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https://github.com/avitase/phdthesis

Dissertation for the degree of doctor rerum naturalium (Dr. rer. nat) to the Faculty of Mathematics and Natural Sciences of the University of Rostock, Germany.

https://github.com/avitase/phdthesis

Science Score: 13.0%

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dissertation phd-thesis physics
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Dissertation for the degree of doctor rerum naturalium (Dr. rer. nat) to the Faculty of Mathematics and Natural Sciences of the University of Rostock, Germany.

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dissertation phd-thesis physics
Created over 5 years ago · Last pushed about 5 years ago

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# Search for Rare b to Open-Charm Two-Body Decays of Baryons at LHCb

Dissertation for the degree of doctor rerum naturalium (Dr. rer. nat) to the [Faculty of Mathematics and Natural Sciences](https://www.mathnat.uni-rostock.de/) of the University of Rostock, Germany.

 - [Thesis (pdf)](thesis.pdf)
 - [Slides of scientific colloquium (pdf)](defence/phddefence_nismeinert.pdf)
 - Opening of the doctoral degree procedure: Jun 2020
 - Date of scientific colloquium: Nov 2020
 - Cite as: [doi.org/10.18453/rosdok_id00002802](https://doi.org/10.18453/rosdok_id00002802) or [CERN-THESIS-2020-217](https://cds.cern.ch/record/2746434)

  ## Abstract
  A search for the rare two-body decays b  D and b  D is performed with proton-proton collision data, corresponding to an integrated luminosity of 1/(6 fb), collected by the LHCb experiment at a center-of-mass energy of 13 TeV. The decay b  D is seen with a statistical significance of 5.5 standard deviations, and constitutes the discovery for this decay.

  The branching fraction, measured using the b  Dp decay for normalization, is 
  (b  D) = (9.9  2.3  1.6  1.1) x 1e-6, where the uncertainties are statistical, systematic, and external, respectively.
  An excess of b  D candidates w.r.t. the background is observed with a statistical significance of 1.8 standard deviations and is used to estimate the upper limit f(b) / f(b) x B(b  D) / f(b  D) < 0.5 (CL = 95%), where f(b) / f(b) is the ratio of the fragmentation fractions of b-quarks into b and b baryons.

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  • Name: Nis Meinert
  • Login: avitase
  • Kind: user
  • Company: Pasteur Labs

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