XXIV Workshop on Weak Interactions and Neutrinos - WIN'13

Session

Working Group 3

Sep 17, 2013, 9:00 AM

Natal, Brazil

Conveners

Working Group 3: Weak Decays, CKM and CP Violation - Chair: Cecilia Tarantino

• Cecilia Tarantino (University Roma Tre)
• Guy Wilkinson (University of Oxford (GB))
• Leandro Salazar De Paula (Univ. Federal do Rio de Janeiro (BR))

Working Group 3: Weak Decays, CKM and CP Violation - Chair: Leandro de Paula

• Leandro Salazar De Paula (Univ. Federal do Rio de Janeiro (BR))
• Guy Wilkinson (University of Oxford (GB))
• Cecilia Tarantino (University Roma Tre)

Working Group 3: Weak Decays, CKM and CP Violation - Chair: Cecilia Tarantino

• Cecilia Tarantino (University Roma Tre)
• Guy Wilkinson (University of Oxford (GB))
• Leandro Salazar De Paula (Univ. Federal do Rio de Janeiro (BR))

Working Group 3: Weak Decays, CKM and CP Violation - Chair: Guy Wilkinson

• Leandro Salazar De Paula (Univ. Federal do Rio de Janeiro (BR))
• Guy Wilkinson (University of Oxford (GB))
• Cecilia Tarantino (University Roma Tre)

Working Group 3: Weak Decays, CKM and CP Violation - Chair: Leandro de Paula

• Cecilia Tarantino (University Roma Tre)
• Guy Wilkinson (University of Oxford (GB))
• Leandro Salazar De Paula (Univ. Federal do Rio de Janeiro (BR))

Working Group 3: Weak Decays, CKM and CP Violation - Chair Cecilia Tarantino

• Leandro Salazar De Paula (Univ. Federal do Rio de Janeiro (BR))
• Guy Wilkinson (University of Oxford (GB))
• Cecilia Tarantino (University Roma Tre)

Working Group 3: Weak Decays, CKM and CP Violation - Chair Guy Wilkinson

• Cecilia Tarantino (University Roma Tre)
• Guy Wilkinson (University of Oxford (GB))
• Leandro Salazar De Paula (Univ. Federal do Rio de Janeiro (BR))

70. B-physics: status, and outlook after LS1 and LS2

Diego Guadagnoli (LAPTh Annecy)

9/17/13, 9:00 AM

Working Group 3

talk

I present an overview of the (major) progress recently made by experiment on various Bd- and Bs-meson decays, long awaited by theory. I also provide an outlook after LHC's LS1 and LS2 of the perspectives on these decays, as well as on novel related observables that will become accessible.

57. Recent results on CP and T Violation in B-meson decays from BaBar

Martino Margoni (Universita e INFN (IT))

9/17/13, 9:30 AM

Working Group 3

talk

We present the observation of Time-reversal asymmetry as well as a selection of recent results on CP violation effects in B-meson decays using a data set of about 430 fb-1 collected at the peak of the Y(4S), with the BABAR detector at SLAC. They include the measurements of processes sensitive to the angles of the Unitarity Triangle; studies of direct CP violation, and ...

3. Measurement of φs at LHCb

Francesca Dordei (Ruprecht-Karls-Universitaet Heidelberg (DE))

9/17/13, 10:00 AM

Working Group 3

talk

The study of CP violation in Bs oscillations is one of the key goals of the LHCb experiment. Effects are predicted to be very small in the Standard Model but can be significantly enhanced in many models of new physics. We present the world’s best measurement of the CP-violating phase φs using B0s → J/ψφ and B0s → J/ψππ decays, and a first study of mixing-induced CP violation in the decay B0s → φφ.

6. Measurement of semileptonic asymmetries in the B system at LHCb

Thomas Michael Bird (University of Manchester (GB))

9/17/13, 11:00 AM

Working Group 3

talk

LHCb has recorded large samples of semileptonic B decays. These provide potential to study CP violation effects in the B0 and Bs0 systems. Decay time-integrated or time-dependent asymmetries between charge-conjugate final states probe CP violation in B(s)0 mixing through the measurement of the parameter Afs (sometimes referred to as Asl). These measurements rely on data-driven techniques...

26. Recent results from Belle

Martin Sevior (University of Melbourne (AU))

9/17/13, 11:30 AM

Working Group 3

talk

After completing data taking in 2010, Belle has entered an intensive data analysis phase to complete the physics program for the experiment. This presentation will report preliminary results for the Branching Ratio and Direct CP violation for B--> pi0 pi0 together with final results for Belle's measurements of Direct and Indirect CP violation for B--> pi+ pi-. Taken together these results...

5. Studies of charmless B decays

Adlene Hicheur (CBPF - Brazilian Center for Physics Research (BR))

9/17/13, 12:00 PM

Working Group 3

talk

Decays of B hadrons without charmed particles in the final state offer rich opportunities to test the Standard Model. For example, CP violation in charmless charged two-body and three-body B decays provides ways to measure the CKM angle γ and to search for New Physics. The angular distributions of decays to vector-vector final states provide additional interesting observables. We present the...

94. Unitarity Triangle Analysis within and beyond the SM

Denis Derkach (University of Oxford (GB))

9/17/13, 5:30 PM

Working Group 3

talk

We present the summer 2013 update of the Unitarity Triangle (UT) analysis performed by the UTfit Collaboration within the Standard Model (SM) and beyond. We include as input for our analysis all the measurements available by August 2013. We also present the generalisation of the UT analysis to investigate new physics (NP) effects, updating the constraints on NP contributions to DeltaF = 2...

122. Lattice QCD inputs to test the Standard Model in the flavour sector

Dr Benoit Blossier (CNRS/Laboratoire de Physique Théorique d'Orsay)

9/17/13, 6:00 PM

Working Group 3

talk

Physics beyond the Standard Model can be tracked from direct measurements at the electroweak scale, for instance by searching new particles (Kaluza-Klein modes, supersymmetric particles, ...). Low energy processes and rare events can also be highly sensitive probes of New Physics: they are either mediated by virtual loops in which exotic particles can circulate or they occur at tree...

4. Measurement of γ from B→DK decays

Stefania Ricciardi (STFC - Science & Technology Facilities Council (GB))

9/17/13, 6:30 PM

Working Group 3

talk

The angle γ of the CKM unitarity triangle remains the least precisely measured parameter of the CKM mixing matrix. The precision measurement of this parameter is one of the main goals of the LHCb experiment. We present a wide range of measurements of CP violation and partial rates in B→DK decays, as well as the latest LHCb measurement of γ combining all the individual inputs.

88. K and D decays as probes of new physics

Joachim Brod (University of Cincinnati)

9/19/13, 11:00 AM

Working Group 3

talk

K and D decays provide important observables which allow for indirect searches for new particles. In this talk, I will review the status of the standard-model predictions and discuss new-physics contributions with a focus on rare decays and CP violation.

1. Charm mixing and CP violation

Mark Elliot Smith (University of Manchester (GB))

9/19/13, 11:30 AM

Working Group 3

talk

LHCb has collected the world's largest sample of charmed hadrons. This sample is used to search for direct and indirect CP violation in charm, and to measure D0 mixing parameters. Preliminary measurements from several decay modes are presented, with complementary time-dependent and time-integrated analyses

42. Status of SuperKEKB and Belle II

Pedro Podesta Lerma (Centro Invest. Estudios Avanz. IPN (MX))

9/19/13, 12:00 PM

Working Group 3

talk

Belle II, a next-generation B-factory experiment, will search for new physics effects in a data sample about 50 times larger than the one collected by its predecessor, the Belle experiment. The upgraded accelerator, SuperKEKB, is designed to have the maximum luminosity of 8 × 10^35 cm^−2s^−1, a factor 40 higher than the current world record. The status of the collider SuperKEKB and the...

2. Rare decays at LHCb

Jose Angel Hernando Morata (Universidade de Santiago de Compostela (ES))

9/19/13, 3:00 PM

Working Group 3

talk

Rare decays of beauty and charm hadrons and lepton flavour/number violating decays of tau leptons test the flavour structure of the underlying theory at the level of quantum corrections. They provide information on the couplings and masses of heavy virtual particles appearing as intermediate states. A review of recent results obtained by LHCb on these topics will be presented.

0. Quarkonia and quarkonia-like spectroscopy at LHCb

Maddalena Frosini (Universita & INFN, Firenze-Unknown-Unknown)

9/19/13, 3:30 PM

Working Group 3

talk

The latest years have seen a resurrection of interest in searches for exotic states motivated by tantalising observations by Belle and CDF. Using the data collected at pp collisions at 7 and 8 TeV by the LHCb experiment we present studies of the X(3872) properties as well as preliminary studies and prospects for studies of putative states such as the Z(4430)+

99. Beyond-SM searches in B -> D(*) tau nu and rare decays at BaBar

Denis Derkach (University of Oxford (GB))

9/19/13, 4:00 PM

Working Group 3

talk

We present the measurement of  the B -> D(*) tau nu decay, which is sensitive at tree level to New Physics in the form of a charged Higgs boson. The measured branching fraction is 3.4 sigma  larger than the SM predictions, and excludes the 2HDM of type 2 at 99.88% confidence for all tan(beta)/mHiggs values. Additional studies of the momentum transferred to the lepton system show...

72. Lepton Flavour Violation after the LHC searches.

Oscar M. Vives (IFIC and U: Valencia)

9/20/13, 9:00 AM

Working Group 3

talk

We review the role of LFV experiments in the search of new physics after the first LHC results. We highlight the importance of charged lepton flavour violation to look for new physics and improve our understanding on the physics of flavour. New sources of LFV are generally present in new physics beyond the Standard Model and because of the high sensitivity of LFV processes, LFV experiments...

84. A glance Beyond the Standard Model: the MEG experiment

Dr Simeone Dussoni (INFN Pisa)

9/20/13, 9:30 AM

Working Group 3

talk

The MEG experiment has been searching for the SM-supressed decay mu->e gamma with unprecedented sensitivity and recently improved down to 5.7*10**-13 the upper limit on the branching ratio of the mu->e gamma decay. This can help in putting severe constraints on proposed SM extensions. Aiming to further improve this limit we are planning an upgrade to reach a sensitivity of 5*10**-14.

91. Top as a probe for New Physics

Dr Aurore Savoy Navarro (Sezione di Pisa (IT) and CNRS/IN2P3)

9/20/13, 10:00 AM

Working Group 3

talk

As the heaviest particle of the Standard Model, the top has the largest coupling to the Higgs and is expected to play a special role in the theory of the electroweak breaking. For instance, the forward-backward asymmetry in t-tbar events recently observed at the Tevatron might be a signal of New Physics. A review of the many ways to look for New Physics through high precision measurements of...

37. Measurements with electroweak gauge bosons at LHCb

Murilo Santana Rangel (Univ. Federal do Rio de Janeiro (BR))

9/20/13, 11:00 AM

Working Group 3

talk

We report measurements of electroweak boson production in the forward region, using data collected at the LHCb experiment with a centre of mass energy of √s=7 TeV with an integrated luminosity of up to 1.0 fb–1. W and Z bosons are reconstructed in leptonic decay channels, and their cross-sections determined using data-driven techniques. All results are compared to NNLO predictions.

53. "Recent precision measurements in EWK physics" (from CDF)

Prof. Arie Bodek (University of Rochester)

9/20/13, 11:30 AM

Working Group 3

talk

We report on precision measurement of the electroweak mixing angle and an indirect measurement of the W mass extracted from the forward-backward asymmetry of e+e- and mu+mu- Drell-Yan events at CDF.

114. Measurements of vector bosons and vector bosons plus jet production with the ATLAS detector

Jane Theresa Cummings (Yale University (US))

9/20/13, 12:00 PM

Working Group 3

talk

Neutral and charged current Drell-Yan processes at the LHC provide unique tool to study various QCD and EW effects. Measurements differential in invariant mass of the lepton pair and lepton or pair rapidity are sensitive to the parton density functions. Measurements of the transverse momentum of the Z boson study QCD radiation effects. Lepton forward-backward asymmetry in the NC process...