Lepton number violation in non-standard Higgs sectors Mikael Chala - PowerPoint PPT Presentation

Lepton number violation in non-standard Higgs sectors Mikael Chala (DESY) & Francisco del Águila (UGR) Based on JHEP 1403 (2014) 027, Phys.Lett. B725 (2013) 310 Mikael Chala, DISCRETE 2014, London

The discovery of the Higgs boson shows a very SM-like theory Alex Pomarol, CPAN 2014 Mikael Chala, DISCRETE 2014, London

Planck scale Model Many orders of magnitude of unknown physics? TeV scale EW scale Mikael Chala, DISCRETE 2014, London

Planck scale Hierarchy problem Model TeV scale EW scale Mikael Chala, DISCRETE 2014, London

Planck scale Hierarchy problem Model r e t t a M k r a D TeV scale EW scale Mikael Chala, DISCRETE 2014, London

Planck scale Hierarchy problem G r Model a v r e t t a i M t k r a D y TeV scale EW scale Mikael Chala, DISCRETE 2014, London

Planck scale Neutrino masses Hierarchy problem G r Model a v r e i t t a t M k r a y D TeV scale EW scale Mikael Chala, DISCRETE 2014, London

About Lepton Number Violation Majorana neutrinos... LNV ! Accidental from gauge symmetry the LHC ? Where to look for LN violation? Testable at decay Mikael Chala, DISCRETE 2014, London

Planck scale Natural assumption Model TeV scale EW scale Mikael Chala, DISCRETE 2014, London

Planck scale Natural assumption Model TeV scale EW scale Mikael Chala, DISCRETE 2014, London

Planck scale Natural assumption Model See for instance del Águila et al, 1204.5986 ; del Águila et al, 1111.6960 TeV scale EW scale Mikael Chala, DISCRETE 2014, London

Outline A generic approach to LNV scalars Can LNV scalar interactions be observed at the LHC? Distinguishing LNV scalars at the LHC RUN2 Mikael Chala, DISCRETE 2014, London

LNV extensions of the SM can accommodate neutrino Majorana masses Only three scalar fields at the renormalizable level Mikael Chala, DISCRETE 2014, London

LNV extensions of the SM can accommodate neutrino Majorana masses Only three scalar fields at the renormalizable level Different doubly-charged scalar at a lower scale can mix with Experiment scale Mikael Chala, DISCRETE 2014, London

After integrating out scale, higher multiplets ( ) couple to same-sign leptons via Yukawa-like interactions Mikael Chala, DISCRETE 2014, London

After integrating out scale, higher multiplets ( ) couple to same-sign leptons via Yukawa-like interactions and suppressed by powers of Mikael Chala, DISCRETE 2014, London

What is the phenomenology of these scalars? ATLAS E u r . P h y s . J VS C72-2244 CMS What current analyses assume (see-saw II)? E u r . P h y s . J C72-2189 Mikael Chala, DISCRETE 2014, London

Using current CMS three- and four- lepton analyses , set bounds on LNV processes mediated by doubly-charged scalars Mikael Chala, DISCRETE 2014, London

Mikael Chala, DISCRETE 2014, London

Mikael Chala, DISCRETE 2014, London

Mikael Chala, DISCRETE 2014, London

Mikael Chala, DISCRETE 2014, London

Using current CMS three- and four- lepton analyses , set bounds on LNV processes mediated by doubly-charged scalars Mikael Chala, DISCRETE 2014, London

Using current CMS three- and four- lepton analyses , set bounds on LNV processes mediated by doubly-charged scalars Mikael Chala, DISCRETE 2014, London

% n i s e i c n e i c i f f E F. del Águila and M.C. , 1311.1510 ( see also King, Merle and Panizzi, arXiv:1406.4137 )

Can we discriminate among the different multiplets? LNV can be very difficult to be established at the LHC But doubly-charged scalars can be still present Discrimination is possible if two-body decays dominate Measure the neutral cross section using four-lepton events arXiv:1305.3904 Mikael Chala, DISCRETE 2014, London

Distinguishing the different four-lepton channels Mikael Chala, DISCRETE 2014, London

Distinguishing the different four-lepton channels Mikael Chala, DISCRETE 2014, London

Distinguishing the different four-lepton channels Mikael Chala, DISCRETE 2014, London

Mikael Chala, DISCRETE 2014, London

How well can we discriminate among the different multiplets? - Only light 14 TeV, L = 100, 300, 3000/fb leptons - Light leptons and taus - Light leptons and Ws - Light leptons taus and Ws Águila, MC , Santamaría, Wudka, '13 Mikael Chala, DISCRETE 2014, London

Singlet case Doublet case Can be a background of Mikael Chala, DISCRETE 2014, London

Charged signals VS neutral current backgrounds Cut here mainly signal Mikael Chala, DISCRETE 2014, London

Conclusions Mikael Chala, DISCRETE 2014, London

The SM describes nature to a very good accuracy, although there are still open questions: neutrino masses LNV scalar interactions can be very difficult to be proved at the LHC For the first time, bounds on LNV scalar interactions, and many other channels Even if no LNV, doubly-charged scalars can be distinguished in a large run of LHC Thank you! Mikael Chala, DISCRETE 2014, London

What do we know on neutrino masses? Neutrinos can be Majorana Quantum numbers Singlet! Neutrino oscillations can not test the Majorana character Other fermions are charged, so they can not be self-conjugated Mikael Chala, DISCRETE 2014, London

Mikael Chala, DISCRETE 2014, London

Using current CMS three- and four-lepton analyses , bound non-LNV processes mediated by doubly-charged scalars Mikael Chala, DISCRETE 2014, London

Mikael Chala, DISCRETE 2014, London