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Title: Precision measurements of the total and partial widths of the psi(2S) charmonium meson with a new complementary-scan technique in anti-p p annihilations

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 {bar p}p {yields} e{sup +}e{sup -} and {bar p}p {yields} J/{Psi} + X {yields} e{sup +}e{sup -} + X, we measure the width {Gamma} = 290 {+-} 25(sta) {+-} 4(sys) keV and the combination of partial widths {Gamma}{sub e{sup +}e{sup -}}{Gamma}{sub {bar p}p}/{Gamma} = 579 {+-} 38(sta) {+-} 36(sys) meV, which represent the most precise measurements to date.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
901394
Report Number(s):
FERMILAB-PUB-07-058-E
arXiv eprint number hep-ex/0703012; TRN: US0702578
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; ANTIPROTON BEAMS; ANTIPROTONS; CHARMONIUM; EXCITATION; FERMILAB; LATTICE PARAMETERS; MESONS; TANKS; Experiment-HEP

Citation Formats

Andreotti, M., Bagnasco, S., Baldini, W., Bettoni, D., Borreani, G., Buzzo, A., Calabrese, R., Cester, R., Cibinetto, G., Dalpiaz, P., and Garzoglio, G. Precision measurements of the total and partial widths of the psi(2S) charmonium meson with a new complementary-scan technique in anti-p p annihilations. United States: N. p., 2007. Web.
Andreotti, M., Bagnasco, S., Baldini, W., Bettoni, D., Borreani, G., Buzzo, A., Calabrese, R., Cester, R., Cibinetto, G., Dalpiaz, P., & Garzoglio, G. Precision measurements of the total and partial widths of the psi(2S) charmonium meson with a new complementary-scan technique in anti-p p annihilations. United States.
Andreotti, M., Bagnasco, S., Baldini, W., Bettoni, D., Borreani, G., Buzzo, A., Calabrese, R., Cester, R., Cibinetto, G., Dalpiaz, P., and Garzoglio, G. Thu . "Precision measurements of the total and partial widths of the psi(2S) charmonium meson with a new complementary-scan technique in anti-p p annihilations". United States. doi:. https://www.osti.gov/servlets/purl/901394.
@article{osti_901394,
title = {Precision measurements of the total and partial widths of the psi(2S) charmonium meson with a new complementary-scan technique in anti-p p annihilations},
author = {Andreotti, M. and Bagnasco, S. and Baldini, W. and Bettoni, D. and Borreani, G. and Buzzo, A. and Calabrese, R. and Cester, R. and Cibinetto, G. and Dalpiaz, P. and Garzoglio, G.},
abstractNote = {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 {bar p}p {yields} e{sup +}e{sup -} and {bar p}p {yields} J/{Psi} + X {yields} e{sup +}e{sup -} + X, we measure the width {Gamma} = 290 {+-} 25(sta) {+-} 4(sys) keV and the combination of partial widths {Gamma}{sub e{sup +}e{sup -}}{Gamma}{sub {bar p}p}/{Gamma} = 579 {+-} 38(sta) {+-} 36(sys) meV, which represent the most precise measurements to date.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Mar 01 00:00:00 EST 2007},
month = {Thu Mar 01 00:00:00 EST 2007}
}