Heavy flavour phenomenology from lattice QCD

Gámiz, E.

doi:10.22323/1.120.0366

Cited by 4 publications

(6 citation statements)

References 25 publications

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“…In another set of simulations called S 2 , where we use the same value of the physical volume, we compute the corresponding quantities in the effective theory (at the 1/m b order) and match them to their QCD counterpart. This matching can be written in the following way: 5) where η and ϕ are computed by lattice simulations for different values of the lattice spacing a. In other words the matching equations determine the set of parametersω = ϕ −1 [Φ QCD − η].…”

Section: Computation Of the Relevant Hqet Parametersmentioning

confidence: 99%

“…Various strategies have been developed (see e.g. [3][4][5]) based on effective theories (NRQCD, HQET), on relativistic formulation (Fermilab, RHQ) or a combination of both. As already mentioned in the abstract, the strategy followed by the ALPHA collaboration is based on non-perturbative HQET in the static approximation and at the 1/m b order (see [6] for a pedagogical introduction).…”

Section: Introductionmentioning

confidence: 99%

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The b-quark mass and the heavy-strange decay constant from lattice HQET

Garrón¹

2011

Proceedings of 35th International Conference of High Energy Physics — PoS(ICHEP 2010)

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During the last years, the ALPHA collaboration has been developing and implementing a method based on Heavy Quark Effective Theory (HQET) to compute B-mesons observables through lattice simulations. Thanks to a non-perturbative matching to QCD, the theory is renormalizable at any order of the heavy quark mass expansion. In order to extract precisely the relevant matrix elements and masses, we use all-to-all propagators and solve an generalized eigenvalue problem (GEVP). We have shown in the quenched approximation that quantities like the b-quark mass m b , the heavy-light decay constant(s) or the B-meson spectrum can be computed precisely beyond the static approximation (including the first corrections in 1/m b ). More recently, we have started to include the sea quark effects, by working with N f = 2 light flavors of dynamical fermions [1] . The computation of the matching parameters is almost finished, but concerning the extraction of the hadronic quantities for which we use some CLS ensembles [2], only one lattice spacing has been analyzed so far. In this proceeding we report on the status of this project and present some preliminary results. The strategy is sketched in the following figure:

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Section: Computation Of the Relevant Hqet Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The b-quark mass and the heavy-strange decay constant from lattice HQET

Garrón¹

2011

Proceedings of 35th International Conference of High Energy Physics — PoS(ICHEP 2010)

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“…(3.5) has been determined by a non-perturbative matching at finite mass. The correspondence is 9) in terms of the conversion function C PS introduced in [31] and now known up to three loops [32][33][34]. For Z stat A,RGI we use the non-perturbative value from [21].…”

Section: Continuum Limitmentioning

confidence: 99%

“…LHCb has a potential to measure a branching ratio as small as 9 × 10 −9 at 3 σ with 0.1 fb −1 of data [7]. The hadronic parameter entering the SM prediction is the B s meson decay constant f Bs , which is known from the lattice with an uncertainty of about 15% [8,9].…”

Section: Introductionmentioning

confidence: 99%

HQET at order 1/m: III. Decay constants in the quenched approximation

Blossier

Morte²,

Garrón³

et al. 2010

J. High Energ. Phys.

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We report on the computation of the B s meson decay constant in Heavy Quark Effective Theory on the lattice. The next to leading order corrections in the HQET expansion are included non-perturbatively. We estimate higher order contributions to be very small. The results are extrapolated to the continuum limit, the main systematic error affecting the computation is therefore the quenched approximation used here. The Generalized Eigenvalue Problem and the use of all-to-all propagators are important technical ingredients of our approach that allow to keep statistical and systematic errors under control. We also report on the decay constant f B s of the first radially excited state in the B s sector, computed in the static limit

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“…For a more detailed discussion of the basis of these estimates, see (Brower et al 2007a). For recent reviews of the status of the lattice calculations see (Artuso et al 2008, Gamiz 2008, Wingate 2006 …”

Section: Sm ( Experimental Quantity ) ( Known ) ( Ckm ) ( Qcd Matrix mentioning

confidence: 99%

Scientific Challenges for Understanding the Quantum Universe

Khaleel¹

2009

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The scientific grand challenges for this field are described in several publications, including the High Energy Physics Advisory Panel's (HEPAP) Quantum Universe report and the P5 subcommittee's Long Range Plan for Particle Physics in the United States. From these, the following fundamental questions are posed: What are the main features of physics Beyond the Standard Model? These can be sought by exploring physics at high energy using the Large Hadron Collider (LHC), by seeking small departures from predictions made assuming Standard Model physics for interactions at lower energy, or by exploring physics with neutrinos. What is the identity of dark matter and how does large scale structure develop in the expanding universe? The prime dark matter candidate is a supersymmetric particle, but less massive particles called axions may also be involved. The primordial fluctuations out of which contemporary largescale structure grew may provide a window on fundamental processes occurring during the epoch of inflation. What are the empirical properties of dark energy and what do they imply about its nature? Present evidence involving observations of supernova explosions and the growth of perturbations in the expanding universe is consistent with it having the properties of Einstein's cosmological constant.Departures from this behavior may signify the presence of new physics operating over cosmological scales. What are the reasons for and implications of neutrino masses? The measured properties of neutrinos provide an existence proof for important physics Beyond the Standard Model (BSM) but may also lead to an explanation of why there is a net preponderance of matter over anti-matter. Astrophysical arguments also contribute to the answer. Are there extra dimensions beyond the three spatial and single temporal dimensions familiar from everyday experience? These may have tiny length scales as suggested by string theory or may have macroscopic scales that can lead to a weakening of the law of gravity. How do Nature's particle accelerators operate in extreme environments? Ultra high energy cosmic rays are accelerated by cosmic sources possibly associated with massive black holes to energies as high as 1 ZeV. When these cosmic rays hit the Earth's atmosphere, they do so with center of momentum energies in excess of 100 TeV. While we can observe cataclysmic events such as a supernova explosion or the collapse of a massive star into a black hole from a vast distance, these involve phenomena that can never be reproduced in a terrestrial laboratory. However, it becomes increasingly possible to recreate these conditions in a digital universe where important questions can be asked and alternatives explored.The planning and design of the International Linear Collider (ILC) is critical for the next step in high energy physics. How can we be certain that this expensive machine will work when it is turned on? Instead of building a series of increasingly costly prototypes, accelerator physicists turn with increasing sophistication...

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Heavy flavour phenomenology from lattice QCD

Cited by 4 publications

References 25 publications

The b-quark mass and the heavy-strange decay constant from lattice HQET

The b-quark mass and the heavy-strange decay constant from lattice HQET

HQET at order 1/m: III. Decay constants in the quenched approximation

Scientific Challenges for Understanding the Quantum Universe

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