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SUMMARY:CHARMONIA DECAY CONSTANTS FROM LATTICE QCD AND QCD SUM RULES
DTSTART;VALUE=DATE-TIME:20140704T135000Z
DTEND;VALUE=DATE-TIME:20140704T141000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-1572@indico.ific.uv.es
DESCRIPTION:Speakers: Blazenka Melic (Rudjer Boškovic Institute\, Theoret
ical Physics Division P.O.Box 180\, HR-10002 Zagreb\, Croatia)\nWe compute
the decay constants of the lowest ccbar-states with quantum numbers J(PC)
=0(-+) [eta_c]\, 1(--) [J/psi]\, and 1(+-) [hc] by using lattice QCD and Q
CD sum rules. We consider the coupling of J/psi to both the vector and ten
sor currents. Lattice QCD results are obtained from the unquenched (Nf=2)
simulations using twisted mass QCD at four lattice spacings\, allowing us
to take the continuum limit. On the QCD sum rule side we use the moment su
m rules. \nThe results are then used to discuss the rate of eta_c --> gamm
a gamma decay\, and to comment on the factorization in B --> X K decays\,
with X being either eta_c or J/psi.\n\nhttps://indico.ific.uv.es/event/202
5/contributions/1572/
LOCATION: Sala 2
URL:https://indico.ific.uv.es/event/2025/contributions/1572/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress of lattice calculation of light-by-light contribution to
muon g-2
DTSTART;VALUE=DATE-TIME:20140705T103000Z
DTEND;VALUE=DATE-TIME:20140705T105000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-1363@indico.ific.uv.es
DESCRIPTION:Speakers: Eigo Shintani (Mainz Univ.)\nI would like to present
current progress of lattice calculation of muon g-2 for light-by-light co
ntribution. We forcus on the lattice calculation of non-perturbative contr
ibution to neutral pion to two-photon decay transition form factor in ligh
t-by-light diagram. In this talk I will also compare with the direct compu
tation in QED+QCD lattice simulation.\n\nhttps://indico.ific.uv.es/event/2
025/contributions/1363/
LOCATION: Sala 6+7
URL:https://indico.ific.uv.es/event/2025/contributions/1363/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Volume (in-)dependence for SU(N) gauge theories with twisted bound
ary conditions
DTSTART;VALUE=DATE-TIME:20140704T143000Z
DTEND;VALUE=DATE-TIME:20140704T145000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-1344@indico.ific.uv.es
DESCRIPTION:Speakers: Mateusz Koren (Instituto de Física Teórica UAM/CSI
C)\nWe analyze 2+1 dimensional Yang-Mills theory regularized on a lattice.
We employ twisted boundary conditions in the spatial directions and show\
, using both perturbation theory and non-perturbative simulations\, that t
he physical quantities depend only on the combination NL/b and the magneti
c flux given by the twist (N is the number of colors\, L the length of the
spatial torus and b is the inverse 't Hooft coupling). In this talk we ex
tend the previous analyses to the glueball sector. Finally\, extension to
3+1 dimensions and theories with fermions is discussed.\n\nhttps://indico.
ific.uv.es/event/2025/contributions/1344/
LOCATION: Sala 2
URL:https://indico.ific.uv.es/event/2025/contributions/1344/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutral meson mixing on the lattice
DTSTART;VALUE=DATE-TIME:20140704T130000Z
DTEND;VALUE=DATE-TIME:20140704T133000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-1301@indico.ific.uv.es
DESCRIPTION:Speakers: Nuria Carrasco Vela (INFN-Rome3)\nAccurate measureme
nts of K\, D and B meson mixing amplitudes provide stringent constraints i
n the Unitary Triangle analysis\, as well as useful bounds on New Physics
scales. Lattice QCD provides a non perturbative tool to compute the hadron
ic matrix elements entering in the effective weak Hamiltonian\, with error
s at a few percent level and systematic uncertainties under control. In th
is talk\, I will review the recent lattice results for these hadronic matr
ix elements.\n\nhttps://indico.ific.uv.es/event/2025/contributions/1301/
LOCATION: Sala 2
URL:https://indico.ific.uv.es/event/2025/contributions/1301/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inclusion of isospin breaking effects in lattice simulations
DTSTART;VALUE=DATE-TIME:20140705T093000Z
DTEND;VALUE=DATE-TIME:20140705T100000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-1296@indico.ific.uv.es
DESCRIPTION:Speakers: Antonin Portelli (University of Southampton)\nIsospi
n symmetry is explicitly broken in the Standard Model by the non-zero diff
erences of mass and electric charge between the up and down quarks. Both o
f these corrections are expected to have a comparable size of the order of
one percent relatively to hadronic energies. Although these contributions
are small\, they play a crucial role in hadronic and nuclear physics. We
explain how to properly define QCD and QED on a finite and discrete space-
time so that isospin corrections to hadronic observables can be computed a
b-initio. We then consider the different approaches to compute lattice cor
relation functions of QCD and QED observables. Finally we summarise the ac
tual lattice computations which include isospin breaking effects.\n\nhttps
://indico.ific.uv.es/event/2025/contributions/1296/
LOCATION: Sala 6+7
URL:https://indico.ific.uv.es/event/2025/contributions/1296/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Precision lattice heavy flavour results from Nf=2+1+1 simulations
DTSTART;VALUE=DATE-TIME:20140704T133000Z
DTEND;VALUE=DATE-TIME:20140704T135000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-1169@indico.ific.uv.es
DESCRIPTION:Speakers: Petros Dimopoulos (Centro Fermi - Museo Storico dell
a Fisica e Centro Studi e Ricerche "Enrico Fermi" - Dipartimento di Fisica
\, Univ. di Roma "Tor Vergata")\nWe present precision lattice calculations
for the decay constants of the D and B sector as well as determinations o
f the charm and b quark mass values. Heavy flavour lattice computations ar
e indispensable \nfor SM accuracy tests and may serve as discovery tools f
or new physics. We use Nf=2+1+1 dynamical quark gauge configurations gener
ated by European Twisted Mass Collaboration. We use data at three values o
f the lattice spacing with pion masses as low as 210 MeV. Strange and char
m quark masses are close to their physical values.\n\nhttps://indico.ific.
uv.es/event/2025/contributions/1169/
LOCATION: Sala 2
URL:https://indico.ific.uv.es/event/2025/contributions/1169/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative results for large-N gauge theories
DTSTART;VALUE=DATE-TIME:20140704T141000Z
DTEND;VALUE=DATE-TIME:20140704T143000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-1156@indico.ific.uv.es
DESCRIPTION:Speakers: Biagio Lucini (University of Swansea)\nIt has been k
nown for a long time that large-N methods can\ngive invaluable results int
o non-perturbative phenomena such as\nconfinement. Lattice techniques can
be used to compute quantities at\nlarge N. In this talk\, I will review so
me recent large-N lattice\nresults and discuss their implications for our
understanding of\nnon-perturbative QCD.\n\nhttps://indico.ific.uv.es/event
/2025/contributions/1156/
LOCATION: Sala 2
URL:https://indico.ific.uv.es/event/2025/contributions/1156/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effective Field Theory For QCD-like Theory at TeV scale
DTSTART;VALUE=DATE-TIME:20140704T145000Z
DTEND;VALUE=DATE-TIME:20140704T151000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-1131@indico.ific.uv.es
DESCRIPTION:Speakers: Jie Lu (IFIC\, University of Valencia)\nWe study the
Effective Field Theory of three QCD-like theories: which can be classifie
d by having quarks in a complex\, real or pseudo-real representation of ga
uge group. We wrote their effective field theories in a very similar way s
o that the calculations can be done using techniques from chiral perturbat
ion theory. \nWe calculated the vacuum-expectation-value\, the mass and th
e decay constant of pseudo-Goldstone Bosons up to next-to-next-to leading
order (NNLO) in the first paper. \nThe various channels of general meson-
meson scattering of the three cases were systematically studied and calcul
ated up to NNLO in the second paper. \nIn the third paper\, we calculated
the vector\, axial-vector\, scalar\, pseudo-scalar two-point functions and
pseudo-scalar decay constant up NNLO order. \nWe also obtained the analyt
ic S parameter for those different QCD-like theories at the TeV scale. Our
results can be used for chiral extrapolation in lattice calculation on st
rong dynamical theory. \nIt might be also useful for research on the theor
y about finite baryon density.\n\nhttps://indico.ific.uv.es/event/2025/con
tributions/1131/
LOCATION: Sala 2
URL:https://indico.ific.uv.es/event/2025/contributions/1131/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The strange and charm quark contributions to the anomalous magneti
c moment of the muon from lattice QCD
DTSTART;VALUE=DATE-TIME:20140705T105000Z
DTEND;VALUE=DATE-TIME:20140705T111000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-1007@indico.ific.uv.es
DESCRIPTION:Speakers: Jonna Koponen (University of Glasgow)\nWe describe a
new technique (presented in arXiv:1403.1778) to determine the contributio
n to the anomalous magnetic moment of the muon coming from the hadronic va
cuum polarization using lattice QCD. Our method uses Padé approximants to
reconstruct the Adler function from its derivatives at q^2=0. These are o
btained simply and accurately from time-moments of the vector current-curr
ent correlator at zero spatial momentum. We test the method using strange
quark correlators calculated on MILC Collaboration's n_f = 2+1+1 HISQ ense
mbles at multiple values of the lattice spacing\, multiple volumes and mul
tiple light sea quark masses (including physical pion mass configurations)
. We find the (connected) contribution to the anomalous moment from the st
range quark vacuum polarization to be a^s_μ=53.41(59)×10^(−10)\, and f
rom charm to be a^c_μ=14.42(39)×10^(−10) - 1% accuracy is achieved for
the strange quark contribution. The extension of our method to the light
quark contribution and to that from the quark-line disconnected diagram is
straightforward.\n\nhttps://indico.ific.uv.es/event/2025/contributions/10
07/
LOCATION: Sala 6+7
URL:https://indico.ific.uv.es/event/2025/contributions/1007/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD studies of the leading order hadronic contribution to
the muon g-2
DTSTART;VALUE=DATE-TIME:20140705T100000Z
DTEND;VALUE=DATE-TIME:20140705T103000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-984@indico.ific.uv.es
DESCRIPTION:Speakers: Gregorio Herdoiza (KPH Mainz & IFT Madrid)\nThe anom
alous magnetic moment of the muon\, g-2\, is one of the most\npromising ob
servables to identify the signs of physics beyond the\nStandard Model. QCD
contributions are currently responsible for the\nlargest fraction of the
overall theoretical uncertainty in the\ndetermination of the muon g-2\, an
d in the running of the QED coupling\nconstant. Studies of the vacuum pola
risation function and of the Adler\nfunction\, currently being carried out
by the Mainz lattice group\, will\nbe presented. The various systematic e
ffects present in the lattice\nQCD determinations of the muon g-2 and of t
he running of the QED\ncoupling will be discussed.\n\nhttps://indico.ific.
uv.es/event/2025/contributions/984/
LOCATION: Sala 6+7
URL:https://indico.ific.uv.es/event/2025/contributions/984/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Observables in Higgsed Theories
DTSTART;VALUE=DATE-TIME:20140704T151000Z
DTEND;VALUE=DATE-TIME:20140704T153000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-946@indico.ific.uv.es
DESCRIPTION:Speakers: Axel Maas (University of Jena)\nThe Higgs sector of
the standard model\, the Higgs and the W/Z bosons\, is a quite peculiar th
eory. Because of the Higgs effect\, for some regions of the quantum phase
diagram of the theory the observable particles\, i.e. gauge-invariant boun
d states\, have the same mass as the elementary particles. This is what ma
kes perturbation theory in the electroweak sector possible. Under which co
nditions this holds true is not only important for understanding the Higgs
sector itself\, but may have severe implications for observable states in
generic higgsed theories. Herein\, the underlying mechanisms are studied
with the standard-model Yang-Mills-Higgs sector as an example\, using latt
ice gauge theory. It is shown under which conditions a perturbative descri
ption can be expected to give an accurate representation of the observable
states. Especially\, it is found that only in a rather narrow range of Hi
ggs masses this appears possible\, and it is briefly digressed on the conn
ection to the experimental results. In addition\, some remarks will be giv
en on the situation in more general theories\, which are relevant to the c
onstruction of extensions of the standard model.\n\nhttps://indico.ific.uv
.es/event/2025/contributions/946/
LOCATION: Sala 2
URL:https://indico.ific.uv.es/event/2025/contributions/946/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fits and Related Systematics for the Hadronic Vacuum Polarization
on the Lattice
DTSTART;VALUE=DATE-TIME:20140705T111000Z
DTEND;VALUE=DATE-TIME:20140705T113000Z
DTSTAMP;VALUE=DATE-TIME:20220125T074858Z
UID:indico-contribution-127-832@indico.ific.uv.es
DESCRIPTION:Speakers: Santiago Peris (U. Autonoma de Barcelona\, Spain)\n(
See Attached file.)\n\nIn order to test the systematic error coming from t
he extrapolation at low $Q^2$ carried out in present lattice determination
s of the hadronic vacuum polarization contribution to the muon anomalous m
agnetic moment\, we employ a physically motivated model for the isospin-on
e non-strange vacuum polarization function $\\Pi(Q^2)$ [1]. The model is b
ased on the OPAL experimental vector-channel spectral function for energie
s below the $\\tau$ mass and a successful parametrization\, including pert
urbation theory and a model for quark-hadron duality violations\, for high
er energies. Using the same covariance matrix and $Q^2$ values as in a rec
ent lattice simulation\, we then generate fake data for $\\Pi(Q^2)$. The f
ake data is then used to extrapolate to low $Q^2$ and evaluate the hadroni
c vacuum polarization contribution to the muon anomalous magnetic moment\,
after which the result is compared to the exact model value. From this co
mparison we unravel a systematic error much larger than the few-percent to
tal error sometimes claimed for such extractions in the literature. We fin
d that errors deduced from fits using a Vector Meson Dominance ansatz are
misleading\, typically turning out to be much smaller than the actual disc
repancy between the fit and exact model results. The use of a sequence of
multipoint Pade approximants appears to provide a safer fitting strategy [
2]. Alternatively\, the use of one-point Pades based on the coefficients o
f the Taylor expansion of $\\Pi(Q^2)$ at $Q^2=0$ could also prove effectiv
e\, as recently emphasized in Ref. [3]\, but only if these coefficients ar
e accurately known\, not only for the $s\,c$ quarks but also for $u$ and $
d$.\n\n\n\nBIBLIOGRAPHY\n\n[1] M.~Golterman\, K.~Maltman and S.~Peris\,\n
``Tests of hadronic vacuum polarization fits for the muon anomalous magn
etic moment\,''\n Phys. Rev. D88\, 114508 (2013)\n [arXiv:1309.2153 [he
p-lat]].\n \n\n[2] C.~Aubin\, T.~Blum\, M.~Golterman and S.~Peris\,\n `
`Model-independent parametrization of the hadronic vacuum polarization and
g-2 for the muon on the lattice\,''\n Phys. Rev. D86\, 054509 (2012)\n
[arXiv:1205.3695 [hep-lat]].\n\n\n[3] B.~Chakraborty\, C.~T.~H.~Davies\,
G.~C.~Donald\, R.~J.~Dowdall\, J.~Koponen\, G.~P.~Lepage and T.~Teubner\,\
n ``The strange and charm quark contributions to the anomalous magnetic m
oment of the muon\,''\n arXiv:1403.1778 [hep-lat].\n\nhttps://indico.ific
.uv.es/event/2025/contributions/832/
LOCATION: Sala 6+7
URL:https://indico.ific.uv.es/event/2025/contributions/832/
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