Publications (5)0 Total impact
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ABSTRACT: The arrow of time is a familiar concept, entropy increases, landscapes are
eroded away by the elements, and we inevitably grow older. These irreversible
macroscopic effects taint our intuition of time, however it is well known that
the quantum arrow of time is different from this entropic behaviour. The laws
of quantum physics can be studied under the mathematical T operation that
inverts the direction of time. Strong and electromagnetic forces are known to
be invariant under temporal inversion, however the weak force is not. The BaBar
experiment recently exploited the quantum correlated production of B0 mesons to
show that T is a broken symmetry. Here we show that it is possible to perform a
wide range of tests of quark flavor changing processes, described by the weak
interaction, under the T symmetry in order to validate the Standard Model of
particle physics.
02/2013;
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Gianluca Inguglia
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ABSTRACT: The SuperB experiment at the Cabibbo Laboratory will provide new
possibilities to study the physics of charm. The potential physics reach of the
experiment when performing studies of rare decays, mixing and CP violation in
charm decays is presented here and the implications of such measurements for
new physics scenarios is discussed.
09/2012;
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Gianluca Inguglia
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ABSTRACT: A model which describes the time-dependent CP formalism in $D^0$ decays has
recently been proposed. There it has been highlighted a possible measurement of
the angle $\beta_c$, in the charm unitarity triangle, using the decays $D^0\to
K^+ K^-$ and $D^0\to \pi^+ \pi^-$, and a measurement of the mixing phase
$\phi_{MIX}$. The same method can be used to measure the value of the parameter
$x$, one of the two parameters defining charm mixing. We numerically evaluate
the impact of a time-dependent analysis in terms of the possible outcomes from
present and future experiments. We consider the scenarios of correlated $D^0$
mesons production at the center of mass energy of the $\Psi(3770)$ at Super$B$,
uncorrelated production at the center of mass energy of the $\Upsilon(4S)$ at
Super$B$ and Belle II, and LHCb. Recently a hint of direct CP violation in
charm decays was reported by the LHCb collaboration, we estimate the rate of
time-dependent asymmetry that could be achieved using their available data, and
we generalise the result for the full LHCb program. We conclude that LHCb is
already able to perform a first measurement of $\beta_{c,eff}$, and slightly
improve the present constraints on the parameters $x$ and $\phi_{MIX}$. A more
precise determination of $\beta_{c,eff}$, $\phi_{MIX}$ and $x$ will require a
larger data sample, and most probably the cleaner environment of the new high
luminosities $B$-factories (both Super$B$ and Belle II) will be needed. We show
that Super$B$ will be able to measure $\beta_{c,eff}$ and $\phi_{MIX}$ with a
precision of $1.4^o$ and improve the precision on $x$ by a factor of two.
04/2012;
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Gianluca Inguglia
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ABSTRACT: We propose for the first time a method to perform analysis of time-dependent
CP asymmetries in charm by using both, correlated and un-correlated $D^0$
mesons. Here we consider the decay channels $D^0\to K^+ K^-$ and $D^0\to \pi^+
\pi^-$. The channel $D^0\to K^+ K^-$ will be used to measure the mixing phase,
and the difference between the measured phase $D^0\to K^+ K^-$ and $D^0\to
\pi^+ \pi^-$ will open the door to the first measurement of $\beta_c$, one of
the angle of the charm unitarity triangle. Since in the standard model CP
asymmetries in charm are expected to be small, any observation of large time
dependent asymmetries or mismatch between predicted and observed value for $
\beta_c$ could signify new physics. We perform and show results of numerical
analysis made considering Super$B$ running at charm threshold, Super$B$ running
at $\Upsilon(4S)$ and LHCb and find that Super$B$ and LHCb will be able to
measure $\beta_{c,eff}$ with a precision of $1.3^\circ$ and $1.4^\circ$
respectively. The same analysis shows that $\phi_{MIX}$ could be measured at
Super$B$ with a precision of $1.3^\circ$.
09/2011;
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ABSTRACT: The measurement of time-dependent CP asymmetries in charm decays can provide
a unique insight into the flavor changing structure of the Standard Model. We
examine a number of different CP eigenstate decays of D mesons and describe a
method that can be used to measure time-dependent CP asymmetries at existing
and future experiments, with a preliminary assessment, based on statistical
considerations, of their various capabilities. Any asymmetry observed in
time-dependent analysis of neutral D mesons could signify new physics. We
discuss the measurements required to perform direct and indirect tests of the
charm unitarity triangle and the relationship between this and the B_d
unitarity triangle.
We also highlight that current experimental bounds on DeltaGamma(B_d)
translate into a significant systematic uncertainty on the measurement of beta
from b to c c-bar s decays.
06/2011;
