{"id":{"repo_id":"lancaster","oai_identifier":"oai:eprints.lancs.ac.uk:84121"},"canonical_url":"https://search.dev.ndltd.org/etd/lancaster/oai:eprints.lancs.ac.uk:84121","repository":{"repo_id":"lancaster","name":"Lancaster University","base_url":"https://eprints.lancs.ac.uk/cgi/oai2"},"display":{"title":"Measurements of ψ(2S) and X(3872) → J/ψ π+π- production in pp collisions at √s = 8 TeV with the ATLAS detector","abstract":"Differential cross sections are presented for the prompt and non-prompt production of the hidden-charm states X(3872) and ψ(2S), in the decay mode J/ψπ+π −, measured using 11.4 fb−1 of pp collisions at √ s = 8 TeV by the ATLAS detector at the LHC. The ratio of cross sections X(3872)/ψ(2S) is also given, separately for prompt and non-prompt components, as well as the non-prompt fractions of X(3872) and ψ(2S). Assuming independent single effective lifetimes for non-prompt X(3872) and ψ(2S) production gives RB = Br(B→X(3872) + any)Br(X(3872)→J/ψπ+π−) Br(B→ψ(2S) + any)Br(ψ(2S)→J/ψπ+π−) = (3.95 ± 0.32(stat) ± 0.08(sys))%, while separating short and long-lived contributions, assuming that the short-lived component is due to Bc decays, gives RB = (3.57±0.33(stat)±0.11(sys))%, with the fraction of non-prompt X(3872) produced via Bc decays for pT (X(3872)) > 10 GeV being (25 ± 13(stat) ± 2(sys) ± 5(spin))%. The distributions of the dipion invariant mass in the X(3872) and ψ(2S) decays are also measured and compared to expectations.","abstract_html":"Differential cross sections are presented for the prompt and non-prompt production of the hidden-charm states X(3872) and ψ(2S), in the decay mode J/ψπ+π −, measured using 11.4 fb−1 of pp collisions at √ s = 8 TeV by the ATLAS detector at the LHC. The ratio of cross sections X(3872)/ψ(2S) is also given, separately for prompt and non-prompt components, as well as the non-prompt fractions of X(3872) and ψ(2S). Assuming independent single effective lifetimes for non-prompt X(3872) and ψ(2S) production gives RB = Br(B→X(3872) + any)Br(X(3872)→J/ψπ+π−) Br(B→ψ(2S) + any)Br(ψ(2S)→J/ψπ+π−) = (3.95 ± 0.32(stat) ± 0.08(sys))%, while separating short and long-lived contributions, assuming that the short-lived component is due to Bc decays, gives RB = (3.57±0.33(stat)±0.11(sys))%, with the fraction of non-prompt X(3872) produced via Bc decays for pT (X(3872)) > 10 GeV being (25 ± 13(stat) ± 2(sys) ± 5(spin))%. The distributions of the dipion invariant mass in the X(3872) and ψ(2S) decays are also measured and compared to expectations.","abstract_has_math":false,"creators":["Beattie, Michael","Kartvelishvili, Vakhtang"],"institution":"Lancaster University","degree_name":"Ph.D.","degree_level":"doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2016,"date_issued":"2016","date_published":"2016","updated_at":"2026-07-24T02:48:32Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Beattie, Michael","Kartvelishvili, Vakhtang"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2016"]},{"key":"dc:date.issued","label":"Date","values":["2016"]},{"key":"dc:publisher.commercial","label":"Dc Publisher Commercial","values":["Lancaster University"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Physics"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["Lancaster University"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://eprints.lancs.ac.uk/id/eprint/84121/"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["Ph.D."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://eprints.lancs.ac.uk/id/eprint/84121/1/2016beattiephd.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Differential cross sections are presented for the prompt and non-prompt production of the hidden-charm states X(3872) and ψ(2S), in the decay mode J/ψπ+π −, measured using 11.4 fb−1 of pp collisions at √ s = 8 TeV by the ATLAS detector at the LHC. The ratio of cross sections X(3872)/ψ(2S) is also given, separately for prompt and non-prompt components, as well as the non-prompt fractions of X(3872) and ψ(2S). Assuming independent single effective lifetimes for non-prompt X(3872) and ψ(2S) production gives RB = Br(B→X(3872) + any)Br(X(3872)→J/ψπ+π−) Br(B→ψ(2S) + any)Br(ψ(2S)→J/ψπ+π−) = (3.95 ± 0.32(stat) ± 0.08(sys))%, while separating short and long-lived contributions, assuming that the short-lived component is due to Bc decays, gives RB = (3.57±0.33(stat)±0.11(sys))%, with the fraction of non-prompt X(3872) produced via Bc decays for pT (X(3872)) > 10 GeV being (25 ± 13(stat) ± 2(sys) ± 5(spin))%. The distributions of the dipion invariant mass in the X(3872) and ψ(2S) decays are also measured and compared to expectations."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Measurements of ψ(2S) and X(3872) → J/ψ π+π- production in pp collisions at √s = 8 TeV with the ATLAS detector"]}]}],"canonical_facts":{"dc:creator":["Beattie, Michael","Kartvelishvili, Vakhtang"],"dc:date":["2016"],"dc:date.issued":["2016"],"dc:description.abstract":["Differential cross sections are presented for the prompt and non-prompt production of the hidden-charm states X(3872) and ψ(2S), in the decay mode J/ψπ+π −, measured using 11.4 fb−1 of pp collisions at √ s = 8 TeV by the ATLAS detector at the LHC. The ratio of cross sections X(3872)/ψ(2S) is also given, separately for prompt and non-prompt components, as well as the non-prompt fractions of X(3872) and ψ(2S). Assuming independent single effective lifetimes for non-prompt X(3872) and ψ(2S) production gives RB = Br(B→X(3872) + any)Br(X(3872)→J/ψπ+π−) Br(B→ψ(2S) + any)Br(ψ(2S)→J/ψπ+π−) = (3.95 ± 0.32(stat) ± 0.08(sys))%, while separating short and long-lived contributions, assuming that the short-lived component is due to Bc decays, gives RB = (3.57±0.33(stat)±0.11(sys))%, with the fraction of non-prompt X(3872) produced via Bc decays for pT (X(3872)) > 10 GeV being (25 ± 13(stat) ± 2(sys) ± 5(spin))%. The distributions of the dipion invariant mass in the X(3872) and ψ(2S) decays are also measured and compared to expectations."],"dc:format":["application/pdf"],"dc:identifier.uri":["https://eprints.lancs.ac.uk/id/eprint/84121/1/2016beattiephd.pdf"],"dc:publisher.commercial":["Lancaster University"],"dc:publisher.department":["Physics"],"dc:publisher.institution":["Lancaster University"],"dc:relation.isreferencedby":["https://eprints.lancs.ac.uk/id/eprint/84121/"],"dc:title":["Measurements of ψ(2S) and X(3872) → J/ψ π+π- production in pp collisions at √s = 8 TeV with the ATLAS detector"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["doctoral"],"dc:type.qualificationname":["Ph.D."]},"updated_at":"2026-07-24T02:48:32Z"}