First amplitude analysis of B⁺→J/...

<p>The first amplitude analysis B⁺→J/ψφK⁺, J/ψ→μ⁺μ^-, φ→K⁺K^- events is performed in Isobar approximation using all six degrees of freedom of their decay kinematics and 3 fb^-1 of pp collision data collected at √s=7-8 TeV with the LHCb detector. A number of K^*+→φK⁺ states are observed, including K^*(1680), which is observed in this decay mode for the first time (8σ significant). A number of J/ψφ mass structures are also observed which cannot be described with $K^*+ contributions alone. A broad and significant (7.6σ) enhancement just above the kinematic threshold is best described as a D⁺_sD^*-_s cusp, but a resonant interpretation is also possible with the mass consistent with the X(4140) state, but with a much larger width than previously claimed. The J^PC is determined to be 1⁺⁺ at 5.7σ. Previously inconclusive evidence for the second peak is confirmed with a mass consistent with the 0^-+ D⁺_sD^*-_s0 cusp, however, much better described in our model as a X(4274) 1⁺⁺ resonance (6.0σ significant). The high J/ψφ mass region shows evidence for more structures of high significance, possibly two 0⁺⁺ resonances. More data and going beyond the Isobar model may be required to clarify the nature of all J/ψφ mass structures observed in this decay mode.</p>

Name thesis:degree_name

Doctor of Philosophy (PhD)

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year

2016

Author dc:creator

• Britton, Thomas

Contributors dc:contributor

• Tomasz Skwarnicki

• experimental
• High energy
• Physical Sciences and Mathematics

Repository record dc:identifier

https://surface.syr.edu/etd/510

OAI identifier oai:identifier

oai:surface.syr.edu:etd-1510