@@ Line 1: / Line 1: @@
-=== Projects for Master students in the Nikhef B-physics (LHCb) group ===
+=== Projects for Master students in the Nikhef B-physics (LHCb) group 2020 - 2021 ===
-date: March 2017
+date: April 2020
 This is an overview with all available Master student projects in the Nikhef B-physics (LHCb) group.
@@ Line 11: / Line 11: @@
 either the contact person for the project and/or the Nikhef B-physics group leader:
-Marcel Merk [e-mail: i93_at_nikhef.nl, Tel 020-5925107, Nikhef room N2xx]
+Marcel Merk [e-mail: i93_at_nikhef.nl, Tel 020-5925107, Nikhef room N243]
 For an overview of the theses written in the Nikhef B-physics group you can look at the
 [https://wiki.nikhef.nl/lhcb/Thesis_page_LHCb_Nikhef Nikhef LHCb theses page]
+(The full list of projects at Nikhef can be found [https://wiki.nikhef.nl/education/Master_Projects here].)
 === Master projects in the Nikhef B-physics group ===
+<!-- ######################################################################
+TEMPLATE
+{| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 1) Title </font>
+|}
+'''Supervisor''' : S.Taff (staff)
+'''Research Description:'''
+Abstract
+''' Relevant information: '''
+[1]  [https://arxiv.org/abs/1507.03414 arXiv:1507.03414] (thesis or paper)
+END TEMPLATE
+##########################################################################  -->
 {| border="1" cellpadding="2" cellspacing="0"
 |-
-! style="background:#3399ff;" | <font color=#ffffff> 1) Searches for new pentaquarks </font>
+! style="background:#3399ff;" | <font color=#ffffff> 1) Measurement of delta md </font>
 |}
-'''Supervisor''' : P. Koppenburg (staff)
+'''Supervisor''' : Niels Tuning (staff), Emmy Gabriel (postdoc), Michele Veronesi (PhD)
 '''Research Description:'''
-In 2015 LHCb surprisingly discovered states containing five quarks, called Pc+ pentaquarks. Such particles question our understanding of confinement, the principle that forces quarks to remain in a single hadron. Which hadrons are allowed and which are not? The pentaquarks were found in the decay of the Lambda_b baryon to a Pc+ and a kaon, and Pc+ to a J/psi and a proton. This project aims at studying other similar but yet unobserved decays which could reveal the presence of the know Pc+, or yet unknown pentaquarks. The student will optimise a selection for finding such a decay in LHCb data using machine learning techniques.
+The decay B0->D-pi+ is very abundant in LHCb, and therefore ideal to study the oscillation frequency
+delta md, with which B0 mesons oscillate into anti-B0 mesons, and vice versa.
+This process proceeds through a so-called box diagram which might hide new yet-undiscovered particles.
+Recently, it has been realized that value of delta md is in tension with the valu of CKM-angle gamma,
+triggering renewed interest in this measurement.
+Our group at Nikhef has 10 years experience in the analysis of B->Dh decays.
+This analysis may lead to a publication on behalf of the LHCb collaboration.
 ''' Relevant information: '''
-[1]  [https://arxiv.org/abs/1507.03414 arXiv:1507.03414] (the pentaquark paper)
-[2] [https://arxiv.org/abs/1406.0755 arXiv:1406.0755] (a paper by P. Koppenburg similar to what the project could lead to).
+[1] [https://arxiv.org/abs/1812.06963 arXiv:1812.06963] M. Blanke, A. Buras, Emerging delta md Anomaly from Tree-Level Determinations of |Vcb| and the angle gamma
+[2] [https://arxiv.org/abs/1911.07856 arXiv:1911.07856] D. King, A. Lenz, Th. Rauh, |Vcb| and gamma from mixing
+[3] [https://indico.nikhef.nl/event/1379/contribution/1/material/slides/0.pdf talk] N. Tuning, CKM unitarity and B mixing
+[4]  [https://arxiv.org/abs/1210.6750 arXiv:1210.6750] LHCb coll.,
+[5] [https://arxiv.org/abs/1805.03448 arXiv:1805.03448] LHCb coll.,
+{| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 2) Searching for CPT violation </font>
+|}
+'''Supervisor''' : Niels Tuning (staff), Emmy Gabriel (postdoc), Michele Veronesi (PhD)
+'''Research Description:'''
+CPT symmetry is closely linked to Lorentz symmetry, and any violation
+would revolutionize science. There are possibilities though that supergravity could
+cause CPT violating effects in the system of neutral mesons.
+The precise study of B0s oscillations in the abundant Bs->Dspi decays can
+give the most stringent limits on Im(z) to date.
+Our group at Nikhef has 10 years experience in the analysis of B->Dh decays.
+This analysis may lead to a publication on behalf of the LHCb collaboration.
+''' Relevant information: '''
+[1]  [https://arxiv.org/abs/1603.04804 arXiv:1603.04804] LHCb coll.,
+Search for violations of Lorentz invariance and CPT symmetry in B0(s) mixing
+[2] [https://arxiv.org/abs/1407.1269 arXiv:1407.1269] J. van Tilburg and M. van Veghel,
+Status and prospects for CPT and Lorentz invariance violation searches in neutral meson mixing
 {| border="1" cellpadding="2" cellspacing="0"
 |-
-! style="background:#3399ff;" | <font color=#ffffff> 2) Measurement of BR(Lb->p Ds-) </font>
+! style="background:#3399ff;" | <font color=#ffffff> 3) BR(B0->D-pi+) and fd/fu with B+->D0pi+ </font>
 |}
-''' Supervisors:''' Niels Tuning (staff), Lennaert Bel (PhD) , Mick Mulder (PhD)
+'''Supervisor''' : Niels Tuning (staff), Emmy Gabriel (postdoc), Michele Veronesi (PhD)
-''' Research description: '''
+'''Research Description:'''
-This project aims to discover the branching fraction of the decay Lb->p Ds+.
+The abundant decay B0->D-pi+ is often used as normalization channel, given its
-The decay Lb->p Ds+ is quite rare, because it occurs through the transition of a b-quark
+clean signal, and well-known branching fraction, as measured by the B-factories.
-to a u-quark. It has not been measured yet (although some LHCXb colleagues claim to have seen it in the past).
+However, this branching fraction can be determined more precisely, when comparing
+to the decay B+->D0pi+ , which has a twice better precision.
-This decay is interesting, because <br>
+In addition, the production of B0 and B+ mesons is often assumed to be equal,
-) It is sensitive to the CKM-element Vub, which determination is heavily debated.<br>
+based on isospin symmetry. The study of B+->D0pi+ and B0->D-pi+ allows for the
-) It can quantify non-factorisable QCD effects in b-baryon decays.
+first measurement of this ratio, fd/fu.
-The decay is closely related to B0->pi-Ds+, which proceeds through a similar
+Our group at Nikhef has 10 years experience in the analysis of B->Dh decays.
-Feynman diagram. Also the final state of B0->pi-Ds+ is almost identical to Lb->p Ds+.
+This analysis may lead to a publication on behalf of the LHCb collaboration.
-The aim is to determine the relative branching fraction of  Lb->pDs+ with respect to B0->D+pi- decays,
-in close collaboration with the PhD (who will study BR(B0->pi-Ds+)/BR(B0->D+pi-) ).
-The aim is that this project results in a journal publication on behalf of the LHCb collaboration.
-For this project computer skills are needed.
-The ROOT programme and C++ and/or Python macros are used.
-This is a project that is closely related to previous analyses in the group.
-Weekly video meetings with CERN coordinate the efforts with in the LHCb collaboration.
 ''' Relevant information: '''
-[1] R.Aaij et al. [LHCb Collaboration],
+[1]  [https://cds.cern.ch/record/2636716/files/CERN-THESIS-2018-137.pdf CERN-THESIS-2018-137] J. Butter,
-``Study of the kinematic dependences of Lambda_b production in pp collisions and a measurement of the Lambda_b->Lambda_c pi branching fraction'',
+Branching fraction measurement of B0->D+s pi?
-JHEP 08 (2014) 143 [arXiv:1405.6842 [hep-ex]].
+{| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 5) Searches for new pentaquarks </font>
+|}
+'''Supervisor''' : P. Koppenburg (staff)
-[2] R.Aaij et al. [LHCb Collaboration],
+'''Research Description:'''
-``Determination of the branching fractions of B0s->DsK and B0->DsK'',
-JHEP 05 (2015) 019 [arXiv:1412.7654 [hep-ex]].
+In 2015 LHCb surprisingly discovered states containing five quarks, called Pc+ pentaquarks. Such particles question our understanding of confinement, the principle that forces quarks to remain in a single hadron. Which hadrons are allowed and which are not? The pentaquarks were found in the decay of the Lambda_b baryon to a Pc+ and a kaon, and Pc+ to a J/psi and a proton. This project aims at studying other similar but yet unobserved decays which could reveal the presence of the know Pc+, or yet unknown pentaquarks. The student will optimise a selection for finding such a decay in LHCb data using machine learning techniques.
-[3] R. Fleischer, N. Serra and N. Tuning,
+''' Relevant information: '''
-``Tests of Factorization and SU(3) Relations in B Decays into Heavy-Light Final States'',
-Phys. Rev. D 83, 014017 (2011) [arXiv:1012.2784 [hep-ph]].
-[4] K. de Bruyn, R. Fleischer, R. Knegjens, M. Merk, M. Schiller and N. Tuning,
+[1]  [https://arxiv.org/abs/1507.03414 arXiv:1507.03414] (the pentaquark paper)
-``Exploring Bs -> Ds(*)K Decays in the Presence of a Sizable Width Difference Delta Gamma_s'',
-Nucl. Phys. B 868, 351 (2013) [arXiv:1208.6463 [hep-ph]].
+[2] [https://arxiv.org/abs/1406.0755 arXiv:1406.0755] (a paper by P. Koppenburg similar to what the project could lead to).
 {| border="1" cellpadding="2" cellspacing="0"
 |-
-! style="background:#3399ff;" | <font color=#ffffff> 3) Measurement of BR(B0->pi Ds-) </font>
+! style="background:#3399ff;" | <font color=#ffffff> 6) Measurement of the relative efficiency of muons and electrons with J/psi->ll decays </font>
 |}
-''' Supervisors:''' Niels Tuning (staff), Lennaert Bel (PhD) , Mick Mulder (PhD)
+''' Supervisors:''' Patrick Koppenburg
 ''' Research description: '''
-This project aims to measure the branching fraction of the decay B0->pi Ds+.
+LHCb has produced intriguing results hinting at violation of lepton universality. As extraordinary claims require extraordinary evidence we propose to perform a measurement of the relative reconstruction efficiency of electrons and muons by comparing the number of J/psi particles counted in the di-electron and di-muon final states.
-This decay is closely related to Lb->p Ds+ (see above), and close collaboration between the two master projects is foreseen.
+{| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 7) Very rare decays of B mesons</font>
+|}
+''' Supervisors:''' Marcel Merk
+''' Research description: '''
+Decays of B-mesons to a pair of muons or a pair of electrons are very strongly suppressed in the Standard Model. As a consequence these decays are sensitive to virtual contributions of particles beyond the Standard Model. The project includes a theoretical study on these sensitivties and/or experimental improvements to the measurement.
-''' Relevant information: '''
-[1] [http://www.nikhef.nl/pub/experiments/bfys/lhcb/Theses/master/2015_MickMulder.pdf Master Thesis], Mick Mulder, 2015.
 {| border="1" cellpadding="2" cellspacing="0"
 |-
-! style="background:#3399ff;" | <font color=#ffffff> 4) A search for heavy neutrinos in the decay of W at LHCb  </font>
+! style="background:#3399ff;" | <font color=#ffffff> 8) Measurement of Central Exclusive Production Rates of Chi_c using converted photons in LHCb. </font>
 |}
-''' Supervisors:''' Wouter Hulsbergen (staff), Elena Dall'Occo (PhD)
+''' Supervisor:''' Kazu Akiba
 ''' Research description: '''
+Central exclusive production (CEP) of particles at the LHC is characterised by a extremely clean signature.  Differently from the typical inelastic collisions where many particles are created resulting in a so-called Primary Vertex, CEP events have only the final state particles of interest. In this project the particle of interest is a pair of charmed quarks creating a chi_c particle. In theory this process is generated by a long range gluon exchange and can elucidate the nature of the strong force, described by the quantum chromodynamics in the the standard model. The proposed work involves  analysing a pre-existing dataset with reconstructed chi_c and simulating events at the LHCb in order to obtain the relative occurrence rate of each chi_c species (spins 0, 1, 2), a quantity that can be easily compared to theoretical predictions.
+{| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 9) Optimization studies for Vertex detector at the High Lumi LHCb </font>
+|}
+''' Supervisor:''' Kazu Akiba
-Neutrinos are arguably the most mysterious of all known fundamental fermions as they are both much lighter than all others and only weakly interacting.
+''' Research description: '''
-It is thought that the tiny mass of neutrinos can be explained by their mixing with so-far unknown, much heavier, neutrino-like particles.
+The LHCb experiment is dedicated to measure tiny differences between matter and antimatter through the precise study of rare processes involving b or c quarks.  The LHCb detector will undergo a major modification in order to dramatically increase the luminosity and be able to  measure indirect effects of physics beyond the standard model.  In this environment, over 42 simultaneous collisions are expected to happen at a time interval of 200 ps where the two proton bunches overlap. The particles of interest have a relatively long lifetime and therefore the best way to distinguish them from the background collisions is through the precise reconstruction of displaced vertices and pointing directions.  The new detector considers using extremely recent or even future technologies to measure space (with resolutions below 10 um) and time (100 ps or better) to efficiently reconstruct the events of interest for physics.  The project involves changing completely  the LHCb Vertex Locator (VELO) design in simulation and determine what can be the best performance for the upgraded detector, considering different spatial and temporal resolutions.
-In this research proposal we look for these new neutrinos in the decay of the SM W-boson using data with the LHCb experiment at CERN.
-The W boson is assumed to decay to a heavy neutrino and a muon. The heavy neutrino subsequently decays to a muon and a pair of quarks.
-Both like-sign and opposite-sign muon pairs will be studied. The result of the analysis will either be a limit on the production of the new neutrinos
-or the discovery of something entirely new.
 {| border="1" cellpadding="2" cellspacing="0"
 |-
-! style="background:#3399ff;" | <font color=#ffffff> 5) A Scintillator Fibers Tracker </font>
+! style="background:#3399ff;" | <font color=#ffffff> 10) Measurement of charge multiplication in heavily irradiated sensors </font>
 |}
-''' Supervisors:''' Antonio Pellegrino
+''' Supervisor:''' Kazu Akiba
 ''' Research description: '''
+During the R&D phase for the LHCb VELO Upgrade detector a few sensor prototypes were irradiated to the extreme fluence expected to be achieved during the detector lifetime. These samples were tested using high energy particles at the SPS facility at CERN with their trajectories reconstructed by the Timepix3 telescope. A preliminary analysis revealed that at the highest irradiation levels the amount of signal observed is higher than expected, and even larger than the signal obtained at lower doses.   At the Device Under Test (DUT) position inside the telescope, the spatial resolution attained by this system is below 2 um. This means that a detailed analysis can be performed in order to study where and how this signal amplification happens within  the 55x55 um^2 pixel cell.  This project involves analysing the telescope and DUT data to investigate the charge multiplication mechanism at the microscopic level.
+{| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 11) Searching for lepton-universality violation with ?b ? ?l+l? decays </font>
+|}
+'''Supervisor''' : Niels Tuning (staff), Lex Greeven (PhD), Mick Mulder (postdoc@CERN)
+'''Research Description:'''
+into muons and into electrons/taus. Recent measurements in meson modes show hints (2 ? 3?) of lepton non-universality. Baryonic modes, however, have been less studied and provide an independent test of lepton-universality. At Nikhef, we study the decay ?b ? ?l+l- , where l can be an electron or a muon. There are two possible project topics:
+. Identifying novel analysis techniques in the high di-lepton invariant mass region. Electrons in this region undergo more Bremsstrahlung, and therefore have a worse momentum resolution,
+meaning background from the resonant ? (2s) mode can leak into our signal. Since we expect most of our signal in this region, it is important to improve this, most likely using machine learning techniques.
+. Identifying, simulating, and setting up a rejection for partially reconstructed ?0b ? ?*l+l? backgrounds. By not fully reconstructing the excited ?0, we can mis-reconstruct it as a signal
+candidate. Machine learning techniques could be explored.
+''' Relevant information: '''
+[1]  [https://arxiv.org/abs/1903.09252 arXiv:1903.09252] LHCb coll., Search for lepton-universality violation in B+?K+l+l?decays
+[2]  [https://arxiv.org/abs/1705.05802 arXiv:1903.09252] LHCb coll., Test of lepton universality with B0?K*0l+l? decays
+[3]  [https://arxiv.org/abs/1912.08139 arXiv:1912.08139] LHCb coll., Test of lepton universality with ?b?pKl+l? decays
+[4]  [https://arxiv.org/abs/1602.01399 arXiv:1602.01399] W. Detmold and S. Meinel, ?b??l+l? form factors, differential branching fraction, and angular observables from lattice QCD with relativistic b-quarks
+<!-- ################################################# -->
+<!-- ################################################# -->
+<!-- ################################################# -->
+<!-- ################################################# -->
+<!--
+=============
+OLD PROJECTS
+==============
+-->
+<!-- ################################################# -->
+<!--
+| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 5) A Scintillator Fibers Tracker </font>
+|}
+''' Supervisors:''' Antonio Pellegrino
+''' Research description: '''
 The LHCb collaboration is upgrading the present tracking system
 constructing a new tracker based on scintillating fibers combined
@@ Line 140: / Line 265: @@
 in a large team of physicists and engineers. Possible collaborations
 with the Nikhef R&D group can also be envisaged.
+-->
+<!-- ################################################# -->
+<!-- ################################################# -->
+<!--
+{| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 7) Construction of the velo upgrade detector</font>
+|}
+''' Supervisors:''' Wouter Hulsbergen
+''' Research description: '''
+{| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 8) *Probing the dark sector with Y(1S)->4mu events* </font>
+|}
+''' Supervisors:''' Wouter Hulsbergen
+''' Research description: '''
+In certain parts of their parameter space Hidden Valley theories predict upsilon decays to two new dark sector particles that subsequently decay into two muons. These particles may or may not be long-lived. In this project we search for such events in LHCb run-2 data using the Turbo stream.
+{| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 6) The Z forward backward asymmetry </font>
+|}
+''' Supervisors:''' Wouter Hulsbergen
+''' Research description: '''
+The forward backward asymmetry of Z->mumu decays probes the standard model weak mixing angle, providing a strong test of the standard model. A dominating systematic uncertainty in this measurement is the affect of detector misalignments. In this project Z->mumu events are used to improve the detector alignment and thereby increase the precision of the run-2 measurements.
+-->
+<!-- ################################################# -->
+<!-- ################################################# -->
+<!--
+{| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 4) A search for heavy neutrinos in the decay of W at LHCb  </font>
+|}
+''' Supervisors:''' Wouter Hulsbergen (staff), Elena Dall'Occo (PhD)
+''' Research description: '''
+Neutrinos are arguably the most mysterious of all known fundamental fermions as they are both much lighter than all others and only weakly interacting.
+It is thought that the tiny mass of neutrinos can be explained by their mixing with so-far unknown, much heavier, neutrino-like particles.
+In this research proposal we look for these new neutrinos in the decay of the SM W-boson using data with the LHCb experiment at CERN.
+The W boson is assumed to decay to a heavy neutrino and a muon. The heavy neutrino subsequently decays to a muon and a pair of quarks.
+Both like-sign and opposite-sign muon pairs will be studied. The result of the analysis will either be a limit on the production of the new neutrinos
+or the discovery of something entirely new.
+-->
+<!-- ################################################# -->
+<!-- ################################################# -->
+<!-- Commented out by Niels Apr 2020.
+{| border="1" cellpadding="2" cellspacing="0"
+|-
+! style="background:#3399ff;" | <font color=#ffffff> 2) Measurement of BR(B0 -> Ds+ Ds-) </font>
+|}
+''' Supervisors:''' Sevda Esen (postdoc), Niels Tuning (staf), Michele Veronesi (PhD)
+''' Research description: '''
+This project aims to discover the branching fraction of the decay B0->Ds- Ds+.
+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),
+in close collaboration with the PhD.
+The aim is that this project results in a journal publication on behalf of the LHCb collaboration.
+For this project computer skills are needed.
+The ROOT programme and C++ and/or Python macros are used.
+This is a project that is closely related to previous analyses in the group.
+Weekly video meetings with CERN coordinate the efforts with in the LHCb collaboration.
+''' Relevant information: '''
+[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] L.Bel, K.de Bruyn, R. Fleischer, M.Mulder, N.Tuning,
+"Anatomy of B -> DD Decays"
+https://arxiv.org/pdf/1505.01361.pdf
+[3] A.Zupanc et al [Belle Collaboration]
+"Improved measurement of B0 -> DsD+ and search for B0 -> Ds+Ds at Belle"
+https://arxiv.org/pdf/hep-ex/0703040.pdf
+[4] B.Aubert et al. [Babar Collaboration]
+"Search for the W-exchange decays B0 -> DD+"
+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
-<!--
+{| border="1" cellpadding="2" cellspacing="0"
-=============
+|-
-OLD PROJECTS
+! style="background:#3399ff;" | <font color=#ffffff> 3) Measurement of relative ratio of B+ -> D0D+ and B+ -> D0Ds decays </font>
-==============
+|}
+''' Supervisors:''' Sevda Esen (postdoc), Niels Tuning (staf), Michele Veronesi (PhD)
+''' Research description: '''
+This decay is closely related to B0->Ds- Ds+ (see above), and close collaboration between the two master projects is foreseen.
+The decay mode B+->D0D+ is expected to be dominated by tree diagrams with some additional
+contributions from penguin diagrams. Assuming SU(3) symmetry,
+measurement of its branching fraction relative to Cabibbo-favored
+B+->D0D will enable better understanding of penguin contributions
+to the CP violating mixing phase.
+''' Relevant information: '''
+[1] L.Bel, K.de Bruyn, R. Fleischer, M.Mulder, N.Tuning,
+"Anatomy of B -> DD Decays"
+https://arxiv.org/pdf/1505.01361.pdf
+[2] R.Aaij et al. [LHCb Collaboration],
+"First observations of B0s -> D+D, Ds+D and D0D0 decays"
+https://arxiv.org/pdf/1302.5854.pdf
+[3] PDG: http://pdglive.lbl.gov/BranchingRatio.action?desig=261&parCode=S041
+-->
+<!-- ################################################# -->
- Commented out Nov 2014 by Niels (Elise is on this project)
+<!-- ################################################# -->
+<!-- Commented out Nov 2014 by Niels (Elise is on this project)
 {| border="1" cellpadding="2" cellspacing="0"
@@ Line 160: / Line 406: @@
 ''' Supervisors:''' Wouter Hulsbergen (staf) and Veerle Heijne (PhD)
 ''' Research description: '''
@@ Line 172: / Line 417: @@
 The ROOT programme and C++ and/or Python macros are used. You become part of our research group
 (~5 persons); we have weekly video meetings with colleagues at CERN.
 ''' Relevant information: '''
 Master thesis Suzanne Klaver (2013):
 [http://www.nikhef.nl/pub/experiments/bfys/lhcb/Theses/master/2013_SuzanneKlaver.pdf A Search for Long-lived Neutralinos in LHCb]
 End comment Niels Nov 2014 -->
+<!-- ################################################# -->
+<!-- ################################################# -->
 <!-- Commented out July 2014 Niels
@@ Line 186: / Line 431: @@
 ) World's best measurement of the Bc+ mass with Bc+ -> Bs pi+
 </font>|}
+''' Supervisors:''' Niels Tuning (staf), Jacco de Vries (PhD)
-''' Supervisors:''' Niels Tuning (staf), Jacco de Vries (PhD)
 ''' Research description: '''
@@ Line 210: / Line 453: @@
 ''' Relevant information: '''
-Master thesis Jacco de Vries (2013):
+[1] Master thesis Jacco de Vries (2013):
 [http://www.nikhef.nl/pub/experiments/bfys/lhcb/Theses/maste/2013_JaccoDeVries.pdf First observation of the decay Bc+ -> B0s pi+]
-LHCb collaboration, arXiv:1308.4544 (2013): [http://arxiv.org/abs/1308.4544 Observation of the decay Bc+ -> Bs pi+]
+[2] LHCb collaboration, arXiv:1308.4544 (2013): [http://arxiv.org/abs/1308.4544 Observation of the decay Bc+ -> Bs pi+]
-R. Fleischer, N. Serra and N. Tuning, Phys. Rev. D 83, 014017 (2011)
+[3] R. Fleischer, N. Serra and N. Tuning, Phys. Rev. D 83, 014017 (2011)
 [http://arxiv.org/abs/arXiv:1012.2784 Tests of Factorization and SU(3) Relations in B Decays into Heavy-Light Final States]
 End comment Niels Jul 2014-->
+<!-- ################################################# -->
+<!-- ################################################# -->
 <!-- Commented out 2014 Marcel
 {| border="1" cellpadding="2" cellspacing="0"
@@ Line 226: / Line 470: @@
 ! style="background:#3399ff;" | <font color=#ffffff> 2) Light Higgs search A0 -> mu+mu- </font>
 |}
 ''' Supervisors:''' Wouter Hulsbergen (staf), Pieter David (PhD)
 ''' Research description: '''
 Supersymmetry is potentially the key to understand the Dark Matter in the Universe.
 In supersymmetry, there is not just one Higgs boson as in the Standard Model,
@@ Line 243: / Line 482: @@
 This is a new project, within the small group at Nikhef (~3 persons). The analysis resembles the search for the
 decay Bs->mu+mu-, which was discovered this Summer and led to a lot of attention.
 ''' Relevant information: '''
 LHCb collaboration, arXiv:1307.5024
 [http://arxiv.org/pdf/1307.5024.pdf Measurement of the B0s->mu+mu- branching fraction and search for B0->mu+mu- decays at the LHCb experiment]
 End comment Marcel -->
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 <!-- Commented out Marcel 2014
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@@ Line 259: / Line 498: @@
 ''' Supervisors:''' Gerhard Raven (staf), Vasilis Syropoulos (PhD)
 ''' Research description: '''
@@ Line 275: / Line 512: @@
 This is a project that is closely related to the larger effort at Nikhef (~5 people) of measuring phi_s with
 Bs->J/psiPhi decays. Weekly video meetings with CERN coordinate the efforts within the LHCb collaboration.
 ''' Relevant information: '''
@@ Line 283: / Line 519: @@
 End comment Marcel -->
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 <!-- Commented out Nov 2014 by Niels (Georgios is on this project)
@@ Line 290: / Line 528: @@
 ! style="background:#3399ff;" | <font color=#ffffff> 2) Searching for Lorentz Invariance Violation with Bs -> J/psi phi decays </font>
 |}
 ''' Supervisors:''' Gerhard Raven (staf), Jeroen van Tilburg (Postdoc)
 ''' Research description: '''
@@ Line 303: / Line 537: @@
 This is a project that is closely related to the larger effort at Nikhef (~5 people) of measuring phi_s with
 Bs->J/psiPhi decays. Weekly video meetings with CERN coordinate the efforts within the LHCb collaboration.
 ''' Relevant information: '''
 Belle Collaboration: arXiv:1203.0930v2,
 [http://arxiv.org/pdf/1203.0930.pdf  Search for Time-Dependent CPT Violation in Hadronic and Semileptonic B Decays]
 End comment Niels Nov 2014 -->
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 <!-- Comment Marcel 2014
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@@ Line 319: / Line 553: @@
 ''' Supervisors:''' Francesco Dettori (postdoc), Antonio Pellegrino (staf), Siim Tolk (PhD)
 ''' Research description: '''
 The decay Sigma+ -> p mu mu is very rare in the Standard Model. In 2005 the
 HyperCP experiment has seen first evidence of this decay, but with a very peculiar
@@ Line 334: / Line 565: @@
 Python macros are used. This is a small project, where the student can perform
 his research in an independent way.
 This research will likely result in an official LHCb publication.
 ''' Relevant information: '''
-HyperCP Collaboration, Phys. Rev. Lett. 94, 021801 (2005)
+[1] HyperCP Collaboration, Phys. Rev. Lett. 94, 021801 (2005)
 [http://arxiv.org/abs/hep-ex/0501014 Evidence for the decay Sigma+ -> p mu mu]
+[2] X.-G. He, J. Tandean, G. Valencia, Phys. Rev. Lett. 98, 081802 (2007)
-X.-G. He, J. Tandean, G. Valencia, Phys. Rev. Lett. 98, 081802 (2007)
 [http://arxiv.org/abs/hep-ph/0610362 Has HyperCP Observed a Light Higgs Boson?]
 End comment Marcel -->
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 <!-- Commented out Marcel April 2016
@@ Line 356: / Line 584: @@
 ! style="background:#3399ff;" | <font color=#ffffff> 1) Bs->mumu and Bd->mumu normalization and B mesons hadronization probabilities </font>
 |}
 ''' Supervisors:''' Antonio Pellegrino (staff), Maarten van Veghel (PhD)
 ''' Research description: '''
@@ Line 388: / Line 614: @@
 ''' Relevant information: '''
 [1] R.Aaij et al. [LHCb Collaboration], ``Measurement of the fragmentation fraction ratio f_s/f_d and its
 dependence on B meson kinematics'', JHEP 04 (2013) 001 [arXiv:1301.5286 [hep-ph]].
 End comment Marcel April 2016 -->
+<!-- ################################################# -->
+<!-- ################################################# -->
 <!-- Commented out May 2015 by Niels (Siim, Maarten, Mick already on the project)
 {| border="1" cellpadding="2" cellspacing="0"
 |-
 ! style="background:#3399ff;" | <font color=#ffffff> 3) Measurement of pt and eta dependence of B0 and Bs0 production </font>
 |}
 ''' Supervisors:''' Niels Tuning (staf), ... ?
 ''' Research description: '''
 The relative production fractions ("fs/fd") of B0 (with quark content bd) and Bs0 (with quark content bs)
 mesons is crucial for the determination of the branching fraction of any Bs0 decay at the LHC. The most
@@ Line 420: / Line 644: @@
 ''' Relevant information: '''
 [1] R.Aaij et al. [LHCb Collaboration], ``Measurement of the fragmentation fraction ratio f_s/f_d and its
 dependence on B meson kinematics'', JHEP 04 (2013) 001 [arXiv:1301.5286 [hep-ph]].
 [2] R.Aaij et al. [LHCb Collaboration], ''Measurement of the B0s??+?? branching fraction and search for
 B0??+?? decays at the LHCb experiment'', Phys.Rev.Lett. 111 (2013) 101805  [arXiv:1307.5024 [hep-ph]]
 End comment Niels May 2015-->
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 <!-- Commented out Marcel April 2016
@@ Line 447: / Line 671: @@
 End comment Marcel April 2016 -->
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 <!-- Commented out Marcel April 2016
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 |-
@@ Line 458: / Line 681: @@
 ''' Supervisors:''' Jeroen can Tilburg (Vidi Laureate)
 ''' Research description: '''
 When two particles are created in an anti-symmetric wave function, the two particles are entangled, even though they may be separated by large distances.
 If one of the particles is forced into one state (projection), this determines the other state instantaneously. Several theoretical models,
@@ Line 468: / Line 689: @@
 End Comment Marcel April 2016-->
+<!-- ################################################# -->

Difference between revisions of "Master student Projects"

Latest revision as of 15:11, 15 February 2021

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