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Precision Measurement of the e(+)e(-) -> Lambda(+)(c)(Lambda)over-bar(c)(-) Cross Section Near Threshold
Inst High Energy Phys, Beijing 100049, Peoples R China.
GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia;Novosibirsk State Univ, Novosibirsk 630090, Russia.
Helmholtz Inst Mainz, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany.
Bochum Ruhr Univ, D-44780 Bochum, Germany.
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2018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, no 13, article id 132001Article in journal (Refereed) Published
Abstract [en]

The cross section of the e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (-)(c) process is measured with unprecedented precision using data collected with the BESIII detector at root s = 4574.5, 4580.0, 4590.0 and 4599.5 MeV. The nonzero cross section near the Lambda(+)(c)(Lambda) over bar (-)(c) production threshold is cleared. At center-of-mass energies root s = 4574.5 and 4599.5 MeV, the higher statistics data enable us to measure the Lambda(c) polar angle distributions. From these, the.c electric over magnetic form-factor ratios (vertical bar G(E)/G(M)vertical bar) are measured for the first time. They are found to be 1.14 +/- 0.14 +/- 0.07 and 1.23 +/- 0.05 +/- 0.03, respectively, where the first uncertainties are statistical and the second are systematic.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 120, no 13, article id 132001
National Category
Subatomic Physics
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URN: urn:nbn:se:uu:diva-354342DOI: 10.1103/PhysRevLett.120.132001ISI: 000428653700003OAI: oai:DiVA.org:uu-354342DiVA, id: diva2:1237579
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Swedish Research CouncilAvailable from: 2018-08-09 Created: 2018-08-09 Last updated: 2018-08-09Bibliographically approved

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