Search: (WFRF:(Wang Chen)) pers:(Gu Y. T.) pers:(Liu Feng)
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Observation of a ne...
Observation of a near-threshold enhancement in the Λλ mass spectrum from e+e- → Φ Λλ at √s is from 3.51 to 4.60 GeV
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- Ablikim, M. (author)
- Inst High Energy Phys, Beijing 100049, Peoples R China
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- Adlarson, Patrik (author)
- Uppsala universitet,Kärnfysik
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- Ikegami Andersson, Walter (author)
- Uppsala universitet,Institutionen för fysik och astronomi
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- Johansson, Tord (author)
- Uppsala universitet,Kärnfysik
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- Kupsc, Andrzej (author)
- Uppsala universitet,Kärnfysik
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- Pettersson, Joachim (author)
- Uppsala universitet,Kärnfysik
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- Schönning, Karin, 1978- (author)
- Uppsala universitet,Kärnfysik
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- Thorén, Viktor (author)
- Uppsala universitet,Kärnfysik
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- Wolke, Magnus (author)
- Uppsala universitet,Kärnfysik
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- Zou, J. H. (author)
- Inst High Energy Phys, Beijing 100049, Peoples R China
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(creator_code:org_t)
- American Physical Society, 2021
- 2021
- English.
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In: Physical Review D. - : American Physical Society. - 2470-0010 .- 2470-0029. ; 104:5
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- The process e(+)e(-) -> phi Lambda(Lambda) over bar is studied using data samples collected with the BESIII detector at the BEPCII Collider at center of mass energies root S ranging from 3.51 GeV to 4.60 GeV. An enhancement is observed near the threshold of Lambda(Lambda) over bar. The lineshape of this enhancement is studied in different approaches, including fit with a Breit-Wiper function or a reversed exponential function. The Breit-Wigner function has a mass of (2262 +/- 4 +/- 28) McV/c(2) and a width of (72 +/- 5 +/- 43) MeV, where the quoted uncertainties are statistical and systematic, respectively. The rising rate of the reversed exponential function is measured as 33 +/- 11 +/- 6 MeV/c(2). For the Lambda(Lambda) over bar system, the J(PC) quantum numbers of 0(-+) and 0(+)(+) are rejected, while other J(PC) hypotheses are possible, according to the helicity-angle study. The energy-dependent cross section of the e(+)e(-) -> phi Lambda(Lambda) over bar process is measured for the first time in this energy region, and contributions from excited psi states and vector charmoniumlike Y-states are investigated.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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