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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:28 |
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Conference: Bucharest University Faculty of Physics 2021 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
The DsTau experiment (NA65): Study of tau neutrino production at the CERN-SPS
Authors:
Radu DOBRE (1,2), Elena FIRU (1), Ionel LAZANU (2), Titi PREDA (1)
Affiliation:
1) Institute of Space Science, Magurele, Ilfov
2) University of Bucharest, Faculty of Physics, Magurele, Ilfov
E-mail
radu.dobre7@gmail.com
Keywords:
tau-neutrino, cross-section, nuclear emulsions, Multiple Coulomb Scattering
Abstract:
The DsTau (NA65) is an approved CERN experiment begining with 2019 which is
proposing to study tau-neutrino production aiming to provide important information for future
tau-neutrino measurements.
First direct evidence of tau-neutrino interaction was reported by the DONUT (Direct
Observation of NU Tau) Collaboration in 2000, when they measured the tau-neutrino chargedcurrent
(CC) cross section, but this was done with a systematic uncertainty larger than 50%.
Therefore, one of our goals is to measure tau neutrino production and also to reduce the
systematic uncertainty in the cross section evaluation to the 10% level to test Lepton Universality
in neutrino scattering.
This can be realized by measuring the tau-neutrino production from the sequential decay
of the strange D meson, more specifically by knowing the double differential production cross
section of the Ds meson. Because there are several background events that can imitate the decays
of short lived particles, the Multiple Coulomb Scattering method for momentum estimation was
used to kill these events. For this, I wrote a program where I used the MCS method to test our
algorithms using real data and MC data generated with FLUKA and GEANT4.
The difficulty of measuring tau-neutrino production and interactions is due to the relative
rarity of the sources of tau-neutrino and difficulty to identify the short-lived tau-lepton
produced in tau-neutrino charged-current interactions. One of the best options is the use of
nuclear emulsions because they are the most suitable devices to detect the tau lepton, thanks to
their good spatial (~50 nm) and angluar resolution (~2 mrad).
For reaching the experiment’s goal, experimental set-up prototypes were exposed to a
400 GeV proton beam at CERN-SPS. At the same time, a considerable effort was paid for
software development used for data processing and MC simulations.
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