WEBVTT 1 00:00:02.010 --> 00:00:15.299 José Zurita: This is what was needed, this is a green light to start Okay, so we start the next session of the workshop, and with that with the young, trying to demystify that their mother is Jeff I said i'm in this channel, so please go ahead. 2 00:00:16.350 --> 00:00:19.170 Jan Heisig: Is that private the ester exactly. 3 00:00:20.490 --> 00:00:29.460 Jan Heisig: you're already looked into my slides yeah thanks a lot for having me here, I will tell, I mean I will give you a fan of a logical perspective on dark matter and. 4 00:00:30.090 --> 00:00:48.570 Jan Heisig: Well, try to motivate a little bit that if you look into teacher mediators met searches are probably not the way to go at the lsc but it's that it's very likely actually that we might see long as particles at the lsc when we talk about dark matter. 5 00:00:50.430 --> 00:00:54.960 Jan Heisig: Now yeah exactly this is the Channel and to teach no mediator models. 6 00:00:56.100 --> 00:01:09.270 Jan Heisig: Now I think in general Doc metre is one of the main motivations, I think, for for looking for new physics and, although there are of course plenty of ways to couple that metric to the standard model. 7 00:01:10.230 --> 00:01:20.580 Jan Heisig: The way these searches word interpreted by the lc collaborations were mainly in terms of simplified models, where you really look into the low energy. 8 00:01:21.150 --> 00:01:36.090 Jan Heisig: degrees of freedom of a certain theory and look and they're basically these two options and as channel and a teacher no mediator and the teacher the mediator in particular is very interesting because it has a quite rich phenomenology and although. 9 00:01:37.560 --> 00:01:48.600 Jan Heisig: You typically might think of it, as I said at some low energy degrees of freedom of a more complete theory, in principle, these models are consistent in the way that. 10 00:01:49.140 --> 00:02:00.120 Jan Heisig: They are realizable our gauge series where you can write down the master and everything is fine principle now in the analysis and what what you basically do is to to. 11 00:02:01.080 --> 00:02:12.990 Jan Heisig: introduce the document a particle and some some partner that is also on the Z to a cemetery that stabilizes dark matter, and here we have the susie example where you. 12 00:02:17.340 --> 00:02:24.240 Jan Heisig: know as the dark matter and scale, the core partner as the mediator, they would have this you call the type of direction that you see. 13 00:02:24.510 --> 00:02:35.310 Jan Heisig: down here in in in the MSM this coupling would be given by the gauge coupling, which is of course not the case in general, also in the exceptions to the MSM this might be free parameter. 14 00:02:37.650 --> 00:02:38.070 Jan Heisig: Now. 15 00:02:39.090 --> 00:02:58.140 Jan Heisig: Some time ago people started to study these kind of molds and more systematic way, for instance collaborators mine, who really went out and studied all the different spin assignments and coupling to the various generations, of course. 16 00:02:59.280 --> 00:03:12.570 Jan Heisig: and studied the constraints on such models, if you really take these low energy degrees of freedom as all that there is relevant for for the phenomenology and. 17 00:03:13.170 --> 00:03:24.360 Jan Heisig: Do the density computation indirect and direct detection constraints and look what actually remains and it's surprisingly little that remains so here's the case. 18 00:03:25.320 --> 00:03:40.200 Jan Heisig: off the susie like T channel media to model where you have this Marianna for me on dark matter and a scale a mediator, and this is promised space in terms of the dark matter mass and the relative mass but in between that mediator and. 19 00:03:40.740 --> 00:03:48.180 Jan Heisig: dark matter and the Gray shading is here the coupling that you would need to get the right radek density um. 20 00:03:48.690 --> 00:04:00.540 Jan Heisig: And you have several constraints, do you see shockingly few little spot that are still allowed and these unfortunately are not ready, very much in the reach of llc so. 21 00:04:01.230 --> 00:04:10.650 Jan Heisig: yeah so you might think it's a good idea to look for these models at the IOC at all and it's even worse if you look into other choices, for instance, if you're looking to. 22 00:04:11.070 --> 00:04:26.580 Jan Heisig: Non self conjugate dogma better, then you see actually that all of the parameters space with the size of a coupling so in the wimp region is actually excluded by all the searches without the llc already. 23 00:04:28.530 --> 00:04:32.340 Jan Heisig: However, there is this white spot down here which for all. 24 00:04:34.410 --> 00:04:41.610 Jan Heisig: All of these models is actually in touch by all these constraints and you might wonder what happens there so technically. 25 00:04:42.270 --> 00:04:50.790 Jan Heisig: The coupling should be very small in this region so let's see what happens there and to understand this, let us very briefly just review, I mean. 26 00:04:51.180 --> 00:05:04.320 Jan Heisig: What what happens what what what is actually the dependence of the relic density on this coupling Lambda Chi that I introduce so in the usual freeze out scenario that all of you probably know. 27 00:05:05.370 --> 00:05:07.620 Jan Heisig: where you have large couplings. 28 00:05:08.760 --> 00:05:18.480 Jan Heisig: You have just this animation of dark matter that governs erratic density, so the wreck densities just inversely proportional to some power of the coupling. 29 00:05:19.230 --> 00:05:28.830 Jan Heisig: However, depending on the mass splitting between the mediator and that dark metro particle actually significant contribution for mediate to pan elation or this coordination. 30 00:05:30.150 --> 00:05:31.740 Jan Heisig: Can can play a role in. 31 00:05:32.790 --> 00:05:36.540 Jan Heisig: In the freezer so this quarter actually bounce down and. 32 00:05:37.050 --> 00:05:44.520 Jan Heisig: In the case of sufficiently small couplings it's just the mediator panel ation that is important in the early universe, and in this case. 33 00:05:44.820 --> 00:05:56.760 Jan Heisig: The rhetoric densities actually not dependent on the coupling anymore, however, if you reach a certain smallness of this coupling another process is actually important. 34 00:05:57.330 --> 00:06:07.260 Jan Heisig: which typically is assumed to be efficient, but it's not for very small companies, namely the conversions between dark matter, and this mediated particle and. 35 00:06:08.820 --> 00:06:19.530 Jan Heisig: Once these conversions are not efficient anymore, or at the edge of being efficient, they can actually initiate the breakdown of chemical good even so they can. 36 00:06:19.860 --> 00:06:34.470 Jan Heisig: Actually govern the freeze out and that's a distinct freeze up mode, which we call covered under freezer or coast kettering and that's another film illogical distinct region and, if you want to know where they sits I mean. 37 00:06:35.760 --> 00:06:45.150 Jan Heisig: You can have probably already guessed, but let me just just show you this this curve again for some particular mass point and. 38 00:06:46.200 --> 00:06:49.140 Jan Heisig: The redick density that we measured oh point one two. 39 00:06:50.190 --> 00:06:53.820 Jan Heisig: If they end up like this, you clearly find this wimp. 40 00:06:55.170 --> 00:07:04.650 Jan Heisig: solution for the correct answer you will basically sitting here, however, if the curve looks like this, so for another point in the mass parameter plane. 41 00:07:05.550 --> 00:07:15.900 Jan Heisig: You may find a region here, and this is exactly in this white region down here we get or solution for the roof is density for this conversion freeze out. 42 00:07:16.770 --> 00:07:26.370 Jan Heisig: And you might also be at this plateau which is which corresponds basically to this boundary here, where the coupling actually drops by orders of magnitude. 43 00:07:27.750 --> 00:07:37.710 Jan Heisig: Why is it important for the llc now because it this converter and fees are really predicts long with particles at the lsc with typical. 44 00:07:38.250 --> 00:07:48.210 Jan Heisig: Life times or decay length of basically wow millimeters two meter so roughly a few centimeters typically and that's because. 45 00:07:48.630 --> 00:07:55.800 Jan Heisig: If conversions should be at the order of the hubble rate, which means that they are on the edge of being efficient. 46 00:07:56.250 --> 00:08:02.490 Jan Heisig: And the case which are just one part of the conversions should be of the order of the hubble rate. 47 00:08:02.820 --> 00:08:12.390 Jan Heisig: or smaller That means the decay length is off the order or larger than the inverse helper rate which you can translate actually into a centimeters for typical. 48 00:08:12.870 --> 00:08:30.540 Jan Heisig: freeze out temperature so for these tests scale particles, that we can prob at the LSE we naturally have these little particles and that's why in all these white spots, the way to look into his longest particles so there's one more thing to the story, namely. 49 00:08:32.220 --> 00:08:35.940 Jan Heisig: there's been recent progress and the dancing computation. 50 00:08:37.170 --> 00:08:41.700 Jan Heisig: Meaning that we further looked into bounce days effects that. 51 00:08:42.270 --> 00:08:53.400 Jan Heisig: Are I mean known to be potentially important in these sorts of model because you have this colored mediated political and they can form band states, however, for this very small mass. 52 00:08:53.760 --> 00:09:05.970 Jan Heisig: Gaps so in this converter and freeze that region, you have a prolonged freezer process so it's not an instantaneous one, so these bad state effects are actually super important there and. 53 00:09:06.720 --> 00:09:15.630 Jan Heisig: Well, you can of course read read our papers is very interesting, but I mean the upshot and, what is important for us here is that the region where you have this. 54 00:09:16.080 --> 00:09:33.390 Jan Heisig: Basically, this this, along with particles, so this white region down here which looks a bit different here because we are plotting it linearly So this is the mass splitting again, and this is the dark matter mass so this region here is actually. 55 00:09:34.620 --> 00:09:50.520 Jan Heisig: pretty much enhance So this is the just preservative computation for this boundary between the wind bridge and the converted room freeze up region, and this is the actually the the solution if we take into account bounce states and even excited bout states. 56 00:09:52.890 --> 00:10:02.010 Jan Heisig: So this endpoint in particular goes from two 1.63 or so TV to for TV so yeah this is. 57 00:10:03.090 --> 00:10:04.710 Jan Heisig: quite large rate. 58 00:10:05.610 --> 00:10:06.600 Jan Heisig: yeah and it means. 59 00:10:07.140 --> 00:10:08.520 Jan Heisig: Three minutes Okay, thank you. 60 00:10:08.850 --> 00:10:09.240 So. 61 00:10:10.320 --> 00:10:18.540 Jan Heisig: How would you look into these long of particles at the LSE so here, in this case it's called a parks that could be produced. 62 00:10:19.800 --> 00:10:26.580 Jan Heisig: They could typically decay inside the detector into a soft jet and and. 63 00:10:27.780 --> 00:10:38.880 Jan Heisig: And dark matter, and here I would like to to highlight that this is a soft tissue chat that that and the signature somehow falls a little bit into the between. 64 00:10:39.450 --> 00:10:47.820 Jan Heisig: The typical targets that that i'll look for it, the oC so typically you either look into something like split susie where you have a. 65 00:10:49.020 --> 00:11:00.540 Jan Heisig: Our heart and from from us a glue ino that then the case into relatively hard jets in a displaced vertex or you look into something like a charge gino. 66 00:11:01.110 --> 00:11:15.180 Jan Heisig: That the case into a super soft pirate like hundreds of MTV just and missing energy, but this is something like the soft chat has something like typical. 67 00:11:16.470 --> 00:11:26.580 Jan Heisig: Energy of this delta n so say 2040 maybe 50 gv so this actually found that neither the. 68 00:11:28.140 --> 00:11:35.880 Jan Heisig: Displaced vertices search nor the disappearing track searches really targeted to this kind of scenario those, this is a. 69 00:11:36.720 --> 00:11:54.270 Jan Heisig: While there's basically what comes out if you look into this teacher moles and, of course, once in a while, depending on the exact lifetime, it could also traverse all of the texture and so gives us highly ionizing tracks, and this is the current LP constraints that we examined here. 70 00:11:55.380 --> 00:12:09.180 Jan Heisig: For I mean for very small mass shootings So this is the bottom partner, so if it's below the bottom threshold there this to body decay suppress So here we really have detector stable particles, we can directly. 71 00:12:10.440 --> 00:12:17.130 Jan Heisig: integrate the art and searches for these kinds of searches here, we had to reinterpret them and this. 72 00:12:21.390 --> 00:12:35.940 Jan Heisig: What we would for disappearing tracks and today's vertices searches actually suffered a lot from an invariant mascot that was imposed in the experimental setup and then basically killed our sensitivity for this rather softish jets. 73 00:12:37.290 --> 00:12:42.000 Jan Heisig: yeah so there's still quite some room to be explored here. 74 00:12:43.170 --> 00:12:48.570 Jan Heisig: Okay, I think my time is up, I, I just want to flesh, of course, I mean this this. 75 00:12:50.340 --> 00:13:07.590 Jan Heisig: This this this one point for TV heavy saver chargeable particle access with a mass one point for most likely, which of course fits very well here principle and you see also the importance of these effects, but I mean. 76 00:13:07.650 --> 00:13:09.240 Jan Heisig: We have discussed this on Tuesday. 77 00:13:10.170 --> 00:13:21.510 Jan Heisig: Clearly there is something that that points to maybe something more weird than that, but I just wanted to flesh out, I mean that that in principle from from the Cross section. 78 00:13:22.920 --> 00:13:36.540 Jan Heisig: That we expect here, this would fit very well, if only one would see it in the time of flight measurement so very, very briefly, my summary so with the upside is really that teacher mediator models. 79 00:13:37.980 --> 00:13:39.810 Jan Heisig: The wind parameter space almost. 80 00:13:39.810 --> 00:13:42.750 Jan Heisig: excluded the remaining region is the converter freedom. 81 00:13:43.110 --> 00:13:59.190 Jan Heisig: region which is less explored, but gives us really as a prediction, not just in some corner of it along the particles at the oC which can be looked for and we've seen that these bounced at factor actually largely enhance this region. 82 00:14:00.810 --> 00:14:01.890 Jan Heisig: Where we expect. 83 00:14:02.100 --> 00:14:04.380 Jan Heisig: lps and the kinematics differ. 84 00:14:04.500 --> 00:14:06.450 Jan Heisig: From the one that is currently. 85 00:14:06.990 --> 00:14:08.580 Jan Heisig: looked into it, so the targets. 86 00:14:08.880 --> 00:14:12.150 Jan Heisig: Either split susie or charge he knows. 87 00:14:12.270 --> 00:14:14.040 Jan Heisig: That he came to very soft. 88 00:14:14.370 --> 00:14:18.870 Jan Heisig: pie, and this is maybe something that could be looked looked into. 89 00:14:20.520 --> 00:14:26.940 Jan Heisig: More dedicated Okay, thank you very much for your attention and sorry for being probably going over time. 90 00:14:27.570 --> 00:14:33.210 José Zurita: Thanks young or they started I think what means pay and then we'll open the floor for questions. 91 00:14:41.700 --> 00:14:49.470 José Zurita: Okay, so let me ask Michael something so, you said that the, although the signature wife, you would say like disobedient track should work. 92 00:14:50.040 --> 00:15:00.990 José Zurita: there's a cat in there, that is making the search not very effective, for your setup and now, did you look into the disability track before because probably that causes trouble with some unwanted background so. 93 00:15:02.460 --> 00:15:12.270 José Zurita: It somehow clear from him naive estimation, that if you remove this card, then you will gain sensitivity, or is really the way to the recipient tracking you. 94 00:15:13.470 --> 00:15:15.630 Jan Heisig: know this, this is this place versus. 95 00:15:15.810 --> 00:15:16.410 José Zurita: So the the. 96 00:15:17.010 --> 00:15:29.250 Jan Heisig: game here, this is a displace versus is surgeon, well, we made this exercise, maybe you even remember that because we discuss it at some point. 97 00:15:29.400 --> 00:15:33.450 Jan Heisig: So the thing is that, actually, most of our signal is in that. 98 00:15:33.480 --> 00:15:49.470 Jan Heisig: region below this T 10 gv cut so we, I mean if you, we were able to completely remove this cut, we would actually gain I think two or three artists of magnitude in our signal, so this is a. 99 00:15:49.500 --> 00:15:52.590 Jan Heisig: I think worth looking to of course there's a reason why it was. 100 00:15:52.620 --> 00:16:06.990 Jan Heisig: placed in the first place, however, as far as we could see there's not really much background, so you can easily put it down to five GB as far as I understand you can of course also play because I mean you put it there, because you want to get rid of. 101 00:16:08.190 --> 00:16:09.630 Jan Heisig: background from be be. 102 00:16:09.900 --> 00:16:11.460 Jan Heisig: deemed as and stuff like that, but you. 103 00:16:11.460 --> 00:16:16.560 Jan Heisig: could of course play around with having a slum what tighter caught on. 104 00:16:17.250 --> 00:16:32.130 Jan Heisig: On the displacement so require slightly larger displacement but reduce that delta that varian mascot I think this is some things worse playing around with so what what we've seen from signal point of view, this is really. 105 00:16:32.130 --> 00:16:33.900 Jan Heisig: What kills the signal this case. 106 00:16:35.610 --> 00:16:43.560 Jan Heisig: And I don't have the plot here, but I mean the the sensitivity was really I mean if you would remove it, I think the the sensitivity would be something like here. 107 00:16:45.720 --> 00:16:48.210 Jan Heisig: And without us basically it's hidden here. 108 00:16:49.320 --> 00:16:56.940 José Zurita: And I get it okay Okay, thank you very much, so we have time we'll move to our next speaker with and yeah again. 109 00:16:57.600 --> 00:16:58.260 Jan Heisig: Thank you. 110 00:17:00.000 --> 00:17:01.110 José Zurita: We have under. 111 00:17:01.740 --> 00:17:02.790 Andre Scaffidi: hi can you hear me. 112 00:17:02.850 --> 00:17:05.730 José Zurita: Yes, loud and clear, can you try to share your screen. 113 00:17:05.820 --> 00:17:06.570 Absolutely. 114 00:17:07.980 --> 00:17:09.810 José Zurita: Book why, when he and stop sharing. 115 00:17:09.840 --> 00:17:11.550 Jan Heisig: yeah I just have to. 116 00:17:12.180 --> 00:17:18.180 Jan Heisig: Ah, good them because I got rid of the I think here, here it is right. 117 00:17:20.130 --> 00:17:20.610 Andre Scaffidi: There we go. 118 00:17:21.300 --> 00:17:22.590 José Zurita: Under can you try now. 119 00:17:22.860 --> 00:17:24.270 Andre Scaffidi: Yes, I can. 120 00:17:26.310 --> 00:17:27.030 Andre Scaffidi: There we go. 121 00:17:28.110 --> 00:17:29.130 Andre Scaffidi: Can we all see this. 122 00:17:29.490 --> 00:17:34.740 José Zurita: Look it's fine yeah perfect so, can you try to go back and forth one one perfect. 123 00:17:34.800 --> 00:17:44.970 José Zurita: Perfect okay so without further whoo now are the different to take that the left, about the elastic that matter, this is a little a let you know when you have two minutes left. 124 00:17:45.360 --> 00:17:51.450 Andre Scaffidi: I think, thank you so i'll be discussing recent study we've just completed regarding inelastic dark matter. 125 00:17:52.500 --> 00:18:01.380 Andre Scaffidi: In the context of future propose experiments at the nfc so brief overview basically we try and do our best to survey the landscape. 126 00:18:03.480 --> 00:18:06.720 Andre Scaffidi: Basically utilizing a few of the proposed. 127 00:18:07.890 --> 00:18:13.500 Andre Scaffidi: detect the geometries, some of which have been discussed this week in the context of a standard elastic. 128 00:18:14.700 --> 00:18:27.450 Andre Scaffidi: setup will be extended some work that's been previously done by Felix clean and collaborators incense have updated detector parameters, as well as just new experiments being proposed. 129 00:18:28.920 --> 00:18:30.060 Andre Scaffidi: As they come online so. 130 00:18:31.350 --> 00:18:46.650 Andre Scaffidi: So, just a brief motivation and so inelastic dark matter consists of effectively almost degenerate mistakes and so we've seen that this sort of setup led to suppress duck metal nuclear couplings. 131 00:18:47.370 --> 00:18:48.300 Andre Scaffidi: And so, this. 132 00:18:48.390 --> 00:18:55.170 Andre Scaffidi: can help us start to evade detection expect that direct detection constraints which are currently getting very strong. 133 00:18:56.460 --> 00:19:04.920 Andre Scaffidi: For the constellations in the universe can determine and set the relic abundance, which is then at later times suppressed. 134 00:19:05.550 --> 00:19:14.280 Andre Scaffidi: And so we can see the tenuously evade stringent SMB constraints, while also producing a stable thermal thermal relic which we denote one. 135 00:19:15.240 --> 00:19:30.840 Andre Scaffidi: Other inventively and so they're relatively light mediator isn't required to explain the dark matter abundance by a standard femoral frees up processes and when we choose, is the Of course I suppose the standard Doc photon. 136 00:19:31.380 --> 00:19:34.050 Andre Scaffidi: And so to set up our model we consider a Doc sector. 137 00:19:34.170 --> 00:19:47.520 Andre Scaffidi: containing, as I mentioned to almost a generic mass states coupled through a Doc photon mediator, the strength of which is given in this term here by a kinetic mixing parameter epsilon. 138 00:19:48.810 --> 00:19:57.420 Andre Scaffidi: And so we consider a couple of cases first week until semiotic states, and so we have marijuana firm aeons with a. 139 00:19:58.710 --> 00:20:02.550 Andre Scaffidi: vertex coupling to duck float on like this, we consider a scale a case. 140 00:20:03.930 --> 00:20:08.100 Andre Scaffidi: And of course the relevant vertex for. 141 00:20:08.280 --> 00:20:11.490 Andre Scaffidi: A phenomenology is going to be how our state's. 142 00:20:11.610 --> 00:20:15.210 Andre Scaffidi: couple through this stock photo into the standard model given like so. 143 00:20:16.500 --> 00:20:23.760 Andre Scaffidi: And so i've highlighted our kinetic mixing here, which will be eventually what we constrain as a model parameter. 144 00:20:25.590 --> 00:20:30.210 Andre Scaffidi: The next parameter of interest is going to be this term delta, which is basically proportional to the. 145 00:20:30.210 --> 00:20:33.360 Andre Scaffidi: Mass splitting where i've hired the mass of the. 146 00:20:33.480 --> 00:20:42.210 Andre Scaffidi: ledger state so i'll stay with dogmatic candidate, and this is going to be the other model parameter we construct okay so epsilon and one of the the premise of interesting. 147 00:20:44.130 --> 00:20:53.250 Andre Scaffidi: Okay, so production, the dominant production because for drug in through some is that both on all the photon until our elastic. 148 00:20:54.360 --> 00:21:09.420 Andre Scaffidi: States here this heavy estate cartoon then propagates off and then probably the case or you know show on Shell duck photon into some semiotic final states which should be picked up by our detector. 149 00:21:11.820 --> 00:21:13.140 Andre Scaffidi: Okay, just going into the. 150 00:21:13.740 --> 00:21:15.810 Andre Scaffidi: into some detail here about how we. 151 00:21:15.900 --> 00:21:22.950 Andre Scaffidi: conduct the analysis it's a very straightforward analysis, of course, the main ingredient is going to be the expected number of signal events we expect to see. 152 00:21:23.730 --> 00:21:35.070 Andre Scaffidi: And this is, of course, proportional to the production cross section of our car one car two states from proton proton collisions multiplied by some integrated luminosity. 153 00:21:35.610 --> 00:21:48.630 Andre Scaffidi: And some parameter which i've called F signal which is basically the expectation of detector efficiency multiply by the probability of our heavy and elastic state decaying within the detector volume. 154 00:21:49.920 --> 00:21:58.800 Andre Scaffidi: And so functionally we this is computed by averaging over all of the possible kinematic configurations of our heavier state using mad rough. 155 00:22:00.690 --> 00:22:13.020 Andre Scaffidi: And so again getting slightly more into this, the the piece of interest here this probability is given by this combination of exponential terms here. 156 00:22:14.580 --> 00:22:16.260 Andre Scaffidi: Of note is this. 157 00:22:17.400 --> 00:22:18.030 Andre Scaffidi: elba. 158 00:22:18.090 --> 00:22:23.970 Andre Scaffidi: Which is just the expected expected detailing, which is of course in inversely proportional to the decay with. 159 00:22:24.060 --> 00:22:24.840 The process. 160 00:22:25.890 --> 00:22:39.420 Andre Scaffidi: This l entry and exit here or just simply the entry and exit points of our detective volume assuming the longest particle basically travels from the interaction points straight to the detective doesn't again. 161 00:22:40.500 --> 00:22:42.630 Andre Scaffidi: And so schematically the little picture here. 162 00:22:43.800 --> 00:22:53.610 Andre Scaffidi: We calculate this entry and exit by stimulating Monte Carlo realizations of our decay process and then determining the three momentum trajectories like so. 163 00:22:56.190 --> 00:22:59.910 Andre Scaffidi: Furthermore, the other kind of important thing to note is. 164 00:23:00.990 --> 00:23:13.110 Andre Scaffidi: We impose then a detective dependent energy cut on these final state film ian's here, which is just the total cut on the total visible energy of the particles basically preparing for any. 165 00:23:14.220 --> 00:23:20.520 Andre Scaffidi: You know detector energy thresholds that we might have in the future and discuss a little bit about that later. 166 00:23:21.090 --> 00:23:27.180 Andre Scaffidi: So that's a schematic setup Okay, so as far as the experiments, we consider either. 167 00:23:27.360 --> 00:23:43.770 Andre Scaffidi: cartoon so a bunch of these, as I mentioned have been discussed at length this week so enthused facet Codex be map map one and two fazer a new bus and Alex here as far as the numerical implementation. 168 00:23:43.860 --> 00:23:45.570 Andre Scaffidi: Of these geometries we took. 169 00:23:46.740 --> 00:23:54.870 Andre Scaffidi: Basically, the most recent and up to date values we can find in the proposals in the literature implemented as best implemented them as best we can. 170 00:23:56.820 --> 00:24:01.080 Andre Scaffidi: Okay, keeping things moving on to some results So here we have. 171 00:24:02.160 --> 00:24:04.980 Andre Scaffidi: The forecasted 95%. 172 00:24:05.340 --> 00:24:07.740 Andre Scaffidi: Confidence interval limits on the semiotic. 173 00:24:07.860 --> 00:24:08.370 case. 174 00:24:10.080 --> 00:24:18.330 Andre Scaffidi: Basically, these contracts correspond to apple for some fluctuation of three events in the absence of any significant background contribution. 175 00:24:19.440 --> 00:24:29.550 Andre Scaffidi: We have for benchmarks, corresponding to different values of this mass splitting parameter delta and the ratio of the photon last to the lighter. 176 00:24:30.780 --> 00:24:32.610 Andre Scaffidi: The particle mass here. 177 00:24:33.450 --> 00:24:37.080 Andre Scaffidi: And so, as we can see the color contours correspond to. 178 00:24:37.560 --> 00:24:48.300 Andre Scaffidi: The predicted sensitivities in each of these experiments, we can carve out quite a significant chunk of the currently an unexplored parameter space here, which is nice. 179 00:24:49.290 --> 00:24:52.110 Andre Scaffidi: The Alex detector being especially. 180 00:24:54.690 --> 00:24:57.120 Andre Scaffidi: Good which was interesting to see. 181 00:24:58.890 --> 00:25:00.780 Andre Scaffidi: Some things to notice the. 182 00:25:01.980 --> 00:25:07.230 Andre Scaffidi: focus that sensitivities move to higher values of the kinetic mixing and the. 183 00:25:08.280 --> 00:25:16.560 Andre Scaffidi: Mass when we decrease our mass budding primitive him by an order of magnitude, this is basically due to the fact that the. 184 00:25:17.520 --> 00:25:28.050 Andre Scaffidi: decay with goes as Basically, this is delta power five and so to produce the same number of particles, we need to increase the coupling strength and the mass So this was expected. 185 00:25:29.640 --> 00:25:31.980 Andre Scaffidi: The brain regions correspond to current. 186 00:25:32.040 --> 00:25:34.920 Andre Scaffidi: Experimental constraints on the dark photon. 187 00:25:36.180 --> 00:25:48.750 Andre Scaffidi: And finally, just for completeness, we include a contour this black line here and each of these plots that correspond to the case where the stable dogmatic candidate, the sky one saturates, the observed for like abundance. 188 00:25:52.020 --> 00:26:02.370 Andre Scaffidi: So for the scale a case we found basically the same result and so just for demonstration we we plot, the first benchmark here. 189 00:26:03.090 --> 00:26:10.380 Andre Scaffidi: This could pretty much be explained by the fact that the decay length for the scale and the feminine a case where observed to be approximately the same. 190 00:26:10.980 --> 00:26:24.990 Andre Scaffidi: And so, this was somewhat interesting but pretty much expected something else, we observed was the effect of changing this energy cut that we can post. 191 00:26:26.040 --> 00:26:33.600 Andre Scaffidi: For third detector, and so what we've done here on this plot is we show the case for us learn and phase two. 192 00:26:34.890 --> 00:26:42.840 Andre Scaffidi: And this was just basically done to demonstrate examples of an off access compared with a forward detector. 193 00:26:44.100 --> 00:26:50.370 Andre Scaffidi: And so we can see that changing the energy threshold by gv the food labs and off access type. 194 00:26:51.510 --> 00:27:00.450 Andre Scaffidi: proposal could actually significantly change the forecast of sensitivity, something that we certainly didn't appreciate before doing this. 195 00:27:03.780 --> 00:27:05.370 Andre Scaffidi: And that's it short, sharp and shiny Thank you. 196 00:27:07.110 --> 00:27:11.010 José Zurita: very much for the token we open the floor for questions. 197 00:27:18.300 --> 00:27:24.870 José Zurita: Okay, if if another will I will use my powers to ask you something so it's just a curiosity, maybe they look into it. 198 00:27:25.320 --> 00:27:31.140 José Zurita: But I think you have a guide to the the K two K one F bar for interesting Medusa incorrectly or whatever. 199 00:27:31.890 --> 00:27:42.600 José Zurita: They should differ from the let's say normal range bar of a scale or became to fx bar because of the city or the county so you'll see one of these guys by the good look not really looking like a. 200 00:27:43.410 --> 00:27:56.790 José Zurita: scale or the K, so I don't know if you look into sort of some materials of the F per the case in case you say if there's a signal I should be able to say this looks more like elastic the math on a scale of the cane or. 201 00:27:57.480 --> 00:28:02.040 Andre Scaffidi: No, no, we didn't have, but this is certainly a good idea and a good proposal to look at. 202 00:28:03.510 --> 00:28:11.280 José Zurita: Now I was just curious if you know, because at some point, you will see things the same way to characterization so not keep doing a we exclusion bloods. 203 00:28:12.870 --> 00:28:25.860 José Zurita: So let me see someone else in the meantime God inspired to ask a question, since it doesn't seem to be the case, we think Andre again, and now we move to Nathan. 204 00:28:27.360 --> 00:28:29.610 José Zurita: going to tell us about some quirky stuff. 205 00:28:31.980 --> 00:28:32.790 Nathan Suri Jr: Yes, Hello. 206 00:28:33.960 --> 00:28:36.690 José Zurita: hello, can you try to share your slides. 207 00:28:36.900 --> 00:28:37.800 Yes. 208 00:28:42.180 --> 00:28:42.780 Andre Scaffidi: Okay. 209 00:28:42.960 --> 00:28:48.270 José Zurita: perfect, so please go ahead, I will let you know when you have three minutes left all right. 210 00:28:57.060 --> 00:28:57.450 Nathan Suri Jr: alright. 211 00:28:59.100 --> 00:29:08.580 Nathan Suri Jr: hello, my name is Nathan sorry I am a student at caltech I am currently working at the lauridsen laboratory for high energy physics and today i'll be talking about my work. 212 00:29:08.910 --> 00:29:13.680 Nathan Suri Jr: On a standalone search for court pair production with timing detector at the high Leumi Elliot see. 213 00:29:14.490 --> 00:29:27.420 Nathan Suri Jr: Now to be in let's actually go into what courts are so quirks are actually a heavy a proposed heavy stable charged particle a dark sector analog to standard model corks that are connected by flux tube of dark blue ons. 214 00:29:27.810 --> 00:29:37.020 Nathan Suri Jr: Now to actually probably understand what quirks are, let us go through a little thought experiment so in the standard model to CD case the mass of the Cork is much less than the. 215 00:29:37.710 --> 00:29:50.640 Nathan Suri Jr: dark sorry the confining scale of QC D, however, in the dark or quirk proposed juicy case the mass of the work is much greater than the dark confining scale So what are the. 216 00:29:50.910 --> 00:30:02.850 Nathan Suri Jr: implications of this so in the standard model case, as we all know, the flux tube of do on breaks and the leads to radiation into lighter works, however, stable quirks do not have any lighter. 217 00:30:03.300 --> 00:30:18.000 Nathan Suri Jr: states that maintain quantum numbers, therefore, the flux tube of dark blue ons does not break, as you can see here at the bottom and this actually causes macroscopic Austerlitz or emotion and eventual annihilation so very striking signature deep so. 218 00:30:19.080 --> 00:30:28.170 Nathan Suri Jr: The actual search regime that we are looking at is in this Lambda dark or the dark confining scale between 100 electron volts to 10 kilo electron volts. 219 00:30:28.470 --> 00:30:34.200 Nathan Suri Jr: This correlates to an oscillation amplitude on the order of point one to 10 centimeters. 220 00:30:34.560 --> 00:30:48.000 Nathan Suri Jr: And this is a search currently constrained by the jets plus image search, but, as we know, in general, any current searches are limited by standard trigger acceptances Therefore, the use of any additional kinematic data may improve our reach, as we will see soon. 221 00:30:48.750 --> 00:30:56.700 Nathan Suri Jr: So what actually are the Cork dynamics are, what is the nature, the kinematic nature's of the trajectories of these very unusual particles. 222 00:30:56.970 --> 00:31:04.320 Nathan Suri Jr: See the alert sorry the linked quirk anti quark pairs oscillate while moving outward from an initial collision as we can see your homeland right. 223 00:31:04.680 --> 00:31:15.000 Nathan Suri Jr: Now the interaction with the inner detector does not change the angular momentum of the court system, so this actually leads to the courts having not only a military motion, but a planar oscillation. 224 00:31:16.350 --> 00:31:24.420 Nathan Suri Jr: And, as we know, current reconstruction algorithms are designed to look for helical trajectories, however, with these planar oscillations with corks. 225 00:31:25.470 --> 00:31:37.440 Nathan Suri Jr: They don't really work that month that well so with the current reconstruction algorithms are not designed to handle this very striking signature, however, a full redesign of the current reconstruction algorithms do handle that has. 226 00:31:38.070 --> 00:31:48.270 Nathan Suri Jr: system is unfeasible Therefore we try to look for indirect methods at probing a the core systems and the quick signal, so this is what leads us to our first. 227 00:31:49.320 --> 00:32:01.410 Nathan Suri Jr: strategy of time delay, so in this case time delay refers to the difference between a particle in this case that court reaching a specific region of the detector. 228 00:32:02.880 --> 00:32:08.130 Nathan Suri Jr: So difference between that and a luminous particle so on the left, we see a little schematic. 229 00:32:08.490 --> 00:32:21.810 Nathan Suri Jr: Of the in black the quirks trajectory and an orange hsa aluminum particles going straight from the interest of the interaction point now the background the standard model background should generally have some distribution peaked at zero with some small spread. 230 00:32:22.860 --> 00:32:30.570 Nathan Suri Jr: But the correct signal is expected to have time delays greater than or on the order of one nanosecond so already quite. 231 00:32:30.900 --> 00:32:44.460 Nathan Suri Jr: distinct from the standard model background, and this is because quirks are, as we mentioned earlier, these oscillating heavy masses, which are going to travel slowly and reach the point in the detector, as you can see, on left much slower than just a little. 232 00:32:46.590 --> 00:32:53.970 Nathan Suri Jr: So how are we actually going to look at the timing layer or how are we actually going to pro time delay as a discriminate. 233 00:32:54.540 --> 00:33:08.940 Nathan Suri Jr: Fortunately cms of my lab actually is a collaborator on this is designing a minimum ionizing particle timing detector layer, which is a four millimeter timing detector layer proposed between the tracker and he cal region. 234 00:33:09.420 --> 00:33:19.050 Nathan Suri Jr: designed for charged particles, it is currently currently both a proposed timing, the resolution of 30 Pico seconds for note the btl region or the barrel timing layer 235 00:33:19.710 --> 00:33:32.550 Nathan Suri Jr: is using lysol crystals activated with serial read out with silicon photo multipliers, and the atl or the end CAP timing layer uses radiation tolerant silicon sensors with gain known as l guts. 236 00:33:33.810 --> 00:33:44.310 Nathan Suri Jr: So before we actually get into the the time delay study we actually need to generate the Court Monte Carlo simulations so to do that, as I mentioned earlier, there are two. 237 00:33:44.790 --> 00:33:50.850 Nathan Suri Jr: Three parameters in the Court model, the mass of the work and the dark and finding scale, so my simulations are done. 238 00:33:51.090 --> 00:33:57.060 Nathan Suri Jr: In a scan of this parameter space, the mass of the Court, going from 500 g to 2500 GB. 239 00:33:57.300 --> 00:34:07.470 Nathan Suri Jr: And Lambda dark going from 100 electron volts to three kilo electron volts the actual model used with matt graph is veal Q underscore ufo, which is an extension of standard model. 240 00:34:07.860 --> 00:34:16.200 Nathan Suri Jr: Of the standard model with vector like top partners, as I mentioned earlier quirks are these vector like for me on these heavy seeable charged particles, so we can actually use. 241 00:34:16.770 --> 00:34:26.670 Nathan Suri Jr: This T type court in this model as a proxy for quirks now the samples are generated with zero to one extra jets and the Cork evolution is done through a self made code base. 242 00:34:26.880 --> 00:34:34.950 Nathan Suri Jr: And at right, we can see some Kirk to check sample Kirk trajectories from the simulations showing the characteristic of dilatory motion. 243 00:34:36.810 --> 00:34:46.860 Nathan Suri Jr: Now this actually gets us into the time delay investigation So here we actually see the time delay distributions for the btl region, so the btl being. 244 00:34:47.190 --> 00:34:54.900 Nathan Suri Jr: The barrel timing layer on left, we see the hundred electron volts case for Lambda dark and mass of the work being 1000 gv. 245 00:34:55.110 --> 00:35:01.230 Nathan Suri Jr: and on right we see three kilo electron volts for the Lambda dark and the 1000 TVs for the mass of the Cork. 246 00:35:01.530 --> 00:35:12.390 Nathan Suri Jr: At the bottom we actually see the topology so the event so for the hundred electron whole case you have the larger versions of these oscillation attitudes, as the Court kind of moves out from its original. 247 00:35:15.030 --> 00:35:23.400 Nathan Suri Jr: Production point and and right we have actually interesting enough, the three kilometres or the high limited our region has small oscillation amplitude. 248 00:35:23.670 --> 00:35:33.990 Nathan Suri Jr: And to actually reach the btl later, you actually need to have the pair system recoil off of it, yet so in the hundred ev case you're going to have all. 249 00:35:34.800 --> 00:35:48.060 Nathan Suri Jr: The time delay distribution peek at to nanoseconds and in the right case you see the time delay being approximately 17.5 nanoseconds again because quirks are these heavy oscillating particles. 250 00:35:49.080 --> 00:35:55.110 Nathan Suri Jr: that's why you have this larger time delay, even in the three ke VI region when it's recoiling alpha job. 251 00:35:56.610 --> 00:36:05.280 Nathan Suri Jr: So the btl region actually yields greater time delay statistics in the low Lambda dark region, as we see compared to the hundred ev or though alright sorry as. 252 00:36:05.880 --> 00:36:11.430 Nathan Suri Jr: As you compared to the hi sorry the high Lambda dark region of three kill electron volts. 253 00:36:12.030 --> 00:36:20.400 Nathan Suri Jr: So to actually compare it to the atl region here are the distributions at left again we have the hundred GB case and it right, the three kilo electron bookcase. 254 00:36:20.850 --> 00:36:29.460 Nathan Suri Jr: The time delay is approximately the same order of magnitude, with time delay being a 2.5 nanoseconds on the Left 12 nanoseconds on the right. 255 00:36:29.910 --> 00:36:39.930 Nathan Suri Jr: Note that the atl yields greater timely stats in the high Lambda dark region, however, the overall time delay is, as you saw on the previous slide higher in the. 256 00:36:41.100 --> 00:36:42.480 Nathan Suri Jr: The the right plot. 257 00:36:43.740 --> 00:36:45.060 Nathan Suri Jr: With the btr region. 258 00:36:47.220 --> 00:36:54.870 Nathan Suri Jr: So, now that we actually understand or saw some time delay distributions we can go into the actual the numbers and numeric the quantitative. 259 00:36:55.500 --> 00:37:03.570 Nathan Suri Jr: measurements and here is the actual geometric cut So these are the acceptance is used to make the previous slide where we're requiring least one quirk. 260 00:37:03.750 --> 00:37:09.990 Nathan Suri Jr: To reach the specified layer either the btl or etfs after a Center of mass i'm greater than 12.5 nanoseconds. 261 00:37:10.410 --> 00:37:18.660 Nathan Suri Jr: So, as we can see the general trend of this table is that higher court massive yield lower signal efficiencies, with the exception being the low Lambda dark region. 262 00:37:18.930 --> 00:37:30.060 Nathan Suri Jr: And, in general, upholding the trends from the previous two slides the btl region is better for probing the level Lambda dark region and the EPL is better for probing the high Lambda darker region. 263 00:37:31.350 --> 00:37:37.890 Nathan Suri Jr: Now, now that we actually understand the acceptances we can actually try to implement a kinematic cut here we apply a timing cut. 264 00:37:38.250 --> 00:37:49.860 Nathan Suri Jr: of three nanosecond time to time delay a cut off apply to all events, passing that geometric acceptance on the previous slide so here the btl region maintains more signal efficiency. 265 00:37:50.130 --> 00:37:58.140 Nathan Suri Jr: or sorry the general trend is that the btl region maintains more signal efficiency after the timing cut but, in general we actually do achieve high efficiency. 266 00:37:58.440 --> 00:38:08.130 Nathan Suri Jr: High signal efficiency, greater than 95% for both the btl and atl regions for Lambda dark being greater than or equal to a 25 ev a general. 267 00:38:08.700 --> 00:38:19.980 Nathan Suri Jr: I think previously mentioned the et the btl region does maintain more signal efficiency, especially above masses of 1000 gv but that's, not to say the EPL is poorly performing. 268 00:38:21.870 --> 00:38:38.010 Nathan Suri Jr: So this search of actually looking at court systems represents a departure of simply probing the electric breaking scale and moving towards looking at unique or striking signatures that are potentially observable at the elysee but are currently missable because of. 269 00:38:39.540 --> 00:38:48.930 Nathan Suri Jr: Differences in our workflow, especially in this case the reconstruction algorithms Kirk trajectories in this project were successfully simulated and the signal events regenerated using mad graph. 270 00:38:49.440 --> 00:38:57.030 Nathan Suri Jr: time delay actually proved to be invaluable discriminate for the Court signal motivating the use of the mtd both the btl and atl. 271 00:38:57.780 --> 00:39:06.000 Nathan Suri Jr: separately, as we saw the btl prove more effective, improving the low Lambda dark regime, while the atl prove more effective, improving the Highland the dark regime. 272 00:39:07.110 --> 00:39:13.770 Nathan Suri Jr: Currently, we are exploring playing fitting seated by timing hits as an additional discriminate playing fitting naturally. 273 00:39:14.310 --> 00:39:24.510 Nathan Suri Jr: Is is a pretty obvious idea, as I mentioned earlier, Cork systems have these planar oscillations Therefore, it is natural to try to consider a plane fitting aptitude approach. 274 00:39:25.020 --> 00:39:33.780 Nathan Suri Jr: We are also currently determining and generating possible backgrounds to the Court signal for the timing investigation that would most likely be a soft QC D. 275 00:39:34.650 --> 00:39:47.850 Nathan Suri Jr: simulation with a finite mtd timing resolution and then we want also like to expand the analysis into investigating other quick signatures so currently we're only looking at quartz produced through jelly and processes which allows us to have these. 276 00:39:49.380 --> 00:39:50.700 Nathan Suri Jr: Center model electric charge. 277 00:39:52.050 --> 00:40:00.480 Nathan Suri Jr: And that allows us to use the mtd which is requires us use charged particles, but if we are clever we can potentially expand the analysis into other cases. 278 00:40:01.140 --> 00:40:10.680 Nathan Suri Jr: Maybe even using like playing fitting aptitude example to look at the other production methods, such as the color cases from QC D, or even one charge one neutral, thank you. 279 00:40:11.460 --> 00:40:20.100 José Zurita: Any questions thing, thank you very much nicer So yes, actually we open the floor up for questions so James has a question I know Mike has a question, please mind go ahead. 280 00:40:20.310 --> 00:40:30.600 Michael Albrow: yeah I think very interesting, but I have a question at presumably the quirks will charge and there'll be radiating photons right and. 281 00:40:32.070 --> 00:40:39.060 Michael Albrow: And going to and if one is annihilated the other ones got benign at the same time I don't quite understand what's going on man. 282 00:40:40.020 --> 00:40:47.400 Nathan Suri Jr: Oh, I guess, so do you mean are you asking him I looked at topology the event or. 283 00:40:47.460 --> 00:41:03.030 Michael Albrow: Well, as I understand it, the quirks are charged and then the string of the string of clorox right gosh as they, as they are oscillating and turning around at the end, there must be radiating photons because charged particles. 284 00:41:03.900 --> 00:41:10.800 Michael Albrow: Right, so that will they will cascade down and then annihilate presumably on each other right okay so. 285 00:41:10.890 --> 00:41:25.110 José Zurita: Why not Mike Mike they don't need to have a photon side, so they could be elected, they could be a suit to charge, but they could only be called her a chance if you want not under under a new, they could be totally thermo neutral and charge and there's a new sort of dark QC the. 286 00:41:28.020 --> 00:41:29.340 José Zurita: model building, if you want. 287 00:41:29.790 --> 00:41:31.980 Michael Albrow: Okay, good they're really. 288 00:41:32.040 --> 00:41:34.650 Michael Albrow: Not protons and snare accelerated the end of the. 289 00:41:35.670 --> 00:41:40.500 José Zurita: Day code, maybe mother was to come and model because the next question, so I let him comment. 290 00:41:42.210 --> 00:41:51.300 Matt Strassler: Well, I was just gonna I mean there's a there's a whole slew of different types of objects here, so I think there's no real one size fits all answer to. 291 00:41:51.690 --> 00:42:03.600 Matt Strassler: My question but generally these particles take a long time to annihilate because the amount of radiation compared to the masses so small so on the time scale that the speaker is worried about the annihilation, is not an issue. 292 00:42:05.160 --> 00:42:08.700 Matt Strassler: But, but I do think it's worth keeping in mind that, because they're all these different. 293 00:42:09.840 --> 00:42:18.750 Matt Strassler: types of objects that there are some risks with playing fitting in that you know that'll work for some models, but a lot of models won't. 294 00:42:19.170 --> 00:42:27.420 Matt Strassler: Whereas you haven't mentioned D dx which works for a wide classic models and I wonder whether you whether you're planning to sort of incorporate that. 295 00:42:28.020 --> 00:42:28.680 Nathan Suri Jr: Yes, I. 296 00:42:29.760 --> 00:42:30.060 Matt Strassler: yeah. 297 00:42:31.290 --> 00:42:34.950 Nathan Suri Jr: I didn't mention it, but that is a potential direction that we are looking into. 298 00:42:37.110 --> 00:42:37.470 Thanks. 299 00:42:39.630 --> 00:42:41.040 José Zurita: So Simon. 300 00:42:42.750 --> 00:42:50.550 Simon Knapen: yeah hey man just a commenting on the dx This is something that we were looking at the plane fitting back in the day, we did look at. 301 00:42:51.390 --> 00:43:03.840 Simon Knapen: But it wasn't as good as we thought it was going to be just because of the varying speed in the trajectories because you end up picking up the particle at a particular point and pick your velocity and so you get a really. 302 00:43:04.920 --> 00:43:19.680 Simon Knapen: Wide distribution for these things, at least for these sort of very broad trajectories and it didn't end up sticking out much i'm off the background now if the if the work is very narrow right so, then it should it should work very well. 303 00:43:23.040 --> 00:43:28.080 Simon Knapen: But that was just like a you know, a theorist level study back in the day, so it might be worth revisiting. 304 00:43:30.120 --> 00:43:30.690 makes sense. 305 00:43:31.980 --> 00:43:41.130 José Zurita: For the comment ice no further questions or comments or contacts, or we think Nathan again and we moved to a file. 306 00:43:46.140 --> 00:43:47.070 Rafał Masełek: Yes, Hello. 307 00:43:48.270 --> 00:43:52.800 José Zurita: hello, we see you the time penetrator share the slides. 308 00:43:56.070 --> 00:43:56.700 José Zurita: So. 309 00:43:58.380 --> 00:43:59.190 José Zurita: At words. 310 00:44:03.390 --> 00:44:06.870 José Zurita: And let's see if we can go one for what I want my work perfect. 311 00:44:07.170 --> 00:44:09.060 Rafał Masełek: So without further you see them changing. 312 00:44:09.540 --> 00:44:12.300 José Zurita: Yes, yes fantastic, so please go ahead and tell us. 313 00:44:12.330 --> 00:44:15.360 José Zurita: Everything about chat a little piece. 314 00:44:16.800 --> 00:44:18.870 José Zurita: They have been discussing immediately. 315 00:44:20.850 --> 00:44:21.300 Rafał Masełek: Yes. 316 00:44:22.410 --> 00:44:35.940 Rafał Masełek: So Hello everyone, my name is Thomas Eric i'm a PhD student at the university was so, and today I would like to present you the results of the recent study we did together Muhammad delta cash priyanka lumbar. 317 00:44:36.270 --> 00:44:41.730 Rafał Masełek: sinking so and kazuki saccharine if you'd be interested, then you can find the prepping and archives. 318 00:44:42.720 --> 00:44:50.100 Rafał Masełek: In our study we wanted to answer the question whether lps can be discovered that llc during grand three and Jaime case. 319 00:44:50.400 --> 00:45:07.320 Rafał Masełek: And we decided to concentrate on longest particles that are moved to be charged by multiple jobs, I mean that their electric that they are electrically charged and the magnitude of the charge can be up to several times magnitude of protons charge or electrons. 320 00:45:08.940 --> 00:45:15.960 Rafał Masełek: Now, in our study we recast it analyzes for three experiments atlas cms and metal. 321 00:45:17.160 --> 00:45:17.610 Rafał Masełek: and 322 00:45:18.630 --> 00:45:29.370 Rafał Masełek: We considered to production most up sorry both open and close China production, whereby close channel, I mean formation of petroleum like bounce states. 323 00:45:30.030 --> 00:45:47.550 Rafał Masełek: And we have the aimed at obtaining lower must bounce that these three experiments could provide and the at the end of day that they can do it, so there are multiple scenarios that predict existence of multiple charged particles and in some of them these particles can be long lived. 324 00:45:48.690 --> 00:45:50.640 Rafał Masełek: In our study we wanted to be. 325 00:45:51.600 --> 00:45:53.580 Rafał Masełek: very general model independent. 326 00:45:54.300 --> 00:46:10.020 Rafał Masełek: We considered particles with charges from one to eight times elementary charge that we're four types, so we considered particles with spin zero and half that were either close singlet or triplets they were always as you do, single it. 327 00:46:11.520 --> 00:46:32.970 Rafał Masełek: And we added them on top of the standard model, but since we wanted to stay as model, independent and general as possible we didn't like specify their how they will will decay, rather we treat them as collider stable in case of us and cms or we parameters, the decay length. 328 00:46:33.990 --> 00:46:41.370 Rafał Masełek: For metal, but how these particles can be produced well there are several processes, there is an s channel. 329 00:46:41.910 --> 00:46:54.540 Rafał Masełek: Julian production, there is a photon fusion for each channel or four point interaction vertex and in case of color trip at particles, we can also have a glue and glue on and gun module on fusion processes. 330 00:46:56.010 --> 00:47:15.000 Rafał Masełek: On the next slide you can see, the composition of cross section for an example particle called feminine with one TV mass here is on X axis, you can see charge of a particle on y axis cross section and from this blog you can see that wire for small charges, we can. 331 00:47:16.320 --> 00:47:17.700 Rafał Masełek: Go on vacation for. 332 00:47:18.720 --> 00:47:19.710 Rafał Masełek: and its dominant. 333 00:47:20.910 --> 00:47:29.070 Rafał Masełek: For larger magnitude of charge that fought on fusion and photon glue and processes become non neglected. 334 00:47:29.850 --> 00:47:37.230 Rafał Masełek: And I speak about it, because so far experimental searches interpret the results only for Julian processes, however, I. 335 00:47:37.620 --> 00:47:53.430 Rafał Masełek: had a very interesting talk by Mr Smith enough, two days ago about an ongoing atlas analyzes for the family akin to also photon for them fusion of the color singlet effect is also very. 336 00:47:54.960 --> 00:48:02.100 Rafał Masełek: Rarely on and gamma gamma is the green one like like this for highly charged part. 337 00:48:03.390 --> 00:48:10.200 Rafał Masełek: On the next slide you can see production costs section for all those four types of particles, I just want you to notice that. 338 00:48:11.850 --> 00:48:22.470 Rafał Masełek: And the production costs section increases significantly when we increase the charge in case of because this can mean orders of magnitude change. 339 00:48:23.880 --> 00:48:39.060 Rafał Masełek: Besides of I mean, in addition to considering pairs of particles particle antiparticle pairs produced that propagate for the detector we also considered formation of joining like bounce rates, because the made of those new part. 340 00:48:41.310 --> 00:48:48.900 Rafał Masełek: And we calculated this big production costs section for these using another relativistic approximation. 341 00:48:50.520 --> 00:49:02.610 Rafał Masełek: Potential within the shredding your equation, we were able to obtain hydrogen atom like solutions, then we use now with approximation to get construction to produce such bound state that dumb. 342 00:49:04.170 --> 00:49:12.060 Rafał Masełek: Since I have very limited time I will not explain in detail how we requested this analyzes I just want to say that for. 343 00:49:12.990 --> 00:49:36.840 Rafał Masełek: Open channels searches we use we based our study on analyzes by cms that look for large the dx for cross channel searches we based our analyzes on atlas resonance default on search and for, and we also did open channel searches for the middle experiment using our own simulation. 344 00:49:38.310 --> 00:49:42.870 Rafał Masełek: Now i'll show you the results, so the results of a form of two dimensional planes. 345 00:49:44.010 --> 00:49:51.270 Rafał Masełek: Is there is a charge of a particle and y axis, there is a mass of new particles scores want to look. 346 00:49:52.680 --> 00:50:01.800 Rafał Masełek: The experiments, will be able to provide at the end of data, taking period the Gray, the Gray, should be already. 347 00:50:02.970 --> 00:50:03.480 Rafał Masełek: Asking. 348 00:50:04.590 --> 00:50:05.580 Rafał Masełek: Around to data. 349 00:50:06.720 --> 00:50:07.290 Rafał Masełek: Now. 350 00:50:08.490 --> 00:50:25.500 Rafał Masełek: There are several curse the red curve is the open channels search I us and cms and, as you can see changes mother it with the charge the blue curve is they closed on a search, that is not due to low charges. 351 00:50:26.760 --> 00:50:29.700 Rafał Masełek: The for larger charges and the dominant one. 352 00:50:30.810 --> 00:50:39.420 Rafał Masełek: drinkers correspond to the middle experiment, it always increases with charge and Jenny provides immediate sensitivity you can because. 353 00:50:40.020 --> 00:50:54.030 Rafał Masełek: The most top one is responsible, detection of one event then two events events we can speak about such low numbers because medallia's background for experiment it's. 354 00:50:55.380 --> 00:51:01.710 Rafał Masełek: For those that maybe haven't heard about it it's a mostly passive detector located in. 355 00:51:03.240 --> 00:51:14.820 Rafał Masełek: Two meters away from intersection point eight, it was primarily designed to search for magnetic monopoles, but it can also detect Long live particles if they are highly organized. 356 00:51:16.170 --> 00:51:25.440 Rafał Masełek: So the next slide I provide you with results for colors colors on the left for run three on the ride for high Leumi and, as you can see. 357 00:51:26.880 --> 00:51:35.820 Rafał Masełek: On three four charges from one the large pbx searches are most dominant and for a larger charges, the. 358 00:51:37.110 --> 00:51:38.160 Rafał Masełek: search for different. 359 00:51:39.270 --> 00:51:55.680 Rafał Masełek: minute, and we can expect limits like 550 gv 4148 2.2 TV for high luminosity the limits grow to be 600 GB one and a 2.5 TV for such a. 360 00:51:56.760 --> 00:52:02.970 Rafał Masełek: Something that I think happens for intermediate values of charges from three six. 361 00:52:04.920 --> 00:52:19.710 Rafał Masełek: meadow becomes more sensitive than those not experiments like dms this is kind of surprising because medal is a small experiment and it will operate at 10 times lower luminosity than those. 362 00:52:21.090 --> 00:52:31.230 Rafał Masełek: However, medal is bigger than three so it does not suffer from increased diagram after going to hire me, and it can become here city. 363 00:52:32.340 --> 00:52:34.230 Rafał Masełek: Large experiments which is kind of interesting. 364 00:52:35.280 --> 00:52:47.670 Rafał Masełek: limits for the colors Amiens are stronger so uh for one week 950 gv during grand three and four charge a 2.3 TV. 365 00:52:49.290 --> 00:53:03.810 Rafał Masełek: For high luminosity for charge one, it should be about one TV and for charge eight point 16 and again, we see that for intermediate values that that becomes more sensitive than atlas and cms. 366 00:53:05.490 --> 00:53:09.180 Rafał Masełek: wire for called scholars limits are even stronger, so we have. 367 00:53:10.230 --> 00:53:28.230 Rafał Masełek: One TV 550 gv for touch one during at the end of run three and then or charge eight we have 2.6 TV and for high Leumi we one point 61 and for charge it we have 2.9 TV. 368 00:53:29.130 --> 00:53:48.690 Rafał Masełek: situation with medalist similar and finally colored females here the the bounce our strongest, so we can expect for charge one at the end of run three to TV and for charge eight, it would be 2.8 TV and for high luminosity. 369 00:53:49.980 --> 00:53:56.790 Rafał Masełek: expect over to TV for charge one and four charge 8.1 TV. 370 00:53:58.140 --> 00:54:00.060 Rafał Masełek: more sensitive atlas or. 371 00:54:01.170 --> 00:54:03.990 Rafał Masełek: In for charges from three to six. 372 00:54:05.010 --> 00:54:06.030 Rafał Masełek: So to conclude. 373 00:54:07.470 --> 00:54:28.830 Rafał Masełek: We can detect would it be charged heavy longleat particles at LSE for open and close john and searches and but, if we want to correctly interpret our findings, we need to include, we need to consider photon photon and photon gamma fusion processes to an appropriate PDF to calculate. 374 00:54:29.970 --> 00:54:40.410 Rafał Masełek: cross-section accurately now when it comes to large experiments like atlas and cms and generally open channels search they're more sensitive for charges from one to five. 375 00:54:40.770 --> 00:54:54.540 Rafał Masełek: wow for larger charges, the default on the resonance searches become more sensitive, and when it comes to meddle it provides completely different methods than atlas and cms because it's background free and passive. 376 00:54:55.560 --> 00:55:02.820 Rafał Masełek: And for around three it provides intermediate sensitivity for all charges, while what is interesting for high looming. 377 00:55:03.540 --> 00:55:16.170 Rafał Masełek: We expect that medal can become more sensitive than atlassian cms for intermediate value of charges from 360 because, mainly because it's begun to experiment. 378 00:55:16.770 --> 00:55:26.760 Rafał Masełek: And as you might have noticed, I showed you limits from those three analyzes I didn't show you like a combined limit and I think, none of the experiments. 379 00:55:28.110 --> 00:55:44.970 Rafał Masełek: Provided that but my I might be wrong i'm seeing something like a combined image from different searches open and close channel would be very, very interesting and before I finish just wanted to mention that there has been a very recent. 380 00:55:46.500 --> 00:56:08.460 Rafał Masełek: very recent resolved by atlas and you large the search was published in May and an access with 3.3 Sigma significance, has been observed that is interpreted as a longer article, there was a talk about it in discussion, two days ago at this workshop Thank you. 381 00:56:09.960 --> 00:56:15.510 José Zurita: Thank you very much for these nice dog and we open the floor for questions. 382 00:56:18.810 --> 00:56:22.230 José Zurita: Because, if not, I had to ask you okay Mike is going to say. 383 00:56:22.260 --> 00:56:23.250 José Zurita: yeah just go ahead. 384 00:56:23.430 --> 00:56:32.490 Michael Albrow: And such heavy high charged particles could affect D minus two of the nuances that been calculated or does a new on T minus to give limits on these particles. 385 00:56:34.560 --> 00:56:35.550 Rafał Masełek: You minus two. 386 00:56:38.130 --> 00:56:49.320 Michael Albrow: So any any charged particles, especially highly charged ones in the loop diagram can can affect too much to do, but probably is really heavy that would be. 387 00:56:50.490 --> 00:56:53.190 José Zurita: When simplify more than rights okay. 388 00:56:53.190 --> 00:57:04.410 Rafał Masełek: Yes, yes it's model it's model we wanted to be as general as possible, so we basically we only assume in our studies, the quantum numbers of particles. 389 00:57:06.270 --> 00:57:16.140 Rafał Masełek: And we've already there mass and we either collider stable or in case of metallica tries to be killing so that would be K depends, I think, on the concrete model. 390 00:57:17.220 --> 00:57:19.470 Rafał Masełek: We wanted instead give like. 391 00:57:20.580 --> 00:57:31.680 Rafał Masełek: A rough estimate what can be measured at around three latency and high Leumi then, if you have like a concrete model, you can kind of like know what to expect. 392 00:57:34.950 --> 00:57:35.340 Rafał Masełek: Does. 393 00:57:35.370 --> 00:57:37.050 Rafał Masełek: That answer your question or. 394 00:57:37.320 --> 00:57:43.380 Michael Albrow: yeah pretty well I guess yeah but I don't know if he's been calculated P minus to these things so. 395 00:57:43.440 --> 00:57:47.100 José Zurita: Maybe he wants to say something about this, or something different, I don't know. 396 00:57:48.570 --> 00:57:49.380 Albert De Roeck: something different. 397 00:57:49.800 --> 00:57:52.260 Albert De Roeck: Just as a follow up from. 398 00:57:53.910 --> 00:58:11.160 Albert De Roeck: The marketplace on the session, yes, we have a few days ago, we would metal be sensitive to what's possibly atlases seen the luminosity still low, but for for metal because we have only really. 399 00:58:12.900 --> 00:58:15.780 Albert De Roeck: As a signature when you see that you're. 400 00:58:19.440 --> 00:58:23.310 Rafał Masełek: In order for metal to be sensitive the particle has to be. 401 00:58:24.450 --> 00:58:34.350 Rafał Masełek: Really long lift it has to traverse at least two meters the detector is two meters away from 10 section point and it has to be highly organized now. 402 00:58:36.150 --> 00:58:36.720 Rafał Masełek: Maybe. 403 00:58:37.020 --> 00:58:40.140 Rafał Masełek: I will be teaching yeah. 404 00:58:42.000 --> 00:58:48.780 Rafał Masełek: Yes, I think it has a child, there is a chance, but like there's still ongoing discussion what actually. 405 00:58:50.280 --> 00:58:52.440 Rafał Masełek: Prejudice results this. 406 00:58:53.280 --> 00:58:53.670 thing. 407 00:58:55.260 --> 00:58:55.830 Albert De Roeck: That may. 408 00:58:58.500 --> 00:59:02.340 Albert De Roeck: Not that there will be people warmer, so in that probably you know. 409 00:59:06.810 --> 00:59:07.410 Rafał Masełek: Yes, yes. 410 00:59:07.500 --> 00:59:15.090 Rafał Masełek: you're right you're right you're right so yeah you're right so Okay, I have to. 411 00:59:16.680 --> 00:59:19.170 Albert De Roeck: look at it, maybe within the collaboration. 412 00:59:20.340 --> 00:59:24.060 Rafał Masełek: No actually I wanted to show you this this blood it's in the background. 413 00:59:25.140 --> 00:59:35.310 Rafał Masełek: Actually, actually alright so metal is sensitive, only to slowly moving particles, so if you this data suggests this particles like brown charge one or touch to. 414 00:59:37.800 --> 00:59:39.900 Rafał Masełek: touch to the particle has been low. 415 00:59:41.040 --> 00:59:45.930 Rafał Masełek: Not more than 30% of speed of light to be detectable at that not meddle. 416 00:59:47.070 --> 00:59:51.600 Rafał Masełek: So if their data suggests like a bit I could. 417 00:59:53.370 --> 00:59:55.740 Rafał Masełek: Also, this other measurement that's. 418 00:59:56.940 --> 01:00:00.510 Rafał Masełek: 0.6 if I remember correct then it's still like. 419 01:00:01.740 --> 01:00:03.030 Rafał Masełek: Beyond models which. 420 01:00:05.250 --> 01:00:05.820 Rafał Masełek: Now, has this. 421 01:00:08.580 --> 01:00:12.600 Rafał Masełek: property that it's sensitive only to slowly moving particles. 422 01:00:16.920 --> 01:00:24.390 José Zurita: Okay, thank you, thank you very much for this estimation, I think, for for more refined estimates, you can always use the matter most channel. 423 01:00:25.740 --> 01:00:44.460 José Zurita: But then I would like to close this session here because we have this know mass coming, and we can start on time at quarter to six seven time, so we think raffaella know the speakers on decision again on reconvene at 17 5045. 424 01:00:46.440 --> 01:00:46.890 Thank you.