Flavour Physics

Speaker: Andreas HoeckerConvener: Ewa Rondio

Sc.Secretary: Ulrik Egede

Orsay, 31’th January 2006

Is 50 ab–1 enough to do substantially better than the hadron colliders ?

If NP is doscovered at the LHC:

NP parameters cannot be measured model-independently in hadronic modes ?

requires precise measurement of leptonic and rare semi-leptonic modes ?

what can be done at LHC ? what is the required Super-B luminosity ?

If no NP is discovered at LHC: continue indirect search with all modes

How many of the rare modes will be systematics limited at 50 ab–1 ?

What is the timescale of the “proof of principle” of the linear Super-B factory ?

Can the linear Super-B factory also be /charm and factory ?

q u e s t i o n s

I guess that CERN's SPSC-P-326 K++ proposal should get our strong support ?

What about plans for an ambitious KL0 experiment at CERN ?

In which area is a 1034 fb–1 /charm factory better than a 1036 fb–1 Super-B factory ?

LFV importance boosted by neutrino discoveries. Can we build a e conversion experiment in Europe (CERN) ?

what is the required luminosity for a competitive measurement at Super-B ?

B P

hysi

csK

/

cLF

V

Contributions to the discussion• ILC/LHC synergies with flavour physics• Need for more studies of sensitivity and limits for b-factories and

ILC/LHC The current "Flavour at LHC" workshop attempts to address this point.• need of sensitivity plots for specific theories even if such plots are very model dependent, indeed need to do more work in this area

• LHC will give us new degrees of freedom in the flavour sector – We need a paradigm change in the flavour physics area to reflect

this.

Super B factories• plans for SuperKEKB • linear SuperB factory

What is the time scale of the linear super B ?… and what is the relative price in comparison to SuperKEKB ?

Total integrated luminosity: We saw the projections from KEK-B. What are they for a linear super B.

Capabilities: The linear superB has the possibilities of polarised beams and further flexibility of energy. Super KEK-B has a much stronger energy constraint.

Yamauchi’s Schedule for Super B

2004 05 06 07 08 09 10 11 12

KEKB SuperKEKB>1000fb-1

Calendar year

Crab cavityKEKBmachine

SuperKEKB const.

J-PARC 1 construction ILC constructionConstruct.fund

“Minor” upgrade “Major” upgrade (cost: 400M$)Belle

Operationfund

T2K

A Super B proposal was submitted from KEK to MEXT in August 2005.Window of oportunity for construction after 2008, cost 400M$

KEK open for discusion and colaboration welcomed

Super B Letter of Intent (KEK Report 2004-4) in April 2004

Super B Physics Reach50ab-1

CK

Mw

/ FC

NC

CPV

(b

s)

B

l

l’

3l

l Ks

B

109 108 107 106 105

Upper limit on Br

w/ improvement simple projection

linear superB lower energy options possible:• in the tau/charm region the loss of luminosity will be quite small, • if all the way down to the the luminosity may be a factor ~100 lower.possibility of polarization (what is the physics case ?) the study group is working, will provide a report during summer 2006• a possible timescale, • cost estimates • significant simulation work.Is linear superB a competitor to a super KEK-B ???• Answer not clear• rather not a competitor, but also comment that only one can be build• We should let the physics drive this.Other comment of B factories plans:• wait and see how well B physics can be done in the hadron

environment what is left after LHCb/ATLAS/CMS

Other points in the discussion:

* LHCb at high luminosity• LHCb will initially run at a luminosity of 2 x 1032 which is well below

the LHC design luminosity [different focusing in the LHCb int. point].

• There are studies now for running at luminosities up towards 1033. However it seems clear that SLHC will mean the end of LHCb.

** Latice calculation for flavour physics• Further lattice calculations will not be able to help us for ’/• For most other observables the precision should [by the time a super-B comes online] reach a precision of 2-4%. • We should also keep in mind that any new theory will introduce

flavour physics.

Opportunity to study Rare Kaon Decays

• K+ – Present result in agreement with SM within errors– Next round of exp. need to collect O(100) events to be useful – Proposal for in-flight decays: CERN P-326– Letter of Intent at J-PARC to continue the study with decays rest

• K0L

– Upper limit is 4 order of magnitude from the SM prediction– LOI to continue at J-PARC – KOPIO TERMINATED– Could be started at SPS and continued at SPS+

• K0L ee()

– Long distance contributions under good control– Measurement of KS modes has allowed SM prediction– KS rates to be better measured – Background limited (study time dep. Interference?)– 100-fold increase in kaon flux to be envisaged

Strong support

FRASCATI short Range Future

Change of machine layoutAdding: Superconducting cavities Superconducting wigglers Ramping Dipoles

Energy (cm) (GeV) 1.02 2.4Integrated Luminosity per year (ftbarn-1) 10

Total integrated luminosity (5 years, ftbarn-1) >50 3

Peak luminosity > (cm-1sec-2)

8 1032 1032

PHYSICS case• K physics• Nuclear physics• Nucleon form factors• Kaonic nuclei• Light source• Total cross section• physics

importance of a network of European labs.

In future – part of ILCdevelopement

-e- :

New project LOI to J-PARC: PRISM/PRIMEB(e conversion) < 10-19

- proposed in Japan, but can also be done in other places- Needs intensive proton beam

PRISM/ PRIME

Importance of Lepton Flavour Violation study

12Open Symposium, Orsay, Jan 30 – Feb 1, 2006 A. Höcker – The Challenge of Flavour Physics

Newphysics

Quark sectorLepton sectorEn

ergy

fron

tier

experiments,g–2, e, EDM, …

Super-B factory, LHCb, K experiments…

LHC, ILC

mass and mixingCPV and LFV

mass spectruminteractions

flavour mixingCPV phases

LFV CPV

“A Unified and Unbiased Attack on New Physics”

slide from: T. Browder, FNAL Seminar, 2006