Measurement of initial-state–final-state radiation interference in the processese+e−→μ+μ−γande+e−→π+π−γ

6533b870fe1ef96bd12d03a7

RESEARCH PRODUCT

Measurement of initial-state–final-state radiation interference in the processese+e−→μ+μ−γande+e−→π+π−γ

W. T. Ford Tim Adye R. D. Kass Peter S. Kim B. Bhuyan A. Adametz U. Uwer B. Oberhof M. J. Lewczuk C. Bünger Corrado Angelini Stephen Sekula Roger Barlow Martino Margoni E. P. Solodov T. S. Miyashita A. Oyanguren Bruce Schumm J. L. Ritchie D. Lopes Pegna S. I. Serednyakov B. G. Fulsom E. A. Kravchenko Yu. I. Skovpen Marcello Rotondo B. N. Ratcliff T. S. Mattison J. Va’vra G. Lynch R. Cenci A. Khan C. Bozzi K. Honscheid J. Kim A. Jawahery G. Cibinetto L. M. Cremaldi Crisostomo Sciacca D. Aston C. Hast A. Zallo I. M. Peruzzi P. Taras D. Gamba F. De Mori Y. B. Pan R. Kowalewski N. Tasneem M. Carpinelli M. Fritsch G. De Nardo R. Y. So V. Prasad D. J. Lange G. Piredda W. Panduro Vazquez M. Posocco Gabriele Simi M. J. Lee N. Guttman C. L. Davis B. Stugu Andrei Gritsan Heiko Lacker Eleonora Luppi M. Röhrken R. Andreassen M. K. Sullivan H. H. F. Choi M. Ebert D. G. Hitlin F. Palombo S. Bettarini C. Voß H. W. Wulsin G. Marchiori J. Ocariz M. Gaspero Abner Soffer George Lafferty Aidan Randle-conde B. Hamilton V. E. Blinov S. Emery M. Hess A. M. Rossi M. Bellis J. P. Coleman F. Bianchi C. Cartaro A. Stocchi M. Franco Sevilla Joseph Izen J. W. Gary Nicola Neri Matteo Rama G. P. Dubois-felsmann Denis Derkach R. Calabrese S. H. Robertson Maria Roberta Monge James G. Smith S. Dittrich R. Cheaib S. Prell J. A. Mckenna F. Forti E. Paoloni K. R. Schubert B. Spaan Elisa Manoni Herbert Koch D. Su P. Roudeau James H Cochran Giulia Casarosa G. Wormser V. Poireau R. Ayad S. Martellotti P. Ongmongkolkul S. Playfer M. Piccolo W. Gradl Alessandro Pilloni D. R. Peimer James R. Wilson H. Briand E. Grauges L. Lanceri J. M. Roney Mario Giorgi J. M. Losecco J. R. Fry R. Cowan R. Faccini F. Ferrarotto A. J. Lankford F. Le Diberder Oliver Grünberg J. Chauveau J. J. Walsh G. Rizzo K. Griessinger G. Batignani R. C. Field J. D. Richman A. M. Lutz C. H. Cheng W. J. Wisniewski T. Schroeder Sridhara Dasu Bogdan Malaescu G. Finocchiaro V. Luth V. P. Druzhinin R. Contri M. T. Graham Brian Meadows M. S. Alam R. De Sangro S. L. Wu Christopher West D. J. Bard W. Dunwoodie A. Snyder G. J. King G. A. Cowan G. Eigen Alberto Lusiani Colin Jessop R. Prepost W. H. Toki S. Passaggio T. M. Hong F. Di Lodovico H. A. Neal K. Yu. Todyshev C. Hearty D. J. Payne R. Godang E. O. Olaiya Z. C. Huard Biplab Dey A. M. Eisner B. Echenard V. B. Golubev Maurizio Biasini Florian Urs Bernlochner T. Lueck Fergus Wilson D. Bernard I. M. Nugent R. F. Schwitters X. C. Lou A. Palano Owen Rosser Long A. Seiden James D. Olsen D. J. Summers A. R. Buzykaev F. Anulli G. Vasseur Timothy Gershon K. T. Flood M. V. Purohit J. Albert A. Beaulieu C. Touramanis J. A. Ernst L. T. Kerth S. Luitz J. Dorfan A. P. Onuchin D. N. Brown R. Stroili Dmytro Kovalskyi Marcin Chrzaszcz David Hutchcroft L. Sun J. P. Lees P. Patteri B. G. Pushpawela Adrian John Bevan Ph Leruste N. Arnaud G. R. Bonneaud D. W. G. S. Leith G. Calderini R. J. Sobie L. Vitale D. S. Chao F. Martinez-vidal Dominik Müller V. Santoro M. Davier A. Roodman E. Fioravanti T. Pulliam Roland Waldi F. Ferroni A. Calcaterra H. Ahmed Marco Bomben F. Simonetto R. H. Schindler Douglas Wright Paul Fraser Harrison P. M. Patel Stephen Robert Wagner E. Ben-haim A. G. Denig Yu. G. Kolomensky T. Leddig H. R. Band W. S. Lockman Simon Akar G. Onorato A. Filippi G. Raven M. D. Sokoloff P. R. Burchat R. Gorodeisky M. Simard D. A. Roberts G. Grosdidier A. Hafner E. M. T. Puccio D. B. Macfarlane R. Sacco A. J.s. Smith M. R. Convery Lianqi Wang Mauro Morandin C. H. Chen S. M. Spanier M. Verderi U. Mallik D. Bettoni I. Garzia Thomas Latham C. Patrignani V. Tisserand Sw. Banerjee L. Piemontese E. Gabathuler W. R. Innes F. C. Porter

subject

Physics Nuclear and High Energy Physics Photon 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Electron–positron annihilation media_common.quotation_subject Resonance Radiation 01 natural sciences Asymmetry Initial and final state radiation Nuclear physics 0103 physical sciences Pi High Energy Physics::Experiment Invariant mass Atomic physics 010306 general physics media_common

description

Charge asymmetry in processes e+ e- --> mu+ mu- gamma and e+ e- --> pi+ pi- gamma is measured using 232 fb-1 of data collected with the BABAR detector at center-of-mass energies near 10.58 GeV. An observable is introduced and shown to be very robust against detector asymmetries while keeping a large sensitivity to the physical charge asymmetry that results from the interference between initial and final state radiation. The asymmetry is determined as afunction of the invariant mass of the final-state tracks from production threshold to a few GeV/c2. It is compared to the expectation from QED for e+ e- --> mu+ mu- gamma and from theoretical models for e+ e- --> pi+ pi- gamma. A clear interference pattern is observed in e+ e- --> pi+ pi- gamma, particularly in the vicinity of the f_2(1270) resonance. The inferred rate of lowest order FSR production is consistent with the QED expectation for e+ e- --> mu+ mu- gamma, and is negligibly small for e+ e- --> pi+ pi- gamma.

year	journal	country	edition	language
2015-10-28	Physical Review D

https://doi.org/10.1103/physrevd.92.072015