Observation of Structures in the Processes e + e -→wΧc1 and wΧ c2

• We present measurements of the Born cross sections for the processes e(+)e(-)-> w Chi(c1) and w Chi(c1) at centerof-mass energies ffiffiffisp from 4.308 to 4.951 GeV. The measurements are performed with data samples corresponding to an integrated luminosity of 11.0 fb(- 1) collected with the BESIII detector operating at the Beijing Electron Positron Collider storage ring. Assuming the e(+)e(-)-> w Chi(c2) signals come from a single resonance, the mass and width are determined to be M = (4413.6 +/- 9.0 +/- 0.8) MeV/c(2) and Gamma = (110.5 +/- 15.0 +/- 2.9THORN MeV, respectively, which is consistent with the parameters of the wellestablished resonance.o4415THORN. In addition, we also use one single resonance to describe the ethorne-...c1 line shape and determine the mass and width to be M= (4544.2 +/- 18.7 +/- 1.7)MeV=c2 and G = (116.1 +/- 33.5 +/- 1.7) MeV, respectively. The structure of this line shape, observed for the first time, requires further understanding.

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)

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