Journal
PHYSICAL REVIEW D
Volume 84, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.84.074016
Keywords
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Funding
- National Natural Science Foundation of China [11175073, 11005129, 11035006, 11047606, 11075004, 11021092]
- Ministry of Education of China (FANEDD) [200924]
- Ministry of Education of China (DPFIHE) [20090211120029]
- Ministry of Education of China (NCET) [NCET-10-0442]
- Chinese Academy of Sciences
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Inspired by the newly observed two charged bottomoniumlike states, we consider the possible contribution from the intermediate Z(b)(10610) and Z(b)(10650) states to the Y(5S) -> Y(2S)pi(+)pi(-) decay process, which naturally explains Belle's previous observation of the anomalous Y(2S)pi(+)pi(-) production near the peak of Y(5S) at root s = 10: 87 GeV [K. F. Chen et al. (Belle Collaboration), Phys. Rev. Lett. 100, 112001 (2008)]. The resulting d Gamma(Y(5S) -> Y(2S)pi(+)pi(-))/dm(pi+pi-) and d Gamma(Y(5S) -> Y(2S)pi(+)pi(-))/dcos theta distributions agree with Belle's measurement after inclusion of these Z(b) states. This formalism also reproduces the Belle observation of the double-peak structure and its reflection in the Y(2S)pi(+) invariant mass spectrum of the Y(5S) -> Y(2S)pi(+)pi(-) decay.
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