Anonymous Questions and Answerable Topics
In the realm of physics research, the Anonymous Questions BFYS Workshop of 2008 sparked interest with thought-provoking inquiries on particle decays. Moving to 2019, the focus shifted to Answerable Questions, delving into topics like open charm mesons, invariant mass distributions, and the usage of Turbo in data processing. These questions not only challenge the boundaries of knowledge but also invite discussions on practicalities and technological advancements in the field.
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Anonymous Questions Bfys Workshop
History: 2008 Contest: each person asked their favorite research question Winner: Hella Snoek Question: If you add the Branching Fractions of all known ??decays you end up with 50%. Into what does the rest decay? Many questions submitted. Propose to make a web-page with answers! Here only time for short comments
2019: Anonymous Categories: Answerable Questions There is a clear answer to your question. May require some explaining from an expert . Can we suggestive Questions Yes, perhaps. But there may be boundary conditions that make it impossible Open Discussion Questions Answer may depend on opinion or priorities Closed or Suggestive Questions I really want this to be so Existential Questions More philosophical
Answerable Questions What does B to open charm mean? What is opened? Open charm is also called naked charm. A ? meson is called open charm because there is a net charm quantum number. ? ? is ? ? is closed Do we need to pay taxes when we're a year in Geneva? Let s take it offline, or online Tristan DuPree
Answerable Questions Why combinatorial background in an invariant mass distribution behaves exponentially? Rapidity and PTspectrum of produced particles Can we build a second LHCb detector in the other direction? Practicalities: Cavern, Money What does it bring extra?
Answerable Questions Can you elaborate Turbo? It s easy to find what it technically is, but what analyses use it? How much data is processed by Turbo and how much the regular way. Are they / can they be combined? Reduced data. Reco objects on demand . In Run-2 about 25% of rate but 10% of bandwidth In Run-3 planned ~70% Why is it okay to skip offline reconstruction and rely on trigger reconstruction? Tja . Perhaps insist at least on re-fitting possibility of events
Answerable Questions The removal of the L0 trigger is quite intriguing to me. If I look at slides about it, it seems every event (~30MHz) gets fully reconstructed. How is this possible? Can anyone further explain this? Lots of computers, parallel coding, optimizing, hard work, Are we going to expand our corridor by conquering the Xenon corridor? Probably not Who can go to LHCb week in Oxford? Anyone making an important contribution to the meeting
Answerable Questions Is British English the LHCb standard? Why? I think it's more beautiful anyway There have been discussions. Patrick? What accent does Conor Fitzpatrick have? It's the best accent ever He s called Conor; what do you think? Tell him. What comes after the Vici grant? ERC advanced, Spinoza prize, Nobel prize, Midlife crisis?
Answerable Questions What do you do with this ONE *** subjob out of 500 subjobs in ganga that keeps on failing? Get professinal help Can we run ganga from Stoomboot? Ehhh ? How do the 3 dipole magnets compensate the impact of the spectrometer magnet on the trajectory of the LHC beams? Ehhh...?
Answerable Limit Questions What is ultimately the limiting systematic uncertainty in the electron efficiency?" Maarten ? What is ultimately the limiting systematic uncertainty in the muon efficiency? Ehh ? What is the limit in mass resolution in lhcb? Depends on: # final state, hit resolution, in trackers, #scattering For two-track final state check thesis of Jacopo and/or Amoraal
Answerable Limit Questions What is the limiting factor in the momentum resolution for Long tracks for the run-3 detector? (The answer probably depends on the track momentum, but consider that we are mainly interested in B and D mass resolution.) Is it the velo hit resolution, UT, or FT? Or is it rather the contribution of multiple scattering? Indeed depends on ? of the ?. Alternative question: do we understand the ??/? resolution curve?
Note: Design Motivations for the Tracking System Here is a link to a presentation with motivations why the spectrometer is designed as it actually is: http://indico.cern.ch/event/180835/contribution/1/attach ments/241534/338130/TrackingExperience.pptx
Can we Suggestive Questions Can we use the old Velo in the exhibition during run-3 as a separate (silicon only) detector? Maybe with a magnet around it? Pragmatic answer: Where? There is no other LHC interaction point. What could it be used for? As a small long-lived particle detector?
Can we Suggestive Questions Can we use the histograms of the lifetime of prompt ?/? or prompt ??to make the data manager shifters monitor the bias of the measured lifetime during data taking or use them in the alignment? Probably not ;-) ?? Can we do Flavour tagging with CEP? Only for CEP events ? Can we get money from Elon Musk? Ask him.
Can we Suggestive Questions Can we fill the magnet with a target and do capture cross section with low momentum particles that pass through RICH-1? (e.g. protons, kaons, pions, muons? ???
Open Discussion Questions What is the most interesting thing expected to come out of the upgraded LHCb detector? What do you think? What s the most interesting question ;-) ? How much can we improve flavour tagging during run 3? Good one! Can we (LHCb) say something about the Higgs? In ?? ?+? it is difficult
Open Discussion Questions An important uncertainty in lifetime and mixing frequency measurements is the length scale of the VELO. Does anybody have an original idea of how we could measure it? How does the uncertainty on the VELO sensor Z position affect the measurements of delta ms and lifetimes? Niels See discussion Niels How to make a parametrization of the magnetic field that is both more accurate and faster than the current grid interpolation (which doesn't quite obey the Maxwell equations)? Ideas exist.
Open Discussion Questions Would LHCb be able to reconstruct long-lived particles decaying i.e. after the magnet (so we have to use only the muon detectors, and maybe the calorimeter)? The idea is basically to understand if we could make use of our forwardness to (partially) reconstruct very long lived particles. This is challenging. You can figure out who is proposing this crazy idea :) Requires a study with T-tracks. Yes, it s a challenge: try it!
Open Discussion Questions Can ATLAS/CMS do proton/K/pi separation with their planned TOF detectors? If so, is LHCb still a competitive B physics experiment after LS3? How will bfys survive in a CLIC era? Tera-Z factory, Other machines, Super-LHCb? What proposed next big accelerator is most in favour of flavour physics? Perhaps Tera-Z??
Closed Questions Is Br an bfys? No, he is not here. Does Daniel live in a castle? No, I ve seen his salary Does Katya own Hilbrand as a slave? No, Gerhard is.
Suggestive questions formulated as an open one Cas asks: Do you think machine learning will become more prevalent in reconstructing events or cleaning up pileup from events? It is generally difficult to tell what such a Neural Network is learning; could you live with it working but not knowing exactly how it works? It is being used as such Is machine learning a useful tool for LHCb, or an overhyped buzzword? It s certainly useful
Daniel Questions What is Daniel s favorite whiskey? Whiskey?? Whisky!! Where does Daniel buy all his shirts? Ask him if you want them too Can Daniel be the new actor for Chewbacca? He is the original one. Can we clone Daniel to save the world? No, he has time enough since he s no longer in Star Wars Should Daniel be the next James Bond? No, he s too busy saving the world
Existential Questions "Do you think we have a free will? If we don t, we re probably not designed to find out If we do, we should be smart enough to find out So the only answer we can give is yes? Well, I do. You decide for yourself ;-) When will Roman return? Hadronic or leptopic? When will the small LHCb keychains come back?
Existential Questions In the early universe about 109photons remained for 1 baryon (radiation dominated universe). At present 4% of the energy density of the universe is baryons (matter dominated universe), and about 10-4 is radiation. Baryon number is conserved, and energy is conserved, so where did the energy go that was contained in the radiation? How can the ratio have changed so much? Radiation cooling due to expansion Baryon number not always conserved (sphalerons)
Existential Questions Why are we doing particle physics? Does our findings help humankind in ANY way? Let s discuss! Cynical answer: Yes, since we don t do damage elsewhere. Why 42? Exactly!