Leptophilic new physics at the LHC Mikael Chala , F. del guila, Y. - PowerPoint PPT Presentation

Leptophilic new physics at the LHC Mikael Chala , F. del Águila, Y. Yamamoto & J. Santiago (Universidad de Granada) Based on JHEP 1403 (2014) 027 & CAFPE -183/14 Mikael Chala , VI CPAN Days, Sevilla

Outline Leptophilic Z' The properties of leptophilic physics Current and future constraints The limit of large masses LNV scalar interactions The nature of LNV scalars Current and future constraints Conclusions Mikael Chala , VI CPAN Days, Sevilla

Structure of leptophilic physics Vector 1 Scalar 1 0 0 non -renormalizable renormalizable lepton interactions lepton interactions lll & llll signals as other new physics (to be discussed later) Mikael Chala , VI CPAN Days, Sevilla

The renormalizable lagrangian of a leptophilic Z' 1 1 -1 -1 quantum number anomaly free, Foot et al '94 Mikael Chala , VI CPAN Days, Sevilla

LEP and LFV constraints Precision measurements at Z pole & above Z pole Sindrum & PSI Bell Collab. Carena et al '04 Mikael Chala , VI CPAN Days, Sevilla Mikael Chala , VI CPAN Days, Sevilla

LEP and LFV constraints Parameterize the lagrangian (up to taus) by means of and Cross section at the LHC given (to very good accuracy) by Mikael Chala , VI CPAN Days, Sevilla Mikael Chala , VI CPAN Days, Sevilla

Test these interactions in lll and llll final states Z-Z' mixing effects on Drell-Yan are model dependent Order fb at both LHC and ILC Aguila, Coughlan & Quirós '88, Holdom, '91, Aguila, Masip & Perez-Victoria, '95 Mikael Chala , VI CPAN Days, Sevilla

LHC reach is also shown in the pictures, while g-2 is only relevant for small masses [Ma, Roy & Roy, '02] Mikael Chala , VI CPAN Days, Sevilla

ILC reach (taus are also considered) Both Z' decays are included in any case, but a priori they can be splitted Mikael Chala , VI CPAN Days, Sevilla

Test these interactions in lll and llll final states Z-Z' mixing effects on Drell-Yan are model dependent Order fb at both LHC and ILC Aguila, Coughlan & Quirós '88, Holdom, '91, Aguila, Masip & Perez-Victoria, '95 Mikael Chala , VI CPAN Days, Sevilla

The limit of large Z' mass Can be also induced by Mikael Chala , VI CPAN Days, Sevilla

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 , VI CPAN Days, Sevilla

After integrating out scale, higher multiplets ( ) couple to same-sign leptons via Yukawa-like interactions and suppressed by powers of Off-diagonal couplings suppressed by LFV bounds Mikael Chala , VI CPAN Days, Sevilla

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 , VI CPAN Days, Sevilla

Using current CMS three- and four- lepton analyses , set bounds on LNV processes mediated by doubly-charged scalars Mikael Chala , VI CPAN Days, Sevilla

Using current CMS three- and four- lepton analyses , set bounds on LNV processes mediated by doubly-charged scalars Mikael Chala , VI CPAN Days, Sevilla

Conclusions Mikael Chala , VI CPAN Days, Sevilla

There are no signals of new physics at the LHC. So, either new physics is at a larger scale, or it is somehow elusive. Concerning leptophilic physics, LHC and ILC will be complementary, although no much room for ILC discovery. Higher scales can not be successfully tested in both colliders, but LNV could be efficiently searched for. Thank you! Mikael Chala , VI CPAN Days, Sevilla

Backup Mikael Chala , VI CPAN Days, Sevilla

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 (and observe signals of a charged channel) Mikael Chala , VI CPAN Days, Sevilla

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 Mikael Chala , VI CPAN Days, Sevilla