Resonant structure in the dipion mass spectrum produced via \\decay{\\Bu}{\\X\\Kp}, \\decay{\\X}{\\jpsi \\pip \\pim}, with \\decay{\\jpsi}{\\mu^+\\mu^-} is analyzed using Run 1 and Run 2 data samples from the LHCb experiment. The spectrum is dominated by $\\rhoz\\to\\pi^+\\pi^-$, but cannot be described by this contribution alone. A significant $\\omega\\to\\pi^+\\pi^-$ contribution, interfering with $\\rhoz$, is observed for the first time. This is a more significant observation ($>7.1\\sigma$) of $\\X\\to\\omega\\jpsi$ decays, than previously achieved with $\\omega\\to\\pi^+\\pi^-\\pi^0$ decays. The relative contribution of $\\omega$ to the total $\\X\\to\\pi^+\\pi^-\\jpsi$ rate is at the level expected from the measured $\\X\\to(\\omega\\to\\pi^+\\pi^-\\pi^0)\\jpsi$ rate, if the interference between the $\\rho^0$ and $\\omega$ amplitudes is neglected, $(1.9\\pm0.4\\pm0.3)\\%$. The interference enhances the importance of $\\omega$ contribution by an order of magnitude to $(21.4\\pm2.3\\pm2.0)\\%$. The results support interpretations of the $\\X$ state as an exotic hadron, since its isospin violating $\\rhoz\\jpsi$ decay rate, relative to isospin conserving $\\omega\\jpsi$ decay, is an order of magnitude larger than expected for an ordinary charmonium state.
","abstract_html":"<p>Resonant structure in the dipion mass spectrum produced via \\decay{\\Bu}{\\X\\Kp}, \\decay{\\X}{\\jpsi \\pip \\pim}, with \\decay{\\jpsi}{\\mu^+\\mu^-} is analyzed using Run 1 and Run 2 data samples from the LHCb experiment. The spectrum is dominated by \\rhoz\\toπ+π-, but cannot be described by this contribution alone. A significant ω\\toπ+π- contribution, interfering with $\\rhoz$, is observed for the first time. This is a more significant observation (>7.1σ) of \\X\\toω\\jpsi decays, than previously achieved with ω\\toπ+π-π0 decays. The relative contribution of ω to the total \\X\\toπ+π-\\jpsi rate is at the level expected from the measured \\X\\to(ω\\toπ+π-π0)\\jpsi rate, if the interference between the \\rho0 and ω amplitudes is neglected, $(1.9\\pm0.4\\pm0.3)\\%$. The interference enhances the importance of ω contribution by an order of magnitude to $(21.4\\pm2.3\\pm2.0)\\%$. The results support interpretations of the $\\X$ state as an exotic hadron, since its isospin violating $\\rhoz\\jpsi$ decay rate, relative to isospin conserving ω\\jpsi decay, is an order of magnitude larger than expected for an ordinary charmonium state.</p>","abstract_has_math":true,"creators":["Batsukh, Baasansuren"],"institution":null,"degree_name":"Doctor of Philosophy (PhD)","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Skwarnicki, Tomasz"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2021,"date_issued":"2021-12-22T08:00:00Z","date_published":"2021-12-22T08:00:00Z","updated_at":"2026-07-24T04:56:14Z","subjects":["Physical Sciences and Mathematics","Physics"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://surface.syr.edu/etd/1406","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Skwarnicki, Tomasz"]},{"key":"dc:creator","label":"Author","values":["Batsukh, Baasansuren"]}]},{"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":["Physical Sciences and Mathematics","Physics"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://surface.syr.edu/etd/1406"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Resonant structure in the dipion mass spectrum produced via \\decay{\\Bu}{\\X\\Kp}, \\decay{\\X}{\\jpsi \\pip \\pim}, with \\decay{\\jpsi}{\\mu^+\\mu^-} is analyzed using Run 1 and Run 2 data samples from the LHCb experiment. The spectrum is dominated by $\\rhoz\\to\\pi^+\\pi^-$, but cannot be described by this contribution alone. A significant $\\omega\\to\\pi^+\\pi^-$ contribution, interfering with $\\rhoz$, is observed for the first time. This is a more significant observation ($>7.1\\sigma$) of $\\X\\to\\omega\\jpsi$ decays, than previously achieved with $\\omega\\to\\pi^+\\pi^-\\pi^0$ decays. The relative contribution of $\\omega$ to the total $\\X\\to\\pi^+\\pi^-\\jpsi$ rate is at the level expected from the measured $\\X\\to(\\omega\\to\\pi^+\\pi^-\\pi^0)\\jpsi$ rate, if the interference between the $\\rho^0$ and $\\omega$ amplitudes is neglected, $(1.9\\pm0.4\\pm0.3)\\%$. The interference enhances the importance of $\\omega$ contribution by an order of magnitude to $(21.4\\pm2.3\\pm2.0)\\%$. The results support interpretations of the $\\X$ state as an exotic hadron, since its isospin violating $\\rhoz\\jpsi$ decay rate, relative to isospin conserving $\\omega\\jpsi$ decay, is an order of magnitude larger than expected for an ordinary charmonium state.
"]},{"key":"dc:title","label":"Title","values":["Observation of Ω Contribution in the c1(3872) → Π+π−j/ψ Decays"]}]}],"canonical_facts":{"dc:contributor":["Skwarnicki, Tomasz"],"dc:creator":["Batsukh, Baasansuren"],"dc:description.abstract":["Resonant structure in the dipion mass spectrum produced via \\decay{\\Bu}{\\X\\Kp}, \\decay{\\X}{\\jpsi \\pip \\pim}, with \\decay{\\jpsi}{\\mu^+\\mu^-} is analyzed using Run 1 and Run 2 data samples from the LHCb experiment. The spectrum is dominated by $\\rhoz\\to\\pi^+\\pi^-$, but cannot be described by this contribution alone. A significant $\\omega\\to\\pi^+\\pi^-$ contribution, interfering with $\\rhoz$, is observed for the first time. This is a more significant observation ($>7.1\\sigma$) of $\\X\\to\\omega\\jpsi$ decays, than previously achieved with $\\omega\\to\\pi^+\\pi^-\\pi^0$ decays. The relative contribution of $\\omega$ to the total $\\X\\to\\pi^+\\pi^-\\jpsi$ rate is at the level expected from the measured $\\X\\to(\\omega\\to\\pi^+\\pi^-\\pi^0)\\jpsi$ rate, if the interference between the $\\rho^0$ and $\\omega$ amplitudes is neglected, $(1.9\\pm0.4\\pm0.3)\\%$. The interference enhances the importance of $\\omega$ contribution by an order of magnitude to $(21.4\\pm2.3\\pm2.0)\\%$. The results support interpretations of the $\\X$ state as an exotic hadron, since its isospin violating $\\rhoz\\jpsi$ decay rate, relative to isospin conserving $\\omega\\jpsi$ decay, is an order of magnitude larger than expected for an ordinary charmonium state.
"],"dc:identifier":["https://surface.syr.edu/etd/1406"],"dc:subject":["Physical Sciences and Mathematics","Physics"],"dc:title":["Observation of Ω Contribution in the c1(3872) → Π+π−j/ψ Decays"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Doctor of Philosophy (PhD)"]},"updated_at":"2026-07-24T04:56:14Z"}