notes and stuff about Lia’s work at LHC. Reverse cron.
2022-07-21: – sent via Messenger:
lia f:
“Ask away your questions! I’ll try my best to answer.”
Heh-heh… be careful… that’s a firehose you might regret turning on…
OK, so a few ?s related to the new discoveries::
Seems a bit sus that results (3 “new” particles, a tetra- and two pentaquarks) came rather quickly after this run started; I thought it took a lot of run time and then massive compute time to determine findings. How so fast?
I say “new” particles, but aren’t these just new combinations of quarks and /quarks? Maybe even expected? Which might explain how fast they were detected (if you know where the needle is. or even certainty that a needle exists in the haystack, it’s much easier to find?)
Since pentaquarks can only be produced in machines like LHC (and maybe? supernovae), will we need a bigger machine to make hexaquarks, septaquarks, and further? Octoquark has a nice ring to it.
If this schedule is correct, looks like you folks are pretty good at keeping to a plan. Must be one hell of a “here’s how to start up LHC” manual (which I would dearly love to read!).
Enough for now. Please take your time responding. I always worry I’m taking too much time from people that have more important work to do. If there are existing resources that explain these things, point me to them. To give you a sense of what I enjoy reading , I read your paper “For positioning electrodes in the ATLAS…” (and have questions 😁) and am starting on this one soon: https://arxiv.org/pdf/1801.09721.pdf. I don’t claim to understand most of this stuff, and I skip over the math, but I sure like reading it. 🙂
2022-07-12 – from Messenger:
Hi Cedric,
Yes it is convenient!
Honestly folks in different fields are pretty siloed. So they get along but often just don’t interact! That said, loads of folks are stoked about the Webb telescope pictures right now. It’s exciting!
Yes, the collider was turned off for maintenance for the last 3ish years. Last week it was turned back on, with lots of upgrades to it and to the experiments, including the upgrade project I was a part of.
Ask away your questions! I’ll try my best to answer.
You’re not the only one to be glad we didn’t “divide by zero.” There are some horrible misinformation videos going around. I truly wonder what compels people to believe they know enough about something to make a video on it and share it with the world. Not that I blame folks for not knowing what goes on at cern. Overall our science communication efforts are poor and there is so much jargon.
2022-07-12 – to Lia via Messwenger:
Hi Lia! Is this a convenient way to communicate? My email speed is a tad slow, so I thought I might try this.
II was wondering…. do collider folks generally get along with telescope crews? You guys made some news last week (and I do have some questions about that…), but looks like today’s all about the the telescope jockies.
I have this idea for a cartoon… the first pics from JWST will look like the view from inside ATLAS or LHCb. Some sort of wrap-around view, like looking at the back our your head. But I lack the artistic ability to express it.
Just happy your guys didn’t cause some weird “divide by 0” event when spinning that machine up recently. 😜
Cheers!
2022-07-11 – notes while reading of the new particles from the start of run2?
lia formanti: atlas is breaking the rule of acronyms by using the last letter of apparatuS?
also, “new” particles or new combinations of know particles?
also, seems like a quick response after just starting the 3rd run. doesn’t this stuff require gobs of compute time to tease out the resdults?
telescopes keep getting bigger and seeing deeper/further/mnore distant p[ast, while colliders are seeing smaler and smaller.
i wonder if the jwst will show pics of the lhc and vioce versa?
or jwst will see the back of our heads?
i have an idea for a cartonnn on this, but nop idea hopw to make it.
these new tetra and penmta quarks are new cominations of quarks; penta and tetraquarrks arwe known, just not in these combinatiopns
B meson -> charm + /charm + up + down + strange (first penta with a strange)
?what decayed??? -> “doubly electrically charged tetraquark” , charm + /strange + up + /down
and scientists also observed its neutral pair.
also, tell someone to stop using bueaty and bottom for the same quark. shit’s confuising enbough without one of the 6 quarkshaving 2 names
2022-05-21: notes while reading Lia’s paper “For positioning electrodes in the ATLAS experiment’s New Small Wheels using detector characterization techniques”
lia formenti: love the unit “barns”
pg 7; link goes to fig 2.1, should go to 2.2
did they achieve the expected increase in luminosity (~156 ->3000fb-1), or too early to tell? need run tun 4,5 to complete?
pg 30 ” The muon flux is also terribly convenient for
testing muon detectors.”
har har
in 5.4.1, how do you determine if data is corrupted?
5.7: ” In fact, cosmic muon testing is the
only characterization technique where the entire surface of quadruplet layers can be probed
since muons hits are distributed almost uniformly; the CMM [7] and x-ray methods [8] depend
on measurements at reference points, and test beams only have a limited beam spot to work
with [6]. “
neat!
