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 JPC 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.
","abstract_html":"<p>The first amplitude analysis B<sup>+</sup>→J/ψφK<sup>+</sup>, J/ψ→μ<sup>+</sup>μ<sup>-</sup>, φ→K<sup>+</sup>K<sup>-</sup> events is performed in Isobar approximation using all six degrees of freedom of their decay kinematics and 3 fb<sup>-1</sup> of pp collision data collected at √s=7-8 TeV with the LHCb detector. A number of K<sup>*+</sup>→φK<sup>+</sup> states are observed, including K<sup>*</sup>(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<sup>*+</sup> contributions alone. A broad and significant (7.6σ) enhancement just above the kinematic threshold is best described as a D<sup>+</sup><sub>s</sub>D<sup>*-</sup><sub>s</sub> 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<sup>PC</sup> is determined to be 1<sup>++</sup> at 5.7σ. Previously inconclusive evidence for the second peak is confirmed with a mass consistent with the 0<sup>-+</sup> D<sup>+</sup><sub>s</sub>D<sup>*-</sup><sub>s0</sub> cusp, however, much better described in our model as a X(4274) 1<sup>++</sup> resonance (6.0σ significant). The high J/ψφ mass region shows evidence for more structures of high significance, possibly two 0<sup>++</sup> 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>","abstract_has_math":false,"creators":["Britton, Thomas"],"institution":null,"degree_name":"Doctor of Philosophy (PhD)","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Tomasz Skwarnicki"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016-07-01T07:00:00Z","date_published":"2016-07-01T07:00:00Z","updated_at":"2026-07-24T04:55:13Z","subjects":["experimental","High energy","Physical Sciences and Mathematics"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://surface.syr.edu/etd/510","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Tomasz Skwarnicki"]},{"key":"dc:creator","label":"Author","values":["Britton, Thomas"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy (PhD)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["experimental","High energy","Physical Sciences and Mathematics"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://surface.syr.edu/etd/510"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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 JPC 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.
"]},{"key":"dc:title","label":"Title","values":["First amplitude analysis of B+→J/..."]}]}],"canonical_facts":{"dc:contributor":["Tomasz Skwarnicki"],"dc:creator":["Britton, Thomas"],"dc:description.abstract":["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 JPC 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.
"],"dc:identifier":["https://surface.syr.edu/etd/510"],"dc:subject":["experimental","High energy","Physical Sciences and Mathematics"],"dc:title":["First amplitude analysis of B+→J/..."],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Doctor of Philosophy (PhD)"]},"updated_at":"2026-07-24T04:55:13Z"}