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Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC

The ATLAS Collaboration

2012 · arXiv

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A search for the Standard Model Higgs boson in proton-proton collisions with the ATLAS detector at the LHC is presented. The datasets used correspond to integrated luminosities of approximately 4.8 fb^-1 collected at sqrt(s) = 7 TeV in 2011 and 5.8 fb^-1 at sqrt(s) = 8 TeV in 2012. Individual searches in the channels H->ZZ^(*)->llll, H->gamma gamma and H->WW->e nu mu nu in the 8 TeV data are combined with previously published results of searches for H->ZZ^(*), WW^(*), bbbar and tau^+tau^- in the 7 TeV data and results from improved analyses of the H->ZZ^(*)->llll and H->gamma gamma channels in the 7 TeV data. Clear evidence for the production of a neutral boson with a measured mass of 126.0 +/- 0.4(stat) +/- 0.4(sys) GeV is presented. This observation, which has a significance of 5.9 standard deviations, corresponding to a background fluctuation probability of 1.7x10^-9, is compatible with the production and decay of the Standard Model Higgs boson.

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6 selected excerpts · 6 total mentions

godelski
Neutral mention · rule
> physics tends to be much more reproducible than biology, and CS doubly-so. With physics I think there is a better culture of reproduction, but that is, I believe, due more to culture. That it is acceptable to "be slow". There's a high stress on being methodical and extremely precise. The prestige is built on making your work bulletproof, and so you're really encouraged to help others reproduce your work as it strengthens it. You're also encouraged to analyze in detail and to faithfully reproduce, because finding cracks also yields prestige. I don't know if it's the money, but no one is in it for the money. Physics sure is a lot harder than anything else I've done and…
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it pays like shit. For CS the problem is wildly different. It should be easy to reproduce as code is trivial to copy. Ignoring the issue of not publishing code alongside results, there's also often subtle things that can make or break works. I've found many times in replication efforts that the success can rely on a single line that essentially comes form a work that was the reference to a reference of the work I'm trying to reproduce. The problem here is honestly more of laziness. In contrast to physics there's an extreme need for speed. In physics (like everyone else I knew) I often felt like I was not smart enough, and that encouraged people to dive deeper and keep improving or to give up. In CS (like everyone else I knew) I often felt like I was not fast enough, and that encouraged people to chase sponsorships from labs that provided more compute, it encouraged a "shotgun" approach (try everything), or for people to give up (aka "GPU poor"). The reason I'm saying this is because I think it is important to understand the different cultures and how replication efforts differ. In physics a replication failure was often assumed to be due to a lack of intelligence. In CS a replication effort is seen as a waste of time. Both are failures of the scientific process. Science is intended to be self-correcting. Replication is one means of this, but at its heart is the pursuit of counterfactual models. This gives us ways to validate, or invalidate, models through means other than direct replication. You can pursue the consequences of the results if you are unable to pursue the replication itself. This is almost always a good path to follow as it is the same one that leads to the extension and improvement of understanding. There's a lot I agree and disagree with from Dr Bissell's article. Our perspectives may differ due to our different fields, but I do think it also serves as some a point of collaboration, if not on the subject of meta-science. Biology is not unique in having expensive experiments. I want to point out two famous and large physics projects: the LHC's discovery of the Higgs Boson[0] and LIGO's Observation of a Gravitational Wave[1]. The former has 9 full pages of authors (IIRC over 200) while the latter has about 3. These works are both too expensive to replicate while also demonstrating replication. Certainly we aren't going to take another 2 decades to build another CERN and replicate the experiments. But there's an easy to miss question that might also make apparent the existence of replication: who is qualified to review the paper and is not already an author of it? There's definitely some, but it really isn't that many. In these mega projects (and there are plenty more examples) the replication is done through collaboration. Independent teams examine the instruments that make the measurements. Independent teams make measurements, using the same device or different devices (ATLAS isn't the only detector at CERN), different teams independently analyze and process the information, and different teams model and simulate them. With LIGO this is also true. It would be impossible to locate those black holes without at least 2 facilities: one in Hanford (Washington) and the other in Livingston (Louisiana) (and now there's even more facilities). Astrophysics has a long history of this type of replication/collaboration as one team will announce an observation and it is a request for other observations. Observations that often were already made! In HEP (high energy particle physics) this may be less direct, but you'll notice other particle physics labs are in the author list of[0]. That's because despite the exact experiment not being replicatable in other facilities, there are still other experiments done. In the effort to find the Higgs there were many collisions performed at Fermi Lab. I don't think this same in biophysics, but I think there are nuggets that may be fruitful. Bissell mentions at the end of her argument that she believes replication might have higher success were labs to send scientists to the original labs. I fully agree! That would follow the practice we see in these mega experiments in physics. But I also do think she's brushing off an important factor: it is far quicker and cheaper to replicate works than it is to produce them. You're a scientist, you know how the vast majority of time (and usually the vast majority of money) is "wasted" in failures (it'd be naive to call it waste). Much of this goes away with replication efforts. The greater the collaboration the greater the reduction in time and money. And I do agree with Bissell in that we probably shouldn't replicate everything[2]. At least if we want to optimize our progress. But also I want to stress that there is no perfect system and there are many roadblocks to progress. Frankly, I'd argue that we waste far more time in things like grant writing and publication revisions. I don't know a single scientist who hasn't had a work rejected due to reviewers either not giving the work enough care or simply because they were unqualified (often working in a different niche so don't understand the minutia of the problem). As for the grant writings, I think they're a necessary evil but I'm also a firm believer of what Mervin Kelly (former director of Bell Labs) said when asked how you manage a bunch of geniuses: "you don't"[3]. You're a scientist, an expert in your domain. You already know what directions to look in. You've only gotten this far because you've been honing that skill. We don't have infinite money, so of course we have to have some bar, but we can already sniff out promising directions and we're much better at sniffing out fraud. Science has been designed to be self-correcting. [More of a side note] > Usually the answer is, "if you're a good researcher and can't reproduce my work, you come to my lab and reproduce it there" because the variables that affect this are usually things in the lab- the temperature, the reagents, the handling. And we should not undermine the importance of these variables. Failures based on them are still informative. They still inform us about the underlying causal structure that leads to success. If these variables were not specified in the paper, then a replication failure shows the mistake of the writing. Alternatively a failure can bound these variables, by making them more explicit. I'm no expert in biophysics, but I'm fairly certain that understanding the bounds of the solution space is important for understanding how the processes actually work. [0] https://arxiv.org/abs/1207.7214 [1] https://arxiv.org/abs/1602.03837 [2] I also would be very cautious about paid replication efforts. I am strongly against it as well as paywalls on publishing (both in creation of publication as well as the access of). [3] https://1517.substack.com/p/why-bell-labs-worked
t_mann
Neutral mention · rule
Here's 8 densely printed pages of contributors to a discovery that lead to a Nobel prize: https://arxiv.org/pdf/1207.7214#page=26 Guess how many of them were included in the prize. It's a shame that the Nobel committee shies away from awarding it to institutions, but the AlphaFold prize doesn't even make the top 10 in a list of most controversial omissions from a Nobel prize. It's a simple case of lab director gets the most credit.
losvedir
Neutral mention · rule
That's a good question. You're right that a random grad student in a lab can't replicate, e.g., the discovery of the Higgs boson! However, at least for the Higgs (and I believe this is standard for most such large experiments), there were actually two different groups using two different apparatuses, both at CERN. There was the CMS[0] detector and ATLAS[1] detector, used and analyzed by two different groups of physicists, resulting in two papers[2,3], published on the same day. [0] https://en.wikipedia.org/wiki/Compact_Muon_Solenoid [1] https://en.wikipedia.org/wiki/ATLAS_experiment [2] https://arxiv.org/abs/1207.7235 [3] https://arxiv.org/abs/1207.7214
particleguy
Neutral mention · rule
>> ArXiv pre-prints are pretty normal in physics and math. Correct, and they are usually followed up by a published, peer-reviewed paper as well. I look forward to the day this one also gets reviewed and published. Higgs boson discovery pre-print: https://arxiv.org/abs/1207.7214 Higgs boson discovery paper: https://www.sciencedirect.com/science/article/pii/S037026931... It's essentially the same text. >> BTW, Krasznahorkay is a highly-cited researchers. Great
jsprogrammer
Neutral mention · rule
Here is one paper: http://arxiv.org/pdf/1207.7214v2.pdf Look at Figures 8 and 9. They show the p-value (at whatever level of data was collected when the paper was written) over the parameter space that is being searched. You can see that the values observed have a clear separation -- most are close to 1 (null-hypothesis holds) with just one significant dip towards 0 (null-hypothesis doesn't hold). If you were to animate this graph with the p-values over time (as more observations are made), you would see the trend towards 0 or 1 much clearer. The Boson experimenters would expect a (1 - p) reproduction rate for the next observation made (if the null-hypothesis holds). That…
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is, the next observation has a p probability of fitting within the parameters of the null-hypothesis and (1-p) probability that it is inconsistent with the null-hypothesis. Why would they expect that? Because the math involved in telling you whether or not that is what you should expect is exactly what p-value calculates (again, assuming a well-formed experiement -- which the Higgs experiments probably are). But again, when the null-hypothesis doesn't hold, p-value tells you very little (it's actually undefined in the math).
godelski
Neutral mention · rule
The LHC has multiple teams that will replicate an experiment. The facility is so big that you have different groups. You also have different detectors (such as ATLAS and CMS) where you replicate the experiments because each one has a bit of difference. And except for the very high energy stuff, other labs around the world can reproduce the results. Not to mention that particle physics has a 5 sigma significance threshold... But for a lot of this, what happens is that they make the claim, they contact peers, send out the data, and have their peers confirm. You ever wonder why experiments like these have hundreds of authors[0,1]? That's because that shit is peer review. [0]…
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has literally 8 pages of authors, which is in the format of first initial, last name. There's also 5 pages of university/lab affiliations. Everything you're talking about here is done outside journals. And guess what, there are two versions of the arxiv work for [0], July 31st 2012 and August 31st 20122. Guess when it was "published". September 17th of that year. The announcement? July 4th! Btw, the journal is showing v2. This is how big science is done. The replication and verification is happening intra-paper. You of course have to trust the machine, but that's true for everyone and a limit that can't be bypassed until a later date when a new one is built. Which frequently the first tasks are to confirm other observations, such as the JWST confirming exoplanets that were previously observed. So to sum up: Replication happens, on big important experiments, outside journals > [reproduction] is extreme reductionism I'd still argue, with _aavaa_, that reproduction is the only currency that matters. Your experiment isn't worth shit if it can't be reproduced (i.e. it is indistinguishable from fraud) > LHC results cannot be replicated Most of the work is replicated, prior to publication. > JWST cannot be replicated. Observational data is confirmed. And JWST replicates its predecessors (an important part of its mission). (I'll even add LIGO in here and repeat the LHC and JWST comments) > You know who will be able to tell you if the experiment description makes sense and has chances to be replicated if you ask them? Peers. Everyone agrees with this. We are just saying the reviewers aren't necessarily your peers and the people you should be asking. > because nobody likes to do peer review. Lots of people like to do peer review and it happens all the time. If you're talking about reviewing for a journal, then yes I agree with you. But if you're talking about replicating work, building on, doing it to learn, or for fun, then this happens all the time. In fact, grad students do this professionally. How many works did you rebuild and try to replicate? > I'm yet to see any proposal for peer review without editorial invitations which has at least theoretical chances to succeed. You haven't dismissed __aavaa__ or my claims, only asserted they are wrong. If you would like to say why we are wrong, we're clearly open to hearing it and responding. But you've just asked us to trust you. > So you do mean "reproduction", not "replication". Reproduction is a form of replication. Replication is a spectrum. Reproduction is the minimum and with a lot between confirming experiments within a different context frame. But I don't think anyone is saying that just running your code constitutes reproduction. I'd say it is confirmation of your code. The source availability is about verification, as in I can probe it and look for errors, not so much reproduction. [0] page 25 https://arxiv.org/abs/1207.7214 [1] appendix C page 41 https://arxiv.org/abs/2207.00043

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