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1. Physik
2. Event: 12/17/2024
Thesis defense of Louis Lenard Gerken

5700 B0→D+D- signal candidates yields the CP observables S_D+D- = -0.552 ± 0.100 (stat) ± 0.010 (syst), C_D+D- = 0.128 ± 0.103 (stat) ± 0.010 (syst). In the second measurement, approximately 13000 Bs0→Ds+Ds- [...] selected, and the CP observables are determined to be ϕsDs+Ds- = -0.086 ± 0.106 (stat) ± 0.028 (syst) rad, |λDs+Ds-| = 1.145 ± 0.126 (stat) ± 0.031 (syst). These results represent the most precise measurements [...] channels to date and are consistent with Standard Model predictions. For the first time, CP symmetry in B0→D+D- decays is excluded by a single measurement with a significance of more than six standard deviations …
1. Physik
2. Event: 3/15/2024
Thesis defense of Gerwin Meier

all three decays for the CP violation parameters in S(ψKS0) = 0.717 +/- 0.013 (stat.) +/- 0.008 (syst.), C(ψKS0) = 0.008 +/- 0.012 (stat.) +/- 0.003 (syst.), where S corresponds to sin(2β). This is consistent [...] dependent measurement of CP violation in B→ψKS0 decays. In this thesis data from B→J/ψ(→μμ)KS0, B→ψ(2S)(→μμ)KS0 and B→J/ψ(→ee)KS0 decays is analysed with KS0→π+π- collected at a centre-of-mass energy of …
1. Physik
2. Event: 5/27/2021
Thesis defense of Patrick Mackowiak

BR(Λb→ψ(2S)Λ)/BR(Λb→J/ψΛ)= 0.513 ± 0.023 (stat) ± 0.016 (syst) ± 0.011 (BR). The second analysis is a on-going measurement of CP violation in g in B0→J/ψKS, B0→ψ(2S)KS and Bs0→J/ψKS decays. The analysed [...] measured sensitivities of the CP parameters S and C in the analysed Bd0 decays are σ(S) = 0.0133 (stat) ± 0.0063 (\syst), σ(C) = 0.0125 (stat) ± 0.0042 (syst). This single measurement will have a better sensitivity …
1. Physik
2. Event: 11/22/2023
Thesis defense of Marc Quentin Führing

n and selection of 378 700 +/- 700 Bs0 to Ds- pi+ decays, the most precise measurement of the Bs0-Bsbar0 oscillation frequency DeltaMs = (17.7683 +/- 0.0051 +/- 0.0032) ps−1 in the world to date is achieved [...] ingredient to increase the precision of decay-time-dependent measurements of other Bs0-decay modes. The presented analysis of Bs0 to Ds K decays benefits from this updated measurement of DeltaMs and from further [...] AV-Raum + ZOOM In this thesis, two decay-time-dependent analyses of Bs0-meson decays are presented. Precise measurements are performed using proton-proton collision data recorded by the LHCb experiment …
1. Physik
2. Event: 8/23/2022
Thesis defense of Alexander Battig

ZOOM In this thesis searches for the purely leptonic decays Bs0 → e+e- and B0 → e+e- as well as the lepton-flavour violating decays B+ → K+ e+ μ- are presented. As these decays are rare or forbidden in [...] place constraints on scenarios of physics beyond the Standard Model. The search for the decays Bs0 → e+e- and B0 → e+e- uses data collected by the LHCb experiment in the years 2011, 2012,2015 and 2016, it is [...] is the first search for these decays at the LHC. Upper limits on the brnaching fractions of Bs0 → e+e- and B0 → e+e- are set at the order of O (10-8), improving the previous limits by a factor of 30. The …
1. Arbeitsgruppe Albrecht
2. Research
LHCb CP violation

the most precise measurement of the Bs0-Bs0bar oscillation frequency Δms=(17.7683±0.0051±0.0032)ps-1 has been performed at the LHCb experiment using flavor-specific Bs0 -> Ds- pi+ decays . In addition to [...] their decay, which in the case of flavor-specific Bs0 -> Ds- pi+ decays can be deduced from the charge of the daughter particles, the mixing state of the Bs0 mesons can thus be determined. The amplitude of [...] group, it has been possible to measure the oscillation of neutral Bs0 mesons with unprecedented precision. Decay time distribution of Bs0 -> Ds- pi+ candidates divided by mixing state: unmixed (blue), mixed …
1. Arbeitsgruppe Albrecht
2. Event: 9/11/2024
Special colloquium: Measurement of the CKM angle γ at LHCb and commissioning of the SciFi tracker for Run 3

with D → KS0π+π-π0 is presented, using a generalized BPGGSZ method, where an additional π0 meson is introduced. Among the possible sub-decays, there is two-body CP-odd eigen-state D → KS0ω(π+π-π0), while [...] on γ thanks to the rich resonance structure of the D → KS0π+π-π0 decay but requires knowledge of the strong phase difference between the D0 and D0bar processes, which varies with the final-state kinematics [...] with the three-body decay D → KS0π+ππ- currently is the most precisely studied mode in LHCb. That is why we study the corresponding D four-body decay with an additional π0, which has been studied in Belle …
1. Physik
2. Event: 10/7/2024
Thesis defense of Vukan Jevtic

performed in the three analyzed channels and gives the result S = 0.717 +- 0.013 (stat) +- 0.008 (syst), C = 0.008 +- 0.012 (stat) +- 0.003 (syst). This result is more precise than the previous world averages …
1. Physik
2. Department
3. Dean's Office
Secretariat - Dean's Office - Department of Physics

an appointment in advance. Phone +49 (0)231 755-3503 E-mail dekanat.physik tu-dortmund de Campus address Otto-Hahn-Str. 4 Campus Nord Physik Raum: P2-E0-412 and P2-E0-413 Postal address TU Dortmund University [...] Room P2-E0-413 Fax: 0231 755-5027 Telefon: 0231 755-3503 Contact-Email: requests-international-students.physiktu-dortmund.de Secretariat Jochen Averesch Location: Otto-Hahn-Straße 4, Room P2-E0-413 Tel …
1. Arbeitsgruppe Albrecht
2. News: 3/29/2023
Annual and Spring Meeting of the German Physical Society 2023 in Dresden

DsK, and B0→ J/ψ KS Louis Gerken: CP violation measurement in B0 → D+ D− and Bs0 → Ds+ Ds− decays at the LHCb experiment Jan Langer: Observation of Bs0 → D*+D*− and CP violation studies in B0 → D*+D*− with [...] with the LHCb experiment Jonah Blank: Search for the B0→ D0D0bar decay with the LHCb experiment Jan Peter Herdieckerhoff: Multi-lepton B decays within the Standard Model and their impact on LHCb analysis …

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