Rajdeep: This meeting is being recorded.
Rajdeep: Okay, so um on behalf of the Atc physics for Organizing Committee. It's a pleasure to have uh Michael krone
Rajdeep: uh for right-handed W. Goes on, and a heavy neutrino with the Cms run to dataset
Rajdeep: um I um would do not want to uh
Rajdeep: uh tell you some of the interesting things you will see. But this channel and this measurement has been a matter of uh
Rajdeep: uh, a lot of discussion in the recent past, particularly what we might see in the near future. Uh. So Michael has played a leading role in this search, but Michael does a lot of other things as well with Hql. And
Rajdeep: and he will also be the from lab Junior distinguished researcher from the coming year.
Rajdeep: Uh, and he was very kind to accept this invitation when we shared an office in so on over summer.
Rajdeep: So thank you, Michael, for agreeing to give the talk, and without any further ado we can get going. So my
WH11NE- Sunrise: great thanks for the uh, uh, yeah, I guess we'll just jump right in this. Is this road you said uh
WH11NE- Sunrise: a presentation on the search. We did for right hand. W. Boson in a heavy uh neutrino.
WH11NE- Sunrise: So let me just start with very brief introduction here. Uh, I'm. Sure, we're all familiar with front of data at Tms is very successful data taking period for us. Lots of challenges arose, you know, multiple of those, uh, but we're able to plug this substantial dataset for physics, measurements and searches, so that's what I present in here is a search uh with this whole run to data set. So about one hundred and forty ingredients.
WH11NE- Sunrise: Uh, let me dive in, then, into the theory and motivations behind the search. Uh, by first introducing you to heavy neutrinos. So there are tumors, I would say theories and models that they, the neutrinos uh one of the big benefits of uh hebuttonos, is that they provide an explanation for the masses of the standard model through the seesaw mechanism.
WH11NE- Sunrise: Uh, in these, you know various models. They can either be my run up or direct neutrinos. Um
WH11NE- Sunrise: Some benefits for my run is, they allow l time, number, violation, and can help to explain the matter actually matter as an entry that we see in our universe. Um. As I mentioned, they appear in a large variety of models and signatures at the Lhc. So just few examples. They appear through a slice vertices. They can be produced through vector both on fusion.
WH11NE- Sunrise: We have type, one model type, three set up. We have compositive and neutrino models.
WH11NE- Sunrise: Um, So really, there's been a long history uh at the Lhc. For search for having neutrinos um and it. This, you know, extensive search program is currently ongoing at Cms, where we have numerous uh searches kind of in the works and in various States publication. Uh
WH11NE- Sunrise: all that is really outside the scope, and it's talked of. So I won't say any more other than you know, if you're interested, there's lots to discuss uh what I really want to focus on is just one specific model uh that predicts head of neutrinos. This is left right symmetric models.
WH11NE- Sunrise: Um, This is a pretty simplistic uh model, I would say, uh one of the benefits for it. Is it uh kind of explains the origin of parity violation that we currently observe uh, with the week interaction.
WH11NE- Sunrise: What what these models do is they extend the electro week sector of the standard model with an additional a group. So this s you two uh right and a group.
WH11NE- Sunrise: Um! And then what these models uh do is predict three uh right-handed gauge bosons with that you are plus minus the right end, W. And C. Prime, and then we also can have uh three additional right handed. If you So these are have neutrinos, a couple of those uh three button flavors. Um. And as I mentioned,
WH11NE- Sunrise: this is also a provide from that generation uh for center model. Um, So you can kind of get a sense to find the diagram up here uh for what uh kind of what we're looking for. Uh? So you can see we have a W right in w be produced uh the came into a left time, and it having
WH11NE- Sunrise: uh and then the uh the heavy it's back into a left time, and then off shell pregnant W, which in case two works. So our final day is going to be two laptops and two works.
WH11NE- Sunrise: Uh. So one question uh, can the uh have you introduced your be direct or my runa? Uh? Answers it'd be either depending on what kind of model we're looking at? Uh, I guess I should say this earlier, which the base uh so we're all on the same page. My run, of course, means when it's it's it's it's it's
WH11NE- Sunrise: Um! There are some differences, though, uh, I mean on whether these models uh or they direct or mayor. One is that in direct models uh, we only get opposite sign uh a lot of times, so you can kind of see how this decay will occur here, and how the love times then end up being opposite sign
WH11NE- Sunrise: uh, in the final state Uh, this can be compared to Myrana models which kind of allows both of these diagrams up here uh so predict both opposite time and same sign. Uh,
WH11NE- Sunrise: uh, one of the benefits of searching in this uh direction is that uh, we can then use the sign so specifically searching in the same sign region which I just see as I go from this talk uh the backgrounds are, but we look in the same time region we have essentially no backgrounds. So that's a great benefit of uh kind of searching specifically for my
WH11NE- Sunrise: um. And then another uh sort of thing that happens in these models is that we get same flavor dial up times uh when, uh we pretty, that there is no mixing between these settings, which just kind of for historical and simplistic site. This is what we do in these searches to keep the uh, the searches, most of.
WH11NE- Sunrise: Um.
WH11NE- Sunrise: So yeah, speaking of previous searches. Let me start by explaining what we have done in Xms in the past. So when we back to run one here, if you look at plot on the top of left we had a search and a Atv Uh. Which was a charge line analysis about the email channel.
WH11NE- Sunrise: Uh, specifically, what i'm joined. Here is the limit in the Ee Channel, where you can see that you can see it, You know, Credit to Tv. We get about the two point eight uh sigma uh access. So this was a pretty interesting uh coming out of run one and something that you know one through the skate right away going into and run two,
WH11NE- Sunrise: so because that we did a very quick uh two thousand and sixteen, and only analysis in round two uh where this analysis was pretty much a very similar strategy as what we're starting to run one
WH11NE- Sunrise: um, and unfortunately, what you can see in the middle Pl. There is the signal region in the die electron channel. Uh, and right away, You see, there was no access, observed my. My collection was that the that access was mostly in the office Charge Channel.
WH11NE- Sunrise: What's the twenty-six? This is uh doing also the covering the opera office. It's charge. No, They were also charge a line. Uh, but there have been like other offshoot analyses that I think uh for like composite models that specifically didn't look at the
WH11NE- Sunrise: But yeah, I uh, Yeah, I have a lot of this slides on kind of history of all that. But yeah, not not in my primers. So yeah,
WH11NE- Sunrise: Um:
WH11NE- Sunrise: So yeah, I guess. Yeah, uh the single region There, you see no access
WH11NE- Sunrise: uh in the far right plot uh what you can see is kind of their coverage. So their limits across their uh the entire Tv phase space that they search. So This is the phase space of the uh, the right-handed map w uh sorry mass of the right hand W. On the x-axis and the heavy neutrino mass on the Y. So this is kind of like how we present our limits in these searches. Uh, the one thing I just want to highlight here is that this search uh the way up set up it did not do a very good job of searching specifically down here
WH11NE- Sunrise: in this sort of region where the heavy That's right, and W. Max is much heavier than having you train on that. So that's just kind of a look ahead at what we will be focusing on in our uh version of the search.
WH11NE- Sunrise: So let me Yeah. Go right then into the search strategy uh. So what we wanted to do for the full run to analysis is one in twelve. So uh approach, for there two thousand and sixteen. We're calling it the resolve analysis. Uh, we did make some iron tweaks to rooted, but the main uh improvement you wanted to make is, we wanted to add this new search region where we look for boosted have neutrinos uh, so you can find a diagram here. You can see This will clearly occur when the uh the right hand W.
WH11NE- Sunrise: Uh. As a high maps it produces heavy neutrino that has a much lower mass, so it's going to be produced with lots of momentum. All three of its decay products can be collinated, and we can uh reconstruct them in a large con size. Ch: So we get two ports and a lot of time in this uh jet.
WH11NE- Sunrise: Uh, we also have the original left time, which is going to be produce, you know, properly back to back to the heavenly tree number.
WH11NE- Sunrise: Um. And yeah, And that allows us to search for signal in this die object uh interior and mass spectrum. So the the object is the whole of time in the uh,
WH11NE- Sunrise: uh, and similar to what we've done in two thousand and sixteen. We prefer uh form search in both. Dial up from that you on Champs.
WH11NE- Sunrise: So one aspect I just want to. Oh, sorry, no! Let me give a little more details of the analysis. Uh before diving into more details. Uh,
WH11NE- Sunrise: in all of our search Here we have highly energetic laptops, or ipt ones. So we've single up time triggers uh for all searches uh for our resolved search. We have four isolated objects, so either two electrons or two nuance,
WH11NE- Sunrise: and then two, eighty, four jets. Uh. Not only are these both isolated, but they're also well isolated from each other, so we require that each pair uh have a double on group and zero point, four from each other, and then we again, similar to two thousand and sixteen search for signal, and the four object and very mass uh spectrum.
WH11NE- Sunrise: I kind of already, explained boosted. One isolate love time one eightkjet
WH11NE- Sunrise: die object here in mass uh spectrum six signal, and we of course, kept these two regions of them for final. So you can. Yeah. Do you not consider like a semi- resolve semi boosted, or just the two courts from the Wr marriage, but the left one is separate, or is that like a very small part of face space? And we didn't uh specifically uh look into it when we uh also have the limits at the end, it can kind of see there is a little dip where the uh,
WH11NE- Sunrise: where that could have, you know. Push the woman out of it further. If you had done that. But uh,
WH11NE- Sunrise: yeah, we didn't uh we didn't have It's a small part. But yeah, yeah, no, that is good point, right? Maybe a pull up to that. So when you say heavy nutrino, you're thinking of a hundred Tv or more or some not not two or five Tv.
WH11NE- Sunrise: Yes, yes, it is yeah, Sorry if it's sensitive to. But still it's the right thing. Yeah, we uh, I mean, I know, in our simulation we simply start generating objects at uh
WH11NE- Sunrise: for samples that had on
WH11NE- Sunrise: um. So yeah. So then, as I was saying, okay uh one of the highlights I wanted to bring up for this search is that we designed a new jet tiger to kind of tag or uh distinguish these uh neutrino jets from background jets.
WH11NE- Sunrise: Um! So what this check tigers call this the left on subject fraction uh the way that it works is, you take an akjet and you cluster it into n subjects um, using specifically this exclusive Kt: algorithm And the way this works to rewind the part time shower
WH11NE- Sunrise: uh back to the hardest splitting so specifically for us uh the what we did is we uh
WH11NE- Sunrise: Cluster d engage in three subjects, because we expect there to be, of course, three uh objects uh, and it distinct objects in our jet full of time. Two quarks um! And then when we kind of do this uh plus three of the exclusive Kg: algorithm we find that the left time uh since it's, you know, originating from essentially the primary vertex. Uh, it's, you know, very hard process it's going to uh, essentially be the only object in its subject, and really dominate uh its subject.
WH11NE- Sunrise: So, of course, that means that we would have uh then to find the Ls. That's right. We would define the Ls score as the teaching pt. Of the left time divided by the Pt. Of the subject. That is the part of.
WH11NE- Sunrise: So that means for signal. We have, uh, of course, left time and uh, Ls scores where the Pt. Of the left time is downloading subject, so they're going to be very, very close to one
WH11NE- Sunrise: Um. And in background. Uh so, for example, in top events uh where you know what time is coming from. A Pdk: Uh. It's much softer coming from secondary vertex, so it doesn't uh dominate It's a subject much. It has much lower Ls scores. But very are your question. Yeah. Why don't you swap those back back there? So you have a a hard left on the the W from the top,
WH11NE- Sunrise: and just some credit to us coming off the the you also have to magic.
WH11NE- Sunrise: So that's like a our main background. Yeah, yeah. So that uh, that's gonna come in. Yeah, Yeah, We uh I mean, just pretty good. Essentially. Yeah.
WH11NE- Sunrise: But yeah, you're assuming the heavy neutrino case promptly right? It's weekly interacting, right? So it would get likely to have a longer lifetime
WH11NE- Sunrise: Uh, that will be uh heavy. But that is the type of model. Answer that, you know, does it?
WH11NE- Sunrise: The company would be very small that you would not try to see that, because, you know you'll have to, you know, if you by initial state and the left on first, you know, final state, so we can run it backwards, and the in case it is.
WH11NE- Sunrise: So I think uh the search you are talking about the
WH11NE- Sunrise: Yeah, I think you're right. Yeah, Yeah. Because yeah, specifically for ours, we assume a couple of W. Right is the same as the uh W left company just to
WH11NE- Sunrise: I see.
WH11NE- Sunrise: Um.
WH11NE- Sunrise: So yeah, hopefully, that kind of extends also up as a a tagging variable uh Tv sense of what
WH11NE- Sunrise: looks like here. Uh, this is a look in um kind of a single region, but without the else I've got to apply uh Byelectron channel on the left, I you on on the right uh
WH11NE- Sunrise: what i'm point out here with the red dash line, and the arrow is. That's where our couple of applied. So yeah, but also, if it is greater than zero point, seven, five
WH11NE- Sunrise: uh what you'll notice is single peaks at one. It's a little hard to tell, but they're the dashed lines in there. Um! So that's performing as expected, and you can see we do have background you can at one, but we also have a substantial amount, uh, you know, with the Ls score less than zero point seven, five um, and
WH11NE- Sunrise: but I really want to highlight it about this and the big benefit that this brought is You'll notice that the non prompt backgrounds always are mainly have lower scores. What I mean by nonprofit is uh events that have non prompt left times in them. So, for example, W. Plus Jeff uh is one of them when the jet is coming the jet uh there's a long time in the jet that's coming from like a kt or something uh something not wrong.
WH11NE- Sunrise: Um! And this is what's a big benefit for us, because these are uh backgrounds that are really hard for us to uh predict and model. So we really wanted to, uh, you know, get rid of as much of it as possible. So this was integrated.
WH11NE- Sunrise: Uh: so yeah, So just to give a little bit more details about the event selection here.
I've already said a lot of this.
WH11NE- Sunrise: We have the four resolved objects. You can see the Pt. Pretty high. Pt. Cuts two a day, four jets on uh. Then, if we do have a resolve event, we then further require that the dial up time at the Marian mass be greater than four hundred Gd. This put us way past the Zp. Um. We also have an invariant Max on the four objects.
WH11NE- Sunrise: Uh, then, for the boosted
WH11NE- Sunrise: very similar to resolve the other. The one thing to point out is that we do have a delta ipad between the that first kind of an isolated lifetime. Call the tight lifetime um and the ahf, and then we also have uh the invariant mass. Here is that two hundred G. Because we found we didn't to be as strong as in the result.
WH11NE- Sunrise: So let me now get into our background Estimation
WH11NE- Sunrise: uh we were, you know,
WH11NE- Sunrise: Pretty naturally. I guess they're easily able to divide our face space into the three regions that you'll see. Here. We have our signal region, which pretty much just defined, and then we have two control regions, so we have our flavor control region, which is the same as our signal region, except we uh require the or or different.
WH11NE- Sunrise: Um! This is, of course, used to help to estimate our uh uh Tty Bar background, and then we also have a dwelling in control region, which again pretty much the same as I've seen my region, except we shift the dial up time as well, so that we're right on top of the Cp.
WH11NE- Sunrise: Again. This is to uh um uh estimate our uh in background. I should mention here, I guess, that all of our backgrounds are coming from simulation.
WH11NE- Sunrise: Uh, We, of course, have the two control regions where i'll explain more detail how we corrected the simulation, for in these control reasons, uh, and then we had very minor, so like five percent on the order uh contributions from uh other backgrounds. So that goes on tri bos on single top tt and wi-f, if we just take straight from simulation. Well, why don't you put the on Controller right next to this?
WH11NE- Sunrise: Uh we as well?
WH11NE- Sunrise: One is we wanted to be a little space, so avoiding sort of like migration between the two. Uh, but the big one uh which I actually don't really talk about here is we use that as a bit of a validation region to show that the corrections we were applying, or that we were taking from our trillion control region, we're applicable to higher dial time variant mass. So we'd look to connect to kind of validated
WH11NE- Sunrise: um.
WH11NE- Sunrise: So yeah, let me start by talking about what we did for a trillion uh estimation. Uh, of course, we have events from Charlie, and because when we go in the high mass tail, the trillion distribution, plus a couple of just from a new State radiation. This will come into our signal region.
WH11NE- Sunrise: Uh, if I haven't made clear trillion and t bar too many uh backgrounds uh, and they uh are both equal, I would say about
WH11NE- Sunrise: um.
WH11NE- Sunrise: So we then have to apply corrections to our
WH11NE- Sunrise: Carlos. Uh. The first question we applied was a Qcd correction. Uh. This was because we really need using the leading order sample in um. So we from Uh and Monte Carlo just taking the ratio of the next meeting order over the leading order sample uh, then in the Z boson uh
WH11NE- Sunrise: kind of follow the recommendation from theory paper here to do that.
WH11NE- Sunrise: Uh we then uh took uh another direction from the same. Uh, this is a an electro-week correction with your place. It's really on Monte Carlo. Um! This is, you see, it's a combination of a couple of different order uh electro week uh super cost logarithms in the next meeting log approximation.
WH11NE- Sunrise: Um. Yep. So we applied this, and then,
WH11NE- Sunrise: uh, I don't have any plots because they weren't made public. But we looked into our, you know. Look at all the kinematic variables, the Z side of everything look perfect. What time? Pt. Spectrum Everything matched Well, I've refined this previous two corrections. However, when we looked on the check side of the event.
WH11NE- Sunrise: We saw discrepancies uh, between data and Monte Carlo. Uh, specifically into two Pt. Uh the two jet. So the leading in the of the distributions. Uh, we believe this is because, uh, we were uh restricted to only we using the leading order uh simulation.
WH11NE- Sunrise: Um. So because of this we essentially just uh thrived uh, uh, we're waiting correction uh in the driving control region, essentially forcing the jet. Pt: the lead jet pt spectra to match. Uh, this did
WH11NE- Sunrise: uh, actually also correct the saw meeting uh Jft spectrum as well. So everything looked like it matched pretty well after uh applying this correction, and you can see here is the invariant mass spectrum. So the four object
WH11NE- Sunrise: for the resolved is on the top e on the left. You me on the right, and then boosted, you can see the die object uh in your in mass spectrum here.
WH11NE- Sunrise: Uh, or you can see that there is pretty good agreement in the uh control region. Uh, I suppose I should mention here that we do perform a sign on any spit at the end, with all our barter regions. So we're able to extract um the normalization correction to in Monte Carlo.
WH11NE- Sunrise: Yeah. So a bit puzzled by this top bin, where you have one hundred events in that bin. But the bin is uh three Tv up to G, I guess So when you put it in the five and a half Tv is at the two. I I would have thought you could divide that
WH11NE- Sunrise: one been into three of all things uh
WH11NE- Sunrise: because statistics I mean, It's not single event. Right? You're right. But the so a few caveats, the uh events are all clustered on the low end so we could. We could divide it. I agree into probably two or three uh event, or it's our ends.
WH11NE- Sunrise: Uh. But where we ran into an issue is one of the bidding here to match the in our signal region
WH11NE- Sunrise: and the the statistics in our Monte Carlo samples completely wrapped in our signal region. So this was a that was what was driving the mid size. Here we we could only have one ben in our signal. So it's it's it's it's not the average of
WH11NE- Sunrise: I Yeah, I agree with that. One way around this issue, of course, is to plot the integral distribution, the number of events above a certain certain threshold, and then that that shows every event where they are, and it's it's not a
WH11NE- Sunrise: common plug, but it shows more information than than this one which doesn't tell us much about the high mass region.
WH11NE- Sunrise: Um, But yeah, uh, hopefully, it's clear why we uh They've been there. Because yeah, that's a uh an unfortunate aspect of this, but something that we couldn't get around based on the the mine. Carl: We had.
WH11NE- Sunrise: Um.
WH11NE- Sunrise: So yeah, I guess you can kind of see your the data in my Carlo agreement. Uh, It's pretty good after you know all these corrections that We' there is this one, Then that seems to be, you know it's not quite within uncertainties, but it's pretty close, so you know.
WH11NE- Sunrise: Uh we'll we'll get back to again. But uh, it seems like we didn't Okay, job of correcting it. Uh, based on the control region.
WH11NE- Sunrise: The Tg. Bar background which we get from the flavor control region is much simpler. Uh for this one uh, we just, you know, defined uh this, you know, opposite flavor uh l time region, uh which has the same kinematics or Sigma region, and found that we had very good agreement between data and Monte Carlo and all our distributions. Uh, so really, all we did was uh provide a normalization correction factor for our Tt Bar simulation here. Uh in our simultaneous fit, and you can see we have our three different control uh regions resolved
WH11NE- Sunrise: on the left, and then we have two different boosted ones. So one where the electron is in the jet and one more than you on the jet.
WH11NE- Sunrise: So yeah, let me then get into our uh results. Uh. So to get our limits, we performed the unlikely to fit in our uh four different invariant mass distributions here uh to scratch. You know the limits.
WH11NE- Sunrise: Uh you can see uh on the top. Here we have our resolved signal regions, electrons on the left, you on the right as always, we sit on the bottom. Um,
WH11NE- Sunrise: you can see. I guess the one thing to point out that way is because our scenes are in that in the highest invariant mass uh bin, which, of course, is going to be one that uh drives our sensitivity here.
WH11NE- Sunrise: So uh, So yeah, So that was interesting. Uh, we spent a lot of time investigating that. And what could be going on uh you can see in the rest of the distributions. There's not really uh any access. Maybe we got a little bit. It's uh it's within an uncertainty, as though so not quite a sigma.
WH11NE- Sunrise: Um. But yeah. So For the most part everything kind of agrees with our background destination. Uh, except for kind of
WH11NE- Sunrise: the the highest in in our uh uh die electron.
WH11NE- Sunrise: So how does uh, just to show it? Uh, here is a little fall out of uncertainties. I really just wanted to highlight uh kind of big ones that we had in the search which are coming from some of those corrections that I described to our Uh Monte Carlo. So the first one is to the Pt. Uh. Of the C. Correction. One of the first ones. I explain.
WH11NE- Sunrise: That's the second largest uh uncertainty that we have in the biggest one was the Australian already shaking of the jackpot spectrum that caused our large uncertainty. Uh: So yeah, as i'll explain later, that's something we really want to work on going forward. Uh,
WH11NE- Sunrise: But yeah, Here, then, is a look at our one-dimensional limits. Um! So what what masses that i'm showing here uh on the top? It's the mass, where the heavy neutrino is equal to one half the mass of the right hand. W. This is essentially directly in our resolved topology, so you can see, Think of those as our resolve limits, and on the bottom. This is when the heavy neutrino has a mass of point to Tv. So that's it. Right now to regions. So those are essentially our most limits.
WH11NE- Sunrise: Um! So you can see, uh, that access that we saw in that height, and that's been shows up here where you can see, you know kind of right around the two signal line. Uh is where our observed uh
WH11NE- Sunrise: is a a limit in sliding
WH11NE- Sunrise: uh when we calculated uh p values for all of our uh signal points, and found that the highest significance was when the right-handed W. Mask had a mass to press our six Tv and the pediatrino had a point eight Tv. Uh. It gave us a lot of significance. Two point nine, five sigma and a global two point seven, eight
WH11NE- Sunrise: uh, just to mention why uh, this Ma's point in particular. It's because this is actually something that you brought up. This is uh, one of the mass points that lines pretty much directly on the uh the middle. So it lands. Uh. It has significant signal efficiency to uh both the resolved and the and you can see them boosted here. We actually are kind of seeing about, you know,
WH11NE- Sunrise: somewhere around the one Sigma. So the combination of that one that you see about is really what uh kind of pushes uh this one to be the most any uh information uh the charge of the
WH11NE- Sunrise: We did not. Now we didn't get a chance to do that for description of the analysis. Unfortunately,
WH11NE- Sunrise: I think, though,
WH11NE- Sunrise: are your cuts
WH11NE- Sunrise: leaving uh plus minus, and the same sign uh, you know, equal amounts, or the uh
WH11NE- Sunrise: doing something about that, I mean. In other words, if you had an access that same on your opposite side. Would that show it? Would the way it would be diluted here. Um.
WH11NE- Sunrise: So it would show.
WH11NE- Sunrise: Yeah, it would show it. It was the opposite side. Uh since we're being completely charged blind our but shouldn't uh
WH11NE- Sunrise: I mean, I guess we never actually looked at what data we ended up with, and like how the charges landed. Uh, but we shouldn't theory, I mean it should be roughly fifty, fifty uh in theory, but we never did look at that.
WH11NE- Sunrise: And one other thing. You I think this uh sixty the point uh
WH11NE- Sunrise: it's not highly,
WH11NE- Sunrise: I guess. The four or five evening Is that sorry for? Let's say seven. Is that true? Or only slightly? But yes, it you mean, like the highest access, right? That point that you mentioned there is that all these slightly different hours, if you showed us a P. Value
WH11NE- Sunrise: uh the plot is a function of the W. Mass.
WH11NE- Sunrise: Would that be shallow.
WH11NE- Sunrise: Yeah, Yeah, it's a yeah. There isn't much difference with this is the one that gets the the lowest P value or the highest significance. Yeah,
WH11NE- Sunrise: I think it's going back to my idea Question. I mean, um. Your limit uh is smooth. It's a very smooth distribution. All we have to six Tv. But this the events are cl and not,
WH11NE- Sunrise: and then you have clusters of events, right? The the ones above three, or whatever your top minutes that that they're scattered right? So I would expect the experimental to to have wikiped and bumps in. Yeah, Yeah, you're right. I mean,
WH11NE- Sunrise: we we we essentially just did a cut account experiment in that last been um, just because we I I mean, we just didn't have the statistics to kind of map it out as you're suggesting, uh for our background.
WH11NE- Sunrise: So I would like actually to see this events in the top. Been about three to one hundred events there, and maybe they're all that you know, between four and four point two, as far as I can see from that I mean so
WH11NE- Sunrise: it's somehow. You're throwing away information by now.
WH11NE- Sunrise: Yes, I agree. This is um.
WH11NE- Sunrise: We spent a lot of time trying to fit our distributions, but found that uh, just because we didn't have no statistics to do it really. Uh, you know, certainties on the bits washed out any sensitivity we gained. So unfortunately this is what we went with. Uh, but But I I totally agree with what you're saying.
WH11NE- Sunrise: Yeah. So so how does the signal shape look like we saw big like wide residents uh they're not, you know the more narrower resonances I mean kind of in our
WH11NE- Sunrise: I mean in our bid, and you won't be able to see it. Uh,
WH11NE- Sunrise: unfortunately, like we've only bought it on here our uh uh the single one that gave us the uh um
WH11NE- Sunrise: high significance uh, but the other single points, I mean. They roughly had residences that would fit with that bins before that. So that was kind of what we were going for.
WH11NE- Sunrise: Um,
WH11NE- Sunrise: Yeah.
WH11NE- Sunrise: So yeah. So what do I see that there are a hundred events because it's It's like fifteen to me or so twenty. So on the top left the plot there about.
WH11NE- Sunrise: Yeah, it was in the control region. Yeah, yeah, you're right. There's about. Yeah. So so that's where the access comes from. Fifteen events for a big on their feet. So
WH11NE- Sunrise: uh, I had a question. Oh, yeah, the uh, The flavors so like in these models when you expect equal amounts of electron in your own or they. It could be that you only get electrons depending on whatever the flavor and they have You neutrino is, or something like that. I think uh it. It kind of depends on model. Uh, we just really keep it. General. Uh is my understanding. Uh, just to keep the search. Simple, I don't know if you think you want to do it more so like in these models, would you expect that you'd only get one flavor that?
WH11NE- Sunrise: Yeah, you You can have more than one, but it's unlikely to be uh as many of different flavor as same flavor, because you have to work out the
WH11NE- Sunrise: so there's something. So would you explain if we have any trainers to have all about the same pass or very different matches, So there's no no reason why they would be the same.
WH11NE- Sunrise: And uh, it's easy to write models where there is also be no flavor, a different flavor. It's just for the that phone number to be conserved per generation. But that's also not for
WH11NE- Sunrise: so then, when you do the fit, you're fitting like the dive, the electron and your channels like entirely separately. You're not where you have treated us. This is separate. It's the boost and resolve that we're buying. But the two channels are right. Yeah,
WH11NE- Sunrise: Uh: So yeah,
WH11NE- Sunrise: I guess kind of just our final plots here are too much limits uh across our whole phase space. Uh, there is a lot going on here. So let me just kind of walk you through what you're looking at. Uh, pink is the previous Cms. Result. So the two thousand and sixteen only. We then have our observed limits uh in black, uh which
WH11NE- Sunrise: here that's our combined result. Uh, and then this kind of lines on top. But we also have our resolved in this kind of bright green, which you know follows the combined, and then we have blue, which is our boosted. Uh. So yeah, you can kind of see. There is a bit of a dip here where
WH11NE- Sunrise: we could have targeted, but it's a it's a really small uh region. It's a bit more pronounced over here. Uh: but yeah, yeah, it's still pretty small. Um. So the highlights uh in the result we pushed out the uh excerpt limits on the Wr. Mass. Uh by a few hundred Gv. Um there to point sixteen uh limit,
WH11NE- Sunrise: and we had very significant uh improvements, uh, you know, going from here all the way up to there. Uh in the Channel. Uh, also to know these were. These are the highest kind of excluded uh wr masses uh today uh for these upright symmetric models. Um,
WH11NE- Sunrise: but
WH11NE- Sunrise: I guess so sometime. So I wanted to just quickly show you uh kind of what else has been going on in the Lhc. Since we go to and access, so we can kind of see what uh other uh searches have been doing
WH11NE- Sunrise: uh the first one. Here is applets uh they form a resolve only analysis in two thousand and fifteen and two thousand and sixteen data uh for this one. They did look um at the charge, so they kept uh the same time, and the opposite sign
WH11NE- Sunrise: Um! And for them they had no uh significant excess seen. However, they did see uh two sigma vocal significance in their uh electron uh channel, and by one Sigma global uh, you can sort this one of their signal regions Here you can see it starting to
WH11NE- Sunrise: come from uh out here in this prediction. Um. So kind of interesting that it is coming from, You know somewhat similar region that we saw, but not aing pnexes. Uh, then we also have Atlas having boosted uh a who's it? Announces for this one. They did it on everything except for two thousand and eighteen data.
WH11NE- Sunrise: Uh, for this one difference is, they performed a background fit uh to their background if it's better than needed. Um! And then uh, they did see. Uh, I would say a non significant access again
WH11NE- Sunrise: uh, to get this or to show what this is, uh, they took their single region and just kind of integrated the number of events that they saw. Uh, above the invariant mass of uh two Tv, and you can see uh the events they uh saw here. So their expected background was uh two point eight, and the observed, so that gave them uh two point four sigma uh access again. This is in the electron channel. Uh
WH11NE- Sunrise: which interesting, I suppose. Um. And then
WH11NE- Sunrise: Cms has a compliments, Terry. Search that uh the passes Public uh paper is not out yet, but hopefully it's out soon. Um! This is also searching for a lot for extra model, but in a bit more of a complicated diagram than what we're doing. So they're looking for z prime going to two hundred neutrinos, and then kind of neutrinos that the same way that they did for us. Uh, so really their final state is the same as what our search was, except they have an additional offshell W. Our, with two works coming from it.
WH11NE- Sunrise: Um,
WH11NE- Sunrise: just like us. They perform their search in both resolved and boosted in between our regions. Um, again, no significant access. Uh, but in their boosted uh electron channel
WH11NE- Sunrise: I do see a bit of an access showing up in there uh
WH11NE- Sunrise: highest uh invariant aspect which You can then see in their one dimensional limit plot coming up here, you know. Kind of right around the two Sigma uh limit again, or
WH11NE- Sunrise: what's what's the overlap between their single region of yours. That's how many of those events are the same. That's a very good question, I think. Uh, that's under study by that at the moment. Yeah. But yeah, yeah, yeah, very uh, hopefully, we get more details from. They've been quiet for a while now. So hopefully we get something. Um.
WH11NE- Sunrise: So yeah, that's uh kind of the uh. That's all for run to. Uh, I guess. Just let me very quickly show you our plans or ten, or whatever kind of our plans for run three uh since run three first year day taking is uh
WH11NE- Sunrise: uh almost done uh the first one is something I've kind of been mentioned plot here our drillion estimation one to improve upon this. Uh, since, as I pointed out, it get some pretty big uncertainties on it. So we kind of view this as the because of our front two analysis
WH11NE- Sunrise: uh, we're currently performance and generator studies to try to see if we can uh improve on the modeling, or uh also kind of dive into it. Uh. One of the aspects that we're looking into is that when we're in our dwelling control region. Uh, you know, since we're constraining that the invariant massive laptop in the Cp. But we works have this big spectrum that we're looking at, You know. A lot of this is going to be where the jets are dominating uh this collision, which is going to be quite different from what we have in our signal region,
WH11NE- Sunrise: where the uh we're on like, you know, the tail of the dial up on distribution, or sorry to die for the end distribution. So a lot of the mass is coming from a lot of times, and those are really uh kind of dominating the process. So it's kind of uh we're a little concerned that there might be some different kinematics there. Uh, and we're uh yeah kind of investing in that. That's something. We're very curious about. But then, as I mentioned the jetpt spectrums look by different. So we're also kind of looking to if we can tweet some matching scales to make that better,
WH11NE- Sunrise: that you
WH11NE- Sunrise: two other handles, which I think we've kind of an Internet here as well, that we want to use and run three. Uh we want to use the heavy tutrino mass, which I mean. You have all three objects from it, so as long as we, it's probably like lepon that goes from the head. You can use that as a handle. Um. And we also want to incorporate the signs of the laptop, so we can look at the same slime region
WH11NE- Sunrise: uh so few more details on that we've already started working on the
WH11NE- Sunrise: uh. We uh have investigated, or what we have done, so far as we are designing a neural network to perform this kind of classification, of which of which comes from the neutrino uh, we see some pretty good performance. So uh, hopefully, uh, we keep pushing that forward. And then we also want to look into performing this Um,
WH11NE- Sunrise: The two d uh space is gonna be hard to do uh since we ran out of statistics and Wendy space. But hopefully uh we get more uh they can run three uh we're really gonna push for that a lot. So hopefully that goes well. And then
WH11NE- Sunrise: finally, uh a lot time charge! As I mentioned, this comes with uh the challenge, though. Uh, we have to get the charge flip systematic, uh for hypert you on, which is going to be very hard to measure uh kind of our plan, or what we started to investigate is, we want to perform this measurement and teach our events to it flavor. So we have new up Tran side. You know the charge, Flip isn't pretty well known uh, but the hard part, that is, when we look at the new on,
WH11NE- Sunrise: if the uh the charge has been mis measured, and it's quite likely that Pg. Has also been this measured. We want to characterize this as function of Pt. So this becomes, you know, a messy measurement to make. Uh, we're designing a neural network where we can take, You know all the event formatics of the Tt Bar to try to predict
WH11NE- Sunrise: you on Vt. Uh to try and correct it. Uh, but it's a tricky game, so that's something that also is a work in progress.
WH11NE- Sunrise: So yeah uh that to me did summary kind of showed you uh the search that we performed uh had a somewhat uh intriguing access of two months to make uh significance for global significant.
WH11NE- Sunrise: Um, I highlighted uh the other searches that were very similar to run to, uh, no significant accesses. Uh, and Maybe i'm just biased because I've been working on this for a long time. But uh, they do seem to be somewhat similar to what we're saying, but you know, Not significant. I would say so. Don't get too excited. But,
WH11NE- Sunrise: uh, I guess pay attention to what happens to run three, because, uh, we'll see. It seems intriguing. And yeah, we're already working on the run for analysis. So uh, hopefully, we have some early results. I'm not.
WH11NE- Sunrise: Uh, that's it. Thanks.
WH11NE- Sunrise: And Charles is very hot. But you has anybody seen this trying to do this with tales there has been? I really has been one in the past. I don't think we have. We have the run. The full run to has not been time yet. I know that, but it has been done in the past. I can't remember if it was a run one over. It was a two thousand and sixteen only. Uh
WH11NE- Sunrise: so yeah, then broken. I suppose it's conceivable, but the heavy nut in the tower, and it's a nice one. I mean the cottage to find absolutely. Yeah. Could you interpret your results
WH11NE- Sunrise: in terms of towers? Because sometimes
WH11NE- Sunrise: we could. But I would imagine, uh, the signal kind of efficiency would be so, you know, I mean, whatever the but does a model like
WH11NE- Sunrise: assume like Toll and me on your phone call, please.
WH11NE- Sunrise: But uh, but yeah, I think they can kind of. I mean, they can be the same. I think they can vary it. Just It's uh It's something that you can go by the way it's a model.
Rajdeep: Yeah. Firstly, Michael, uh thanks for going through this analysis in such a detail. Uh, my question is, if you could go back to your systematic slide. Uh, I didn't uh follow it in a uh too much detail. Um, but um, it's
Rajdeep: um.
Rajdeep: How much of the uncertainty due to the electron scale correction, or rather the uncertainty of the electron scale correction contributes to your a systematic uncertainty.
WH11NE- Sunrise: Yeah. So that's in the fourth row, I guess that.
Rajdeep: Uh,
WH11NE- Sunrise: uh, I mean, so it's It's a on the order of a few, I would say,
Rajdeep: uh so. Yeah, it's uh. So what what I meant is um. So uh, as you know. Um uh above approximately three hundred uh Gv. Electrons uh, which presumably all your signal is from
Rajdeep: uh. We reconstruct that in the highest uh electronic skin of the and we haven't paid as much attention to correcting those as we should. Uh. So if I refuse the question uh, suppose we um
Rajdeep: uh suppose this uncertainty just on electron, the the scale correction of electrons about three hundred Tv. We could have that uncertainty. Uh, would your significance, uh, with your signal sensitivity improve significantly?
WH11NE- Sunrise: Uh it, I would say, not significantly, just because of how dominant uh kind of the uh uncertainties were. Um, although I mean, yeah, the electron money is gonna affect all of the backgrounds, and not just the
WH11NE- Sunrise: uh. So it I wanted to, you know, crunch the numbers, but I it it would help that's for sure. I I don't know if it's significant or not. Uh on that.
Rajdeep: Um,
Rajdeep: so I I can't uh see this, and I do this.
WH11NE- Sunrise: It is very long.
WH11NE- Sunrise: I think you. Your connection is not good.
Okay.
Rajdeep: So it's possible. Yeah. Yeah.
Rajdeep: So maybe I can ask Michael Offline. Yeah, It's okay. Thanks for the on tonight.
WH11NE- Sunrise: Okay, Steve.
Stephen Mrenna: Hi! Uh, Thank you. Thank you for the very nice talk um following up on on Kevin's question. Uh what have you done to make your results available to phenomenology community, so they can answer questions like Kevin raised.
WH11NE- Sunrise: Uh, we do have a a have data entry uh where we we did take it very seriously. So I think we have everything there to uh reproduce our expected limits. Uh, and like all the the the samples, the single samples that we use all the generator stuff is there as well.
WH11NE- Sunrise: Uh, I I think we're pretty confident in our but of course, if there's things people want from us, or if it looks like it's a complete Please contact us. We're happy to, uh, improve on on it,
Stephen Mrenna: but not a ribbon analysis, and not not on both right,
WH11NE- Sunrise: not publicly. I think we.
WH11NE- Sunrise: We had it because one of the analyses, one of the people on this analysis is very into, and all of that. So I know he was uh working with our stuff in it. But I don't think we ever made it completely public uh just on have data.
WH11NE- Sunrise: What the status of the pay back?
WH11NE- Sunrise: Oh, it's this topic. Yes, Is it published already?
WH11NE- Sunrise: Yeah. Uh, yeah, I guess I could.
WH11NE- Sunrise: Um. It is the matching corrections uh of the W. To that. It's uh fixed by these models as well.
WH11NE- Sunrise: So I want to get the
WH11NE- Sunrise: are competitive at all, but especially at sixty
WH11NE- Sunrise: uh. So the W. Are decaying to. I think we just assume the same as the uh kind of left handed. Uh: okay,
WH11NE- Sunrise: yeah.
WH11NE- Sunrise: So
WH11NE- Sunrise: these kind of things are usually competition with each other. So it's a good question, but it doesn't mean the is not always what I mean for
WH11NE- Sunrise: right. If you, if you were to change the W. Our company, Yeah,
WH11NE- Sunrise: which one security's more would also change.
WH11NE- Sunrise: Also there is A. C nine top for bottom resonance. It is worth a lot for it,
WH11NE- Sunrise: but it's up on the
WH11NE- Sunrise: I actually have a question on the
WH11NE- Sunrise: the charge.
WH11NE- Sunrise: The charge.
WH11NE- Sunrise: So you tell me that one of the issues is that you on Pt: It's It's a lot of
WH11NE- Sunrise: Can you quantify that effect using like target probe in a set of like kinematically similar. That's maybe Tt. Bar all the the branch of fractures in the create. But
WH11NE- Sunrise: and then you don't understand? Okay, if it depends on something else to the event like taking the jet pt the number of jet,
WH11NE- Sunrise: and then use that to
WH11NE- Sunrise: you, Don't. Have some kind of understanding of
WH11NE- Sunrise: what the bt should be in the other ones
WH11NE- Sunrise: uh interesting. So you're saying in cases where you know, like what the charge should be right? Yeah, like, if it's Tv bar, you know, it should be
WH11NE- Sunrise: uh plus a mic. But then you get two pluses or something. Yeah, yeah, yeah, uh, interesting.
WH11NE- Sunrise: Uh: as soon as we stay we haven't specifically looked at that yet. But uh, that's an interesting idea.
WH11NE- Sunrise: I think a lot of people see us once again. This is the location for the teach at all, and it's,
WH11NE- Sunrise: and then they didn't. They didn't have a
WH11NE- Sunrise: If there is no more.