9 research outputs found
Study of the process in the energy range \sqrt{s} = \mbox{1.05-2.00} GeV with the SND detector
The process is studied in the center-of-mass
energy range 1.05-2.00 GeV using data with an integrated luminosity of 94.5
pb collected by the SND detector at the VEPP-2000 collider. The
cross section is measured for the first time. It is
shown that the dominant mechanism of this reaction is the transition through
the intermediate state. The measured cross section of the
subprocess is consistent with previous
measurements in the mode. It is found, with a
significance of 5.6, that the process is not
completely described by hadronic vector-pseudoscalar intermediate states. The
cross section of this missing contribution, which can originate from radiation
processes, e. g. , is measured. It is found to be
15-20 pb in the wide energy range from 1.3 to 1.9 GeV.Comment: 10 pages, 6 figures, to be submitted to European Physical Journal
Study of the process in the energy range GeV with SND
The process is studied in
the center-of-mass energy region GeV using data with an integral
luminosity of about 35 pb collected with the SND detector at the
VEPP-2000 collider. In the energy range under study, the value of the
measured Born cross section varies from 0.7 to 18 nb. The statistical
uncertainty of the cross section is %, while the systematic uncertainty
is in the range of %. The results are consistent with previous
measurements but have better accuracy.Comment: 13 pages, 11 figure
Measurement of the neutron timelike electromagnetic form factor with the SND detector
The results of the measurement of the cross section
and effective neutron timelike form factor are presented. The data taking was
carried out in 2020-2021 at the VEPP-2000 collider in the
center-of-mass energy range from 1891 to 2007 MeV. The general purpose
nonmagnetic detector SND is used to detect neutron-antineutron events. The
event selection is performed using the time-of-flight technique. The measured
cross section is 0.4-0.6 nb. The neutron form factor in the energy range under
study varies from 0.3 to 0.2.Comment: 13 pages, 8 figure
Status of VEPP-4M collider: current activity and plans
Presented are the results of a VEPP-4M collider operation at Budker Institute of Nuclear Physics during
2004-2005 as well as the plans for the nearest future.Представлены результаты, полученные на накопителе ВЭПП-4М Института Ядерной физики им. Будкера, за период 2004-2005 г., а также планы на ближайшее будущее.Представлено результати, отримані на накопичувачі ВЕПП-4М Інституту Ядерної фізики ім. Будкера, за період 2004-2005 р., а також плани на найближче майбутн
Study of the process
The process is studied in the center-of-mass energy range 1.17–2.00 GeV using data with an integrated luminosity of 201 pb collected by the SND detector at the VEPP-2000 collider. The cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the intermediate state. Our result on the cross section is consistent with the measurement in the mode. The search for radiative processes contributing to the cross section is performed, and no significant signal is observed
Measurement of the
The process is studied with the SND detector at the VEPP-2000 collider. Basing on data with an integrated luminosity of 26.4 we measure the cross section in the center-of-mass energy range from 1.28 up to 2 GeV. The measured mass spectrum of the system indicates that the dominant mechanism of this reaction is the transition through the intermediate state. The cross section for the intermediate state is measured separately. The SND results are consistent with previous measurements in the BABAR experiment and have comparable accuracy. We study the effect of the interference between the and amplitudes. It is found that the interference gives sizable contribution to the measured cross section below 1.7 GeV