choi^ad ; S.-U. Chung^q ; ³ ; 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 ; ^{oleg.denisov@cern.ch" class="auth_mail" title="E-mail the corresponding author} ; L. Dhara^g ; S.V. Donskov^u ; N. Doshita^ah ; V. Duic^y ; W. D&uuml ; nnweber⁴ ; M. Dziewiecki^ag ; A. Efremov^h ; P.D. Eversheim^d ; W. Eyrichⁱ ; M. Faessler⁴ ; 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. Grabm&uuml ; 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 ; ⁵ ; N. d'Hose^v ; C.-Y. Hsieh^w ; S. Huber^q ; S. Ishimoto^ah ; ⁶ ; A. Ivanov^ab ; ^ac ; Yu. Ivanshin^h ; T. Iwata^ah ; R. Jahn^d ; V. Jary^t ; R. Joosten^d ; P. J&ouml ; rg^j ; E. Kabuß ; ⁿ ; B. Ketzer^d ; ^q ; G.V. Khaustov^u ; Yu.A. Khokhlov^u ; ⁷ ; ⁸ ; Yu. Kisselev^h ; F. Klein^e ; K. Klimaszewski^ae ; J.H. Koivuniemi^c ; V.N. Kolosov^u ; K. Kondo^ah ; K. K&ouml ; nigsmann^j ; I. Konorov^p ; ^q ; V.F. Konstantinov^u ; A.M. Kotzinian^ab ; ^ac ; O. Kouznetsov^h ; M. Kr&auml ; mer^q ; P. Kremser^j ; F. Krinner^q ; Z.V. Kroumchtein^h ; N. Kuchinski^h ; R. Kuhn^q ; ⁹ ; F. Kunne^v ; 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 ; ^{gerhard.mallot@cern.ch" class="auth_mail" title="E-mail the corresponding author} ; C. Marchand^v ; ^{claude.marchand@cea.fr" class="auth_mail" title="E-mail the corresponding author} ; B. Marianski^ae ; A. Martin^y ; ^z ; J. Marzec^ag ; J. Matou&scaron ; ek^s ; H. Matsuda^ah ; T. Matsuda^o ; G. Meshcheryakov^h ; W. Meyer^c ; T. Michigami^ah ; Yu.V. Mikhailov^u ; Y. Miyachi^ah ; P. Montuenga^ad ; A. Nagaytsev^h ; F. Nerlingⁿ ; D. Neyret^v ; V.I. Nikolaenko^u ; J. Nový ; ^t ; ^k ; W.-D. Nowak^j ; G. Nukazuka^ah ; 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. Pe&scaron ; ek^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 ; N.S. Rossiyskaya^h ; D.I. Ryabchikov^u ; ⁸ ; 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 ; ¹¹ ; H. Schmieden^e ; K. Sch&ouml ; nning^k ; ¹² ; S. Schopferer^j ; A. Selyunin^h ; O.Yu. Shevchenko^h ; ¹ ; 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 ; ⁵ ; A. Szabelski^ae ; T. Szameitat^j ; ¹¹ ; P. Sznajder^ae ; S. Takekawa^ab ; ^ac ; 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 ; J. ter Wolbeek^j ; ¹¹ ; K. Zaremba^ag ; M. Zavertyaev^p ; E. Zemlyanichkina^h ; M. Ziembicki^ag ; A. Zinkⁱ
• 关键词：COMPASS ; Deep inelastic scattering ; Double spin asymmetry ; High pTpT ; ΔG
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 February 2016
• 年：2016
• 卷：753
• 期：Complete
• 页码：573-579
• 全文大小：851 K

文摘

We measured the longitudinal double spin asymmetries mmlsi1" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009831&_mathId=si1.gif&_user=111111111&_pii=S0370269315009831&_rdoc=1&_issn=03702693&md5=d8ef50d101a6841c643ebcd2b7f8f46b" title="Click to view the MathML source">A_m>LLm>mathContainer hidden">mathCode"><math altimg="si1.gif" overflow="scroll"><msub><mrow><mi>Ami>mrow><mrow><mi mathvariant="italic">LLmi>mrow>msub>math> for single hadron muoproduction off protons and deuterons at photon virtuality mmlsi2" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009831&_mathId=si2.gif&_user=111111111&_pii=S0370269315009831&_rdoc=1&_issn=03702693&md5=a020c114387435bd81076234e466c789">mg class="imgLazyJSB inlineImage" height="16" width="103" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269315009831-si2.gif">mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><msup><mrow><mi>Qmi>mrow><mrow><mn>2mn>mrow>msup><mo><mo><mn>1mn><mspace width="0.25em">mspace><msup><mrow><mo stretchy="false">(mo><mtext>GeVmtext><mo stretchy="false">/mo><mi>cmi><mo stretchy="false">)mo>mrow><mrow><mn>2mn>mrow>msup>math> for transverse hadron momenta mmlsi3" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009831&_mathId=si3.gif&_user=111111111&_pii=S0370269315009831&_rdoc=1&_issn=03702693&md5=5e97d9bb8f65864d9c794267809e2ee9" title="Click to view the MathML source">p_TmathContainer hidden">mathCode"><math altimg="si3.gif" overflow="scroll"><msub><mrow><mi>pmi>mrow><mrow><mi>Tmi>mrow>msub>math> in the range mmlsi4" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009831&_mathId=si4.gif&_user=111111111&_pii=S0370269315009831&_rdoc=1&_issn=03702693&md5=421aa44e0629cfda44c0962cf700075d" title="Click to view the MathML source">1 GeV/cmathContainer hidden">mathCode"><math altimg="si4.gif" overflow="scroll"><mn>1mn><mtext> mtext><mtext>GeVmtext><mo stretchy="false">/mo><mi>cmi>math> to mmlsi5" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009831&_mathId=si5.gif&_user=111111111&_pii=S0370269315009831&_rdoc=1&_issn=03702693&md5=bb62ebefe48818c71f54f13e91b2d6d4" title="Click to view the MathML source">4 GeV/cmathContainer hidden">mathCode"><math altimg="si5.gif" overflow="scroll"><mn>4mn><mtext> mtext><mtext>GeVmtext><mo stretchy="false">/mo><mi>cmi>math>. They were determined using COMPASS data taken with a polarised muon beam of mmlsi6" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009831&_mathId=si6.gif&_user=111111111&_pii=S0370269315009831&_rdoc=1&_issn=03702693&md5=f2da6c912a886a68b003e2c2c8d431fa" title="Click to view the MathML source">160 GeV/cmathContainer hidden">mathCode"><math altimg="si6.gif" overflow="scroll"><mn>160mn><mtext> mtext><mtext>GeVmtext><mo stretchy="false">/mo><mi>cmi>math> or mmlsi7" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009831&_mathId=si7.gif&_user=111111111&_pii=S0370269315009831&_rdoc=1&_issn=03702693&md5=7afb10f829b49bba54d4ef703f4aa8d6" title="Click to view the MathML source">200 GeV/cmathContainer hidden">mathCode"><math altimg="si7.gif" overflow="scroll"><mn>200mn><mtext> mtext><mtext>GeVmtext><mo stretchy="false">/mo><mi>cmi>math> impinging on polarised ⁶LiD or NH₃ targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation Δm>G  m> inside the nucleon in the range of the nucleon momentum fraction carried by gluons mmlsi8" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009831&_mathId=si8.gif&_user=111111111&_pii=S0370269315009831&_rdoc=1&_issn=03702693&md5=8f7210d9b46b8709b2f07c6976818251" title="Click to view the MathML source">0.05<x_g<0.2mathContainer hidden">mathCode"><math altimg="si8.gif" overflow="scroll"><mn>0.05mn><mo><mo><msub><mrow><mi>xmi>mrow><mrow><mi>gmi>mrow>msub><mo><mo><mn>0.2mn>math>.