It's nice, thank you. Okay, thank you. So with afternoon I am going to present the
latest results on the measurement of tiki bar and the bar plus b flavor cross
sections performed by the CMS collaboration. These measurements cover a
wide range of different production related topics, measuring inclusive and
differential corrections in different financial states, okay, medical regimes up
to now or the results that are applying the below it with deposition. So the
standard and are based on ethnicity of 55.9% or 30 db. So I start with the most
recent measurement that 13 TV covering the electron neon tower and finally state that
this final state has the property that in one side that the Quark decays exclusively
to generation particles, and so it might be particularly sensitive to be
understandable. In this channel, the signal includes only tau litems that decay
ironically, and events are selected by requiring one isolated election or at
least two gates on exactly one other candidate. At least one of the Gates has
to be there, let me unpack it and contribution comes from events where they
get this misidentified person. Another another Nika tau m comes mostly from the
electoral process events,
dissing our background
are defined as a as a function of the distance variable defined here. That is
obtained from the triplets II and is constructed for each combination of one
target and one target including the other candidate. And he's calculated to check
the compatibility of the different combination of hits to come from the top
decay chain, including the W then the rent is assigned to be signal like if there is
only one And packet or if the minimum value of the distance is larger than 60 gV
as shown in the figures, then the mass is used as it provides separation between
seeing other background and does not significantly depend on the transfer of
momentum and entropy of the of the Atlantic. The two figures a show a
transverse Masisi beaten into me on other Nikita final estate for the signal and the
background like even categories appear to the fitting it then the cross section is
measured by performing a profiler, you convert your feet to the transverse mass
in the kinematic activities define the previously 40 events in the electron and
the final states because section is derived from the signal strength and
measured in the feet and the event is the background process misidentify tau are
also that determine the the largest experimental uncertainties comes from the
identification On misidentification of the Atlantic town from bilac estimation, why
is the largest theoretical uncertainties due to the modeling of the quality in the
DT versus the required fragmentation and the pattern then the construction is
measured in the future spatial data and then extrapolated to the to the full
Fisher space using the acceptance estimated from simulation demands to be
781 be combined consistent with a version of the standard multi tiered approach and
then the ratio of the corrections in the electronic towel to the light delicto
Finally, states history social measure to be born in 1973 with a systematic
uncertainty of 7% and it's found to be consistent with one spective from a list
of universal the measurement also provides a an estimate of the ratio of the partial
to the total width of the of the top part decay to be a point one Five, dominated by
the systematic consistency this measurement in any case improves the
previous measurement and is consistent with the standard. When this measurement
there represents the first of the TDR correction correction at 50 db, without
any color decay into leptons and a improves the relative position with
respect to the period results at the lower end.
Here a
the left figure shows a summary of the inclusive corrections measured by CMS at
30 Db using a fraction of the luminosity collected at this entity, where it can be
seen clearly that the Chinese have been already conceded, while the electro neom
channel provides the best sensitivity with the main systematic uncertainties coming
from the modeling of the developers process at electron Attica efficiencies.
And the red plot shows the TT bar inclusive cross section measured by CMS at
the different center of mass energies that we that he operated Including the tomato
measurement and also the measurements in the electron and electron projects
Finally, states performing fit can be seen all results are consistent with the most
precise with the most besides in in a low blessing in a theoretical calculations on
with unexplained experimental sensitivity, that which is valued in the range of three
to 3.5%. CMS has a strong problem of measurements of divide and additional
kidney flavor. It's
the measurement of these processes has the challenge of having lots of uncertainties
in the analog calculations into the scale variations and also because the divine
processes have very famous case the measurement of course, is essential for
the study of the dth production of the Higgs and also for the termination of the
Four Tops and the de vida de vida. Manuka she went back home for the dth when the
hits the case of Ebola and the DPT autism introducing or background going that are a
misidentified cross section is measured in the electronic final estate. For two
definitions of the Tiki Bar cross section in the initial phase of space Park and
based on pattern independent dining the total feature space, they are showing the
figures compared with a location from a as can be seen the predictions on that
estimate, they measure procession by a factor by factors of between 1.4 1.5 and
2.4. That corresponds to a one to one standard deviation. But the results are
consistent with previous measurements. And CMS had 13 and also at the end, the right
here shows a summary plot of the
new vertical section
with respect to the standard deviation in the free Fisher space. As can be seen the
measurement the electron and the composites that I described Next are the
most precise with it. propeller different certainties, if they have the order of 80%
for the electron channel or 14% for the lip. Here a pretend the measurement of the
perfection for the production of the of the Quark in association with a better pH
or in association with a bit of different products of any flavor or we want the
ratio in there one in the finite states with one or two that are performing
depending upon channel events are selected that with two oppositely charged leptons
for our module, a of which are these two have to be wiling the electoral process
channel events have a need to have exactly one isolated electron or Mian because in
this in this case, they said they they went off selected a in an orthogonal way
to the final estate, at least six sets are required, of which at least the two have
to be identified as beacons. In the baritone channel i based on MonteCarlo
studies the kids with the third and the fourth largest stubby scheming and values
are considered a position audience why for the composite channel
sorry for the composite channel
a given it's a larger number of the assignment based on the kinematic
kinematic fee supplied after which the addition objects are arranging additional
that of the of the tagging other are considered essential. If you go to a here
shows shows the discriminant from data from the predictions and as can be seen,
they are to distinguish between the different the DTG categories, then the
cross section, the ratio and the actual tttt cross section as soon as they started
using that being maximum likelihood fit to the two dimensional add to the two
dimensional distribution of the diagonals came out of the two additional years and
they both the channels are fitted independently because of the different
facial space that they cover and within them the defendant finally states at the
same time your feet can be can be seen here along with 68 or 95% of users and the
measurement is in the full feature space as shown here for the purposes finally
states that to measurement in the free feature space I need a wallet with the
MonteCarlo patients for poker okay I must have interfaced with became white patients
for from a pocket plus a head which a black black plus plus for the ratio and in
consequence for the divider DB but processions are is likely a slightly lower
pay than the initial measurement in this in these final states. In this lip plus
its final state represented The most precise measurement of the inclusivity
divided up by entity by the age of projection and also a PE of the ratio. So,
moving on to differential protections and double differential length delivered on
Channel are presented here together with the structure of the stone copying
constant and some PDF information and then normalize the differential procession of
the production or measuring the full thesis based upon the level for several
variables that are sensitive to different aspects of the DD vital a production
dynamics and the typical differential is also measured as a function of the
extracted the multiplicity and compared with differently chosen from different it
representative distributions are shown here. I in the left that the transverse
momentum of the work is compared to the different grains during the sort of
ability to produce predictions from from them. As can be seen that our basic
mission is software About the predictions in the entire era PT range and only pocket
plus head week describes the data worldwide the other two simulations
predict how to expect
in the right figure
that is the typical differential projection as a function of that ability
of the device system in the for in the empty divided and get the range
are shown
as a function of two or three a, if I were to get one measurement or not, or
MonteCarlo described it that well, while for the three that we in the poker plus PC
is in satisfactory agreement with
here
that some coupling constants have been extracted from the measure typical
differential perception when compared to fixed sort of initial prediction. The
value is extracted at the low and compared with the world average in the figure,
where a one can see that the uncertainties from the data from PDF from a scale from
when people are comparable magnitude stating that the precise and reliable
instruction of advice can be obtained only a when synchronously fitted together with
the PDFs. Here the the initial cross section have been included in the fee
together with a hida deeping SDK scuttling data to constrain alpha is a MP poll and
PDF distributions, especially of high value effects. And as can be seen, the use
of TP var measurements
has a significant impact
on the global distribution, especially in the range between point one
and a finally a new three.
You have three minutes left,
okay. Yeah. Okay. Thank you. So this is the my final, my final topic. It's a new
measurement of the production and production for a hike a transversal
momentum works in the other any kind of complexity. a finite estates, a it, this
measurement allows us to start to access the happy medium, with some precision
beyond Of course, that each of the ratio of analysis of the value of the beauty of
the quality of the order of four above 400 it could be sensitive to new physics. And
it's very important they say very important this for a particular
application in the only channel a too large set reduce it, so we do have the 400
DVR required. And then events are classifying using the TTB event tagging
based on neural network that uses yet sub sector variables for which two categories
are based on the subject to be tagging the syllable control region on the Twitter
signal. Their background is completely dominated by GCD and uses the metaphor
then a maximum likelihood fit is performed to the mass of the of the Living Dead as
shown in the figure. And differential perception test actually does function of
the leading edge team topics That ability and also oh by the delivery system like
like the mouse. So, here are the live templates your final state is presented
and is defined by having one boosted automatically you can gain top and
wonderful for electronically decaying work and events are categorized in terms of the
PMP candidate passing the tagging requirements as described the backgrounds
are estimated from the catalog set that gives you the that the system may differ
from each other and then anytime you say being the maximum is 10 is maximum right
to make the maximum likelihood feed to ethical research shown in the figure
is performed and then
the device illustrates the top tagging efficiency skill factor and the
normalization of the device a signal strength is obtained from to the point at
one plus minus a point.
Here a results are apathetic, only normalized differential intersections
as well as the uncertainties that are shown here. It can be seen that the
measurement is still clearly statistically a limit and when compared with Fenella
MonteCarlo why is that for another challenge the shapes are in general in
general compatible a with the predictions I'm not no pts Lopa PS are for the lipo
plus channel. The normalized differential distributions are generic when described
by the three
showing somebody a the first measurement
a on the electron me on a toddler and finally state but format 13 TVs presented.
The measure cross section is fine to be in agreement with the standard model and a
the ratio of the electromagnetic tower with a light leptons is consistent with a
comfortable universe and the measurements from the device of The dividing
association with heavy flavors has also been presented with results from from
Lipton Plus, it's been the most precise, and with measured values that that is like
the largest and then finally, differential procession measurements were also
presented. And any measurement that MTV or boosted the aquatic center a otherone
conducted plus its final state washroom, in which they predictions a slightly
overestimating Griffin cross section. And the normalized differential cross section
showing the annual variable argument we say.
And that's it. Thank you very much.
Yeah, thanks a lot of you for this very nice overview with these new results.
Other questions? I don't see any hands raised yet. So maybe I asked a quick
question myself. So on page 12, I'm not sure if I fully understood why your
signals so you say Your signal strength is 4.8 with an uncertainty of 4.05. But
wouldn't that mean that you that you underestimate? I mean, maybe I don't
understand how you have defined signal strength here. So you have 20% less TT bar
cross section than you expect.
Yeah, that's that's very sad. Yes,
this is the result and this is obtained from the maximum likelihood fit to this
category. Say, Hello in this
setting is 10, the scale factor the tagging the top dog in a scale factor
and the normalization to ethnic categories, and this is the result that is
found. Yes.
Um, but, but on your last like you said, You're overestimating the cross section.
I think my prediction is overestimating the cross section is what I say.
I'm not sure if I fully understand it yet, but I I'll have a look. I see that there's
one more race and Francesco Can you speak?
Hello, this is Francesco again from Atlas Hello. Hello, how are you? Thanks a lot
for the interesting presentation. I have a couple of questions on slide seven is late
13. I'll try to make them quick so wasting time slide seven, I was wondering what is
the role of Intel in terms of impacts of systematic uncertainty on the background
subtraction on this in this measurement, particularly on the TT BJ
Do you consider that as soon as you can see that as a backer, right, because you
want to you want to dye factor IV VB? Yeah, in fact,
yeah, I don't
remember exactly the number but I know that this this finally status is
extrapolated from the T divider, b a, and yet a final state so its presence is
clearly important. I cannot tell you which is the exact number but this this number
is it's important in the separation, this
Francesco could we put further questions to a separate discussion because We are
running late and the plenary session is already starting in about half an hour.
Okay, can you do that except on bit of importance of the city by
region?
Yes. Have you do you also have an extra room for discussions are
no but they can create their
one. I can.
I I thought that I could use my personal one. Maybe I can use it.
Yes. Just put some information on your slides. Okay. Okay. I don't want to to
discourage discussion just we have to move on.