Experimental investigation of the two-photon widths of the chi(c0) and the chi(c2) mesons

B I Eisenstein; J Ernst; G E Gladding; G D Gollin; R M Hans; E Johnson; I Karliner; M A Marsh; C Plager; C Sedlack; M Selen; J J Thaler; J Williams; K W Edwards; A J Sadoff; R Ammar; A Bean; D Besson; X Zhao; S Anderson; V V Frolov; Y Kubota; S J Lee; R Poling; A Smith; C J Stepaniak; J Urheim; S Ahmed; M S Alam; S B Athar; L Jian; L Ling; M Saleem; S Timm; F Wappler; A Anastassov; E Eckhart; K K Gan; C Gwon; T Hart; K Honscheid; D Hufnagel; H Kagan; R Kass; T K Pedlar; J B Thayer; E von Toerne; M M Zoeller; S J Richichi; H Severini; P Skubic; A Undrus; V Savinov; S Chen; J W Hinson; J Lee; D H Miller; E I Shibata; I P Shipsey; V Pavlunin; D Cronin-Hennessy; A L Lyon; E H Thorndike; T E Coan; V Fadeyev; Y S Gao; Y Maravin; I Narsky; R Stroynowski; J Ye; T Wlodek; M Artuso; K Benslama; C Boulahouache; K Bukin; E Dambasuren; G Majumder; R Mountain; T Skwarnicki; S Stone; J C Wang; A Wolf; S Kopp; M Kostin; A H Mahmood; S E Csorna; I Danko; K W McLean; Z Xu; R Godang; G Bonvicini; D Cinabro; M Dubrovin; S McGee; A Bornheim; E Lipeles; S P Pappas; A Shapiro; W M Sun; A J Weinstein; D E Jaffe; R Mahapatra; G Masek; H P Paar; D M Asner; A Eppich; T S Hill; R J Morrison; R A Briere; G P Chen; T Ferguson; H Vogel; J P Alexander; C Bebek; B E Berger; K Berkelman; F Blanc; V Boisvert; D G Cassel; P S Drell; J E Duboscq; K M Ecklund; R Ehrlich; P Gaidarev; R S Galik; L Gibbons; B Gittelman; S W Gray; D L Hartill; B K Heltsley; L Hsu; C D Jones; J Kandaswamy; D L Kreinick; M Lohner; A Magerkurth; H Mahlke-Krüger; T O Meyer; N B Mistry; E Nordberg; M Palmer; J R Patterson; D Peterson; D Riley; A Romano; H Schwarthoff; J G Thayer; D Urner; B Valant-Spaight; G Viehhauser; A Warburton; P Avery; C Prescott; A I Rubiera; H Stoeck; J Yelton; G Brandenburg; A Ershov; D Y Kim; R Wilson

doi:10.1103/PhysRevLett.87.061801

Experimental investigation of the two-photon widths of the chi(c0) and the chi(c2) mesons

Phys Rev Lett. 2001 Aug 6;87(6):061801. doi: 10.1103/PhysRevLett.87.061801. Epub 2001 Jul 24.

Authors

B I Eisenstein¹, J Ernst, G E Gladding, G D Gollin, R M Hans, E Johnson, I Karliner, M A Marsh, C Plager, C Sedlack, M Selen, J J Thaler, J Williams, K W Edwards, A J Sadoff, R Ammar, A Bean, D Besson, X Zhao, S Anderson, V V Frolov, Y Kubota, S J Lee, R Poling, A Smith, C J Stepaniak, J Urheim, S Ahmed, M S Alam, S B Athar, L Jian, L Ling, M Saleem, S Timm, F Wappler, A Anastassov, E Eckhart, K K Gan, C Gwon, T Hart, K Honscheid, D Hufnagel, H Kagan, R Kass, T K Pedlar, J B Thayer, E von Toerne, M M Zoeller, S J Richichi, H Severini, P Skubic, A Undrus, V Savinov, S Chen, J W Hinson, J Lee, D H Miller, E I Shibata, I P Shipsey, V Pavlunin, D Cronin-Hennessy, A L Lyon, E H Thorndike, T E Coan, V Fadeyev, Y S Gao, Y Maravin, I Narsky, R Stroynowski, J Ye, T Wlodek, M Artuso, K Benslama, C Boulahouache, K Bukin, E Dambasuren, G Majumder, R Mountain, T Skwarnicki, S Stone, J C Wang, A Wolf, S Kopp, M Kostin, A H Mahmood, S E Csorna, I Danko, K W McLean, Z Xu, R Godang, G Bonvicini, D Cinabro, M Dubrovin, S McGee, A Bornheim, E Lipeles, S P Pappas, A Shapiro, W M Sun, A J Weinstein, D E Jaffe, R Mahapatra, G Masek, H P Paar, D M Asner, A Eppich, T S Hill, R J Morrison, R A Briere, G P Chen, T Ferguson, H Vogel, J P Alexander, C Bebek, B E Berger, K Berkelman, F Blanc, V Boisvert, D G Cassel, P S Drell, J E Duboscq, K M Ecklund, R Ehrlich, P Gaidarev, R S Galik, L Gibbons, B Gittelman, S W Gray, D L Hartill, B K Heltsley, L Hsu, C D Jones, J Kandaswamy, D L Kreinick, M Lohner, A Magerkurth, H Mahlke-Krüger, T O Meyer, N B Mistry, E Nordberg, M Palmer, J R Patterson, D Peterson, D Riley, A Romano, H Schwarthoff, J G Thayer, D Urner, B Valant-Spaight, G Viehhauser, A Warburton, P Avery, C Prescott, A I Rubiera, H Stoeck, J Yelton, G Brandenburg, A Ershov, D Y Kim, R Wilson

Affiliation

¹ University of Illinois, Urbana-Champaign, Illinois 61801.

PMID: 11497821
DOI: 10.1103/PhysRevLett.87.061801

Abstract

Using 12.7 fb(-1) of data collected with the CLEO detector at CESR, we observed two-photon production of the cc states chi(c0) and chi(c2) in their decay to pi(+)pi(-)pi(+)pi(-). We measured gamma(gammagamma)(chi(c))xB(chi(c)-->pi(+)pi(-)pi(+)pi(-)) to be 75+/-13(stat)+/-8(syst) eV for the chi(c0) and 6.4+/-1.8(stat)+/-0.8(syst) eV for the chi(c2), implying gamma(gammagamma)(chi(c0)) = 3.76+/-0.65(stat)+/-0.41(syst)+/-1.69(br) keV and gamma(gammagamma)(chi(c2)) = 0.53+/-0.15(stat)+/-0.06(syst)+/-0.22(br) keV. Also, cancellation of dominant experimental and theoretical uncertainties permits a precise comparison of gamma(gammagamma)(chi(c0))/gamma(gammagamma)(chi(c2)), evaluated to be 7.4+/-2.4(stat)+/-0.5(syst)+/-0.9(br), with QCD-based predictions.