The resonance parameters of the charmonium ground state, η c(1 1S 0), have been measured by means of the reaction p̄p→η c→γγ. The mass and total width are determined to be 2984.1 ± 2.1 ± 1.0 MeV/c 2 and 20.4 -6.7 +7.7 ± 2.0 MeV, respectively. The product of branching ratios B(p̄p→η c)B(η c→γγ) is determined to be (22.4 -3.7 +3.8 ± 2.0) × 10 -8, from which B(η c→γγ)=(1.87 -0.31-0.50 +0.32+0.95) × 10 -4, and Γ(η c→γγ)=3.8 -1.0-1.0 +1.1+1.9 keV are derived using B(η c→p̄p)= (12 ± 4) × 10 -4 from the literature.
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Titolo: | Measurement of the resonance parameters of the charmonium ground state, |
Autori: | |
Data di pubblicazione: | 2003 |
Rivista: | |
Citazione: | Measurement of the resonance parameters of the charmonium ground state, / M Ambrogiani;M Andreotti;S Argirò;S Bagnasco;W Baldini;D Bettoni;G Borreani;A Buzzo;R Calabrese;R Cester;G Cibinetto;P Dalpiaz;X Fan;G Garzoglio;K.E Gollwitzer;M Graham;A Hahn;S Jin;D Joffe;J Kasper;G Lasio;M Lo Vetere;E Luppi;P Maas;M Macrı̀;M Mandelkern;F Marchetto;M Marinelli;W Marsh;M Martini;E Menichetti;Z Metreveli;R Mussa;M Negrini;M.M Obertino;M Pallavicini;N Pastrone;C Patrignani;T.K Pedlar;J Peoples;S Pordes;E Robutti;W Roethel;J Rosen;P Rumerio;R Rusack;A Santroni;M Savriè;J Schultz;S.H Seo;K.K Seth;G Stancari;M Stancari;J Streets;A Tomaradze;I Uman;T Vidnovic;S Werkema;G Zioulas. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 566(2003), pp. 45-50. |
Abstract: | The resonance parameters of the charmonium ground state, η c(1 1S 0), have been measured by means of the reaction p̄p→η c→γγ. The mass and total width are determined to be 2984.1 ± 2.1 ± 1.0 MeV/c 2 and 20.4 -6.7 +7.7 ± 2.0 MeV, respectively. The product of branching ratios B(p̄p→η c)B(η c→γγ) is determined to be (22.4 -3.7 +3.8 ± 2.0) × 10 -8, from which B(η c→γγ)=(1.87 -0.31-0.50 +0.32+0.95) × 10 -4, and Γ(η c→γγ)=3.8 -1.0-1.0 +1.1+1.9 keV are derived using B(η c→p̄p)= (12 ± 4) × 10 -4 from the literature. |
Handle: | http://hdl.handle.net/11567/380394 |
Appare nelle tipologie: | 01.01 - Articolo su rivista |
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