Multi-Photon Production in e + e − Collisions at √ s = 181 − 209 GeV The OPAL Collaboration
Multi-Photon Production in e + e − Collisions at √ s = 181 − 209 GeV The OPAL Collaboration
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e + e − √ s = 181 − 209 GeV 碰撞中的多光子产生 OPAL 合作
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
L. Živković
中科院分区：
文献类型：
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作者：
F. Loebinger;G. Abbiendi;C. Ainsley;P. Åkesson;G. Alexander;J. Allison;P. Amaral;G. Anagnostou;K. Anderson;S. Arcelli;S. Asai;D. Axen;G. Azuelos;I. Bailey;E. Barberio;R. Barlow;R. Batley;P. Bechtle;T. Behnke;K. Bell;P. Bell;G. Bella;A. Bellerive;C. Benelli;S. Bethke;O. Biebel;I. Bloodworth;O. Boeriu;P. Bock;D. Bonacorsi;M. Boutemeur;S. Braibant;L. Brigliadori;R. Brown;K. Buesser;H. Burckhart;S. Campana;R. Carnegie;B. Caron;A. Carter;J. Carter;C. Y. Chang;D. Charlton;Á. Csilling;M. Cuffiani;S. Dado;G. Dallavalle;S. Dallison;A. Roeck;E. Wolf;K. Desch;B. Dienes;M. Donkers;J. Dubbert;E. Duchovni;G. Duckeck;I. Duerdoth;E. Elfgren;E. Etzion;F. Fabbri;L. Feld;P. Ferrari;F. Fiedler;I. Fleck;M. Ford;A. Frey;A. Furtjes;P. Gagnon;J. Gary;G. Gaycken;C. Geich;G. Giacomelli;P. Giacomelli;M. Giunta;J. Goldberg;E. Gross;J. Grunhaus;M. Gruwe;P. Günther;A. Gupta;C. Hajdu;M. Hamann;G. Hanson;K. Harder;A. Harel;M. Harin;M. Hauschild;J. Hauschildt;C. Hawkes;R. Hawkings;R. J. Hemingway;C. Hensel;G. Herten;R. Heuer;J. Hill;K. Hoffman;R. Homer;D. Horvath;R. Howard;P. Hüntemeyer;P. Igo;K. Ishii;H. Jérémie;P. Jovanović;T. Junk;N. Kanaya;J. Kanzaki;G. Karapetian;D. Karlen;V. Kartvelishvili;K. Kawagoe;T. Kawamoto;R. Keeler;R. Kellogg;BW Kenndy;D. Kim;K. Klein;A. Klier;S. Kluth;T. Kobayashi;M. Kobel;S. Komamiya;L. Kormos;R. Kowalewski;T. Kramer;T. Kress;P. Krieger;J. Krogh;D. Krop;K. Krüger;M. Kupper;G. Lafferty;H. Landsman;D. Lanske;J. Layter;A. Leins;D. Lellouch;J. Letts;L. Levinson;J. Lillich;S. Lloyd;J. Lu;J. Ludwig;A. Macpherson;W. Mader;S. Marcellini;T. Marchant;A. Martin;J. Martin;G. Masetti;T. Mashim;P. Madttig;W. Mcdonald;J. McKenna;T. Mcmahon;R. McPherson;F. Meijers;P. Mendez;W. Menges;F. Merritt;H. Mes;A. Michelini;S. Mihara;G. Mikenberg;D. Miller;S. Moed;W. Mohr;Takashi Mori;A. Mutter;K. Nagai;I. Nakamura;H. Neal;R. Nisius;S. O'neale;A. Ohs;A. Okpara;M. Oreglia;S. Orito;C. Pahl;G. Pásztor;J. Pater;G. Patrick;J. Pilcher;J. Pinfold;D. Plane;B. Poli;J. Polok;O. Pooth;M. Przybycien;A. Quadt;K. Rabbertz;C. Rembser;P. Renke;H. Rick;J. Roney;S. Rosati;Y. Rozen;K. Runge;K. Sachs;T. Saeki;O. Sahr;E. Sarkisyan;A. Schaile;O. Schaile;P. Scharff;J. Schieck;T. Schörner;M. Schröder;M. Schumacher;C. Schwick;W. Scott;R. Seuster;T. Shears;B. Shen;C. Shepherd;P. Sherwood;G. Siroli;A. Skuja;A. Smith;R. Sobie;S. Söldner;S. Spagnolo;F. Spanò;A. Stahl;K. Stephens;D. Strom;R. Ströhmer;S. Tarem;M. Tasevsky;Richard J. K. Taylor;R. Teuscher;M. Thomson;E. Torrence;D. Toya;P. Tran;T. Trefzger;A. Tricoli;I. Triggers;Z. Trocsanyi;E. Tsur;M. F. Turner;I. Ueda;B. Ujvari;B. Vachon;C. Vollmer;P. Vannerem;M. Verzocchi;H. Voss;J. Vossebeld;D. Waller;C. Ward;Ward;P. Watkins;A. Watson;N. Watson;P. Wellss;T. Wengler;N. Wermes;D. Wetterling;G. Wilson;J. Wilson;G. Wolf;T. Wyatt;S. Yamashita;D. Zer;L. Živković
利用1997年至2000年LEP OPAL探测器收集的数据研究了e + e − → γγ（γ）过程。该数据集对应于质心能量在181 GeV和209 GeV之间的积分光度为672.3 pb − 1。总截面和微分截面的确定和发现是在良好的协议与QED的预测。对观测到的角分布的拟合被用来对标准模型之外的几个物理模型的参数设置限制，例如截止参数，e + e − γγ类型的接触相互作用，额外空间维度中的引力和激发电子。在最终状态有三个光子的事件中，研究了光子对的质谱。没有发现窄共振X → γγ，限制在X γ产生截面和分支比的乘积上。
The process e + e − → γγ ( γ ) is studied using data collected by the OPAL detector at LEP between the years 1997 and 2000. The data set corresponds to an integrated luminosity of 672.3 pb − 1 at centre-of-mass energies lying between 181 GeV and 209 GeV. Total and differential cross-sections are determined and found to be in good agreement with the predictions of QED. Fits to the observed angular distributions are used to set limits on parameters from several models of physics beyond the Standard Model such as cut-off parameters, contact interactions of the type e + e − γγ , gravity in extra spatial dimensions and excited electrons. In events with three photons in the final state the mass spectrum of photon pairs is investigated. No narrow resonance X → γγ is found and limits are placed on the product of the X γ production cross-section and branching ratio.