The 8th International Workshop on the CKM Unitarity Triangle

Session

WG3

10 Sept 2014, 09:00

Vienna University of Technology

Conveners

WG3

• Thomas Blake (CERN)

WG3

• David Straub (Excellence Cluster Universe, Munich)

WG3

• Akimasa Ishikawa (Tohoku University (JP))

WG3

• David Straub (Excellence Cluster Universe, Munich)

WG3

• Akimasa Ishikawa (Tohoku University (JP))

20. Rare B decays at ATLAS

Sandro Palestini (CERN)

10/09/2014, 09:00

Study of rare and suppressed processes in B-mesons decays with ATLAS. Evidence for New Physics signatures is searched in weak decays that are naturally suppressed in the Standard Model, such us processes with flavour-changing neutral-currents. The measurement of the angular distribution in the decay of Bd into K*mu+mu- (K+pi-mu+mu-) and of the branching ratios for Bs (B0) into mu+mu- are...

21. Rare B decays at CMS

Gagan Mohanty (Tata Inst. of Fundamental Research (IN))

10/09/2014, 09:20

Rare B-meson decays especially those mediated by flavor-changing neutral current transition provide an excellent, indirect probe to search for new physics beyond the standard model. We discuss the newest and most interesting results on rare semileptonic b --> s l+l- decays from the CMS experiment at LHC. The results are based on 5.2 fb^-1 of proton-proton collision data recorded at the...

22. Rare b --> s ll decays at LHCb

Konstantinos Petridis (Imperial College Sci., Tech. & Med. (GB))

10/09/2014, 09:40

Rare b->sll transitions are excellent probes of physics beyond the Standard Model. We present the current status of rare b->sll measurements from the LHCb experiment and discuss the implications of these results in the context of new physics.

24. Theory of B --> K(*) mu+ mu-

Dr Javier Virto (Universitat Siegen)

10/09/2014, 10:00

Decay modes mediated by the transition b->sll, such as Bs->mumu and B->K(*)mumu, are currently under intensive experimental and theoretical scrutiny, mostly due to the latest measurements of their branching ratios and angular distributions. In this talk I will provide a comprehensive review of the theory of b->sll modes, the main theory uncertainties, recent developments and future challenges.

23. New physics in rare B decays

Wolfgang Altmannshofer (Perimeter Institute)

10/09/2014, 10:20

The first run of the LHC provided us with many new insights on rare leptonic and semi-leptonic B decays. Highlights were the first observation of Bs --> mu+mu- and improved results on B --> K mu+mu- and B --> K* mu+mu-, including first measurements of many angular observables. In this talk I will discuss the implications of the recent experimental results on rare leptonic and semi-leptonic...

25. Non-leptonic b --> s, d decays (experiment)

Fergus Wilson (STFC - Rutherford Appleton Lab. (GB))

10/09/2014, 11:15

26. Non-leptonic b --> s,d decays (theory)

Sebastian Jaeger (University of Sussex (GB))

10/09/2014, 11:35

I give a concise overview of the theory of charmless two-body B decays. These modes provide a large set of potential probes of BSM physics, but strong interactions are more challenging than in the simpler leptonic and semileptonic rare decays. I focus on the main qualitative features, rather than technical aspects, of the SM predictions, primarily invoking the heavy-quark expansion. Then I...

27. Bs,d --> mu mu (experiment)

Flavio Archilli (CERN)

10/09/2014, 11:55

28. Bs,d --> mu mu (theory)

Emmanuel Stamou (W)

10/09/2014, 12:15

The decay rate of the rare process B_s-> mu^+ mu^- is sensitive to small deviations from the Standard Model flavour structure and is thus used as an indirect probe for new physics. The decay rate has recently been observed by the CMS and LHCb collaboration for the first time and agrees with the SM expectations. In this talk I discuss recent progress in predicting the rate within the SM. I...

29. Lattice calculations for rare B decays

Dr Matthew Wingate (University of Cambridge)

10/09/2014, 12:35

Recent lattice QCD calculations of form factors relevant for $b\to s$ decays are briefly reviewed. Some time will be spent discussing prospects and ideas for further improvements.

30. Inclusive b --> s ll and b --> s gamma decays (theory)

Tobias Huber (University of Siegen)

11/09/2014, 09:00

I'll review the theory of inclusive B --> X_s ll transitions, and then present the latest results -- based on NNLO QCD + NLO QED corrections -- of all angular observables, as well as some NP sensitivities. I will also discuss the results of a dedicated Monte-Carlo analysis on the treatment of collinear photons. In the end I will briefly cover the results of four body contributions to B --> X_s...

31. Inclusive and exclusive b --> s ll and b --> s gamma decays at BaBar

Timothy Gershon (University of Warwick (GB))

11/09/2014, 09:20

32. Inclusive and exclusive b --> s ll and b --> s gamma decays at Belle

Yutaro Sato (Tohoku Univ.)

11/09/2014, 09:40

33. Inclusive and exclusive b --> s gamma decays (theory)

Emi Kou (LAL/IN2P3)

11/09/2014, 10:00

34. Radiative decays at LHCb

Jean-Francois Marchand (Centre National de la Recherche Scientifique (FR))

11/09/2014, 10:20

35. b --> s,d nu nu (experiment)

Alberto Lusiani (Scuola Normale Superiore and INFN Pisa)

11/09/2014, 11:15

We present the status of the experimental searches for flavour changing neutral current (FCNC) processes where a b hadron decays into light hadrons (X_d, X_s) and two neutrinos. Within the Standard Model, these processes are suppressed and rare, with branching fractions around 5*10^-6. Several New Physics models predict significant enhancements. Recent analyses by the Belle and BaBar...

36. b --> s,d nu nu (theory)

Jennifer Girrbach (Technical University Munich)

11/09/2014, 11:35

An analysis of the rare B decays B-> K^(*) nu nubar is presented both within the SM and beyond. A model independent approach is used and concrete NP models are studied as well. The relation between b-> s nu nubar and b-> s l^+ l^- transitions are analysed in detail.

37. Rare K decays (theory)

Joachim Brod (University of Cincinnati)

11/09/2014, 11:55

Rare K decays belong to the cleanest observables in flavor physics and are highly sensitive to heavy new particles. I review the status of the standard model predictions and also shortly discuss the new-physics expectations.

38. K --> pi nu nu at KOTO

koji shiomi (Kyoto university)

11/09/2014, 12:15

The KOTO experiment aims to discover the rare decay KL->pi0nunu at the J-PARC 30 GeV proton synchrotron. This mode violates the CP symmetry directly and is highly suppressed in the Standard Model. Thus the mode is sensitive to new physics beyond the SM, in particular the physics related to CP violation. KOTO is an upgrade of the E391a experiment at KEK, and includes a new CsI Calorimeter,...

39. K --> pi nu nu at NA62

Angela Romano (University of Birmingham (GB))

11/09/2014, 12:35

The main goal of the NA62 experiment at the CERN SPS is to measure the branching ratio of the ultra-rare K+ -> pi+ nu unbar decay with 10% accuracy. The NA62 strategy foresees the collection of ~ 100 K+ -> pi+ nu unbar decays in two years of data taking, keeping the background at the level of 10%. This measurement can provide stringent tests of SM predictions, also offering a complementary...

40. Rare D decays (theory)

S Fajfer (Univ. of Ljubljana and Inst. J. Stefan)

11/09/2014, 14:30

Rare D decays might serve as a test of FCNC transition in the up-quark sector. The presence of new physics in these decays is rather difficult to detect due to the contributions of SM long distance dynamics. Basic features of rare charm meson transitions within the Standard model and beyond are discussed. Chances to observe new physics signals are considered for inclusive c-> u...

41. Rare D decays (experiment)

Anze Zupanc (Jozef Stefan Institute)

11/09/2014, 14:50

42. Lepton Flavour Violation (theory)

Avelino Vicente (Université de Liège)

11/09/2014, 15:10

The field of lepton flavor violation will live an era of unprecedented developments in the near future, with dedicated experiments in different fronts. The observation of a flavor violating process involving charged leptons would be a clear evidence of physics beyond the Standard Model, thus motivating the great effort in this direction. Furthermore, in case a positive signal is found, a...

43. Muon LFV (experiment)

Yusuke Uchiyama (The University of Tokyo)

11/09/2014, 15:30

Search for the lepton flavor violation has long history and is now active area of the experimental search for physics beyond the Standard Model. Last year the MEG experiment, searching for the mu->e gamma decay, completed the data acquisition, leading to one of the most stringent constraints on building BSM models. The muon LFV search will be followed by several sophisticated experiments as...

44. Tau LFV (experiment)

Toru Iijima (Nagoya University)

11/09/2014, 15:50

The tau lepton, the heaviest charged lepton in the third generation, is a sensitive probe to New Physics (NP). In particular, lepton flavor violating (LFV) tau decays are of great interest, as many NP models predict their branching fractions in a range accessible by current and near future experiments. They also provide information of NP, complementary to LFV processes in the muon. In...