{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/16759"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/16759","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The Boer-Mulders and Cahn effects: azimuthal modulations in the spin-independent SIDIS cross section at Hermes","abstract":"The coφh and cos 2φh modulations of the spin independent semi-inclusive deep inelastic scattering cross section were measured at Hermes. These modulations are sensitive to the polarization and transverse motion of quarks within the nucleon. The Cahn effect, which contributes at subleading twist (twist-3) to cosφh and twist-4 to cos2φh, is sensitive to transverse motion of quarks. The Boer-Mulders effect, which contributes at subleading twist to cosφh and leading twist to cos2φh, requires non-zero transverse quark motion and is sensitive to quark polarization, effectively measuring the quark spin-orbit correlation. These modulations were measured in a fully differential way, as a function of x, y, z, and Ph⊥ for positive and negative pions, kaons, and unidentified-hadrons produced from hydrogen and deuterium targets at Hermes. This is the the most complete measurement to date, for the first time granting access to the flavor dependent distribution and fragmentation functions that generate these moments. These measurement would not have been possible without an improved hadron-type identification algorithm for the Ring Imaging Cherenkov (RICH) detector. The EVT event-level algorithm is presented and now is the primary method used at Hermes","abstract_html":"The coφh and cos 2φh modulations of the spin independent semi-inclusive deep inelastic scattering cross section were measured at Hermes. These modulations are sensitive to the polarization and transverse motion of quarks within the nucleon. The Cahn effect, which contributes at subleading twist (twist-3) to cosφh and twist-4 to cos2φh, is sensitive to transverse motion of quarks. The Boer-Mulders effect, which contributes at subleading twist to cosφh and leading twist to cos2φh, requires non-zero transverse quark motion and is sensitive to quark polarization, effectively measuring the quark spin-orbit correlation. These modulations were measured in a fully differential way, as a function of x, y, z, and Ph⊥ for positive and negative pions, kaons, and unidentified-hadrons produced from hydrogen and deuterium targets at Hermes. This is the the most complete measurement to date, for the first time granting access to the flavor dependent distribution and fragmentation functions that generate these moments. These measurement would not have been possible without an improved hadron-type identification algorithm for the Ring Imaging Cherenkov (RICH) detector. The EVT event-level algorithm is presented and now is the primary method used at Hermes","abstract_has_math":false,"creators":["Lamb, Rebecca M."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Makins, Naomi C.R.","Grosse Perdekamp, Matthias","Willenbrock, Scott S.","Stack, John D."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2010,"date_issued":"2010-08-20T17:57:04Z","date_published":"2010-08-20T17:57:04Z","updated_at":"2026-07-22T22:25:09Z","subjects":["Cahn effect","Boer-Mulders distribution function","azimuthal modulations","semi-inclusive deep inelastic scattering","intrinsic transverse momentum","spin"],"languages":["en"],"rights":["Copyright 2010 Rebecca M. Lamb"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/16759","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Makins, Naomi C.R.","Grosse Perdekamp, Matthias","Willenbrock, Scott S.","Stack, John D."]},{"key":"dc:creator","label":"Author","values":["Lamb, Rebecca M."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2010-08-20T17:57:04Z","2010-08"]},{"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":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Cahn effect","Boer-Mulders distribution function","azimuthal modulations","semi-inclusive deep inelastic scattering","intrinsic transverse momentum","spin"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2010 Rebecca M. Lamb"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/16759"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The coφh and cos 2φh modulations of the spin independent semi-inclusive deep inelastic scattering cross section were measured at Hermes. These modulations are sensitive to the polarization and transverse motion of quarks within the nucleon. The Cahn effect, which contributes at subleading twist (twist-3) to cosφh and twist-4 to cos2φh, is sensitive to transverse motion of quarks. The Boer-Mulders effect, which contributes at subleading twist to cosφh and leading twist to cos2φh, requires non-zero transverse quark motion and is sensitive to quark polarization, effectively measuring the quark spin-orbit correlation. These modulations were measured in a fully differential way, as a function of x, y, z, and Ph⊥ for positive and negative pions, kaons, and unidentified-hadrons produced from hydrogen and deuterium targets at Hermes. This is the the most complete measurement to date, for the first time granting access to the flavor dependent distribution and fragmentation functions that generate these moments. These measurement would not have been possible without an improved hadron-type identification algorithm for the Ring Imaging Cherenkov (RICH) detector. The EVT event-level algorithm is presented and now is the primary method used at Hermes","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-07-08T21:59:16Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 thesis_upload.zip: 15463274 bytes, checksum: 60ced59215e1b445a0d6a4c177f2c224 (MD5) Lamb_Rebecca.pdf: 7186079 bytes, checksum: 597d576c31d6d41de1ffff94dd950b13 (MD5)","Made available in DSpace on 2010-08-20T17:57:04Z (GMT). No. of bitstreams: 5 Lamb_Rebecca_v2.pdf: 7186052 bytes, checksum: 94748320339831e97043c6a0990b0dcb (MD5) Lamb_Rebecca.pdf: 7186079 bytes, checksum: 597d576c31d6d41de1ffff94dd950b13 (MD5) thesis_upload_2.zip: 15463014 bytes, checksum: 39fe738c63415191b660357a7ce6aa74 (MD5) 1_Lamb_Rebecca.pdf: 7186052 bytes, checksum: 94748320339831e97043c6a0990b0dcb (MD5) license.txt: 4060 bytes, checksum: 1031bf1fa33f00e32a74871a9aa88abe (MD5)"]},{"key":"dc:title","label":"Title","values":["The Boer-Mulders and Cahn effects: azimuthal modulations in the spin-independent SIDIS cross section at Hermes"]}]}],"canonical_facts":{"dc:contributor":["Makins, Naomi C.R.","Grosse Perdekamp, Matthias","Willenbrock, Scott S.","Stack, John D."],"dc:creator":["Lamb, Rebecca M."],"dc:date":["2010-08-20T17:57:04Z","2010-08"],"dc:description":["The coφh and cos 2φh modulations of the spin independent semi-inclusive deep inelastic scattering cross section were measured at Hermes. These modulations are sensitive to the polarization and transverse motion of quarks within the nucleon. The Cahn effect, which contributes at subleading twist (twist-3) to cosφh and twist-4 to cos2φh, is sensitive to transverse motion of quarks. The Boer-Mulders effect, which contributes at subleading twist to cosφh and leading twist to cos2φh, requires non-zero transverse quark motion and is sensitive to quark polarization, effectively measuring the quark spin-orbit correlation. These modulations were measured in a fully differential way, as a function of x, y, z, and Ph⊥ for positive and negative pions, kaons, and unidentified-hadrons produced from hydrogen and deuterium targets at Hermes. This is the the most complete measurement to date, for the first time granting access to the flavor dependent distribution and fragmentation functions that generate these moments. These measurement would not have been possible without an improved hadron-type identification algorithm for the Ring Imaging Cherenkov (RICH) detector. The EVT event-level algorithm is presented and now is the primary method used at Hermes","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-07-08T21:59:16Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 thesis_upload.zip: 15463274 bytes, checksum: 60ced59215e1b445a0d6a4c177f2c224 (MD5) Lamb_Rebecca.pdf: 7186079 bytes, checksum: 597d576c31d6d41de1ffff94dd950b13 (MD5)","Made available in DSpace on 2010-08-20T17:57:04Z (GMT). No. of bitstreams: 5 Lamb_Rebecca_v2.pdf: 7186052 bytes, checksum: 94748320339831e97043c6a0990b0dcb (MD5) Lamb_Rebecca.pdf: 7186079 bytes, checksum: 597d576c31d6d41de1ffff94dd950b13 (MD5) thesis_upload_2.zip: 15463014 bytes, checksum: 39fe738c63415191b660357a7ce6aa74 (MD5) 1_Lamb_Rebecca.pdf: 7186052 bytes, checksum: 94748320339831e97043c6a0990b0dcb (MD5) license.txt: 4060 bytes, checksum: 1031bf1fa33f00e32a74871a9aa88abe (MD5)"],"dc:identifier":["http://hdl.handle.net/2142/16759"],"dc:language":["en"],"dc:rights":["Copyright 2010 Rebecca M. Lamb"],"dc:subject":["Cahn effect","Boer-Mulders distribution function","azimuthal modulations","semi-inclusive deep inelastic scattering","intrinsic transverse momentum","spin"],"dc:title":["The Boer-Mulders and Cahn effects: azimuthal modulations in the spin-independent SIDIS cross section at Hermes"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:09Z"}