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26 April 2024

» arxiv » hep-ex/0703012

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Precision measurements of the total and partial widths of the psi(2S) charmonium meson with a new complementary-scan technique in antiproton-proton annihilations
Fermilab E835 Collaboration ; M. Andreotti ; S. Bagnasco ; W. Baldini ; D. Bettoni ; G. Borreani ; A. Buzzo ; R. Calabrese ; R. Cester ; G. Cibinetto ; P. Dalpiaz ; G. Garzoglio ; K. E. Gollwitzer ; M. Graham ; M. Hu ; D. Joffe ; J. Kasper ; G. Lasio ; M. Lo Vetere ; E. Luppi ; M. Macrì ; M. Mandelkern ; F. Marchetto ; M. Marinelli ; E. Menichetti ; Z. Metreveli ; R. Mussa ; M. Negrini ; M. M. Obertino ; M. Pallavicini ; N. Pastrone ; C. Patrignani ; S. Pordes ; E. Robutti ; W. Roethel ; J. Rosen ; P. Rumerio ; R. W. Rusack ; A. Santroni ; J. Schultz ; S. H. Seo ; K. K. Seth ; G. Stancari ; M. Stancari ; A. Tomaradze ; I. Uman ; T. Vidnovic ; S. Werkema ; P. Zweber ;
Date:	6 Mar 2007
Abstract:	We present new precision measurements of the psi(2S) total and partial widths from excitation curves obtained in antiproton-proton annihilations by Fermilab experiment E835 at the Antiproton Accumulator in the year 2000. A new technique of complementary scans was developed to study narrow resonances with stochastically cooled antiproton beams. It relies on precise revolution-frequency and orbit-length measurements, while making the analysis of the excitation curve almost independent of machine lattice parameters. For the psi(2S) meson, by studying the processes pbar p -> e+ e- and pbar p -> J/psi + X -> e+ e- + X, we measure the width Gamma = 290 +- 25(sta) +- 4(sys) keV and the combination of partial widths Gamma_e+e- * Gamma_pbarp / Gamma = 579 +- 38(sta) +- 36(sys) meV, which represent the most precise measurements to date.
Source:	arXiv, hep-ex/0703012
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