Yes.
Okay, so, first of all, a big thank you for the organizers and the comenius to
manage to organize this conference in these unusual conditions even more unusual
now that zoom is not working. And yes, thanks for the opportunity to present
these recent work on LFO we can QC the addictions for a boost to action. So, as
you probably know, there was a big progress on the Kissimmee throne in the
recent years and nowadays, all a diverse on processes are available at any law
procedure. So these are was quite big enterprise and made possible by by by us
People in the key steps that went into these calculations on the one hand to the
automation of NLU calculations for dipoles on surplus one extra Jetta then of course,
the to loop QC the amplitude. So, for the required processes and the combination of
these two ingredients thanks to the structural metadata for the constellation
of inverted singularities. So, now, all these is combined and made publicly
available in the matrix program, which can compute as passed on level all processes
with four electrons or neutrinos in all combinations, attend and look UCD any
clues also to look into school lunch China's at any low capacity so, Here, you
see an example of these in analog UCD predictions where you clearly see from the
scale variation a dense that we have to see the uncertainties as more as a few
percent. So this is really, really means a big potential in terms of possible a
procedure on test EFT feats of surgeries with diverse backgrounds. And what you
also see from the comparison with the data in the in the racial cloud, the dnn law is
not enough, especially when you move back to higher duty here is giving that to MPT
that is plotted. Well also the electroweak correction so we try to add that here in a
greener start to be more and more. Well, also on the electroweak front, that was an
Big progress and all the boson production and decay processes are now known as next
leading order. So, typically, the electroweak effects are late, they're
small, but they can become larger distributions, especially in the higher
energy days. When you go far above the electroweak scale, there are a big stack
of logs from the exchange of certain w bosons between external legs. And in the
boson processes, these logs get the biggest coefficients. Then at IPT, you
have also possible enhancements from gamma, gamma and gamma both channels,
especially from these kinds of topology here where you have an exchange of W
bosons in the tea channel. And thanks to the Luxor a PDF nowadays These photon use
terms are pretty well under control. And finally, there are possible after effects
from the well known fragmentation of photons typically in environment mass
distribution. So, this talk is about the combination of an integral QC and an
analog electroweak. And these are what was achieved by taking advantage of the
automation of an electroweak
analyzer week calculations with open loops, in particular the recently released
open loops to action in combination with the unique Monte Carlo program and these
fula no GCD electroweak automation is fully integrated in the matrix fame or,
indeed gives a gopis no to these analog CD players. And then it was illegal
recalculations with all the bows and processes that that you see in these
tables with four three or two charged Neptune signatures. So, and let me move to
the physics part of of this paper, what we did is a comparative studies of adaptive w
pair and W set production focusing on the behavior of the vector bosons in the high
PT regions. So, the high p region is the most interesting when you combine QC and
electroweak corrections because both can get quite larger and they interplay can be
quite
so, here above you see the main players in this business some leading order that you
have to schoolbag, channeling QC D, but then also the gamma gamma channel opens a
door electroweak sector, the QC D and electroweak corrections to these channels
are in these red and blue factors. And in addition, there are also an OECD, the
looping use the golden rule, contributions that we treat separately. So, when we look
at the interplay between a QC and a little weaker a good way of inspecting that is to
compare two possible prescriptions for data combination, the most naive one is
just an additive combination where nothing special happens. But then Alternatively,
you can also argue that factorizing the two corrections that may be more
appropriate in certain cases, and the difference between a district restriction
sir consist of finance Stop a factor, where you have the two correction factors
multiplied. So, this difference is an effect of the alpha alpha s. And when both
corrections get large at high p t, it can be larger, and usually it should be
interpreted as a larger source of uncertainties. But in some cases, there
are theoretical arguments that support the factorize prescription So, the difference
is not an uncertainty. And let me note in passing that actually our best or prefer
the factorize combination is this formula at the bottom of the of the slide, where
we actually excluded from the factorization of the photon induce the
channels because in that case, the factorization is clearly not justified.
So, and now, before we move to the plots, let's view let me give you the clue to
interpret the beat You have electroweak and UCB corrections, a tie a PT and the
key observation and is that everything depends on who the call is against the
leading factor goes on when these leading bows on and gets very high p. So, he has
two possible configurations that receive a completely different corrections, you have
the case where the recoil is taken by a very hot jet. So, basically you are
dealing dealing with vector boson plus jet production plus a softer, so, bleeding to
the bosom of new this case, where the recall is mostly taken by the second
vector boson. So, you you really have hard that the boson production plus and this
bit of soft QC activity and in this second case, actually the corrections are
dominated by an pseudocode blocks and in the electroweak sector and there are
theoretical arguments that support the factorization. So, in this case, we don't
have a larger of that alpha alpha is uncertainties. And and here, you see how
the corrections look like for ww production. So, the observable here is the
TT of this superseding vector goes on. So, when it gets hot, but then also the
leading vector both of these either and you have these hard dipoles on
configurations. So, in the middle initial plot, you see in red and blue and yellow
and any low acuity corrections, which have a practice a moderator and you see that
attend a low we get to these few percent level of scale uncertainties you see in
light orange should the electroweak corrections, which get larger because of
pseudocode for locks and they can be as large as 50% or so, in the TD energy
regime. And as I said in these case the best combination is the factorized one.
So, we incorporate the leading alpha alpha bias correction. So, and there are very
little residual file size scale uncertainties, the dominant uncertainties
are from two loop or pseudo blocks that are not included here and start planning
booked and Lola at the level of 500. tv over
five minutes.
Yes.
So, and here we see the same plot for the three possible they both on processes and
the bottom line is that there are a little numerical differences But the quality of
this picture is is the same. So, let me move on to the other scenario that I call
the hardware vj configuration. So, these is the situation where the recoil of the
leading balls on b1 is taken by a by a QC director and the softer balls on is very
softer. So, what happens here is that if you leave these softer balls on
unconstraint so you integrate over his face base, then you basically generate a
larger a double locks of electroweak type that multiply the cross section for a
heart boson plus jet production process and these amounts to a very large few city
corrections that can be as larger as a factor As we will see and something
similar happened on the site on the electroweak corrections, there is these
similar channels with a vector boson plus a half jet, where a softer W is radiated
from an initial state gamma, these guys can also become a very large. So we deal
with completely different have processes that we have no fluctuation of the PCB and
electroweak corrections and and now we look at the behavior of the corrections
for one upset bubble dot he's dominated by the vitriol, mainly the leading rhetoric
polls on PT. So in the middle frame again, you see a huge a QC corrections are beyond
the factor of 10 in the TV Effie john. Fortunately, These these huge effects do
not continue the beyond any law. So there is no need to mention immediate for such
logs and the end in local elections. So look at pretty stable. This is a was not
the case for the electroweak direction some. So you don't you cannot resolve them
in the media closet but you see in the lower floor the different ways of
combining the electroweak reflections in pink, green and the dotted line, they give
completely different answers. This is because you have to be connected pseudo
flocks that cancel against very big positive photon involves initiated
contributions that I showed in the previous slide. And depending on how you
combine things, so one of the other winner cancel against each other and the
difference is a very big theoretical uncertainty that basically spoils the high
any low procedure on a tight possible solution sir, on the essentially the
problem can be solved that by adding the dominant missing corrections above that
alpha alpha and these are the electroweak corrections to hard v jet configurations
plus plus one or softer vector models. There is a technique emerging techniques
to to do these NT it was actually recently tested for WP production in a paper that
was posted just just yesterday. But these is not available for anyone to look at.
So, what we did in our paper is actually to veto these problematic retread
configurations using what we may call a mighty agent veto. So, basically We allow
for an amount of jet translates the energy a also at most 20% of the electronic
transfer energy in the in the event and you see on the right to the effect of the
veto. So, basically you see that this is the ratio of the potential to proposals
and you have a big plateau and an investment that when the second goes on
becomes softer and smaller at one two and this is completely cut away but these
these videos in
the half the day goes on sir plus software to see the activity or close to to the
right side of visa is blocked up. And the end here you see the a the corrections are
they out they look like I don't need to do this These are so these again is the
problematic observables the leading bows on PT, but now applying such an HSP and
basically what you're saying here is the well behaved the shape of the GCD and the
electroweak corrections and the combinations that we had at the beginning
in upset levels dominated by heart and eyeballs on topologies. And I can already
conclude conclude that so as I said that and now, the end Look, your CD collections
combined with Angular weaker are available for
so my time is over.
And available for all adaboost processes with option net, the neutrino decays, the
code should be published soon and that's it. stress that high PT you can have large
church UCD and electrical weak effects and a non trivial interplay. And the key to
understand these is this categorization into half the balls on top of boson plus
jet categories. In one case, the big corrections are well under control with
good precision up to relatively high a TT. In the other case, there are large alpha
face uncertainty. And these requires either a veto or a multitrack metric
approach. That's all. Thanks.
All right. Thank you, Stefan. Oh, so we have time for a few questions. We don't
have this raise hands feature in video. So I guess if you have a question you should
just unmute, introduce yourself and ask it
I would actually have a question about this Maya Jedi two that you applied, how
does that agree with what's actually being done in the experimental analysis of this
process?
So, I should say that the entire study that we have presented here is a not. So,
if theory then For what concerns the choice of the of the cat's in the
observables. And what that can say. So, clearly, we have defined the distance with
energies in a way that can be implemented in experimental analysis, but it should
just be considered as as one out of many opportunities. So many possibilities. So,
the message here is that you have you need something that super assists, these have
to be trapped configurations and allows the heart that I wasn't configurations to
gather with enough soft TCP activity in order not to generate a CD and say
uncertainties, and let me measure that one important as definitive would be to
formulate as such such a veto directly in terms of the of the movement of the
dipoles and some data decay products. So without imposing any restriction on the,
on the jet activity, but just that, requiring that the second factor is having
enough, okay, but it's not, you know, a precise recommendation for the experiment.
It's more like general qualitative methods of how to, to deal with these topologies
All right, but if the experimentalists would want to use you probably Grant once
it's public, right, they would have to do something that avoids to stainless Legion.
Right?
So the program, I mean, works and produces results, and wasn't inclusive case. And so
these are the plots I showed here, right? And then and actually, if you stay on
there, say 300 gb or so, you see that you have slightly bigger uncertainties as
compared to 10 and rocky city, but still, we are in good shape. Yeah. So it's really
a problem now, you know, for the future when there will be high statistics in the
TV, Ranger. And yes, there, what one has to implement a solution? I think the, you
know, the clean solution is this management approaches that I mentioned
that should be extended to any law but still experiments that is can implement
the data the fieldwork tasks. So, it is not I mean the the matrix code is fully
flexible you can implement any observable and any
things, any other questions
any other question on slide 13 before let me say that indeed the dick study
experiments are seriously considering to make the analysis we discuss my name is
machete chakra.
So, on slide 13 Stefano, I would like to and so, why there is a different behavior
between sunset dr adapt to that is that concerning these
corrections, these differences between the two prescription
right. So,
what happens here is that, so different things happen so, on the wire aside, you
see that the QC corrections still grow. And in particular, in the case of W that
that gets as large as a factor of two in the day. So actually, we still have a bit
too much of these Harper legit contributions around that anyone should
render the veto slightly more stringent. So, we did not try to optimize it at all,
but one should try to do that, in these both reduce these differences.
And
so that's the main origin of the of the significant difference between between the
different combinations. And then what happens is also that the electroweak
corrections behave a little differently,
but intuitively similar, but potica deliberated differently.
And this is a very subtle interplay, play and be Okay, don't go into the details
here. This is something that is well understood the bat read there, except the
last
feature of the pseudocode for electrical weak locks.
Okay.
All right. Thank you. So let's thank Stefano again. Even though we can't
articulate