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Observation of Reso...
Observation of Resonance Structures in e(+) e(-) -> pi(+) pi(- )psi(2)(3823) and Mass Measurement of psi(2)(3823)
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- Ablikim, M. (författare)
- Inst High Energy Phys, Beijing 100049, Peoples R China
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- Adlarson, Patrik (författare)
- Uppsala universitet,Kärnfysik
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- Johansson, Tord (författare)
- Uppsala universitet,Kärnfysik
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- Kupsc, Andrzej (författare)
- Uppsala universitet,Kärnfysik,Natl Ctr Nucl Res, PL-02093 Warsaw, Poland
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- Schönning, Karin, 1978- (författare)
- Uppsala universitet,Kärnfysik
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- Thorén, Viktor (författare)
- Uppsala universitet,Kärnfysik
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- Wolke, Magnus (författare)
- Uppsala universitet,Kärnfysik
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- Zou, J. H. (författare)
- Inst High Energy Phys, Beijing 100049, Peoples R China
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(creator_code:org_t)
- American Physical Society, 2022
- 2022
- Engelska.
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Ingår i: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 129:10
- Relaterad länk:
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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
Ämnesord
Stäng
- Using a data sample corresponding to an integrated luminosity of 11.3 fb(-1) collected at center-of-mass energies from 4.23 to 4.70 GeV with the BESIII detector, we measure the product of the e(+) e(-) -> pi(+) pi(-) psi(2)(3823) cross section and the branching fraction B[psi(2) (3823) -> gamma chi(c1)]. For the first time, resonance structure is observed in the cross section line shape of e(+) e(-) -> pi(+) pi(-) psi(2)(3823) with significances exceeding 5 sigma. A fit to data with two coherent Breit-Wigner resonances modeling the root s-dependent cross section yields M(R-1) = 4406.9 +/- 17.2 +/- 4.5 MeV/c(2), Gamma(R-1) = 128.1 +/- 37.2 +/- 2.3 MeV, and M(R-2) = 4647.9 +/- 8.6 +/- 0.8 MeV/c2, Gamma(R-2) = 33.1 +/- 18.6 +/- 4.1 MeV. Though weakly disfavored by the data, a single resonance with M(R) = 4417.5 +/- 26.2 +/- 3.5 MeV/c(2), Gamma(R) = 245 +/- 48 +/- 13 MeV is also possible to interpret data. This observation deepens our understanding of the nature of the vector charmoniumlike states. The mass of the psi(2)(3823) state is measured as (3823.12 +/- 0.43 +/- 0.13) MeV/c(2), which is the most precise measurement to date.
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
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