Nuclear dependence of light neutral meson production in p–A collisions at 400?GeV with NA60

R. Arnaldi; K. Banicz; K. Borer; J. Castor; B. Chaurand; W. Chen; C. Cicalò; A. Colla; P. Cortese; S. Damjanovic; A. David; A. De?Falco; A. Devaux; L. Ducroux; H. En’yo; J. Fargeix; A. Ferretti; M. Floris; A. F?rster; P. Force; N. Guettet; A. Guichard; H. Gulkanian; J. M. Heuser; P. Jarron; M. Keil; L. Kluberg; Z. Li; C. Louren?o; J. Lozano; F. Manso; P. Martins; A. Masoni; A. Neves; H. Ohnishi; C. Oppedisano; P. Parracho; P. Pillot; T. Poghosyan; G. Puddu; E. Radermacher; P. Ramalhete; P. Rosinsky; E. Scomparin; J. Seixas; S. Serci; R. Shahoyan; P. Sonderegger; H. J. Specht; R. Tieulent; A. Uras; G. Usai; R. Veenhof; H. K. W?hri

摘要

The NA60 experiment has studied low-mass muon pair production in proton–nucleus collisions with a system of Be, Cu, In, W, Pb and?U targets, using a 400?GeV proton beam at the CERN SPS. The transverse momentum spectra of the ρ/ωdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$ho /omega $$end{document} and ?documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$phi $$end{document} mesons are measured in the full pTdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$p_{mathrm {T}}$$end{document} range accessible, from pT=0documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$p_{mathrm {T}}= 0$$end{document} up to 2GeV/cdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$2 , {hbox {GeV/c}}$$end{document}. The nuclear dependence of the production cross sections of the ηdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$eta $$end{document}, ωdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$omega $$end{document} and ?documentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$phi $$end{document} mesons has been found to be consistent with the power law σpA∝Aαdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$sigma _{mathrm {pA}} propto {mathrm {A}}^lpha $$end{document}, with the αdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$lpha $$end{document} parameter increasing as a function of pTdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$p_{mathrm {T}}$$end{document} for all the particles, and an approximate hierarchy αη≈α?αωdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$lpha _eta pprox lpha _phi lpha _omega $$end{document}. The cross section ratios ση/σωdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$sigma _eta /sigma _omega $$end{document}, σρ/σωdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$sigma _ho /sigma _omega $$end{document} and σ?/σωdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$sigma _phi /sigma _omega $$end{document} have been studied as a function of the size?A of the production target, and an increase of the ηdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} egin{document}$$eta $$end{document} and ?documentclass[12pt]{minimal} usepa

机译：NA60实验已经研究了质子 - 核心碰撞中的低质量μ子生产，与CENS SP的400射线束，Cu，In，W，Pb和u靶标的系统，Cu，In，W，Pb和uPations。 ρ/ω documentClass的横向动量频率[12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amsbsy} usepackage {mathrsfs} usepackage {升级} setLength { oddsidemargin} { - 69pt} begin {document} $$ rho / oomega $$$ end {document}和？ documentclass [12pt] {minimal} usepackage {ammath} usepackage {isysym } usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsideDemargin} { - 69pt} begin {document} $$ phi $$ neg {文档} Mesons在完整的pt documentClass [12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {升级} setLength { oddsidemargin} {-69pt} begin {document} $$ p _ { mathrm {t}} $$ end {document}范围可访问，来自pt = 0 documentclass [12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amssymb} 我们epackage {amsbsy} usepackage {mathrsfs} usepackage {supmeez} setLength { oddsidemargin} { - 69pt} begin {document} $$ p _ { mathrm {t}} = 0 $$ end {document}最多2gev / c documentclass [12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { ODDSidemargin} { - 69pt} begin {document} $$ 2 ，{ hbox {gev / c}} $$ end {document}。 η documentClass的生产横截面的核依赖性[12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsidemargin} {-69pt} begin {document} $$$ eta $$ node}，ω documentclass [12pt] {minimal} usepackage {ammath} usepackage {kyysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsideDemargin} { - 69pt} begin {document} $$ oomega $$ ex {document }} and？ documentClass [12pt] {minimal} usepackage {ammath} usepackage {keysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { ODDSIDEMARGIN} { - 69pt} begin {document} $$ phi $$ end {document} ecsons已被发现与权力法σpaαaα documentclass [12pt] {minimal} usepackage {ammath}} usepackage {isysym} usepackage {amsfonts} usepackage {a mssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsidemargin} {-69pt} begin {document} $$ sigma _ { mathrm {pa}} propto { mathrm { a}} ^ alpha $$$$$$$ nocument {document}，使用α documentclass [12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsidemargin} { - 69pt} begin {document} $$ alpha $$ end {document}参数随着pt documentclass [12pt]的函数而增加，{minimal } usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsidemargin} { - 69pt} begin {document $$ p _ { mathrm {t}} $$ end {document}所有粒子，以及近似层次结构αη≈αλωΩ documentClass [12pt] {minimal} usepackage {ammath} usepackage {isysym } usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} se tlength { oddsidemargin} { - 69pt} begin {document} $$ alpha _ eta inflick alpha _ phi> alpha _ omega $$ end {document}。横截面比率Ση/ΣΩ documentClass [12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amssys} usepackage {amsbsy} usepackage {mathrsfs} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsidemargin} { - 69pt} begin {document} $$ sigma _ eta / sigma _ oomga $$$$$$$$$$$$$$$$$Σ3/ΣΩ documentClass [12pt] {minimal} usepackage { ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsideDemargin} {-69pt} begin {document} $$ sigma _ rho / sigma _ oomega $$$ end {document}和σ？ΣΩ documentclass [12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amsymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsidemargin} {-69pt} begin {document} $$ sigma _ phi / sigma _ oomga $$ end {document}已被研究作为生产目标的尺寸的函数，以及η documentclass的增加[12pt] {minimal} usepackage {ammath} usepackage {isysym} usepackage {amsfonts} usepackage {amssymb} usepackage {amsbsy} usepackage {mathrsfs} usepackage {supmeek} setLength { oddsidemargin} {-69pt} begin {document} $ $ eta $$ end {document}和？ documentclass [12pt] {minimal} umerpa

Nuclear dependence of light neutral meson production in p–A collisions at 400?GeV with NA60

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