skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: a{sub 0}{sup +} (980)-resonance production in the reaction pp {sup {yields}} d{pi}{sup +}{eta} close to the KK-bar threshold

Abstract

The reaction pp {sup {yields}} d{pi}{sup +}{eta} has been measured at a beam energy of T{sub p} = 2.65 GeV (p{sub p} = 3.46 GeV/c) using the ANKE spectrometer at COSY-Julich. The missing-mass distribution of the detected d{pi}{sup +} pairs exhibits a peak around the {eta} mass on top of a strong background of multipion pp {sup {yields}} d{pi}{sup +}(n{pi}) events. The differential cross section d{sup 4}{sigma}/d{omega}{sub d}d{omega}{sub {pi}}{sup +}dp{sub d}dp{sub {pi}}{sup +} for the reaction pp {sup {yields}} d{pi}{sup +}{eta} has been determined model independently for two regions of phase space. Employing a dynamical model for the a{sub 0}{sup +} production allows one then to deduce a total cross section of {sigma}(pp {sup {yields}} da{sub 0}{sup +} {sup {yields}} d{pi}{sup +}{eta}) = 1.1 {+-} 0.3{sub stat} {+-} 0.7{sub syst} {mu}b for the production of {pi}{sup +}{eta} via the scalar a{sub 0}{sup +}(980) resonance and {sigma}(pp {sup {yields}} d{pi}{sup +}{eta}) = 3.5 {+-} 0.3{sub stat} {+-} 1.0{sub syst} {mu}b for the nonresonant production. Using the same model as for the interpretation of recent results from ANKE for the reaction pp{yields}dK{sup +}K-bar{sup 0}, the ratio of the total cross sections is {sigma}(pp{yields}d(K{sup +}K-bar{sup 0}){sub L=0})/{sigma}(pp{yields}da{sub 0}{sup +}{yields}d{pi}{sup +}{eta})=0.029= {+-}0.008{sub stat}{+-}0.009{sub syst},more » which is in agreement with branching ratios in the literature.« less

Authors:
;  [1];  [2];  [1];  [3]; ; ;  [1];  [4];  [1];  [2];  [5];  [2];  [1];  [6];  [5]; ; ; ;  [1]
  1. Forschungszentrum Juelich, Institut fuer Kemphysik (Germany)
  2. Institute for Theoretical and Experimental Physics (Russian Federation)
  3. Russian Academy of Sciences, Institute for Nuclear Research (Russian Federation)
  4. Universitaet zu Koeln, Institut fuer Kemphysik (Germany)
  5. Petersburg Nuclear Physics Institute (Russian Federation)
  6. Joint Institute for Nuclear Research (Russian Federation)
Publication Date:
OSTI Identifier:
21076112
Resource Type:
Journal Article
Journal Name:
Physics of Atomic Nuclei
Additional Journal Information:
Journal Volume: 69; Journal Issue: 2; Other Information: DOI: 10.1134/S1063778806020153; Copyright (c) 2006 Nauka/Interperiodica; Article Copyright (c) 2006 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7788
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BEAMS; BRANCHING RATIO; COSY STORAGE RING; DIFFERENTIAL CROSS SECTIONS; DISTRIBUTION; GEV RANGE 01-10; MISSING MASS; PARTICLE DECAY; PARTICLE PRODUCTION; PHASE SPACE; PIONS PLUS; PROTON BEAMS; PROTON-PROTON INTERACTIONS; RESONANCE; SPECTROMETERS; TOTAL CROSS SECTIONS

Citation Formats

Fedorets, P V, Buescher, M, Chernyshev, V P, Dymov, S N, Grishina, V Yu, Hanhart, C, Hartmann, M, Hejny, V, Kleber, V, Koch, H R, Kondratyuk, L A, Koptev, V P, Kudryavtsev, A E, Kulessa, P, Merzliakov, S I, Mikirtychiants, S M, Nekipelov, M E, Ohm, H, Schleichert, R, and Stroeher, H. a{sub 0}{sup +} (980)-resonance production in the reaction pp {sup {yields}} d{pi}{sup +}{eta} close to the KK-bar threshold. United States: N. p., 2006. Web. doi:10.1134/S1063778806020153.
Fedorets, P V, Buescher, M, Chernyshev, V P, Dymov, S N, Grishina, V Yu, Hanhart, C, Hartmann, M, Hejny, V, Kleber, V, Koch, H R, Kondratyuk, L A, Koptev, V P, Kudryavtsev, A E, Kulessa, P, Merzliakov, S I, Mikirtychiants, S M, Nekipelov, M E, Ohm, H, Schleichert, R, & Stroeher, H. a{sub 0}{sup +} (980)-resonance production in the reaction pp {sup {yields}} d{pi}{sup +}{eta} close to the KK-bar threshold. United States. https://doi.org/10.1134/S1063778806020153
Fedorets, P V, Buescher, M, Chernyshev, V P, Dymov, S N, Grishina, V Yu, Hanhart, C, Hartmann, M, Hejny, V, Kleber, V, Koch, H R, Kondratyuk, L A, Koptev, V P, Kudryavtsev, A E, Kulessa, P, Merzliakov, S I, Mikirtychiants, S M, Nekipelov, M E, Ohm, H, Schleichert, R, and Stroeher, H. Wed . "a{sub 0}{sup +} (980)-resonance production in the reaction pp {sup {yields}} d{pi}{sup +}{eta} close to the KK-bar threshold". United States. https://doi.org/10.1134/S1063778806020153.
@article{osti_21076112,
title = {a{sub 0}{sup +} (980)-resonance production in the reaction pp {sup {yields}} d{pi}{sup +}{eta} close to the KK-bar threshold},
author = {Fedorets, P V and Buescher, M and Chernyshev, V P and Dymov, S N and Grishina, V Yu and Hanhart, C and Hartmann, M and Hejny, V and Kleber, V and Koch, H R and Kondratyuk, L A and Koptev, V P and Kudryavtsev, A E and Kulessa, P and Merzliakov, S I and Mikirtychiants, S M and Nekipelov, M E and Ohm, H and Schleichert, R and Stroeher, H},
abstractNote = {The reaction pp {sup {yields}} d{pi}{sup +}{eta} has been measured at a beam energy of T{sub p} = 2.65 GeV (p{sub p} = 3.46 GeV/c) using the ANKE spectrometer at COSY-Julich. The missing-mass distribution of the detected d{pi}{sup +} pairs exhibits a peak around the {eta} mass on top of a strong background of multipion pp {sup {yields}} d{pi}{sup +}(n{pi}) events. The differential cross section d{sup 4}{sigma}/d{omega}{sub d}d{omega}{sub {pi}}{sup +}dp{sub d}dp{sub {pi}}{sup +} for the reaction pp {sup {yields}} d{pi}{sup +}{eta} has been determined model independently for two regions of phase space. Employing a dynamical model for the a{sub 0}{sup +} production allows one then to deduce a total cross section of {sigma}(pp {sup {yields}} da{sub 0}{sup +} {sup {yields}} d{pi}{sup +}{eta}) = 1.1 {+-} 0.3{sub stat} {+-} 0.7{sub syst} {mu}b for the production of {pi}{sup +}{eta} via the scalar a{sub 0}{sup +}(980) resonance and {sigma}(pp {sup {yields}} d{pi}{sup +}{eta}) = 3.5 {+-} 0.3{sub stat} {+-} 1.0{sub syst} {mu}b for the nonresonant production. Using the same model as for the interpretation of recent results from ANKE for the reaction pp{yields}dK{sup +}K-bar{sup 0}, the ratio of the total cross sections is {sigma}(pp{yields}d(K{sup +}K-bar{sup 0}){sub L=0})/{sigma}(pp{yields}da{sub 0}{sup +}{yields}d{pi}{sup +}{eta})=0.029= {+-}0.008{sub stat}{+-}0.009{sub syst}, which is in agreement with branching ratios in the literature.},
doi = {10.1134/S1063778806020153},
url = {https://www.osti.gov/biblio/21076112}, journal = {Physics of Atomic Nuclei},
issn = {1063-7788},
number = 2,
volume = 69,
place = {United States},
year = {2006},
month = {2}
}