 Hi everybody, let me begin this video with an apology. So I was supposed to give a talk I was scheduled to give a talk at the fall meeting of the division of nuclear physics for the American Physical Society I got an email on August 31st saying hey, congratulations. You're abstracts been accepted do these things to confirm your talk I didn't see the email. So the ultimate fault in all of this lays in me As a result of not seeing that email I didn't know that I'd been scheduled to speak on a Saturday on Halloween and I found out 30 minutes before my talk From a colleague of mine in the session. Hey, are you good to give your talk and of course I panicked So this is the talk that I would have given to my colleagues at that meeting Please don't take the fact that I didn't show up for my talk as a sign of disrespect for the nuclear physics community I actually because I'm so interested in particular in the electron-ion collider I obviously have a huge amount of respect for my colleagues in the nuclear physics community You can just chalk this up to me being really dumb at handling email and we can just move on from there, hopefully All right, so in that spirit what I'm gonna do now is I'm going to switch over This is the talk that I would have given at the DNP fall meeting I've timed it out for 10 minutes and I'm gonna start the clock in a moment And we'll go ahead and get started. So again, my apologies Let's take a look at some physics and see what things we might be able to do with the electron-ion collider in the future So in this talk, I will talk a little bit about charm jets as a probe for strangeness at the future electron-ion collider and As I like to begin all my talks I'd like to thank the organizers for this opportunity which I've squandered To talk a little bit more about some recent work that my colleagues and I have been doing looking at this very subject So with that in mind, let's go ahead and move to the outline I'm going to talk a little bit about our baseline electron-ion collider detector implementation We're using the Delfts fast simulation framework to do this work I'll talk a little bit about the physics process We're interested in studying and then the Experimental approach we're taking to isolating that process and then talk a little bit about how that can help us to probe The degree of strange-court contribution to the proton at a future electron-ion collider program And I'll offer some conclusions and outlook at the end So first let me talk a little bit about the baseline EIC detector implementation that we have made in the Delfts framework Now as you would know from the rest of this mini symposium here at the DNP fall meeting The electron-ion collider will be able to collide electrons and positrons on protons And of course heavy ions as well. We've selected a beam configuration 10 jev for the electrons and 275 jev for the protons which is believed now based on the hard work that's going on by the accelerator community in developing this Accelerator program to yield one of the highest instantaneous luminosities And so therefore we can rapidly integrate data and in one year we would expect to take about a hundred inverse femtobarns of data Okay, so for the students here. I've got a little explanation about what 100 inverse femtobarne means But basically if we have a cross-section process with a cross-section of 15 picobarne and we have a hundred inverse femtobarns of data We would expect about one and a half million events to be provided by the collider Now we have to detect them and reconstruct them and use them in analysis And what we're going to do is study intrinsic strange and charm in the proton in the nucleus I'm going to focus on strange in this talk to try to improve our understanding in particular of the strange part on distribution function And maybe ultimately we can get at things like the strangeness holicity contribution to the proton And this work is available in a paper that has been submitted to physical review D. So this is a baseline EIC detector It's got all the standard configurations, but because this is not a symmetric collider There's one side where the beam electron will tend to scatter and that's the electron end cap And then there's one side where the hadron remnants will tend to scatter from the ion or proton being interacted with That's the hadron end cap and then in between there's a barrel region that has to cap Capture the overlay of those sort of two halves of the events. So of course we expect to have a high Quality particle charge particle tracking covering a wide range of angles with sort of you know 85% to 98% efficiency depending on the last sort of 20 to 25 years of tracking detector development with about a 20 micron resolution In things like the impact parameters of those tracks An electromagnetic calorimeter covering a wide range of angle as well as important with good energy resolution and in this Work we would of course you can take a look at our paper But we basically advocate for a hadronic calorimeter as well with good granularity that covers the same region as the electromagnetic calorimeter and And gives us a good energy resolution so that we for can for instance do a reliable calibration of jets Now let's talk a little bit about the physics process of interest The physics process of interest is shown here in the left-hand side diagram This is the leading contribution of intrinsic strangeness in the proton where you get a strange anti-strange Quark that pops out of it into existence just as it's interacted With by a W boson emitted by the beam electron This then converts the flavor of the anti-strange quark to an anti charm quark and it with high enough energy We would expect then a jet of hadrons to be produced and for that jet to be consistent with having come from a heavy Long-lived hadron like those created by charm quarks now We've simulated this using pithia 8 and we find the cross-section predicted for a q squared or greater than 100 jev Squared to be about 15 picobarn. So that's the kind of hint process I hinted at earlier now the middle and right diagrams which involve intrinsic charm and also Gluon splitting to charm and these are entangled together inside the proton. They're very important These will also lead to the production of for instance charm jets But the the trick here is that the pithia 8 framework doesn't simulate these and we're ignoring them for now in this study They would lead to increased production of charm jets So by ignoring them we're effectively conservatively Underestimating our charm jet yield at the end of this analysis That said these diagrams would need to be disentangled from one another in any future EIC based analysis All right, so what do we find at the generator level? Well, this is a distribution of the As a function of transverse momentum the differential cross-section for producing the charm jets and all jets in red And as you can see here the charm jets are preferentially produced at fairly low transverse momentum That's where the largest relative rate of charm to all jets is actually located coming in at about three to four percent The charm jets are produced at relatively low angle to the the proton beam in this case They peak around 30 degrees, but they have a wide range when they make a jet We have jets of r equals one that we're using to do this study So we we use this to motivate not only good calorimeter coverage, but good tracking angular coverage We need to catch all the stuff inside of those large radius jets so that we can flavor tag Now speaking of flavor tagging identifying these charm jets is obviously a crucial ingredient in this work And you can see that illustrated here Delfts has a very nice event display built into it And this is in fact a charged current interaction producing a charm quark Through this flavor changing process We've got missing transverse energy of about 25 GeV from the conversion of the electron into a neutrino the jet PT is about 25 GeV so this is a rather high-energy charm jet and This is at pseudo rapidity of 1.6 and you can see here within the yellow jet Region that's been reconstructed. There are a couple of displaced vertices that would be consistent with coming from a long-lived charm Had drawn and that's what we want to get and we capture those kinds of jets with those displaced decays By using a very simplistic approach This is basically looking for displaced tracks from the interaction point and counting them All right, so we use the sign 3d impact parameter and we simply count the number of such displaced tracks that we find we Optimize the hyperparameters in this approach by minimizing the uncertainty on the final expected light jet subtracted charm Yield in this case So we're aiming for minimum uncertainty on the charm yield at the end after background subtraction and you can see here Why this is so effective? Charm jets tend to have a very high positive side SIP 3d value Whereas light jets these distributions are relatively symmetric and fall off quickly around zero, okay? So track counting efficiency on charm or light jets ranges from averages of about 20 percent Okay, that's for the charm jets and point four percent. That's for the light jets So that's the background that we have to subtract and we've optimized this by then effectively subtracting that background in the analysis With the kinds of conditions in this analysis We would expect this to yield about six thousand fully reconstructed charm jet bearing events Something in that ballpark at the end of a hundred and inverse of data taking about one year All right, so how does this probe strangeness in the proton? Well, the constraints on the strange court contributions to the proton do range over a wide area Based on PDF fits that have been done over the last few decades. So for instance in the CT 18 framework There are some fits to data sets that prefer a rather high enhanced Strangeness in the proton maybe an RS of about point eight six three Or others that allow a really suppressed amount of strangeness in the proton Maybe around point three two five and we use these two bookends as the sort of range of variation Of strangeness in the proton to see whether or not we could actually see the difference between these two levels of Intrinsic strangeness in the proton just by counting charm tag jets and in fact we can so in gray here as a function of reconstructed jet PT you have the relative uncertainty on the reconstructed charm jet yield after background subtraction at the end of the analysis and then in blue you have the corresponding amount of Variation relative to the suppressed strangeness scenario that you get in the enhanced strangeness scenario And there is clear daylight between those two distributions in this analysis It's extremely clear that that with an EIC detector with all the conservative assumptions We've made so far There's a lot of promise in being able to tell the difference between a very suppressed scenario for strangeness in the proton and a very Enhanced scenario for strangeness in the proton and something that lies in between should be readily accessible at the EIC with Even a very baseline detector design Again, and you know, we emphasize the need to be able to reconstruct jets at low angle with what large radius parameters And so to be able to calibrate those jets we would we would emphasize calorimetry and tracking in the design of a future EIC detector All right, so let me offer some conclusions and outlook So we did a lot of things in the paper I didn't talk about here like varying detector resolution to see what it does to flavor tagging and employing particle ID Algorithms or some future expected particle ID approach in order to also isolate single Particles within jets as a sign of heavy flavor. I didn't cover that here But you can take a look at the paper or you can ask me questions about it afterward There's lots of directions we can go in with full secondary vertex reconstruction jet substructure and flavor tagging and more realistic Particle ID implementations and of course I urge you to take a look at this We're very excited about the potential in the future as we continue to develop these studies for understanding more about intrinsic Stringes in the proton. Thank you very much