For on physics perspectives for Alice and run for
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Yes, we can hear you. Well,
okay, perfect. Just a moment. No problem. Can you see the slides?
Yes. Okay. Thank you very much. Thank you very much. And good afternoon, everybody.
It's a pleasure for me to be told on behalf of the collaboration on the physics
perfect perspectives for IBC. So, the first say the primary physics programmer
for the release experimenter is the study of the properties of the colada confined
medium called corpulent plasma, which is created the neutral atavistic API on
collisions such as C which presents a very high initial energy density, and after a
pre equilibrium phaser expands either dynamically like hundred percent A liquid
before other than icing in almost thermography do. So, one of the key
observables for these studies are the flip of particles, since a flavors are created
in short timescales compared to the formation time, and then they experience
the food system evolution and we can use them as probes of the plasma. So, the
Alice collaboration is preparing a wider upgrade programs with the serum three and
four, with the aim of increasing the collected lead luminosity by more than one
order of magnitude.
And for this, the upgrades of the LDC needed for this LED luminosity, we will
already be completing the long shutdown to suffer Aleksey factory. The main physics
motivations for this upgrade, so include the study of the trauma and introduction
and under detection into quantum plasma, the measurement of Konya down to PT zero
in order to study that melting and regeneration in the in the courtroom
plasma thermal radiation and the possible current symmetry separation at the phase
transition and the precise measurements of lighter hyper nuclei and the searches for
more exotic nuclei such as chump icon. So, the main requirements for this physics
program are the increasing increase the result writer to get with a reduction of
the data size for the storage, the improvement of the talking and the texting
capabilities are low transfer mentum and at the same time the preservation of
particle identification capabilities of the experiment. So the current upgrades
that we are
focusing on to include the the substitution of the readout chambers for
the time protection chamba in order to cope with the higher event rate expected
The replacement of the inner silicon tracker of Elissa Dena tracking system
with a new detector based on seven pixel layers of mono mono etica active pixel
sensors, which will also be used for a new forward tracker is empty. That would be
used to match the tracks measured in the forward muon spectrometer with the central
barrier of Elisa and finally had the introduction of new detector forward
detector for the trigger called the fast interaction trigger for which we have two
pulses. If you are interested, I invite you to look at that. Together with these
upgrades, we will also have to upgrade the readout electronics or several detectors
to cope with the with the iron production right expected. If you missed the talk by
kotra, I suggest you to look at the slides that were uploaded yesterday. Took At the
same time, we are preparing new upgrades for the LSC ram four, which includes the
introduction of our forward calorimeter called photon and the further upgrade of
the inner tracking system based on the replacement of the three innermost layers.
So, I will start with the discussion of the focal calorimeter which will include
an electro magnetic high granularity silicon tungsten sampling Corona meter for
the measurement of direct protons and the zero mass also, and another ronica
sampling kilometer for photon isolations and jets. So, the main goal for this
detector will be to set constraints on the nuclear PDFs at smaller transfer mentum.
And in particular to do on PDFs.
The grown PDFs are, let's say not very well constrained also for the proton in
the low X ray drawn below 10 to the minus four.
And in particular,
the measurement from measurements from deep in elastic scattering indicates that
the ground density increases rapidly at low x and the digital output and BHK and
equation so, predictor, I've had the growth at lower x. So we can ask ourself,
if we should expect an infinite growth or a mechanism to tame the blue one subtle
axes such as doing fusion or doing subtraction.
In fact,
the classical way of studying PDFs, the Gnostic scattering experiments, which
however, are not sensitive to the dual PDFs are at the leading order, while the
measurement of isolated photons are thorough there, it is sensitive about the
leaky gut. And in particular, it is a very large contribution from Compton
scatterings So in this plot, you can see basically, the region that will be covered
in the Q and x by different experiments, including Alexey but not not only at also
electron Iam Collider. So, recap experiments and then and then the next one
so abcb in particular, and this new detector for call that as you can see we'd
have the lowest X ray feature of the other experiments. In slide number eight, you
can see the expected performance of for this isolated photon measurement. And in
particular, you can see the expected performance for the nuclear modification
factor which is a key observable in API on collisions. And it's defined as the ratio
between the piti differential it's measured in ATM conditions in this case p
delta Those are measured in equaliser scaled by the average number of nuclear,
nuclear and binary drops. So the expected precision for this measurement will be
about 20% above 60 v over c. And if you look at it compared to the current
parameterization of the blue and nonnuclear PDFs from EP PPS 16. You will
see you can see and appreciate the significant improvement to the tool set to
constrain those nuclear PDFs. This can be seen even better in this plot, where you
can see basically, the gray region which represents the current knowledge of the
nuclear PDFs from the opinion are six scatterings which are basically
unconstrained for 10 to the minus two of the exit. Even if we currently have some
constraints, which are provided by hf measurements are followed the PDK by
Edison receiving However, if you will compare this fence with the one expected
for electron Iam Collider in green and the one for Can you you can appreciate how
difficult would be crucial to set constraints on these nuclear PDFs at very
low X up to I would say 10 to the minus 510 to the minus six.
I will now move to the second
experiment for the LSU Drum Corps, which will be the replacement of the three in
three Nirmal slayers of the IPS and for which are very new detector technology
will be used in particular had this technology and will will allow us to have
three to the cylindrical pixel layer So, based on this ultra thin Weber's wafer
size the covert sensor
for which you can ever let's see on
a feeling good Looking at the picture in the typewriter, which basically will allow
us to reduce drastically the material budget, in particular getting rid of
external connections or cooling. And you can see quantitatively in this table, how
the material budget will be reduced. And if we compared to the IQs 190s to the
percentage of radiation length per layer, we'd go from one point 14% to zero 38 in
the first upgrade of the APS up to zero down to zero dot 05 percent for the ITC.
And, but this will not be the only key feature of this detector. We will also go
closer to the interaction point down to 18 millimeters and we will reduce the other
the pixel sizes and the current proposal is a 1515 Don't micrometres. So this will
of course greatly improve our pointing resolution by a factor of two compared to
the first upgrade of the IPS in the foot PT Ranger, but also the tracking
efficiency that will increase by up to 1.2 to two compared to the inner tracking
system to in the low PT region. So, below under the V oversee several measurements
will be greater and here I have a non exhaustive list of data, which included
the low mass di leptons are the measurement of beauty strange medicines
and beauty baryon. So, the champ strange and strange variants production and the
searches for light charm I've been apply so I don't have time to discuss all of
them. So I just chose some of these that I will show you in the next face. I was
taught from the law master leptons, which is a Particularly particularly interesting
in our field, because the slope of the entire mass distribution at intermediate
masses, so between say one and two is related to the cutiepie temperature. So,
the precise measurement will be very important to define the TDP temperature
and the IQ three will will greatly help in this by providing a much better chance of
rejection and also much better rejection of the contribution from gamma
conversions. The reduction of the systematic uncertainty that we foresee
with the ITC is up to up to two and the statistical uncertainties are four factor
three and you can see in the bottom right plot, how this will impact in our
determination of the PGP attack. The second topic that I would like to discuss
is the study of the beautiful colorization mechanism in the courtroom plasma and in
particular, I will start I will start to discuss the recent nasm doctrine, which is
expected to be announced if the beaut quarks are denied via recombination in the
plasma due to the analysis strange core production in Indonesia itself. So, in the
left plot, you can see the improvement in the statistical significance that we
expect in the measurement of the P sub s Mason production with the ITC compared to
the IPS tool, and on the writer you can see the projected nuclear modification
factor which as you can see, we provide the basically, the ITC will provide us
access to the measurement down to very, very low PT for for idi conditions
and the exclusive
Trouble is the only way to measure the beauty of strange production. In the in
the courtroom plasma, we can also explore to nonprofit service which largely come
from be subsidized loans. So even if it's not a direct measurement, it's sensitive
to the service production and it has the advantage of having legit statistical
precision that exclusive b sub s reconstruction. So, on the right again you
can see the projected the
expanded the
Thank you, nuclear modification factor for impromptu discipleship. And as you can
see, we will have the sensitivity to distinguish the two scenarios. So the one
of the non prompt to the suppressor, which comes from the B sub SDKs and the non prom
to the zeros which means that comes from non central demand zones and are not
sensitive to destruction. Thanks to the larger statistical procedures of the non
property service, we will be able to To look at more differential observables as
the azimuthal anisotropy which is connected to the participation of beauty
quarks in the collective motion of the system, and its possible thermalization in
the problem plasma, so it gives us more information about the beauty called
diffusion coefficient in the queue GP. And as you can see in this direction, the IDS
three will give us enough precision to distinguish between the expected as the
motor isotropy for prompter and prompter D sub s medicals.
Finally, add
beauty quantization can also be studied via the production of beauty baryons. So,
in round two Ellis already performed several measurements of charm barium
production and observed and mass production compared to classy minds,
collisions, already MPP collisions but even even larger Let that conditions. So,
the idea is when the ITC will provide us the possibility to study also the beauty
barium productions and the ITC will will give an improvement of statistical
significance of cofactor 2.5 with respect to the idea is to the last topic that I
want to discuss is expected performance for the searches of term hyper nuclei
which were predicted already in the 70s and never observed. So, the lighter
possible state is this bound state of lambda C and the neutron which is called
the neutron for which the ITC will be crucial, since the expected decay length
of the CDU term state is approximately the same of the one of the lambda C which is
around 60 microns. So, in this plot, you can see basically the comparison between
the impact parameters of neutrons from a CD case which will be our signal and the
primary neutrons which will compose the largest contribution to the to the
background. So, this brings me to my summary at the Alice experiment is
undergoing a major upgrade already long shutdown to in view of the list here on
three butter, we are preparing new upgrades for the receipt on car which
includes forward kilometer bespoke Allah mendy for the to set constraints on them
clarified yet so, in the low x region and these innovative truly cylinder calcium
detector for the inner layers of the IPS which will be which will be based on new
13 wave size sensor which will improve the doctor the measurements of low mass
electrons, hf particles and the searches of exotics. And thank you for your
attention.
Thank you for Talk
alright.
Other Any questions?
Does the raise hand function actually work?
Ah I see I see a raised hand on the panelists Nicola please go ahead you can
unmute yourself, can you hear me? Yes,
yes, I was interested in the in the measurements that you showed to the
announcement of lambda c over d zero. So,
this is
measured only in this
lead lead or it is also expected in other collisions. So, in this plot, you can see
basically the measurements in PP collisions which had the green points and
then in lead lead collisions, where you have basically two centrality classes so
in the ion collisions We divide the events in society classes, and the red ones
corresponds to the most central conditions. And so as you can see the the
announcement that we measure is already there in the teepee conditions. And indeed
there is a tension with the with the measurement of ABCD.
Because also for ECB, our
announcement is measured, but it's quantitatively smaller. So this is a is an
open question at the moment, which could point to rapidity dependence, but it's not
not solved yet. Thank you.
There are more questions.
I don't see any more All right now,
I think we can also just
open it up for questions with respect to all the talks, because we do still have
about 10 minutes left for discussion if needed. So, if there any more questions
either on for Rich's talk or on any of the other talks or somewhat related to the
overall picture that was shown for the for NHD experiments, some respect to their
next upgrades
Please go ahead.
Okay, if not, I do have a question for ability which is more hardware related but
So I'm quite impressed by this ultra thin wafer. So does it does it also contain the
reader electronics in addition to the to the center? So is it just the center?
Yeah, so I mean, I didn't spend much on on the other, but the sensor will be one
monolithic active pixel sensors. So the yard readout from the front end result
would be in the in the chips themselves. And these of course, will will lead to
decrease even added the material budget.
Absolutely.
But unfortunate that we might have too much radiation
to the house for the detectors. Yeah, of course, he nearly said the radiation is
different than Atlas and CMS but yeah.
And while you since you asked, I didn't have time, but I also prepare the slider
Next, the round five In preparation, where this technology could be exploited even
more, and we are thinking about this old silicon detector, which, which of course
in the inner layers will exploit to these same sources. And this is also in my
opinion very interesting, we will get rid of well, we will remove, of course, to the
PC to go faster in the result of events. And, but, but keeping the particle
identification with with time of flight layers, and of course, if you're
interested, we had a talk yesterday by Roberto so you can have a look at the
slides.
That's indeed an interesting concept.
Are there any more questions?
I don't see any raised hands.
Everybody wants coffee. I hope you all got a coffee machine at home.
Okay, in case there are no more questions
I would just like to remind you all of the coffee chat room that are failing to his
slides in case you have more questions and dialogues. But maybe also the other
speakers from the session want to join there and can also answer more questions
in case they come up over coffee. And other than that, I think