Here we go. can I say? Yes, please go ahead when you're ready. Okay, great.
Yeah. So good morning everyone. I'm here today to present to you results from lacp
on multiple sites have been in production of the KC one 372. Yeah, so the KC one 372
or the X is I'm gonna call it during my talk is an exotic drone. It was first
observed some 20 years ago by the bell experiment. So, the bell did was to look
at the spectra of j Psy D pi. And as you can see here on this plot on derived from
the the case of the beholder, and what they saw in the vicinity of decided speak
as well decide to speak this nice topic that you may see here and Steinle to be at
a bit higher mass which they named x. So our agenda X was believed to be another
convention which harmonium stayed by
option has been since ruled out as the Wonder numbers of X has been determined to
be one plus plus. And this makes it inconsistent with like
with the convention ceremonial because there's no state expected close to the
mass of dx.
So till now, the nature of x is still a mystery and we have several possible
hypotheses or theories that are
trying to guess what its nature. So for instance, there's some papers saying that
it could be a compact multicore. Or for instance, 100 terminal that's Chairman in
core or abetted by a flavor by by flavor, light flavor corks or a hydrogen molecule
or of course, a combination of these days.
So under recent years, and the high multiplicity of
Number one collisions we have seen many phenomenon that we know from clerical
isms, such as some structures and I have done correlations. As you can see on this
plot on the left.
This typical structure such as the eBay site rage, which are absent in minimum
bias return from data or friends and their boards. It's an enhancement of traditional
model strange
hydrophones with increasing multiplicity.
So, this means that pigeon pigeon collisions provide us with another
playground where we can test and try to understand the nuclear effects of be
observing proton close collisions.
Now, the conventional charmagne has been long studied nuclear data and we know that
its production is affected by the nuclear medium. The modification is quantified by
the so called macro modification factor which is defined on the slide here.
And is pretty much defined as the as the production and production close collisions
normalized by the production and production freedom scaled by the atomic
number of new clothes.
As a bigger modification for ammonia at LSE is shown on the plot on the right,
where as a function of our ability,
we can see the modification for j psi in red and for Sagittarius in black. And so,
the first thing you might notice is that these teacher Moana have a different
separation pattern where the Chase is a preset for traffic at about a ratio is
consistent with the energetic rapidity. While for decider is that we see a similar
level of separation that's stronger than that for the chase. I have both
repetitiveness Moreover, the chase I can be described with models containing
Difference initial state ethics that would affect the CC bar as its production, but
these models fail to describe the sideways. So, if it was really an initial
state
it should it should be affected both both of these states should be affected the
same way So, Geron needs to be some effects of play that take place at later
stages of the collision. Moreover, looking at the bottom on our family so this is
shown in these two plots at the bottom where we have decided to as over
outsiders observe them on as over sold to us over a wellness there are a lot of
suppression and three years over monos
Yeah, so you can see it for the higher states do suppression is stronger for the
three years even more pronounced and this pattern can be described but final stage
ethics such as the commerce model,
So now we can take the knowledge of the metals that we use to probe commercial
Chairman now, such a site as in a nuclear metric and apply it to the x. And
hopefully by measuring its relative suppression, for instance, as a function
of multiplicity compared to sideways, which the case in the same mode, we may
help to learn something about excess nature. So then what we can expect if x is
a hydronic molecule, so then it means that it's
the x would be very weakly bound with a large radius of about transgender meters,
and not be very prone to dissociation. On the other hand, if x is a compacted
record,
that record we can we can expect it to be tightly bound and have a small radius and
then it would not dissociate so much.
Moreover, we also need to take into account where the states that we're
studying was period
produced. So, we have the prime states that are producing the interation vertex.
And these then may interact with a creative medium and for instance,
associates have bad interaction with commerce. On the other hand, we also have
the delight or non prime component where that originates from the hadrons. And
these can affect by the significant distance from, from their point of
creation. So then
they don't have stays will decay in vacuum and should not be affected by the
underlying
oops, so, so the analysis and results that I'm about to show you has been obtained
with eight of the ICP detector, which is a single arm spectrometer fully instrumented
for a trap entity, which has been designed for studies of heavy quarks. As such, ICP
has axon radix and tracking and indentification capability and can
reconstruct have 100 rounds down to zero PT
So, some notable systems that has been used in this analysis is the vertex
locator which is a circle detector surrounded interaction point and as the
name for such names such as provides within a day, nobody with a vertex.
They will also enables the separation of the prompt and on prem component and Roger
hora in this analysis service
allows us to get the activity proxy which was defined as the number of tracks
reconstructed in below. Then we have a set of tyrannical detectors downstream and
upstream from the magnet which was used to identify the pylons and finally the neons
were triggered on and reconstructed with eight of them in your system.
Now the goal of the analysis was to
calculate a cross section ratio of x oversight us and four
For both of these to come in is very constructive terminal spectra of chase AI,
and the Python of which example you can see here on this right. So we have a nice
tobik for the side us and a tiny home for the x.
And this picture, as you can see here, this is a circuit for for turbidity and
for transistors, about five G. Now, to separate the front and the non prime
component, what was done was to simultaneously fiddle around mass spectra,
as you can see here, on this example, the bottom for one of the multiplicity events,
and to see the appropriate time which is defined as the difference of there's a
component of the DK vertex of the state that we're looking at and the primary
vertex normalized that is a component of the momentum of the state and scaled by
its mass.
So after separating the promo known from gambling
We can compute a fraction of percent x and North Korean cite us, which is define us
as here as the number of the prim state over a number of all states. So, the
results as a function of multiplicity are visible on this plot on the right for x in
blue and for Sagittarius in black. And you may notice that for both sides, the
friction decreases and multiplicity. Now, this could be explained with combination
of effects first of which would be that the non from component has
increased with multiplicity. As with increased multiplicity, we get harder
events, which means that the probability of producing a BB bar pair is also
increased. And then this increase the bar production means more we have drones which
can produce more delay to exorcise exercises. The other effect would be the
perimeter reduction and decrease
With multiplicity and this could be explained as in
evidence with a higher multiplicity with high occupancy the states produced at the
interaction at the primary vertex have a higher probability of being associated
with a
with a by the underlying event while those that are produced fire right from the
vertex are remain unaffected.
So, now, you have all the components to compute the cross section ratio So, taking
into account some detector effects and there is results for different for the
cross section ratio you can see here as a function of multiple sets of for the
prompt in red and for the non from the delayed and black. So, let's first have a
look at a perm ratio so the ratio of principal
Produce x oversight as decreases with multiplicity. So this means that the
suppression of x is stronger compared to sideways
with increasing multiplicity,
on the other hand, a non current
ratio, so the trend that you see here is consistent with a flat distribution, which
would mean that the it's independent of the multiplicity, which is actually what
we would expect for the states that are produced far away from the interaction
point. So all in all, the behavior that we see is consistent with the idea of weakly
bound accidents more dissociated and suggest it's more tightly bound.
Now unfortunately, there's no finalized theoretical calculation as of today.
However, there's
there's of course
As much effort
in invested in trying to explain the observed behavior. So one of the one of
the publicly available preliminary results or results is our work in progress can be
found in lns talk from one of the GSI virtual from last December
where she tried to study what would be the scenario in commerce model if the X was a
Miko or a quirk. So,
if x is a molecule, then it should be dissociated with comoving Metro pretty
much immediately and as you can see on this screenshot of her slides are added at
about double the average multiplicity you do not see any x and estates. On the other
hand, if x is a track orc, so then the suppression is going to be more gradual
that multiplicity and you
You can see that the chant, quote, Abdullah describes the the ICB data much
better. However Also, before we draw too many conclusions, it's also good to
mention that while the calculations with numbers are based on number of charged
particles, and now ICB, we're using number of charged tracks. So we're using a proxy
that's uncorrected for detector effects. So
we can use it to describe it qualitatively. quantitatively. Yeah, no,
you have two minutes. Okay, great. Yeah. So well.
Yeah, so last thing from for me, so I would like to leave you with a little
teaser for an ongoing analysis of x and production data at a TV. So here you can
see the nice peaks that we have in Ferber trap entity and backwards rapidity. And as
you may see, this is the zoom of the chase.
And find spectra around excess miles. And then both receive a nice little peek above
the combinatorial break around. And this measurement in particular will add two
additional points to the event activity axis. So this will allow us to compare
the effects in different systems but in events with the same multiplicity and also
it will enable us enable us to study the relative suppression of x as a function of
rapidity.
And this brings me to my conclusion. So to sum it up. You've seen in recent years the
proton proton collisions provide us with new insight into nuclear ethics that we
usually measure and proton let's unlock collisions for the nucleus and nucleus and
cause collisions.
One of typical probes of these effects is the modification of production of
conventional thermonuclear. However, we can use the methods and the knowledge that
we have shown this measurement and apply it
To
exotic hydrogen such as is the x and hope to learn more about its character.
So, in my talk, I shown you results of measurement of relative suppression of X
overside to s as a function of multiplicity in proton proton collisions
at 70 v. And we've seen that the ratio of the prompt states decreases with
multiplicity, while the ratio of the non prime states seems to be independent on
multiplicity. So this
would mean that the X
is more stronger suppressed and the conventional side address which indicates
that it's more weakly bound.
Now, there's no final theoretical calculations However, there's some work in
progress on kumaris calculation, and so they these parametric equations dictate
This favorite scenario where x would be a pure hydronic. Michael, which is a
conclusion that also supports other measurements such as the abundance of x
decaying into side to s and gamma measured with ice.
So yeah, thank you for attention and hopefully see you later in my Zoom Room.
Great. Thanks so much, Jana for this for this description of such a beautiful
result that LED TV is produced.
We also really appreciate you being here because I know it's very early in the
morning regular. Yes. So now we have a minute or two for a couple of questions on
Yanis presentation. So if you have any questions, please use the raised hand
button in zoom and then we can call on you.
Hello, Alice. This is Elena. Yes.
A Jan is just
A comment a hello yeah. Now, thank you very much for showing the preliminary
results. It just mentioned that we go on on that work and that our conclusions for
the moment risk and change. So, should be accommodated for from our point of view.
E the data should be a compact object that cannot have the size of a molecular
estate, even if they are doing much more work with the Angelus posse D'Alessandro a
and Carlos I got on gentlemen, Johnny trying to introduce our support
Coalition's in the case of a molecular just to check if in that case, a molecular
approach could be possible, but our a resource for the moment say that no, is a
Ataturk. So thank you.
All right. Thank you.
That's good to hear. And of course, we look forward to that.
finalization of that result? Now, we have one other question from washing.
Yes. So, still mean probably this question to the Elena
I mean, since you say that your calculation removal calculation is forever
The Pew hydronic a molecule of the x,
how can you also get get some information how much of the ammonium components you
can you can you can have from for your calculation,
you
need to state right
is that in our calculation, which is extremely simple, we will take a cross
section that can be calculated based on the binding energy and the size of the of
the object. In that case, you will have a interaction, a cross section for all of
the Communist states that would depend
debating energy and geometrical cross section in the case of a boss at the truck
park or a molecular estate a for the predicts, you will have a positive
interaction the interaction that goes like the geometric data section in that case
they have a molecule that is much a too large. So, it would disappear at the mean
multiplicity which coincides with a minimum bias a BP
because of this, you cannot have this a experimental behavior. I don't know if I
answered your question or not.
Okay.
So now I would open it up to discussions on any of the four talks so we can have a
couple minutes for general questions and general discussions. Whether you
Have a question specifically for me now or Nestor or washing or Yana is totally fine.
Or if you have a more general question or discussion topics that you'd like all of
our speakers to address, please raise your hand and we'll take them in the order in
which they come.
Maybe have one for Nesta or miss. Sure good. Hello Nestor. This is Elena a in a
would you is the spoke about the different MBDA approaches. And you mentioned the
data use a different approaches which brought on lead
NTT DATA has been used in ebps A that you that you mentioned that it was use yeah
Mbps 16 as far as I remember the use the five TV CMOS digits on the also they use
the W sunsets so it's not really surprising that they are better than then
scitech to reproduce at with data because they have data lower and
it is the only set that uses energy data. And all in all, this is like 30 points.
Okay, thank you. Thank you because I was always curious and I ya know, I'm also
because I know that question had worked the trying to introduce other ppb data was
there there's the turn by ocean and the need to introduce the debate out so Han
Pokemon on the I think it was
Parking they introduced the no push okay in mathematics introduced dimensions on
the there is this reanalysis of the of the car D and one of the digests with the new
data that are much more differential. Yeah. So they are much more data points
included in these roadways in that I flashed.
Thank you
very much.
So are there any other questions that we could discuss today