Difference between revisions of "Master student Projects"
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=== Projects for Master students in the Nikhef B-physics (LHCb) group 2017 - 2018=== | === Projects for Master students in the Nikhef B-physics (LHCb) group 2017 - 2018=== | ||
| − | date: | + | date: April 2018 |
This is an overview with all available Master student projects in the Nikhef B-physics (LHCb) group. | This is an overview with all available Master student projects in the Nikhef B-physics (LHCb) group. | ||
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{| border="1" cellpadding="2" cellspacing="0" | {| border="1" cellpadding="2" cellspacing="0" | ||
|- | |- | ||
| − | ! style="background:#3399ff;" | <font color=#ffffff> 2) Measurement of BR( | + | ! style="background:#3399ff;" | <font color=#ffffff> 2) Measurement of BR(B0 ->Ds+ Ds-) </font> |
|} | |} | ||
| − | ''' Supervisors:''' | + | ''' Supervisors:''' Sevda Esen (postdoc), Niels Tuning (staf), Michele Veronesi (PhD) |
''' Research description: ''' | ''' Research description: ''' | ||
| − | This project aims to discover the branching fraction of the decay | + | This project aims to discover the branching fraction of the decay B0->Ds- Ds+. |
| − | The decay | + | The decay B0->Ds- Ds+ is quite rare, because it occurs through the exchange of a W-boson between the |
| − | + | b and the d-quark of the B0-meson. | |
| + | This decay proceeds via Cabibbo-suppressed W-exchange and | ||
| + | has not yet been observed; theoretical calculations predict | ||
| + | a branching fraction at the order of 10^-5 with a best | ||
| + | experimental upper limit of 3.6x10^-5. | ||
| − | + | A measurement of the decay rate of B0 -> Ds+Ds- relative to | |
| − | + | that of B0 -> D+D- can provide an estimate of the W-exchange contribution | |
| − | + | to the latter decay, a crucial piece of information for extracting | |
| + | the CKM angle gamma from B0 ->D(*)D(*). | ||
| − | + | The aim is to determine the relative branching fraction of B0->Ds+Ds- with respect to B0->Ds+D- decays | |
| − | + | (which has the best known branching ratio at present, (7.2 +- 0.8)x10^-3), | |
| − | The aim is to determine the relative branching fraction of | + | in close collaboration with the PhD. |
| − | in close collaboration with the PhD | ||
The aim is that this project results in a journal publication on behalf of the LHCb collaboration. | The aim is that this project results in a journal publication on behalf of the LHCb collaboration. | ||
For this project computer skills are needed. | For this project computer skills are needed. | ||
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''' Relevant information: ''' | ''' Relevant information: ''' | ||
| − | [1] | + | [1] M.Jung and S.Schacht, |
| − | + | "Standard Model Predictions and New Physics Sensitivity in B ? DD Decays" | |
| − | + | https://arxiv.org/pdf/1410.8396.pdf | |
| − | [2] R. | + | [2] L.Bel, K.de Bruyn, R. Fleischer, M.Mulder, N.Tuning, |
| − | + | "Anatomy of B ? DD Decays" | |
| − | + | https://arxiv.org/pdf/1505.01361.pdf | |
| − | [3] | + | [3] A.Zupanc et al [Belle Collaboration] |
| − | + | "Improved measurement of B0 ? Ds?D+ and search for B0 ? Ds+Ds? at Belle" | |
| − | + | https://arxiv.org/pdf/hep-ex/0703040.pdf | |
| − | [4] | + | [4] B.Aubert et al. [Babar Collaboration] |
| − | + | "Search for the W-exchange decays B0 ? D(?)?D(?)+" | |
| − | + | https://arxiv.org/pdf/hep-ex/0510051.pdf | |
| + | |||
| + | [5] R.Aaij et al. [LHCb Collaboration], | ||
| + | "First observations of B0s ? D+D?, Ds+D? and D0D0 decays" | ||
| + | https://arxiv.org/pdf/1302.5854.pdf | ||