CPviolation measurements Laura Zani Martin Sevior University of

CP-violation measurements (Laura Zani) Martin Sevior, University of Melbourne February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 1

CP-Violation Sakharov Conditions: Baryon number violation ●CP violation ●Interactions out of thermal equilibrium ● Antimatter (Not To Scale) Measured SM. Electroweak Baryogenesis limits this to 10 -26 => What causes this additional CPV? February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 3

CPV in the Standand Model CP Violation Through Mixing: CP Violation Through Interference: + Direct CP Violation: February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 4

CP-violation Direct CP Violation: February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 5

CKM Matrix Charmless B-decays February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 6

Time Dependent CP-Violation February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 7

Belle February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 8

Mode February 19, 2019 Theoretical Uncertainty Data 0. 01 0. 02 0. 10 0. 01 0. 09 -0. 05 0. 06 -0. 06 0. 12 0. 13 0. 08 0. 03+-0. 21 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 9

Strong Extra Diagrams For B+ decay Modified EWP? New Physics February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 10

2008 [R. Fleischer, S. Jäger, D. Pirjol, J. Zupan (2008)] 2018 R. Fleischer, R. Jaarsma, and K. K. Vos; PLB 785 (2018) 525; R. Fleischer, R. Jaarsma, E. Malami, and K. K. Vos; ar. Xiv: 1806. 08783 [hep-ph] February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 11

Belle II Flavour tag eff = 37% - 40% Belle Flavour tag eff = 30% February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 12

Kinematic Variables in BFactory measurements February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 13

Continuum Background • Continuum background( ): – Dominant background – Event topology differs from BB decays – Combined variables describing the event topology in an artificial neural network. Signal Continuum February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 14

(Melbourne analysis of Belle II MC) Timing resolution for Ks ~ 1. 17 ps (All charged tracks 0. 77 ps) 1 ab-1 February 19, 2019 5 ab-1 M. Sevior, Australian Accelerator based Particle Physics meeting Continuum background Signal 50 ab-1 Slide 15

1 ab-1 February 19, 2019 5 ab-1 M. Sevior, Australian Accelerator based Particle Physics meeting 50 ab-1 Slide 16

If SCP and ACP hold their central values we have >5 deviation with 5 ab-1 1 ab-1 50 ab-1 February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 17

Cabibbo and color suppressed tree And Penguin diagrams February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 18

Signal Sum Backgrounds Data Bin 0 Bin 1 Bin 2 Bin 3 Bin 4 August 14, 2017 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 19

C. -L. Hsu et al. Phys. Rev. D 96, 031101(R) (2017) Phase space August 14, 2017 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 20

• Need an order of magnitude increase in EW Tree diagram And an order of magnitude increase in Penguin diagram Both in 0. 99 Ge. V < MKK < 1. 1 Ge. V February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 21

The Full Challenge in 3 -body decays Results from LHCb Regions of phase space where ACP = 1 February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 22

Conclusions • February 19, 2019 M. Sevior, Australian Accelerator based Particle Physics meeting Slide 23

Thank you! August 14, 2017 M. Sevior, Flavour Physics, ICISE, Quy Nhon, Vietnam Slide 24

Backup August 14, 2017 M. Sevior, Flavour Physics, ICISE, Quy Nhon, Vietnam Slide 25

Phase space August 14, 2017 M. Sevior, Flavour Physics, ICISE, Quy Nhon, Vietnam Belle Slide 26