<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">|</mml:mo><mml:msub><mml:mi>V</mml:mi><mml:mrow><mml:mi>c</mml:mi><mml:mi>d</mml:mi></mml:mrow></mml:msub><mml:mo stretchy="false">|</mml:mo></mml:math>from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi></mml:math>meson leptonic decays

Na, Heechang; Davies, C. T. H.; Follana, E.; Lepage, G. Peter; Shigemitsu, J.

doi:10.1103/physrevd.86.054510

Cited by 78 publications

(117 citation statements)

References 33 publications

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“…As a consequence of these two effects the f Ds puzzle has gone away. For f D , HPQCD has studied the effect of improving the scale determination this year [89], finding a results that is in very good agreement with the older one [86] and slightly more accurate. First calculations for the D and D s decay constants that include the contribution of the charm quark in the sea (i.e.…”

Section: Charm Physicsmentioning

confidence: 54%

Lattice Flavour Physics with an eye to Super-B

Tarantino¹

2012

Proceedings of the 30th International Symposium on Lattice Field Theory — PoS(Lattice 2012)

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Section: Charm Physicsmentioning

confidence: 54%

Lattice Flavour Physics with an eye to Super-B

Tarantino¹

2012

Proceedings of the 30th International Symposium on Lattice Field Theory — PoS(Lattice 2012)

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“…[39] and f Ds /f D = 1.187 (12) at N f = 2 + 1 from Refs. [41,43]. Notice the remarkable precision for the double ratio (32), which means that SU(3) breaking effects in the ratio of PS meson decay constants are the same in the light and charm sectors within a percent accuracy.…”

Section: Determination Of |V Us |mentioning

confidence: 99%

Leptonic decay constantsfK,fD, andfDswith
Carrasco
¹
,
Dimopoulos
²
,
Frezzotti
³

et al. 2015
Phys. Rev. D
122
14
102
0
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We present a lattice QCD calculation of the pseudoscalar decay constants f K , f D and f Ds performed using the gauge configurations produced by the European Twisted Mass Collaboration with N f = 2 + 1 + 1 dynamical quarks, which include in the sea, besides two light mass degenerate quarks, also the strange and charm quarks with masses close to their values in the real world. The simulations are based on a unitary setup for the two light mass-degenerate quarks and on a mixed action approach for the strange and charm quarks. We use data simulated at three different values of the lattice spacing in the range 0.06 ÷ 0.09 fm and at pion masses in the range 210 ÷ 450 MeV. Our main results are:

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“…With this formalism, c quarks are analyzed in the same way as u, d, and s quarks, which greatly reduces the uncertainties in QCD simulations of D physics [2][3][4][5][6][7]. More recently we showed that the HISQ action can be pushed to much higher masses -indeed, very close to the b mass -using new lattices, from the MILC collaboration, with the smallest lattice spacing available today (a = 0.044 fm).…”

mentioning

confidence: 99%

High-precisionfBsand heavy quark effective theory from relativistic lattice QCD

et al. 2012

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We present a new determination of the Bs leptonic decay constant from lattice QCD simulations that use gluon configurations from MILC and a highly improved discretization of the relativistic quark action for both valence quarks. Our result, fB s = 0.225(4) GeV, is almost three times more accurate than previous determinations. We analyze the dependence of the decay constant on the heavy quark's mass and obtain the first empirical evidence for the leading 1/ √ m h dependence predicted by Heavy Quark Effective Theory (HQET). As a check, we use our analysis technique to calculate the mB s − mη b /2 mass difference. Our result agrees with experiment to within errors of 11 MeV (better than 2%). We discuss how to extend our analysis to other quantities in Bs and B physics, making 2%-precision possible for the first time. Lattice simulations of QCD have become essential for high-precision experimental studies of B-meson decays -studies that test our understanding and the limitations of the standard model of weak, electromagnetic and strong interactions, and also determine fundamental parameters, like the CKM matrix, in that model. Accurate theoretical calculations of QCD contributions to meson masses, decay constants, mixing amplitudes, and semileptonic form factors are critical for this program, and lattice simulation is the main tool for providing these calculations. A major complication for the lattice simulations has been the large mass of the b quark, which has necessitated the use of non-relativistic effective field theories like NRQCD to describe b dynamics in the simulations. The need for effective field theories has made it difficult to achieve better than 5-10% precision for many important quantities.Recently we overcame the analogous problem for c quarks by introducing a highly improved discretization of the relativistic quark action that gives accurate results even on quite coarse lattices: the Highly Improved Staggered-Quark (HISQ) discretization [1]. With this formalism, c quarks are analyzed in the same way as u, d, and s quarks, which greatly reduces the uncertainties in QCD simulations of D physics [2][3][4][5][6][7]. More recently we showed that the HISQ action can be pushed to much higher masses -indeed, very close to the b mass -using new lattices, from the MILC collaboration, with the smallest lattice spacing available today (a = 0.044 fm). This allowed us to extract a value for the b's MS mass that was accurate to better than 1%. Here we extend that work in a new analysis of the B s meson's leptonic decay constant f Bs , which produces the most accurate theoretical value to date.We also compute the mass difference m Bs − m η b /2, as an additional test of our analysis method. This difference is particularly sensitive to QCD dynamics because the leading (and uninteresting) dependence on the heavy quark's mass mostly cancels in the difference.It would be quite expensive to extend our new analysis directly to B-meson quantities, because of the added costs associated with very light valence and sea qua...

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|Vcd|fromDmeson leptonic decays

Cited by 78 publications

References 33 publications

Lattice Flavour Physics with an eye to Super-B

Lattice Flavour Physics with an eye to Super-B

Leptonic decay constantsfK,fD, andfDswith
Carrasco
¹
,
Dimopoulos
²
,
Frezzotti
³

et al. 2015
Phys. Rev. D
122
14
102
0
View full text Add to dashboard Cite

High-precisionfBsand heavy quark effective theory from relativistic lattice QCD

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|Vcd|fromDmeson leptonic decays

Cited by 78 publications

References 33 publications

Lattice Flavour Physics with an eye to Super-B

Lattice Flavour Physics with an eye to Super-B

Leptonic decay constantsfK,fD, andfDswithCarrasco1, Dimopoulos2, Frezzotti3 et al. 2015Phys. Rev. D122141020View full textAdd to dashboardCite

High-precisionfBsand heavy quark effective theory from relativistic lattice QCD

Contact Info

Product

Resources

About

Leptonic decay constantsfK,fD, andfDswith
Carrasco
¹
,
Dimopoulos
²
,
Frezzotti
³

et al. 2015
Phys. Rev. D
122
14
102
0
View full text Add to dashboard Cite