Precision tests of the Standard Model with Kaon decays at CERN

M Ziolkowski,V Kurshetsov,P Rubin,F Costantini,M Fiorini,V Kozhuharov,G Lamanna,M Martini,A Gonidec,B Hallgren,M Hita-Hochgesand,L Widhalm,F Bucci,M Moulson,P Valente,S Giudici,G Marel,B Bloch-Devaux,A Winhart,S Shkarovskiy,P Marouelli,W Baldini,I Polenkevich,M Lenti,O Yushchenko,T Numao,B Renk,L Masetti,B Peyaud,G Ruggiero,A Cotta Ramusino,A Fucci,U Moosbrugger,N Doble,C Morales Morales,T Spadaro,W Kubischta,L Dilella,A Nappi,M Patel,E Mazzucato,C Lazzeroni,M Scarpa,C Damiani,G Bocquet,R Fantechi,G Anzivino,A Gianoli,G Dellacasa,P Cenci,G Collazuol,M Markytan,G Saracino,H Dibon,B Vallage,V Obraztsov,M Serra,M De Beer,S Venditti,V Falaleev,F Marchetto,S Balev,M Sozzi,M Napolitano,Yu Potrebenikov,K Eppard,S Movchan,G Neuhofer,M Veltri,L Gatignon,M Shieh,M Behler,M Wache,M Holder,F Ambrosino,A Salamon,A Ceccucci,E Imbergamo,E Iacopini,M Fidecaro,S Gallorini,D Di Filippo,I Mannelli,E Gushchin,A Antonelli,C Biino,A Romano,H Wahl,I Mikulec,D Madigozhin,Max Wood ,M Szleper,A Walker,S A Wotton ,M Calvetti,A Zinchenko,F Petrucci,T Fonseca Martin,P Hristov,R Winston,Silvia Goy López ,G Kalmus,N Cabibbo,S Stoynev,M Clemencic,A Maier,C Cheshkov,L Fiorini,M Jeitler,M Raggi,A Norton,G Pierazzini,A Sergi,Mayda Velasco ,M W Slater ,J Derré,P Riedler,E Leonardi,J.B Chèze,F Retière,N Molokanova,M Savrié,G D’agostini ,R Piandani,S Bifani,I Popov,V Semenov,P Dalpiaz,J R Batley ,M Pepé ,M C Petrucci ,D.J Munday,H O Danielsson ,D Coward,V Palladino,D Cundy,A Peters,E Gersabeck,C Cerri,P Massarotti,E Goudzovski,A Bizzeti,V Kekelidze,A Dabrowski,M Misheva,P L Frabetti ,E Monnier,L Litov,A Michetti,R Arcidiacono,J Engelfried,V Duk,K Kleinknecht,R Wanke,M Piccini,M Valdata‐Nappi ,E C Swallow ,N Cartiglia,В.н Болотов

doi:10.1016/j.nuclphysbps.2015.09.270

M Ziolkowski, V Kurshetsov + Show 157 more

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https://doi.org/10.1016/j.nuclphysbps.2015.09.270

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Abstract

Effects of new physics in flavor could be found both in Flavor Changing Neutral Current (FCNC) processes and in Lepton Flavor Violation (LFV) modes. The former offer the possibility to deeply test the standard model in a clean environment, while the latter are sensitive to contribution from several models beyond the standard model. In the Kaon sector both FCNC and LFV will be investigated in the NA62 experiment. In addition the kaons sector is an ideal place where to look for new particles and tiny effects, in the region of hundreds of MeV/c2. In this paper prospects for exotic searches in NA62 will be presented, together with recent results from NA48/2 and NA62-RK on LFV kaon decays modes.

Highlights

After the Higgs discovery and the direct search of new particles at the energy frontier, it is becoming increasingly evident that the flavor physics provides a complementary tool to investigate the physics beyond the standard model
On one side the processes of flavor changing neutral current (FCNC) are a unique laboratory for studying flavor dynamics as described by the CKM matrix and possible extensions, on the other hand processes that violate lepton flavor (LFV) conservation are sensitive to the effects of new physics
We summarize the present status for the main LFV decay channels in charged kaon decays

Summary

Introduction

After the Higgs discovery and the direct search of new particles at the energy frontier, it is becoming increasingly evident that the flavor physics provides a complementary tool to investigate the physics beyond the standard model. The NA48/2 experiment beam line was designed to measure the CP violating charged asymmetry in the K → 3π decay [1]. Simultaneous positive and negative kaon beams were produced by 400 GeV/c protons from the SPS accelerator impinging on a beryllium target. In fig. a schematic view of the beam line is shown Both K+ and K− decays are collected concurrently in the NA48 detector, described in details elsewhere [2]. The charged particles produced in kaon decays (pions, muons and electrons) are measured by a straw tubes spectrometer (STRAW) integrated directly inside the evacuated decay region. Further details on the NA62 experiment can be found in Sergi’s proceedings for the same conference

LFV in Kaon Sector

Forbidden and exotics

Sterile Neutrinos

Dark Photon

Findings

Conclusions