Juliette Alimena: K,
Juliette Alimena: okay, maybe we can slowly get started.
Juliette Alimena: So welcome everyone to the Fccclp meeting
Juliette Alimena: and just have a couple slides of news
Juliette Alimena: which are a bit of a repeat. But I think it's important. So I want to make sure everyone gets the message.
Juliette Alimena: So as you probably know the Fcc. Report that I mean the midterm report is available on the new Cds to in principle to to all certain users.
Juliette Alimena: So if you can't see it.
Juliette Alimena: let let let me know, so we can figure that out. Susan, do you already have a comment on this.
Susan Gascon-Shotkin: Yeah, because you put your mouse there. It just is the apple site. It's bizarre. The link is just the Www. apple.com.
Juliette Alimena: Oops. Let me fix it. I'm.
Susan Gascon-Shotkin: Yeah.
Susan Gascon-Shotkin: yeah, it was kind of all of a sudden, I see ads for the
Susan Gascon-Shotkin: whatever I mean. So yeah.
Juliette Alimena: I'm sorry I've clearly done that wrong. Let me fix it.
Susan Gascon-Shotkin: Could happen to anybody.
Juliette Alimena: I think I copied someone else's slides on this, and the link broke
Juliette Alimena: or got got renamed somehow. Odd? Okay, good. I'll fix that. And then right for the final feasibility study report. Basically, that will be submitted to the the European strategy. Us on the Ped Fcc side.
Juliette Alimena: We'll need analysis notes ready by basically early September. So if you're going on vacation, that means, and probably you are the summer. That means you should be already working, I think, on analysis notes
Juliette Alimena: so that we can have a draft 0 for internal ped review in in total by the the end of September.
Juliette Alimena: so that the 1st draft
Juliette Alimena: can be ready for the Spc. By the end of the year. So that's the idea. And this sort of September Octoberish deadline is in line with the the deadlines, where the deadline for new results. For the 3, rd Efa Higgs factory workshop is the the workshop in in Paris, in October. So this is an important date. And please consider going to to Paris and presenting your results there.
Juliette Alimena: M.
Juliette Alimena: So in general, about the Fcc notes. The there was this sort of common sense policy on on the writing of these. And if it includes
Juliette Alimena: basically if you're using Fcc. Analysis.
Juliette Alimena: So the the money, Carlo, the tools, statistics, statistics provided centrally by the Fcc. Group, and it has Fcc. In the title. We should probably have a note on it.
Juliette Alimena: So
Juliette Alimena: And we can put this note in the the new Cds, and then have a presentation or or more at the physics performance meeting, and also in this meeting leading up to that that would be great.
Juliette Alimena: And then the physics and performance conveners will define reviewers for speedy decision on the the submission.
Juliette Alimena: Yeah. And the last point, I think, is, is probably obsolete at this point.
Juliette Alimena: So this is my my last slide. So today we'll have final presentation, for from Mark Lars Larsen on exotic Higgs, the case to to long with particles, specifically hydronic and visible Zd decays.
Juliette Alimena: I noticed that the next physics and performance meeting is July 15.th I think that's Monday. So here's the the link to that. Of course, you know, upcoming in about a a week is the start of Ichep
Juliette Alimena: there's many Fcc talks and posters being presented there, including a talk on Bsm. Physics and Hnls. By Nicolo, and I think it's a poster on lps from exotic kigs to case by Axel.
Juliette Alimena: So don't miss those. And then, of course, there's the Ecfa workshop in in Paris, and there's the the link there. Registration for that is is open, and the submission. Abstract submission for for talks also closes on on Monday.
Juliette Alimena: So that's that's tight. So please submit an abstract. If you would like to to go the deadline for post. Their submission is a little bit later. So that's good.
Juliette Alimena: And then there's the Italy, France, fcc workshop in in Venice in November.
Juliette Alimena: and, as usual, at the bottom. Here I've got the links to other Fcc meetings that might be of note besides the physics and performance meeting. There's the full submitting meeting, fcc analysis meetings, and then generally, Ecfa seminars and workshops.
Juliette Alimena: Okay, I think that's all. I had other comments or questions.
Juliette Alimena: and I will fix the link on the 1st slide.
Juliette Alimena: Yes, Susan.
Susan Gascon-Shotkin: Yeah, sorry it's me again. So
Susan Gascon-Shotkin: for the Fcc.
Susan Gascon-Shotkin: Notes. So I guess that will be the
Susan Gascon-Shotkin: though having an Fcc. Note is a prerequisite to
Susan Gascon-Shotkin: having the content in the, in the feasibility study report. Right? I mean the okay.
Susan Gascon-Shotkin: And is there a template available like an overlay for something for that? Or.
Juliette Alimena: I don't believe so.
Susan Gascon-Shotkin: Okay.
Juliette Alimena: I think I think they didn't get that advanced on on that but there are.
Susan Gascon-Shotkin: Ring.
Juliette Alimena: Yeah.
Juliette Alimena: no. I think people have just been sort of
Juliette Alimena: putting something to together.
Susan Gascon-Shotkin: No problem. It can be done like that as well, of course.
Juliette Alimena: Don't worry about the formatting. It's better to sort of get it written down.
Susan Gascon-Shotkin: Okay? And then for the Paris workshop.
Susan Gascon-Shotkin: So is there some? I mean, okay, I'm on the Speakers Bureau, the Fcc Speakers Bureau. So I was wondering if if the abstract should should be passed
Susan Gascon-Shotkin: to the Speakers Bureau first, st I mean, have you, as conveners, had any direction on that.
Juliette Alimena: We've.
Susan Gascon-Shotkin: Yeah. And and this, because, there's a little bit of confusion, I think there. So.
Juliette Alimena: Yes, definitely, in the last week or 2 Pat has emailed us saying, Are you organizing abstract submission? Are you organizing, inviting invited talks. And it's a bit difficult, because at the moment both Rebecca and Giacomo are on vacation. So from.
Susan Gascon-Shotkin: Is.
Juliette Alimena: It's I think it's a bit uncertain however, Rebecca did chime in from from vacation, and responded, saying, Well, she's also, you know, organizing things on the extra side as well. So if we don't get all the abstracts that we we want in time for for Monday. Then we can also, from the, you know, organizer side. Also. Ask for for talks after Monday.
Susan Gascon-Shotkin: Okay. But so we.
Susan Gascon-Shotkin: there's no problem with submitting an abstract directly to the site, actually. Or did you want to see them first, st or I mean this kind of.
Juliette Alimena: Yeah, yeah. And indeed, that was your question.
Susan Gascon-Shotkin: I.
Susan Gascon-Shotkin: And not just me. I mean that. Okay, I'm I'm I brought this up to the other members of the Speakers Bureau. I mean, pat was in CC. And
Susan Gascon-Shotkin: I guess there hasn't been any reaction yet, because there there are other more urgent fires, for before Monday that they're fighting, I guess, for other conferences. But
Juliette Alimena: And see.
Susan Gascon-Shotkin: Maybe it would be good to have some
Susan Gascon-Shotkin: procedure. Okay, so that things I don't know so that we know basically what to do. So.
Juliette Alimena: Yeah.
Susan Gascon-Shotkin: Sorry. I didn't mean to take too much time about this, but.
Juliette Alimena: No, no, it's fine. I I think it's a good point. But at this point also given the fact that it's, you know, Monday. I think if you want to go to to Paris, just submit an abstract. Don't worry about
Juliette Alimena: approval or
Juliette Alimena: or organization. Unfortunately, at at the this, you know the 11th hour.
Susan Gascon-Shotkin: Okay.
Susan Gascon-Shotkin: okay? And now, with final thing, with my hat, as I actually, I'm on the Organizing Committee of the Paris workshop.
Juliette Alimena: That's great, excellent.
Susan Gascon-Shotkin: So just a message that there will be a poster contest with prizes.
Susan Gascon-Shotkin: So it's an encouragement for the younger participants to and also reduced fees for
Susan Gascon-Shotkin: for poster submitters
Susan Gascon-Shotkin: so
Juliette Alimena: I will add that to the slide.
Susan Gascon-Shotkin: Propagate that. And hopefully, there'll be a lot of good posters
Susan Gascon-Shotkin: submitted.
Juliette Alimena: Okay, excellent.
Juliette Alimena: The this deadline for the Posters Mission, September 30.
Susan Gascon-Shotkin: Is.
Juliette Alimena: Accurate, right.
Susan Gascon-Shotkin: Yes, yes.
Juliette Alimena: Okay.
Juliette Alimena: okay, good.
Juliette Alimena: Okay. Great. Anything else on the news?
Juliette Alimena: All right. Let me stop sharing. And we go to Mark.
Juliette Alimena: Okay.
Mark Larson: Share my screen.
Juliette Alimena: Awesome.
Mark Larson: Can you see this? Alright.
Juliette Alimena: And it says it started screen sharing. But I now I see it. Okay.
Mark Larson: Yes, I'll be talking about the work that we've been doing in the past few months now which is still extending this
Mark Larson: original analysis of exotic case decays to long live particles based on the work by Magda, Julia, Axel, and Rebecca
Mark Larson: And so this is now specifically trying to incorporate the hydronic and invisible C decays into our signal.
Mark Larson: So for a bit of a reminder the original single process that we're targeting is at the 240 G Zh. Production stage.
Mark Larson: With this following single process.
Mark Larson: in which we have our Z decking to either a pair of electrons and Muons and Higgs decaying to our 2 long-lived scalar particles which are then decaying each pair of b quarks.
Mark Larson: And so this provides, notably the 2 following experimental signatures of a reconstructed zet boson from the electronic muon pairs.
Mark Larson: and these thirdly, displaced vertices from the B pairs from our long lived scalar case.
Mark Larson: and so, as an extension of this, we hoped to just increase sort of these signal statistics
Mark Larson: available for this process, and because the the branching fraction of the
Mark Larson: sent to
Mark Larson: e plus e minus or mu plus mu minus is only about 7% of the total cdk modes. This is to some extent limiting the signal statistics, and thus the maximum sensitivity.
Mark Larson: and so incorporating now the
Mark Larson: Z to invisible decays, adds about 20% of the total branching fraction.
Mark Larson: and then incorporating the Z 2 hydronic case adds another 70%. So this would allow us to greatly increase our signal statistics and thus hopefully desensitivity as well.
Mark Larson: And so to start with this, we generate new samples again, using mad graph. And the winter 2023 idea card using again the same 6 original signal points that had been used with the original analysis
Mark Larson: in which we vary either the mass, the scalar, and the mixing angle which has, the effect on the mean proper lifetime here, which gives some expectation, for whether or not we'd be able to actually observe the scalar decaying
Mark Larson: within the detector or not.
Mark Larson: And so these new samples that I've generated are now also available in the Llp. Eos Directory. Here.
Mark Larson: under this exotic kick, sample Cld Directory, which also contains the Cld card generated samples for the original electronic case to.
Mark Larson: and so to maintain the necessary background, rejection, signal sensitivity. The idea here is to replace the 1st 2 of the originally used cuts, which were originally a pre-selection which is selecting 2 obsolete charged electron muons, and then the z boson tag. Here on the variant Lepton, Mass.
Mark Larson: But notably we want to retain this final displaced vertex cuts, which was providing by far the majority of the background injection.
Mark Larson: and hopefully allowing us to identify these these longer particles.
Mark Larson: So I'll 1st talk about the more successful of the 2 results, which is the Z 2 invisible decays or Z. 2 neutrino here.
Mark Larson: and so I'll 1st mention that we now incorporate 4 additional backgrounds here.
Mark Larson: which is again using Z. And WW. Which were used in the original analysis.
Mark Larson: But with the winter 2023 background samples. The ech, there's there's no longer an inclusive z sample.
Mark Larson: So we now split our Z sample into, of course, C, 2 pair neutrinos.
Mark Larson: and then, notably just for a sort of 1st order. Right now we take only H. 2 Bb. And H. 2 www.
Mark Larson: And so, because for these backgrounds we still have between about 10 to 50 events which would pass this greater than equal to 2 displaced vertex cuts.
Mark Larson: we still require a decent amount of initial background rejection in order to fully reject our background.
Mark Larson: and so we found that in the end. The best way to do this was cutting on the energy from the missing et branch in the root file.
Mark Larson: and there's still a bit of confusion, I think, as to whether or not this is the total
Mark Larson: or transverse missing energy for each event, but
Mark Larson: nonetheless cutting on this provided some fairly good results.
Mark Larson: So I'll show some distributions now of this
Mark Larson: missing energy value, and this is showing for 2 of what we consider most important signal points which
Mark Larson: previously saw the best sensitivities
Mark Larson: based largely on their decay length, I guess.
Mark Larson: And so we see a peak around just greater than 50 G-ev here.
Mark Larson: And this is, more or less the same for
Mark Larson: Most of our signal points here.
Mark Larson: with the exception of the very long.
Mark Larson: long lived signal points in which.
Mark Larson: for some reason, if these scalars are decaying outside of the detector, it didn't seem to register any missing energy at all.
Mark Larson: But nonetheless these distributions look quite different than the background distributions. And here I'll just show the Ww. Here on the left
Mark Larson: and the Zc. On the rights in which you can see that there's a fairly flat distribution
Mark Larson: at our peak around 0, missing energy for Ww.
Mark Larson: So not too many events within the range of our peak, around 50 G.
Mark Larson: And a sort of similar case for easy background as well.
Mark Larson: And I'll note that the 2 Zh backgrounds that we consider do look fairly similar to the signal.
Mark Larson: However, this didn't prove too much of a problem in terms of actually obtaining our cut efficiencies, which
Mark Larson: I'll show it now.
Mark Larson: So after a bit of optimization. We settled on a cut of between 30 gev. And 70 G. Ev. For missing energy.
Mark Larson: and this is perhaps a bit loose.
Mark Larson: but it nonetheless provided nearly full background rejection.
Mark Larson: And again, for the case of the I guess not. So long lived signal points here. So, with the exception of this 20 g. The sine theta, one E negative, 7
Mark Larson: signal and 60 Gv. Site. They don't want a negative. 7 sample.
Mark Larson: We have fairly high signal efficiency, using this missing energy cut.
Mark Larson: And then in the end, we obtain fairly similar results to the efficiencies for the original electronic decay.
Mark Larson: Analysis here
Mark Larson: and then also somewhat similarly, we obtain nearly complete background rejection here, with the exception of
Mark Larson: our Z to Nu and H to Ww. In which one of the
Mark Larson: should be a hundred 1,000 events past and so this corresponded to
Mark Larson: point 7 1 events after we waiting for the luminosity we're considering here.
Mark Larson: So we have
Mark Larson: a small amount of background or passing this, this cut flow. But
Mark Larson: nonetheless.
Mark Larson: we thought these were decent enough results, I suppose.
Mark Larson: and so now I'll show the signal sensitivities or event yields here.
Mark Larson: And so, as expected, with again the higher branching fraction here for disease to new relative to
Mark Larson: Zd plus minus or v plus b minus
Mark Larson: we see that we have an increase in about 3 times in terms of our
Mark Larson: total event, yield for most of these signal points here.
Mark Larson: with the exception of this final single point, which increases by just about 2 times.
Mark Larson: and notably, we can say that if you at least combine the results somehow of the
Mark Larson: original analysis, which is on the right here and our new results on the left here.
Mark Larson: that we would gain sensitivity. Now to this 20 g. Be sine e negative, 7. Sample here
Mark Larson: with just exceeding the sensitivity threshold of 3 events.
Mark Larson: And I'll note that I have yet to perform the inserting calculations. And we may see.
Mark Larson: fairly increased uncertainties, both because we have now larger luminosity. And because we have now
Mark Larson: these point 7 expected background events to consider as well.
Mark Larson: So now I'll shift gears to discuss again the strategy and results for the hydronic cbase.
Mark Larson: and I'll note that this was quite a bit less successful, I guess, than the Z 2 visible case.
Mark Larson: So to sort of premise. This I'll mention, and I think I had mentioned this in the last talk that I gave, but we were having quite a bit of difficulties performing jet clustering.
Mark Larson: and so, after initially generating the samples we found. That's by default the winter 2023. Delphi's card is doing this exclusive N equal to, I think Durham algorithm jet clustering.
Mark Larson: and this provided a bit of initial confusion that took some time to work around. But, thanks to the help of Magda and some others, we found that we needed to replace the jets in the Sec analysis framework.
Mark Larson: And so at 1st I tried
Mark Larson: quite a few different ways of inclusive jet clustering just varying different parameters to see
Mark Larson: different results.
Mark Larson: And while for certain single points we did get agreeable with what would be expected results.
Mark Larson: in the end couldn't find an an algorithm. That sort of worked for
Mark Larson: all 6 or sample points or signal points here.
Mark Larson: So in the end we decided to pivot toward a sort of new strategy
Mark Larson: in which we 1st perform our displays for texting, as we did normally.
Mark Larson: and then notably remove all particles associated with these reconstructed displaced vertices.
Mark Larson: So we anticipate this to remove the 4 P. Jets that would be coming from our longly scalar case.
Mark Larson: and then, with our remaining particles we perform a
Mark Larson: exclusive jet. Clustering algorithm here set N equals 2 again.
Mark Larson: and notably we repeat the same process for both the signal and the background, despite not always anticipating there to be 2 jets
Mark Larson: appearing within the background. So we're
Mark Larson: more or less evaluating on the 2 jets that are reconstructed from the background.
Mark Larson: But this is sort of required to allow some consistency for
Mark Larson: the actual cuts that we perform
Mark Larson: on the jets that are reconstructed.
Mark Larson: And so I'll mention again that we add quite a few different backgrounds here. So again, Wwc.
Mark Larson: and then we have a total of 8 different z-hydronic samples, and again, just considering H. 2 Pb. And Hw. Here.
Mark Larson: And so we sort of wanted to mimic something like the Zinevarian mass cut. That's done by the original analysis, and so
Mark Larson: decided to try to perform a cuts on the total sum to energy from these 2 reconstructed jets for exclusive clustering algorithm.
Mark Larson: And our hope is that again, this would provide a at least initial small level of background trajection while maintaining a fairly high signal sensitivity.
Mark Larson: And again, because we have between something like 10 to 50 background events out of our 100,000 or so
Mark Larson: in which we have to enable the 2 displaced vertices reconstructed. This is important that we have some level of background objection.
Mark Larson: however, because I sort of ran out of time in the end. We didn't end up performing any further cuts or really further optimizing these genuity cuts which will need to be done in the future to
Mark Larson: achieve adequate levels of background connection which we'll see in a second here.
Mark Larson: So we'll again show some distributions. Now of this total jet energy for each of our events.
Mark Larson: Again showing what are the the 2 most sensitive signal points here.
Mark Larson: And so here we see a peak just above Z mass looks like.
Mark Larson: and a fairly long tail really in both directions here and in the end this influenced us to have a sort of looser cut, so that we could at least see the possibility of our total signal statistics that could be added.
Mark Larson: and then I'll show here on the left
Mark Larson: the again. Some jet energy prevents of our Ww. Background.
Mark Larson: which you can see has really a fair amount of overlap with the the signal distribution.
Mark Larson: And of course, looking at the Ch. Here Z. To Bb and h to Ww, we see
Mark Larson: again, really quite a bit of overlap in the shared energies. So
Mark Larson: in the end there's only really so much
Mark Larson: background projection that can be obtained by performing the cutout digit energy, so
Mark Larson: in the end likely an additional cut will be done.
Mark Larson: and this is, of course, similar to the other 7 Zh backgrounds that we have here in that distribution looks basically.
Mark Larson: So in the end, as I mentioned, we perform a very loose cuts between 40 Gb. And 140 gb.
Mark Larson: Just for the point of sort of retaining a high signal efficiency to at least give an indication of the potential increase in our signal yield.
Mark Larson: And again, this obtained very similar efficiencies to both leptonic and visible decays.
Mark Larson: And however, we have
Mark Larson: sort of very low background trajection here.
Mark Larson: and so in this top column. Here I report the efficiency for our jet energy cut
Mark Larson: and then, rather than showing the the very small fraction of efficiency which is something like.
Mark Larson: I believe, 10 to the negative, 4, 10 to 5. In many these cases.
Mark Larson: I just show the the total events expected based on our our given loop. Lastly, again.
Mark Larson: and these are organized here by these decay mode, which
Mark Larson: for this case, Qq. Is is either an up or down a quart and then again, we have just the Higgs, the K. Mode to either Ww. Or Bb.
Mark Larson: and so we see that's
Mark Larson: there are quite a few background events that pass these cuts
Mark Larson: so clearly quite a bit of more, either optimization or more likely adding additional cuts done
Mark Larson: to obtain a more reasonable level of background injection.
Mark Larson: But nonetheless, I'll show the what I'll call potential signal yields here, I guess.
Mark Larson: Assuming that you could achieve better background projection with
Mark Larson: similar signal sensitivity
Mark Larson: by again still performing this displace. Vertex cut.
Mark Larson: And we see here that we're increasing now by a factor of something like 20 times
Mark Larson: that of the
Mark Larson: original Platonic decay. Analysis, however, of course, this is with the stipulation that this is now rejecting a large number of background events, so
Mark Larson: likely these numbers would decrease, possibly significantly, and can't necessarily determine sensitivity at this stage, then, of course, as well.
Mark Larson: So with that, I'll sort of summarize the results of these 2 sort of extensions. So
Mark Larson: we saw that we have good but likely still optimizable results for these 2 and visible decays here.
Mark Larson: But unless we were able to increase the signal yield here for each sample by up to a factor of 3,
Mark Larson: and we saw that if combining with the leptonic
Mark Larson: decay results that we would gain sensitivity to another signal point as well.
Mark Larson: And then we've also obtained again very preliminary results by adding the Z Tadronic decays to signal, and this could have the potential to increase the signal by up to a factor of 20. Here.
Mark Larson: however, this will really inevitably decrease with cuts that would properly reject the background.
Mark Larson: And so I'll say that likely some innovation will be necessary to determine how to better reject the background again before the displaced vertex card is done.
Mark Larson: so I guess any suggestions there would be greatly appreciated.
Mark Larson: And so.
Mark Larson: additionally, the the code for all of these analyses have been merged down to the Lp fork of the Fcc. Analysis repo as well.
Mark Larson: and I'll also mention that we could incorporate the other Higgs decay modes into the backgrounds eventually.
Mark Larson: So she's hits the glue glue, I think, would still
Mark Larson: be important to consider as a background.
Mark Larson: And I'll mention that's planned to make an Fcc. Notes about these results, and the previous idea versus sealed beam detector card comparison
Mark Larson: that we had previously presented here.
Mark Larson: And lastly, I'll just mention that this work will likely be taken up by another student in Louise's group, potentially starting. I think, this fall so
Mark Larson: hopefully, this is all to be continued and continue to be improved upon.
Mark Larson: And now that's all that I have.
Juliette Alimena: Okay, great thanks. So much
Juliette Alimena: questions.
Juliette Alimena: Okay, maybe I can start with with one on slide 11,
Juliette Alimena: the bottom half of the slide, I think in the end I wasn't exactly sure what you're doing. You say form displace. Vertixing is normal. Then remove all particles associated with those reconstructed, displaced vertices, and then with the remaining particles, you cluster the the jets, so would the jets, then be prompt.
Mark Larson: Yes, yeah. Th, these are ideally the jets from the Zdk, yep.
Juliette Alimena: Oh, duh, okay.
Juliette Alimena: Sorry. That makes sense.
Mark Larson: Yeah. Equals. 2. Here, yeah.
Juliette Alimena: Okay. Sorry.
Mark Larson: Yeah. But but possibly the issue is that there's more than 2 checks for many of the backgrounds. So.
Juliette Alimena: Yep.
Mark Larson: Yeah, I either you're combining them or ideally, just selecting 2 of
Mark Larson: of, however many there are. Yeah.
Juliette Alimena: Yeah, indeed. Which is why you want to.
Juliette Alimena: you know, reconstruct them properly, so you can separate. Use them as a discriminating, variable great
Juliette Alimena: other questions.
Juliette Alimena: Magda.
Magdalena Vande Voorde: Hello! Really cool work. It's super nice to see this 1st off. I also got a bit curious about what types of jet clouds during strategies that you tried like on this slide.
Magdalena Vande Voorde: and what was not satisfactory like, did you see a common trend of what was working and not working.
Mark Larson: Yeah. So in in general it seemed that.
Mark Larson: Well, well, first, st I should mention that I I was trying actually all of the different jet, clustering strategies that were available in the Fcc analysis, framework
Mark Larson: and varying parameters between the radius and whether or not using E 0 or momentum scheme.
Mark Larson: and ultimately.
Mark Larson: I I guess, based on the sort of decay link the scalars you'd expect to see between 2 to 6 jets.
Mark Larson: and in general you would see what was perhaps expected for the the more prompt signals.
Mark Larson: But then, for the more displaced signals you would see likely not as satisfactory results, I guess.
Mark Larson: but I think in the end, if if you did do this a bit more properly, and had a better way of validating
Mark Larson: rather than just looking at the number of jets that were reconstructed and and
Mark Larson: seeing based off your decay length. How many you would expect
Mark Larson: perhaps it could be done in the end, and and perhaps this would be a better way to do it, I guess, than this new strategy that we came up with.
Magdalena Vande Voorde: Yeah. Okay, interesting. Thank you. It's it's a very tricky signal, I guess. And we can also boost that. The case and some particles. Yeah, being formed as one. Yet
Magdalena Vande Voorde: I was also wondering another question, did you plot like any distributions of the backgrounds, like the distance between the primary vertex and the displaced vertices.
Mark Larson: No, I did not. But well, I I believe the plotting script that, I
Mark Larson: added, did do that
Mark Larson: But I didn't actually take any plots from that, because we have, however, many like 1010 backgrounds for the Adronic
Mark Larson: and
Mark Larson: 4 backgrounds for the other. So it was a bit crowded in the plots. But
Mark Larson: yeah, yeah, I could definitely do that. Then, if you're curious.
Magdalena Vande Voorde: Yeah, no. I'm wondering, because Axel has starting to do this a bit for our Leptonic case, for the background that he's studying, and he sees a bump
Magdalena Vande Voorde: at around 1,800 which is which is nothing we expect.
Magdalena Vande Voorde: So. But I guess we're using kind of the same background sample. So then we would have the same.
Mark Larson: Yeah.
Magdalena Vande Voorde: Distributions.
Magdalena Vande Voorde: and our current suspect to why this is happening is that there's some there's like a high sensitivity on the tracks.
Magdalena Vande Voorde: So something like this, but we haven't investigated it too much. But maybe we can keep in contact the 2 of you, or something so
Magdalena Vande Voorde: have the same strategy in your note, then, and for
Magdalena Vande Voorde: what he's doing in the future.
Mark Larson: Okay, yeah, that sounds good.
Mark Larson: Cool.
Juliette Alimena: Yeah, indeed, I feel like Mark is one of the ones who's been looking the most into like. Also the idea detector versus the Cld detector and understanding the structure of both of these and how it would affect displaced vertices. So
Juliette Alimena: yeah, I feel I feel like he's definitely the one to to keep in contact with on this.
Magdalena Vande Voorde: Yes, think I.
Juliette Alimena: Other questions for for mark
Juliette Alimena: I've got one. You you mentioned.
Juliette Alimena: Your next steps.
Juliette Alimena: But I'm i i still have more questions on on that. So do you sort of disappear soon, mark? And if so, to what are you moving on to? Again?
Mark Larson: So I'm I'm starting grad school now. In the fall. I'm starting a teaching program. I'm I'm actually starting to work on lops at the Muon Collider, now from the University.
Juliette Alimena: Cool.
Mark Larson: But yeah, so I I won't disappear. I'll I'll plan to keep kind of working on this Fcc. Node in the background
Mark Larson: over hopefully just the next
Mark Larson: few weeks or month, maybe depending on how long it takes to sort of formalize a lot of this stuff.
Juliette Alimena: Okay, that that'd be really great. I I was
Juliette Alimena: yeah, because especially if you submit an Fcc note, there might be comments on it. So I was wondering how the next sort of
Juliette Alimena: weeks or months would would work. But if you're still
Juliette Alimena: vaguely connected, then then I think it will be okay.
Juliette Alimena: But clearly not your main focus any longer. That's alright.
Juliette Alimena: Yep.
Juliette Alimena: okay, sweet and then.
Juliette Alimena: okay, I think I think that actually answers everything. I was gonna ask I I mean, and it would be great indeed if Louise gets another student on on this but I will wait to to see and hear, hear from Louise when she says she has one.
Juliette Alimena: Yep.
Louise Skinnari: Yeah, indeed. Just to confirm. I mean, that's that's very much the the the plan. But.
Louise Skinnari: Ab.
Louise Skinnari: it's a little. It's a little challenging for us with
Louise Skinnari: just kind of from the logistical perspective, because typically
Louise Skinnari: work has been largely done by undergraduate students. And so it's a question of finding the the appropriate student can work on something like that.
Juliette Alimena: Indeed, and they're often busy, you know, starting in September. So I understand, maybe you get an influx over the summer students. Yeah, cool.
Juliette Alimena: Great.
Juliette Alimena: Anything else?
Juliette Alimena: Well, okay, I'm not seeing anything. So thanks so much for for all the work, Mark, and for documenting it and providing the samples and the the code documentation as well. This is a a big help, and it it ensures that your work will, you know, live on and be be used by others as well.
Juliette Alimena: So that's that's excellent.
Mark Larson: Thank you all for all the help as well.
Juliette Alimena: Absolutely
Juliette Alimena: okay. So if there's nothing else on Mark's presentation, I don't have a next meeting of I mean this meeting lined up
Juliette Alimena: next week Ichep starts, and I I assume many people will be going on vacation. On the other hand, you you saw the dead September October deadline. So in in case anyone wants to present anything, just let me know as usual.
Juliette Alimena: But if I don't talk to you in the next weeks, and you go on vacation especially, have a good vacation and good summer.
Magdalena Vande Voorde: Thanks you too.
Susan Gascon-Shotkin: You very much. You.
Juliette Alimena: Thanks.
Juliette Alimena: I'm Buddy.
Magdalena Vande Voorde: Bye, bye.
Susan Gascon-Shotkin: Hi! Everyone.