Difference between revisions of "Master student Projects"
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=== Master projects in the Nikhef B-physics group === | === 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" | {| border="1" cellpadding="2" cellspacing="0" | ||
|- | |- | ||
− | ! style="background:#3399ff;" | <font color=#ffffff> 1) | + | ! style="background:#3399ff;" | <font color=#ffffff> 1) Measurement of delta md </font> |
|} | |} | ||
− | '''Supervisor''' : | + | '''Supervisor''' : Niels Tuning (staff), Emmy Gabriel (postdoc), Michele Veronesi (PhD) |
'''Research Description:''' | '''Research Description:''' | ||
− | + | 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: ''' | ''' Relevant information: ''' | ||
− | |||
− | [2] [https://arxiv.org/abs/ | + | [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" | {| border="1" cellpadding="2" cellspacing="0" | ||
|- | |- | ||
− | ! style="background:#3399ff;" | <font color=#ffffff> | + | ! style="background:#3399ff;" | <font color=#ffffff> 3) BR(B0->D-pi+) and fd/fu with B+->D0pi+ </font> |
|} | |} | ||
− | ''' | + | '''Supervisor''' : Niels Tuning (staff), Emmy Gabriel (postdoc), Michele Veronesi (PhD) |
+ | |||
+ | '''Research Description:''' | ||
+ | |||
+ | The abundant decay B0->D-pi+ is often used as normalization channel, given its | ||
+ | clean signal, and well-known branching fraction, as measured by the B-factories. | ||
+ | However, this branching fraction can be determined more precisely, when comparing | ||
+ | to the decay B+->D0pi+ , which has a twice better precision. | ||
+ | |||
+ | In addition, the production of B0 and B+ mesons is often assumed to be equal, | ||
+ | based on isospin symmetry. The study of B+->D0pi+ and B0->D-pi+ allows for the | ||
+ | first measurement of this ratio, fd/fu. | ||
+ | |||
+ | 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://cds.cern.ch/record/2636716/files/CERN-THESIS-2018-137.pdf CERN-THESIS-2018-137] J. Butter, | ||
+ | Branching fraction measurement of B0->D+s pi? | ||
+ | |||
+ | |||
− | + | {| border="1" cellpadding="2" cellspacing="0" | |
+ | |- | ||
+ | ! style="background:#3399ff;" | <font color=#ffffff> 5) Searches for new pentaquarks </font> | ||
+ | |} | ||
− | + | '''Supervisor''' : P. Koppenburg (staff) | |
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
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− | |||
+ | '''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. | ||
+ | ''' 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). | ||
{| border="1" cellpadding="2" cellspacing="0" | {| border="1" cellpadding="2" cellspacing="0" | ||
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− | ! style="background:#3399ff;" | <font color=#ffffff> | + | ! style="background:#3399ff;" | <font color=#ffffff> 6) Measurement of the relative efficiency of muons and electrons with J/psi->ll decays </font> |
|} | |} | ||
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{| border="1" cellpadding="2" cellspacing="0" | {| border="1" cellpadding="2" cellspacing="0" | ||
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− | ! style="background:#3399ff;" | <font color=#ffffff> | + | ! style="background:#3399ff;" | <font color=#ffffff> 7) Very rare decays of B mesons</font> |
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{| border="1" cellpadding="2" cellspacing="0" | {| border="1" cellpadding="2" cellspacing="0" | ||
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− | ! style="background:#3399ff;" | <font color=#ffffff> | + | ! style="background:#3399ff;" | <font color=#ffffff> 8) Measurement of Central Exclusive Production Rates of Chi_c using converted photons in LHCb. </font> |
|} | |} | ||
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− | ! style="background:#3399ff;" | <font color=#ffffff> | + | ! style="background:#3399ff;" | <font color=#ffffff> 9) Optimization studies for Vertex detector at the High Lumi LHCb </font> |
|} | |} | ||
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{| border="1" cellpadding="2" cellspacing="0" | {| border="1" cellpadding="2" cellspacing="0" | ||
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− | ! style="background:#3399ff;" | <font color=#ffffff> | + | ! style="background:#3399ff;" | <font color=#ffffff> 10) Measurement of charge multiplication in heavily irradiated sensors </font> |
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============== | ============== | ||
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+ | | 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 | ||
+ | with silicon photo-multipliers (SiPM): the SciFi Tracker! | ||
+ | Nikhef plays a key role in the project, as we will build the | ||
+ | SciFi fibers modules, the cold-box enclosure housing the SiPMs, | ||
+ | and a large part of the on-detector electronics. In all these | ||
+ | areas, interesting test hardware and software has to be realized, | ||
+ | and several research topics for a Master project are available, | ||
+ | taking the student in contact with state-of-the-art particle detectors, | ||
+ | in a large team of physicists and engineers. Possible collaborations | ||
+ | with the Nikhef R&D group can also be envisaged. | ||
+ | --> | ||
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