Dissertation/ Thesis
The measurement of the production cross section ratio of identified hadrons and the calibration of the magnetic distortion in RICH1 at LHCb
| Τίτλος: | The measurement of the production cross section ratio of identified hadrons and the calibration of the magnetic distortion in RICH1 at LHCb |
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| Συγγραφείς: | Contu, Andrea |
| Συνεισφορές: | Harnew, Neville |
| Στοιχεία εκδότη: | University of Oxford, 2012. |
| Έτος έκδοσης: | 2012 |
| Θεματικοί όροι: | 539.7, Physical Sciences, Particle physics, Physics, LHCb, Hadron Ratio, Baryon Number Transport, Hadronisation |
| Περιγραφή: | Physics measurements at the LHC rely on the imulation of the proton-proton interaction to estimate detector performance and physics ackgrounds. Therefore, a good understanding of ll the processes involved is crucial to the final precision of any measurement. Monte Carlo event generators try to provide a realistic description of the proton-proton collision by combining the theoretical models describing different stages of the interaction process. Within this framework, the baryon number transport and the hadronisation mechanism are currently described by phenomenological models that need input from experimental data. This thesis investigates these subjects in the unique kinematic region covered by the LHCb detector. The production cross section ratios of identified hadrons (protons, kaons and pions) have been measured as a function of pseudorapidity and transverse momentum both at $sqrt{s} = 0.9$ TeV and $sqrt{s} = 7$ TeV collisions using 320 $mub^{-1}$ and 1.8 $nb^{-1}$ of data respectively. The measurements are then compared to the predictions from several tunings of the PYTHIA Monte Carlo generator. In general, current models do not give a satisfactory description of the hadronisation and tend to underestimate the transport of the baryon number into the final state. Critical to this analysis is the particle identification provided by the LHCb Ring Imaging Cherenkov (RICH) system. To ensure high performance, a proper calibration of the RICH photon detectors response is necessary. A system for the calibration of the magnetic distortion induced by the LHCb dipole magnet onto the photon detectors is described. The system currently provides calibration parameters used in the LHCb event reconstruction software and introduces a critical improvement to the overall particle identification performance. |
| Τύπος εγγράφου: | Thesis Or Dissertation |
| Γλώσσα: | English |
| Σύνδεσμος πρόσβασης: | https://ethos.blethoshyku.com/concern/thesis_or_dissertations/581027 |
| Αριθμός Καταχώρησης: | edsble.581027 |
| Βάση Δεδομένων: | British Library EThOS |
| FullText | Text: Availability: 0 CustomLinks: – Url: https://ethos.blethoshyku.com/concern/thesis_or_dissertations/581027 Name: EDS - British Library EThOS (ns324271) Category: fullText Text: View record in EThOS |
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| Header | DbId: edsble DbLabel: British Library EThOS An: edsble.581027 RelevancyScore: 924 AccessLevel: 3 PubType: Dissertation/ Thesis PubTypeId: dissertation PreciseRelevancyScore: 923.984313964844 |
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| Items | – Name: Title Label: Title Group: Ti Data: The measurement of the production cross section ratio of identified hadrons and the calibration of the magnetic distortion in RICH1 at LHCb – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Contu%2C+Andrea%22">Contu, Andrea</searchLink> – Name: Author Label: Contributors Group: Au Data: Harnew, Neville – Name: Publisher Label: Publisher Information Group: PubInfo Data: University of Oxford, 2012. – Name: DatePubCY Label: Publication Year Group: Date Data: 2012 – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22539%2E7%22">539.7</searchLink><br /><searchLink fieldCode="DE" term="%22Physical+Sciences%22">Physical Sciences</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+physics%22">Particle physics</searchLink><br /><searchLink fieldCode="DE" term="%22Physics%22">Physics</searchLink><br /><searchLink fieldCode="DE" term="%22LHCb%22">LHCb</searchLink><br /><searchLink fieldCode="DE" term="%22Hadron+Ratio%22">Hadron Ratio</searchLink><br /><searchLink fieldCode="DE" term="%22Baryon+Number+Transport%22">Baryon Number Transport</searchLink><br /><searchLink fieldCode="DE" term="%22Hadronisation%22">Hadronisation</searchLink> – Name: Abstract Label: Description Group: Ab Data: Physics measurements at the LHC rely on the imulation of the proton-proton interaction to estimate detector performance and physics ackgrounds. Therefore, a good understanding of ll the processes involved is crucial to the final precision of any measurement. Monte Carlo event generators try to provide a realistic description of the proton-proton collision by combining the theoretical models describing different stages of the interaction process. Within this framework, the baryon number transport and the hadronisation mechanism are currently described by phenomenological models that need input from experimental data. This thesis investigates these subjects in the unique kinematic region covered by the LHCb detector. The production cross section ratios of identified hadrons (protons, kaons and pions) have been measured as a function of pseudorapidity and transverse momentum both at $sqrt{s} = 0.9$ TeV and $sqrt{s} = 7$ TeV collisions using 320 $mub^{-1}$ and 1.8 $nb^{-1}$ of data respectively. The measurements are then compared to the predictions from several tunings of the PYTHIA Monte Carlo generator. In general, current models do not give a satisfactory description of the hadronisation and tend to underestimate the transport of the baryon number into the final state. Critical to this analysis is the particle identification provided by the LHCb Ring Imaging Cherenkov (RICH) system. To ensure high performance, a proper calibration of the RICH photon detectors response is necessary. A system for the calibration of the magnetic distortion induced by the LHCb dipole magnet onto the photon detectors is described. The system currently provides calibration parameters used in the LHCb event reconstruction software and introduces a critical improvement to the overall particle identification performance. – Name: TypeDocument Label: Document Type Group: TypDoc Data: Thesis Or Dissertation – Name: Language Label: Language Group: Lang Data: English – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="https://ethos.blethoshyku.com/concern/thesis_or_dissertations/581027" linkWindow="_blank">https://ethos.blethoshyku.com/concern/thesis_or_dissertations/581027</link> – Name: AN Label: Accession Number Group: ID Data: edsble.581027 |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=edsble&AN=edsble.581027 |
| RecordInfo | BibRecord: BibEntity: Languages: – Text: English Subjects: – SubjectFull: 539.7 Type: general – SubjectFull: Physical Sciences Type: general – SubjectFull: Particle physics Type: general – SubjectFull: Physics Type: general – SubjectFull: LHCb Type: general – SubjectFull: Hadron Ratio Type: general – SubjectFull: Baryon Number Transport Type: general – SubjectFull: Hadronisation Type: general Titles: – TitleFull: The measurement of the production cross section ratio of identified hadrons and the calibration of the magnetic distortion in RICH1 at LHCb Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Contu, Andrea – PersonEntity: Name: NameFull: Harnew, Neville IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Type: published Y: 2012 Identifiers: – Type: issn-locals Value: edsble |
| ResultId | 1 |