Search for $K^0_s \to \mu^+ \mu^-$ and trigger developments at LHCb

Ramos Pernas, Miguel

Search for $K^0_s \to \mu^+ \mu^-$ and trigger developments at LHCb

Miguel Ramos Pernas
(
- Santiago de Compostela U.
)

2020

142 pages

Supervisors:

Diego Martínez Santos
,
Veronika Georgieva Chobanova
,
Jessica Prisciandaro
,
Cibrán Santamarina Ríos

Thesis: PhD

Santiago de Compostela U.

(2020)

Published: 2020

URN/HDL:

10347/23610

Experiments:

CERN-LHC-LHCb

pdf

reference search0 citations

Citations per year

0 Citations

Abstract: (U. Santiago de Compostela (main))

The SM is, up to now, a robust model that describes with high accuracy the interactionsbetween elementary particles. However, several processes, like the observation of neutrinooscillations or the presence of dark matter in the universe, constitute signs of physics beyondthis model. The LHCb experiment, located at the CERN, aims at contributing to clarify thepicture we currently have about particle physics, and to understand the laws that rule ouruniverse. By studying the decays of certain particles produced at the LHC, one can infer theexistence of new particles. These new particles might give extra degrees of freedom and,complementing the SM, would allow to explain other processes. This work constitutes asearch for physics beyond the SM in KS0 -> mu+ mu- decays, and the development ofreconstruction techniques and trigger configurations to study strange decays in the LHCbexperiment. In the first place, an overview to the theory of particle physics is presented. TheSM is explained, together with new theoretical proposals, and its relation with strange decays.A description of the LHCb detector follows the previous chapter, emphasizing the features thatmake this unique detector able to study strange decays. Afterwards, the search for the KS0 ->mu+ mu- decay at LHCb is presented, whose result constitutes up to date, the most stringentlimit on the branching fraction of this mode. To finalize, the upgrade of the LHCb detector isdiscussed, and a work on new reconstruction techniques for muons in this environment ispresented. These results are complemented with preliminar trigger studies for some strangedecays of interest, including KS0 -> mu+ mu-.

High Energy Physics
Particle Physics
Flavour Physics
LHC
LHCb
thesis
p p: scattering
p p: colliding beams
K0(S): leptonic decay
muon: pair production

References(122)

Figures(0)

[1]

Review of particle physics

K. Nakamura
(
- Tokyo U., IPMU and
- KEK, Tsukuba
)
,
K. Hagiwara
(
- KEK, Tsukuba
)
,
K. Hikasa
(
- Tohoku U.
)
,
H. Murayama
(
- LBL, Berkeley and
- UC, Berkeley and
- Tokyo U., IPMU
)
,
M. Tanabashi
(
- Nagoya U.
)

et al.

- J.Phys.G 37 (2010) 075021
•
DOI:
- 10.1088/0954-3899/37/7A/075021

[2]

The Standard model of particle physics

Mary K. Gaillard
(
- UC, Berkeley
)
,
Paul D. Grannis
(
- SUNY, Stony Brook
)
,
Frank J. Sciulli
(
- Columbia U.
)

- Rev.Mod.Phys. 71 (1999) S96-S111
•
e-Print:
- hep-ph/9812285
•
DOI:
- 10.1103/RevModPhys.71.S96

[3]

Wikimedia Commons, Standard Model, File:Standard Model of Elementary Particles.svg

[4]

Baryon asymmetry of the universe

A.D. Sakharov
(
- Lebedev Inst.
)

- ,
- Sov.Phys.Usp. 34 (1991) 5, 417-421,
- Usp.Fiz.Nauk 161 (1991) 5, 110-120
•
DOI:
- 10.1070/PU1991v034n05ABEH002504

[5]

An SU(2) Anomaly

Edward Witten
(
- Princeton U.
)

- Phys.Lett.B 117 (1982) 324-328,
- Preprint - WITTEN, E. (REC.SEP.82) 14p,
- Phys. Lett. B117 ( 1982) 324-328 and Preprint - WITTEN, E. (REC.SEP.82) 14p,
- In *Treiman, S.b. ( Ed.) Et Al.: Current Algebra and Anomalies*, 429-435. ( Phys. Lett. B117 ( 1982) 324-328) and Preprint - WITTEN, E. (REC.SEP.82) 14p,
•
DOI:
- 10.1016/0370-2693(82)90728-6

[6]

A Combination of preliminary electroweak measurements and constraints on the standard model

LEP and
ALEPH and
DELPHI and
L3 and
OPAL

Collaborations

e-Print:
- hep-ex/0103048

[7]

Sealing the fate of a fourth generation of fermions

Abdelhak Djouadi
(
- Orsay, LPT and
- CERN
)
,
Alexander Lenz
(
- CERN
)

- Phys.Lett.B 715 (2012) 310-314
•
e-Print:
- 1204.1252
•
DOI:
- 10.1016/j.physletb.2012.07.060

[8]

Direct evidence for neutrino flavor transformation from neutral current interactions in the Sudbury Neutrino Observatory

SNO

Collaboration

•

Q.R. Ahmad

et al.

- Phys.Rev.Lett. 89 (2002) 011301
•
e-Print:
- nucl-ex/0204008
•
DOI:
- 10.1103/PhysRevLett.89.011301

[9]

Measurement of the rate of $\nu_e+d \to p+p+e^-$ interactions produced by $^8$ B solar neutrinos at the Sudbury Neutrino Observatory

SNO

Collaboration

•

Q.R. Ahmad
(
- CENPA, Seattle and
- Whipple Observ. and
- Washington U., Seattle
)

et al.

- Phys.Rev.Lett. 87 (2001) 071301
•
e-Print:
- nucl-ex/0106015
•
DOI:
- 10.1103/PhysRevLett.87.071301

[10]

The Ultraviolet Behavior of Einstein Gravity

Marc H. Goroff
(
- Caltech
)
,
Augusto Sagnotti
(
- UC, Berkeley and
- LBL, Berkeley
)

- Nucl.Phys.B 266 (1986) 709-736
•
DOI:
- 10.1016/0550-3213(86)90193-8

[11]

G. ’t Hooft and M. J. G. Veltman, One loop divergencies in the theory of gravitation

- Ann.Inst.H.Poincare Phys.Theor.A 20 (1974) 69

[12]

An Improved experimental limit on the electric dipole moment of the neutron

C.A. Baker
(
- Rutherford and
- Sussex U. and
- Laue-Langevin Inst.
)
,
D.D. Doyle
(
- Rutherford and
- Sussex U. and
- Laue-Langevin Inst.
)
,
P. Geltenbort
(
- Rutherford and
- Sussex U. and
- Laue-Langevin Inst.
)
,
K. Green
(
- Rutherford and
- Sussex U. and
- Laue-Langevin Inst.
)
,
M.G.D. van der Grinten
(
- Rutherford and
- Sussex U. and
- Laue-Langevin Inst.
)

et al.

- Phys.Rev.Lett. 97 (2006) 131801
•
e-Print:
- hep-ex/0602020
•
DOI:
- 10.1103/PhysRevLett.97.131801

[13]

Spectroscopy 83 Miguel Ramos Pernas

V.C. Rubin
,
A. Century of Galaxy

- Astrophys.J. 451 (1995) 419

[14]

A Supersymmetry primer

Stephen P. Martin
(
- Northern Illinois U. and
- Fermilab
)

- ,
- Adv.Ser.Direct.High Energy Phys. 21 (2010) 1-153,
- Adv.Ser.Direct.High Energy Phys. 18 (1998) 1-98
•
e-Print:
- hep-ph/9709356
•
DOI:
- 10.1142/9789812839657_0001