WEBVTT 1 00:00:00.630 --> 00:00:01.380 Matthew Bellis: Now record. 2 00:00:02.070 --> 00:00:04.440 Julie Hogan: cool Okay, let me get all my zoom. 3 00:00:04.440 --> 00:00:05.609 Julie Hogan: windows, where I want them. 4 00:00:06.930 --> 00:00:16.139 Julie Hogan: We are going to head back now into the basic objects physics lesson, excuse me basic physics objects lesson. 5 00:00:16.680 --> 00:00:25.140 Julie Hogan: And we're going to actually launch the The challenge for this one is not offline but we're going to do it now in this next 45 minutes or so. 6 00:00:25.710 --> 00:00:47.280 Julie Hogan: So this will, this will feel on zoom or like a more like a quiet working time and then we'll go immediately over the solutions after our break so we're here we're into the this challenge, which is very similar it follows basically directly from your offline challenge yesterday so. 7 00:00:48.330 --> 00:01:04.170 Julie Hogan: What we were talking about in in the previous lessons that I consider most important is that we went over obviously the physics object extractor tool which is going to be our main tool for doing a mini analysis in this workshop. 8 00:01:05.790 --> 00:01:18.030 Julie Hogan: But we talked about for electrons for photons from you ons for towers for jets we talked about the idea of identification algorithms for these objects. 9 00:01:18.840 --> 00:01:33.330 Julie Hogan: We talked about the idea that matt was just referencing of loose versus medium versus tight identification algorithms where we're always having to decide how we want to trade off. 10 00:01:34.650 --> 00:01:43.740 Julie Hogan: Efficiency of selecting a certain object for purity of selecting that object, efficiency and purity are always going to have a trade off. 11 00:01:44.820 --> 00:01:52.860 Julie Hogan: Since we cannot, we have no, we have no truth information, especially when we're looking at data we can't be completely sure what we're what we're selecting. 12 00:01:53.490 --> 00:02:04.800 Julie Hogan: So we talked about identification criteria, how that's related to the cms detector based on the conditions that we apply and we talked about isolation. 13 00:02:05.640 --> 00:02:15.360 Julie Hogan: Which again matt was referencing if you have some object of interest and you wrap a Cone around it, you can query how much other radiation, how much other energy. 14 00:02:15.780 --> 00:02:26.940 Julie Hogan: Is in this Cone and that gives you physics information about what is going on in the vicinity of your of your physics object which could lead you to different hypotheses about where it came from. 15 00:02:28.470 --> 00:02:38.610 Julie Hogan: So what we want to do to put that stuff together is start to look at the actual mini analysis example that we're going to do. 16 00:02:39.810 --> 00:02:41.370 Julie Hogan: My dog is distressed hold on. 17 00:02:55.770 --> 00:02:58.260 Julie Hogan: Okay, they trashed has been successfully collected. 18 00:02:59.580 --> 00:03:09.720 Julie Hogan: Hopefully we're okay now okay we're going to we're going to talk about the actual physics analysis that we're going to do, which is. 19 00:03:10.470 --> 00:03:23.400 Julie Hogan: higgs bosons decaying to tell leptons so we have this outreach analysis that has been put together there's a lot of resources for it on the open data portal and we're going to use that as our example. 20 00:03:24.120 --> 00:03:31.230 Julie Hogan: And so it's it's a higgs boson decaying to two towers and one of those towers decays hydroponically. 21 00:03:32.580 --> 00:03:50.760 Julie Hogan: The other town decays to imbue on and all the requisite neutrinos that would come along with that so that's the workshop example and then of course you all have your own your own physics processes that you're interested in perhaps the one you considered considered yesterday. 22 00:03:51.960 --> 00:03:58.590 Julie Hogan: If you want to continue with that or perhaps you have some some analysis of your own that you're already interested in. 23 00:03:59.670 --> 00:04:05.520 Julie Hogan: So what I would like you to do for the next for the next 40 minutes is consider. 24 00:04:06.660 --> 00:04:22.920 Julie Hogan: At least for the higgs search because that's that's what we working with so, at least for the next search see if you can use the information from this from this lesson from previous lessons to sketch out, and this is kind of a paper pencil maybe type exercise Google Doc type exercise. 25 00:04:24.210 --> 00:04:42.060 Julie Hogan: answers to these several questions first about your signal so which final state particles, would you expect to observe in the detector from the signal process which is either higgs to tau tau with one town to Cain hydroponically and the other talented came to me ons. 26 00:04:43.200 --> 00:04:52.350 Julie Hogan: Or to excuse me to me on sealer or your own personal analysis example what final say particles, would you expect to observe. 27 00:04:53.070 --> 00:05:05.400 Julie Hogan: and based on those particles, how could we actually write that down in terms of objects, so I don't want to say, well, there should be a new one, I want to be more specific than that. 28 00:05:05.790 --> 00:05:16.020 Julie Hogan: But type of nuance which identification do I think I might apply which isolation, do I think I might apply which trigger do I think might give me that new on things like that. 29 00:05:18.090 --> 00:05:29.370 Julie Hogan: And then same question for the background so so matt actually had you guys think last time about what processes might be backgrounds so same question again what processes might be backgrounds. 30 00:05:30.090 --> 00:05:44.310 Julie Hogan: And then, specifically how might we go about getting rid of them how might we go about using physics object definitions how might we reduce the rate of background, while keeping. 31 00:05:44.820 --> 00:05:56.460 Julie Hogan: The rate of signal so see if you can, if you can think this out walk through these bullet point questions about signal and about background and take a while to. 32 00:05:57.270 --> 00:06:12.720 Julie Hogan: hypothesize how you would set up this analysis, at least for higgs to town town and then, when we come back together after the break we'll go through it, which will set us up for the next upcoming lesson on that on that mini analysis exercise. 33 00:06:16.680 --> 00:06:21.180 Edgar Fernando Carrera Jarrin: Julie, I see 3D raised hands I don't know leftovers. 34 00:06:21.810 --> 00:06:23.610 Julie Hogan: Let me grab the. 35 00:06:24.360 --> 00:06:30.390 Julie Hogan: list okay I, so I don't know who was first so let's go with on Monday. 36 00:06:57.390 --> 00:06:58.530 Julie Hogan: Or maybe funny oh. 37 00:07:12.690 --> 00:07:15.360 Edgar Fernando Carrera Jarrin: yeah maybe they were leftover from matt said. 38 00:07:15.930 --> 00:07:17.850 Julie Hogan: Welcome to type your question in the chat. 39 00:23:58.860 --> 00:24:13.500 Julie Hogan: hey just to check in with everybody we've got about 20 minutes left in this session before the break so if you're having any any questions about like how you might answer any of these questions, or like how you might get the information, please let me know. 40 00:24:18.750 --> 00:24:25.140 Julie Hogan: and see if you can think through planning this analysis out a little bit in the next 20 minutes. 41 00:39:34.380 --> 00:39:44.040 Julie Hogan: Okay, we have just about five minutes left in this session so just to give you a heads up for after the break, we will talk through. 42 00:39:44.580 --> 00:39:55.140 Julie Hogan: This analysis selection process for higgs to tau tau, but I would love to do a couple more examples, so if you're willing to share in the next session. 43 00:39:55.890 --> 00:40:06.270 Julie Hogan: What your analysis example is, and let us kind of walk through that as well, that would be awesome So if you can think of it think ahead if you'd be willing to do that. 44 00:40:06.810 --> 00:40:20.640 Julie Hogan: And then we'll come back after the break at 10 after is that right at 10 after the hour yep we'll come back after the break and we'll go through all of these things. 45 00:40:39.150 --> 00:40:51.900 Julie Hogan: So, this would also be a great time if there any questions from this whole lesson really including what we talked about yesterday, if there are any questions you'd like to already asked, now we happy to answer them. 46 00:40:58.920 --> 00:41:03.570 Edgar Fernando Carrera Jarrin: Julie, could you take down your your slide so I can post my sign. 47 00:41:04.260 --> 00:41:06.960 Edgar Fernando Carrera Jarrin: I promise at the right time, this time. 48 00:41:21.180 --> 00:41:23.250 Edgar Fernando Carrera Jarrin: Thank you i'll See you in a bit.