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Observation of an exotic S = +1 baryon in exclusive photoproduction from the deuteron |
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| Authors: | Stepanyan S Hicks K Carman D S Pasyuk E Schumacher R A Smith E S Tedeschi D J Todor L Adams G Ambrozewicz P Anciant E Anghinolfi M Asavapibhop B Audit G Avakian H Bagdasaryan H Ball J P Barrow S P Battaglieri M Beard K Bektasoglu M Bellis M Berman B L Bianchi N Biselli A S Boiarinov S Bouchigny S Bradford R Branford D Briscoe W J Brooks W K Burkert V D Butuceanu C Calarco J R Carnahan B Chen S Ciciani L Cole P L Coleman A Cords D Corvisiero P Crabb D Crannell H Cummings J P De Sanctis E Degtyarenko P V Denizli H Dennis L De Vita R Dharmawardane K V Dhuga K S Djalali C Dodge G E Doughty D |
| Institution: | Thomas Jefferson National Accelerator Laboratory, Newport News, Virginia 23606, USA and Old Dominion University, Norfolk, Virginia 23529, USA. |
| Abstract: | In an exclusive measurement of the reaction gammad-->K(+)K(-)pn, a narrow peak that can be attributed to an exotic baryon with strangeness S=+1 is seen in the K(+)n invariant mass spectrum. The peak is at 1.542+/-0.005 GeV/c(2) with a measured width of 0.021 GeV/c(2) FWHM, which is largely determined by experimental mass resolution. The statistical significance of the peak is (5.2+/-0.6)sigma. The mass and width of the observed peak are consistent with recent reports of a narrow S=+1 baryon by other experimental groups. |
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