Prof.
Juan Antonio Aguilar Saavedra
(University of Granada and Laboratorio de Instrumentacao e Fisica Experimental (LIP))
11/04/2011, 09:40
If the forward-backward asymmetry in t tbar production at Tevatron
is due to new physics, it also implies an enhancement of the t tbar tail at
LHC. This could be used to exclude many of the proposed explanations, already
with the data collected in 2010. Some other possibilities which do not give a
too large tail are discussed, as well as other possible signals.
Dr
Susanne Westhoff
(Mainz University)
11/04/2011, 10:05
Strongly-coupling heavy gauge bosons are predicted in various extensions of the Standard Model. Examples are Kaluza-Klein gluons from extra dimensions or axigluons in models with an enlarged gauge symmetry. I report generic constraints from precision observables and direct production at the LHC. Given these constraints, I discuss the effects of massive colour-octet bosons in top-antitop-quark...
Paride Paradisi
(Technische Universitat Munchen (TUM))
11/04/2011, 10:50
After a brief review of the status of the flavor physics phenomenology
in the SM, I will focus on possible non-standard signals predicted by
theories beyond the SM (especially Supersymmetry) in the flavor phenomenology of heavy fermions.
Prof.
Ulrich Nierste
(Karlsruhe Institute of Technology (KIT))
11/04/2011, 11:15
The 2010 data on quark flavour physics reveal a considerable tension
with the Standard Model. However, an excellent fit is found if one
permits new physics in the amplitudes describing meson-antimeson mixing in the B_d and B_s systems. The corresponding global analysis disfavours the Standard Model at the level of 3.6 standard deviations and calls for new sources of CP violation in the...
Dr
Andreas Crivellin
(ITP Bern)
11/04/2011, 12:05
In the MSSM self-energies can be enhanced either by tan(beta) or by the trilinear A-terms and therefore lead to order one corrections.
In this talk I show how these large corrections can be resummed to all order in perturbation theory. This resummation results in effective gluino, chargino, neutralino and Higgs boson vertices. Using these vertices all chirally enhanced effects can be...
Prof.
Jan Olav Eeg
(University of Oslo)
11/04/2011, 14:30
I present a model for the color suppressed decay mode B^0 --> 2 \pi^0. The model is an extension of (heavy-light) chiral quark models.
The color suppressed (nonfactorizable) decay mode is obtained in terms of a model dependent gluon condensate. The model can account for the experimental result. Unfortunately, the theoretical result obtained within the model is very sensitive to the two...
Paolo Gambino
(Turin U and INFN)
11/04/2011, 14:55
I will review the determination of Vcb and Vub from semileptonic B decays, focussing on inclusive decays and discussing the extraction of the c and b quark masses from a theoretical point of view.
Giulia Ricciardi
(Dip. di Scienze Fisiche Univ. Napoli Federico II)
11/04/2011, 15:20
We discuss resummed formulae in semileptonic decays of a heavy quark $h$
into a quark $q$ plus a non-hadronic final state, including mass effetcs
of the final quark.
Dr
Luis Oliver
(Laboratoire de Physique Théorique Université de Paris-Sud)
11/04/2011, 15:45
The Isgur-Wise functions are expressed in terms of scalar products of states of the light cloud in a Hilbert space, related by Lorentz transformations. This fact leads to strong constraints on their possible shape.
Prof.
Gustavo C. Branco
(Instituto Superior Tecnico (IST))
11/04/2011, 16:30
We emphasize the role of Heavy Fermions in various aspects of fundamental physics such as:
i) Generating all CP violations from a vaccum phase.
ii) Generating Naturally Suppressed Deviations of 3x3 Unitarity
and Flavour-Changing Neutral Currents.
iii) Providing a Possible Solution to the Strong CP problem.
iv ) Impact on CP Asymmetries
Margarida Nesbitt Rebelo
(UTL/CFTP/IST)
11/04/2011, 16:55
We construct extensions of the Standard Model with two Higgs doublets, where there are flavour changing neutral currents both in the quark and leptonic sectors, with their strength fixed by the fermion mixing matrices $V_{CKM}$ and $V_{PMNS}$. These models are an extension to the leptonic sector of the class of models previously considered by Branco, Grimus and Lavoura, for the quark sector....
Prof.
Ivica Picek
(Phys. Dept., University of Zagreb)
12/04/2011, 09:25
We study the phenomenology of
Dirac fermion 5-plets leading to the tree-level seesaw different from
standard type I and III. They give rise to the seesaw formula m_{nu} ~ v^6/M^5
which reproduces masses for light neutrinos m_{nu} ~ 10^{-1} eV by M > TeV new states, testable at the LHC.
Their Drell-Yan production rates are enhanced due to the
enlarged effective gauge couplings, and...
Dr
Sogee Spinner
(University of Wisconsin-Madison)
12/04/2011, 09:50
An exciting prospect for LHC physics is the lepton number violating signals associated with Majoarana neutrino mass generation. Such signals crucially depend on the nature of the associated seesaw fields and could be absent (even for fields with LHC-friendly masses) if these fields cannot be easily produced. A startling exception is the recently proposed colorful seesaw where the color...
Diego Aristizabal
(Universite de Liege)
12/04/2011, 10:15
In type-III seesaw the generation of a lepton asymmetry proceeds via the dynamics of Majorana electroweak triplets. In this talk I will discuss the importance of flavor effects in this type of models, in particular the impact that such effects can have for TeV-scale triplets. I will show that as long as the asymmetry is produced by the
dynamics of the lightest triplet flavor effects are...
Fulvia De Fazio
(INFN)
12/04/2011, 11:25
I discuss the possibility of determining the Bs-Bsbar mixing phase from nonleptonic Bs decays to a charmonium state and a light meson, induced by the b \to c cbar s transition.
In particular, I consider the mode Bs \to J/psi f0(980).
Prof.
Alexander Lenz
(TU Munich)
12/04/2011, 11:50
We present a strategy to search model independently for new physics. In that respect we also review the theoretical status of the standard model predictions for mixing observables. Finally we discuss the effects of a heavy fourth family to B mixing.
Prof.
Robert Fleischer
(Nikhef)
12/04/2011, 12:15
We have just entered a new round in the testing of the flavour sector of the Standard Model
through high-precision measurements of $B$-meson decays. While the last decade has revealed
many new insights thanks to the interplay between theory and the $B$-decay data, there is still a
largely unexplored territory of the $B$-physics landscape left for the LHC and improved analyses
at the...
Dr
Emi Kou
(LAL/IN2P3)
12/04/2011, 15:00
We propose to investigate the charmonium production and spectroscopy using their decays to p pbar final state at LHCb. The yield of J/ψ → p pbar is estimated to be about 60 events/pb−1 at √s = 7 TeV, which should be achieved soon. We will also discuss a potential re-discovery of the hc state at LHCb using the p pbar final state.
Prof.
Zenro Hioki
(University of Tokushima)
12/04/2011, 15:25
Through top-quark pair productions at Tevatron/LHC, we study possible effects of anomalous top-gluon couplings yielded by SU(3)xSU(2)xU(1) invariant dimension-6 effective operators. We calculate the total cross section and also some distributions for pp/ppbar -> ttbar X as functions of two anomalous-coupling parameters, i.e., the chromoelectric and chromomagnetic moments of the top. We show...
Jure Drobnak
(Jozef Stefan Institute)
12/04/2011, 15:50
I will present our recent study on anomalous tWb couplings in minimal flavor violating models. On one hand we examine the effects such couplings might have on the helicity fractions of the W-boson produced in the main decay channel of the top quark and on the other hand, how such couplings can affect B-meson mixing.
Zoltan Ligeti
(Lawrence Berkeley National Laboratory)
12/04/2011, 16:20
It is often assumed that the first evidence for direct dark matter detection will come from experiments probing spin-independent interactions, because of higher sensitivities due to coherence effects. We explore the possibility of models that would be invisible in such experiments, but detectable via spin-dependent interactions. The existence of much larger (or only) spin-dependent tree-level...
Tzu-Chiang Yuan
(Academia Sinica)
12/04/2011, 16:45
Using an effective interaction approach to describe the interactions between the dark matter particle and the light degrees of freedom of the standard model, we calculate the antiproton flux due to the annihilation of the dark matter in the Galactic Halo and compare to the most recent antiproton spectrum of the PAMELA experiment. We obtain useful constraints on the size of the effective...
Christopher Smith
(IPN Lyon)
12/04/2011, 17:10
FCNC are suppressed in the Standard Model, and thus constitute our best tools to search for New Physics in low-energy flavor experiment. In this talk, the phenomenology of the s ---> d gamma transition is analyzed. In a first part, the anatomy of the Standard Model contributions is reviewed, emphasizing the similarities and differencies with that of b ---> s gamma. Besides, it is shown that...
Prof.
Berthold Stech
(Heidelberg University)
13/04/2011, 09:15
The combination of flavor symmetry with grand unification is considered. The flavor group SO(3) is used. For the flavon fields (singlets with respect of the GUT group) and the Higgs fields (singlets with respect to the generation group) a simple form for the effective potentials is postulated. It is applied to describe the spontaneous symmetry breaking of flavon fields which are responsible ...
Michal Malinsky
(IFIC/CSIC and University of Valencia)
13/04/2011, 09:40
In SO(10) unifications with extended matter sector some of the drawbacks of the traditional models can be resolved. On one hand, it is easy to smear the down-quark - charged-lepton Yukawa degeneracy, yet without large Higgs representations. In the flipped variant, supersymmetric SO(10) can be broken down to the SM at the renormalizable level even with multiplets not bigger than the adjoint.
Prof.
Ilja Dorsner
(University of Sarajevo)
13/04/2011, 10:05
The measured forward-backward asymmetry in the top pair production at Tevatron might be explained by exchange of an additional colored weak singlet. This state emerges naturally in a theoretically well-motivated class of grand unified models and it has some unique properties.
Namely, it interacts with the up-quarks only when they are from different generations. It is also a leptoquark as it...
Gilad Perez
(Weizmann Institute)
13/04/2011, 10:50
We study the various theoretical and experimental implications for the recent $t \bar t$ forward backward asymmetry measurements done by the CDF collaboration.
Prof.
alexander kagan
(university of Cincinnati)
13/04/2011, 11:15
We show that the forward-backward asymmetry in top quark pair production can be enhanced by fields that transform nontrivially under the flavour group and satisfy Minimal Flavour Violation, while at the same time the constraints from associated effects on the dσ(t¯t)/dMt¯t distribution, dijet resonance searches, same sign top pair production and other phenomenology are satisfied. We focus on the...
Prof.
francesco Sannino
(CP3-Origins)
13/04/2011, 14:30
Imagine to discover a new fourth family of leptons at the Large Hadron Collider (LHC) but no signs of an associated fourth family of quarks. What would that imply? An intriguing possibility is that the new fermions needed to compensate for the new leptons gauge anomalies simultaneously address the big hierarchy problem of the Standard Model. A natural way to accomplish such a scenario is to...
Dr
Blazenka Melic
(Rudjer Boskovic Institute)
13/04/2011, 14:55
By constructing and employing global, unique fit for the fourth generation mass mixing matrix within the Standard model with the 4th generation quarks b' and t', we examine CP-violating phenomena in flavor changing neutral current processes t -> cX; b'-> sX, b'-> bX,t'-> cX, and t'-> tX, with X=Z,H,gamma,g
and discuss their effects on the global CPV picture.
Nejc Košnik
(LAL)
13/04/2011, 15:20
Combined analysis of meson mixings and EW precision observables in 4th generation SM.
Alejandra Melfo
(U. de Los Andes)
13/04/2011, 15:45
We study the possibility of the existence of extra fermion families and an extra Higgs doublet. We find that requiring the extra Higgs doublet to be inert leaves ample space for three extra families and marginally accommodates four, allowing for mirror fermion families and a dark matter candidate at the same time. The emerging scenario is very predictive: it consists of a heavy Standard Model...
Gerhard Buchalla
(LMU Munich)
13/04/2011, 17:00
We discuss a systematic framework for exclusive rare B decays
of the type B -> K(*) l+l- at large dilepton invariant mass q^2.
It is based on an operator product expansion (OPE) for the required
matrix elements of the nonleptonic weak Hamiltonian in this kinematic
regime. Matrix elements of subleading terms in the OPE are computed
explicitly and a quantitative estimate of duality...
Sébastien Descotes-Genon
(LPT)
13/04/2011, 17:25
I discuss how current and (some) future observables on inclusive and exclusive radiative b decays can be combined to constrain on the Wilson coefficients of the effective Hamiltonian and discriminate between the Standard Model and some scenarii of New Physics.
Dr
Stephane Lavignac
(IPhT, CEA-Saclay)
14/04/2011, 09:00
One notoriously difficult problem in perturbative gauge mediation of supersymmetry breaking via messenger fields is the generic presence of a phenomenologically unacceptable vacuum with messenger vevs, with a lower energy than the desired (MSSM) vacuum. We investigate the possibility that quantum corrections promote the latter to the ground state of the theory, and find that this is indeed...
Dr
Yue Zhang
(Abdus Salam ICTP)
14/04/2011, 09:25
The fate of R-parity is one of the central issues in the minimal supersymmetric standard model. Gauged $B-L$ symmetry provides a natural framework for addressing this question. I will study the theory and phenomenology in a class of models where gauged R-parity is spontaneously broken at TeV, including the predictions of neutrino masses and the signature for such theories to be detected at the LHC.
Dr
Monika Blanke
(Cornell University)
14/04/2011, 09:50
I discuss the potential of measuring CP violation in three body decays, paying particular attention to the different possible origins of the "strong" CP-even phase. This phase can be obtained from the propagation of intermediate state particles - either when diagrams with different intermediate particles interfer, or when the intermediate state is off-shell by a different amount. I will...
Prof.
Amon Ilakovac
(Univ. of Zagreb)
14/04/2011, 10:15
We investigate the influence of the boundary conditions of minimal
supergravity (mSUGRA) on the supersymmetric mechanism for lepton
flavour violation (LFV) proposed recently [1], within the
framework of the MSSM extended by TeV-scale singlet heavy neutrinos.
We find that the consideration of the mSUGRA boundary condition may
increase the branching ratios of ...
Juan Antonio Aguilar Saavedra
(University of Granada and Laboratorio de Instrumentacao e Fisica Experimental (LIP))
I will discuss several processes of single and top pair production mediated by four-fermion operators and the future prospects for LHC.
Stefan Pokorski
(Institute of Experimental Physics)
In many models, the flavour hierarchies among SM fermions are generated directly or indirectly through their dynamical mixing with new heavy (vector-like) fermions. Various predictions of such models for the FCNC and CP violation effects, generated by the presence of the heavy fermions, will be discussed.
