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Update on angle studies of the X(3872) S.K. Choi & S.L. Olsen Jan 21, 2005 Belle charmonium group video Meeting (Jan 20 in Hawaii) Preliminary!!!!!
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J PC for J ≤ 2 0 - - Violates parity 0 -+ OK ( c ” ) 0 ++ DD allowed 0 +- exotic 1 - - DD allowed 1 -+ exotic 1 ++ OK ( c1 ’ ) 1 +- OK (h c ’ ) 2 - - OK ( 2 ) 2 - + OK ( 2 ) 2 ++ DDallow’d c2 ’ ) 2 +- exotic
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can we just dismiss 1 -- ? K.Seth hep-ph/0411122: Proposes that the X(37872) is a vector glueball, i.e. ggg with small cc mixture. DD decays are not seen because ggg cq + cq is small
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1 -- 1 -- : sin 2 K K compute angles in J/ restframe D.V. Bugg hep-ph/0410168v2
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data ’ is 1 -- X(3872) is not! ’ 2 /dof = 8.9/9 X 2 /dof = 60.3/9
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J PC for J ≤ 2 0 - - Violates parity 0 -+ OK ( c ” ) 0 ++ DD allowed 0 +- exotic 1 - - DD allowed 1 -+ exotic 1 ++ OK ( c1 ’ ) 1 +- OK (h c ’ ) 2 - - OK ( 2 ) 2 - + OK ( 2 ) 2 ++ DDallow’d c2 ’ ) 2 +- exotic
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Summary Thanks to Rosner & Bugg we can learn a lot from ang. distributions with only ~50 events Rule out 0 -+, 0 ++, 1 +- and 1 -- 2 - - seems unlikely ( 2 /dof = 23/9) 1 ++ looks good –only non-exotic assignment left with J≤1 –1 ++ is favored by molecular models
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