The standard model (SM) fails to explain the variety of observed quark and lepton flavors and their masses suggesting that there might exist a more fundamental basis. If quarks and leptons are composite
particles made up of more basic constituents, a new physics
interaction in the form of a four-fermion contact interaction
arises between them. Experimentally the signal is manifest as
a deviation from the SM prediction in the high-mass tail for
the invariant mass distribution of the opposite-sign dimuon pairs.
The Large Hadron Collider (LHC) experiment at the Center for
European Nuclear Research (CERN) is built to explore new physics
possibilities from proton-proton collisions occurring at the
world's highest center-of-mass energy. This thesis
discusses in detail a search strategy for a new physics possibility
based on a left-handed current model of contact interactions.
Based on 5.3 inverse femtobarns of 2011 LHC data as collected by the Compact
Muon Solenoid (CMS) detector, exclusion lower limits at 95%
confidence level are set on the compositeness energy scale
for both destructive and constructive interferences of the new physics
with the SM Drell-Yan process. These limits form the most stringent
limits to date and exceed the current published limits significantly.
","abstract_html":"<p>The standard model (SM) fails to explain the variety of observed quark and lepton flavors and their masses suggesting that there might exist a more fundamental basis. If quarks and leptons are composite </p> <p>particles made up of more basic constituents, a new physics </p> <p>interaction in the form of a four-fermion contact interaction </p> <p>arises between them. Experimentally the signal is manifest as </p> <p>a deviation from the SM prediction in the high-mass tail for </p> <p>the invariant mass distribution of the opposite-sign dimuon pairs. </p> <p>The Large Hadron Collider (LHC) experiment at the Center for </p> <p>European Nuclear Research (CERN) is built to explore new physics </p> <p>possibilities from proton-proton collisions occurring at the </p> <p>world's highest center-of-mass energy. This thesis </p> <p>discusses in detail a search strategy for a new physics possibility </p> <p>based on a left-handed current model of contact interactions. </p> <p>Based on 5.3 inverse femtobarns of 2011 LHC data as collected by the Compact </p> <p>Muon Solenoid (CMS) detector, exclusion lower limits at 95% </p> <p>confidence level are set on the compositeness energy scale</p> <p>for both destructive and constructive interferences of the new physics </p> <p>with the SM Drell-Yan process. These limits form the most stringent </p> <p>limits to date and exceed the current published limits significantly.</p>","abstract_has_math":false,"creators":["Gollapinni, Sowjanya"],"institution":null,"degree_name":"Ph.D.","degree_level":"Open Access Dissertation","degree_discipline":"Physics and Astronomy","degree_department":null,"school":null,"contributors":["Paul E. Karchin"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-01-01T08:00:00Z","date_published":"2012-01-01T08:00:00Z","updated_at":"2026-07-24T05:59:11Z","subjects":["are quarks composite, CMS thesis, compositeness, contact interactions, quark substructure","Physics"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://digitalcommons.wayne.edu/oa_dissertations/541","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Paul E. Karchin"]},{"key":"dc:creator","label":"Author","values":["Gollapinni, Sowjanya"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2012-01-01T08:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics and Astronomy"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Open Access Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["are quarks composite, CMS thesis, compositeness, contact interactions, quark substructure","Physics"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://digitalcommons.wayne.edu/oa_dissertations/541"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The standard model (SM) fails to explain the variety of observed quark and lepton flavors and their masses suggesting that there might exist a more fundamental basis. If quarks and leptons are composite
particles made up of more basic constituents, a new physics
interaction in the form of a four-fermion contact interaction
arises between them. Experimentally the signal is manifest as
a deviation from the SM prediction in the high-mass tail for
the invariant mass distribution of the opposite-sign dimuon pairs.
The Large Hadron Collider (LHC) experiment at the Center for
European Nuclear Research (CERN) is built to explore new physics
possibilities from proton-proton collisions occurring at the
world's highest center-of-mass energy. This thesis
discusses in detail a search strategy for a new physics possibility
based on a left-handed current model of contact interactions.
Based on 5.3 inverse femtobarns of 2011 LHC data as collected by the Compact
Muon Solenoid (CMS) detector, exclusion lower limits at 95%
confidence level are set on the compositeness energy scale
for both destructive and constructive interferences of the new physics
with the SM Drell-Yan process. These limits form the most stringent
limits to date and exceed the current published limits significantly.
"]},{"key":"dc:title","label":"Title","values":["Search for contact interactions in the dimuon channel in p-p collisions at sqrt(s) = 7 tev at cms"]}]}],"canonical_facts":{"dc:contributor":["Paul E. Karchin"],"dc:creator":["Gollapinni, Sowjanya"],"dc:date.available":["2012-01-01T08:00:00Z"],"dc:description.abstract":["The standard model (SM) fails to explain the variety of observed quark and lepton flavors and their masses suggesting that there might exist a more fundamental basis. If quarks and leptons are composite
particles made up of more basic constituents, a new physics
interaction in the form of a four-fermion contact interaction
arises between them. Experimentally the signal is manifest as
a deviation from the SM prediction in the high-mass tail for
the invariant mass distribution of the opposite-sign dimuon pairs.
The Large Hadron Collider (LHC) experiment at the Center for
European Nuclear Research (CERN) is built to explore new physics
possibilities from proton-proton collisions occurring at the
world's highest center-of-mass energy. This thesis
discusses in detail a search strategy for a new physics possibility
based on a left-handed current model of contact interactions.
Based on 5.3 inverse femtobarns of 2011 LHC data as collected by the Compact
Muon Solenoid (CMS) detector, exclusion lower limits at 95%
confidence level are set on the compositeness energy scale
for both destructive and constructive interferences of the new physics
with the SM Drell-Yan process. These limits form the most stringent
limits to date and exceed the current published limits significantly.
"],"dc:identifier":["https://digitalcommons.wayne.edu/oa_dissertations/541"],"dc:subject":["are quarks composite, CMS thesis, compositeness, contact interactions, quark substructure","Physics"],"dc:title":["Search for contact interactions in the dimuon channel in p-p collisions at sqrt(s) = 7 tev at cms"],"thesis:degree_discipline":["Physics and Astronomy"],"thesis:degree_level":["Open Access Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-24T05:59:11Z"}