Tuesday, February 17, 2015

ATLAS, CMS: small SUSY deviations

Both ATLAS and CMS, the two main detectors at the Large Hadron Collider, published some preprints about the search for SUSY or new SUSY-like Higgs bosons. No formidable deviation from the Standard Model was found. However...

ATLAS was looking for a CP-odd Higgs boson, \(A\), in decays to \(Zh\). It turned out that there is approximately a 2.5-sigma excess for \(m_A=220\GeV\): look in the conclusions. I won't seriously mention the below-2-sigma excess for \(m_A=260\GeV\) at all.




If you search through the whole Internet and all YouTube videos for a prediction of new Higgs bosons near \(220\GeV\), or below \(230\GeV\) ;-), you will be led to this 2012 blog post about a talk by Nima Arkani-Hamed. After 59:00, he talks about some possible looming proofs of naturalness. In his special NMSSM scenario, he says that some data would imply that the new Higgs doublet below \(230\GeV\) is unavoidable.




CMS was employing the MT2 variable to look for superpartners. In the PDF file, find "Figure 12" on page 23 (the number shown on the paper: it's 25 according to PDF viewers).

Among the three exclusion charts over there, the stop-neutralino plot at the bottom indicates that they expected the exclusion of stops up to \(m_{\tilde t}=(700\pm 100)\GeV\) or so but they only got an exclusion \(m_{\tilde t}\lt 500\GeV\) in that lower part of the graph which is about 2 experimental standard deviations below the expectations.

They say that you should ignore this apparent excess altogether because, as they think, it's caused by a downward fluke in the control sample, not an upward fluke in the signal region. I wonder whether they couldn't use more accurate predictions for the background (not necessarily a control sample) to avoid similar explanations that sound as excuses.

Nothing to be enthusiastic about but 2-sigmaish anomalies keep on occurring at a rate that is so far comparable to what statistics predicts.

It is not guaranteed that the LHC will be enough to discover supersymmetry but there is no crisis for SUSY. If you doubt that this assertion is right while the critics of SUSY who contradict it are wrong, check the first hep-ph paper today which contains these two assertions in the very title ;-), along with the information that supergravity gauge theories strike back.

54 comments:

  1. Physics assumes the vacuum is exactly mirror- symmetric toward matter. Theory then becomes elegant but observation stops exactly working. Physics should observe measurable empirical falsification of vacuum mirror symmetry toward matter. Euclid's triangles were elegant, Bolyai's triangles were more useful.

    A good idea need only be testable. It is believable afterward.

    DOI: 10.5281/zenodo.15107
    DOI: 10.5281/zenodo.15439
    DOI: 10.5281/zenodo.15441
    DOI: 10.5281/zenodo.15445
    Also contains links to the first three.

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  2. I have never met a jew who was not open to non-jews. I have been warmly welcomed to numerous bar mitzvahs, bat mitzvahs, seders and other jewish ceremonies and have found, on the average, jewish families to be much more welcoming in their homes than non-jews.
    And your earlier comment, that jews only hire other jews, is beyond asinine, Shannon.
    You really do have a problem, here, Shannon; you really do.

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  3. Dear David, cheese is good, the stronger the better. Not for sissis of course ;-)... Did you know that we have one different cheese for every days of the year ?

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  4. I try to sort my "problem", Gene, everyday ;-). Let's see... You say you were "much more welcomed in jewish families than in non jews"... I thought you said you were much more welcomed in Arabic ones since your son in law is Iranian I believe... then what you say is implying you don't like your fellows non jews as much as the jews. What is your problem? Some people are always best at helping strangers, which is a good thing to do, but then they ignore or criticise their own family or neighbours. To me that is "beyond asinine".

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  5. Sleep on it, Swine Flu. Then forget it and leave it to the French to sort this ;-)

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  6. The pro-SUSY paper of today is in honour of a SUSY theorist who died. But sure, SUSY is just behind the next corner, we just need to be as optimist as communists under Brezhnev

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  7. Shannon, I am most respectful of national sovereignty. If burqa is not legal in France, I promise not to wear it during a visit there. But ideas have no national borders, so your invitation to leave even discussing the ideas to the French makes very little sense in an international blog like this one.

    By, the way, you wrote, "... as a woman ... I'd wear a
    niqab with no problem. In our secular republic of France we shouldn't be
    wearing ... niqab." So, which is it, niqab or no niqab?

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  8. Ok, swine flu :-), in France the law says you musn't wear "conspicuous religious signs" in school or at work, you can only wear "discreet/low-key signs". French Republic is very protective of its secularity called "Laïcité". It is difficult to put in place but nothing is impossible. As for the old churches they belong to the national heritage just like castles... Please don't mix everything.
    As for the niqab I would prefer to wear it if I had to live or walk across some highly Islamic places like in the north of Paris (le 9-3) for example. I will continue voting for the Front National who is the only party who truly wants to fight this islamist terror in France and Europe.

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  9. Why do you think that the probability of SUSY or SUSY at the LHC is affected by death of a SUSY theorist or by any event in the life of Brezhnev? Incidentally, to cite Brezhnev as a symbol of optimism is another source of doubts about your mental health.

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  10. Heh Shannon, remember this one?: http://www.dailymotion.com/video/x9hcb_les-inconnus-ushuaia-dans-son-froc_fun
    ;)

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  11. A strong ideology, stagnation, gerontocrats that celebrate imaginary successes, true belivers that see M(arx)-theory in 2sigma anomalies, dissidents cured by psychiatrists...

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  12. What is considered discreet for school and work? Can a Christian wear a small cross as a necklace? Can a Jewish male wear a kippa? Can a Muslim female wear a head scarf?

    As far as you wearing niqab in "highly Islamic" neighborhoods, do you not see that it is a kind of surrender to Islamism? I mean, if you felt that you had to wear it as a practical way to be safer given the current environment, fine, but do you consider it normal and appropriate that you would be less safe without it in those neighborhoods?

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  13. the record of the french during "occupation" is contemptuous. even DeGaulle recognized that the meme of the french resistance was a fiction, designed to keep the french from sitting on the losers' side of the table in negotiations after the war.
    Craven and spineless, the french destroyed every country they colonized...algeria, haiti...the list is endless.
    even canada isnt exempt from the contamination of the french, as quebec still suffers from its heritage.

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  14. Unfortunately France has those who treat religion as a weapon. I think people must feel free to wear what they want and express what they want. Others must respect that freedom.

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  15. WTF who upvotes such comments here?


    Roby 83, you have such a cute avatar picture, how can you post such ugly nonsensical trolling gibberish comments?


    You certainly know that every 5 sigma discovery has started out as a much less significant anomaly back in time, no?

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  16. The concept of symmetries and its application in physics is both deep and very successful.


    Thus it is surprising that SUSY is apparently disliked by many people, apparently only because there is no experimental verification of it yet.

    What is more natural than to assume that fermions and bosons are two aspects of the 'same thing'?

    What else would be a reasonable theory? Bosons and fermions just are, that's it? Like you are a caveman and you look at the blue sky and the conclusion is that sky is blue, life goes on, lets get some food?!

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  17. So you wear a niqab with no problem, but if you wear Jewish clothes, you have a problem.

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  18. This law is relatively new, and put in place specifically to target Muslims.

    Muslims are expanding, and Shannon's submission/dhimmitude will only expand to more and more areas of France.

    Hence the term no-go zones.

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  19. I have had the same experience, Gene. And Shannon doesn't seem to be able to comprehend that feeling welcomed by a particularly group does not mean that you have to dislike another group (or nationality).
    I worked summers for a wonderful Iranian physics professor as an undergrad, and my wonderful grad supervisor was jewish.

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  20. "Beyond asinine" is blindly hating people based on stereotyping and discredited scapegoating and myths.

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  21. A necklace with a cross is OK, a scarf around the head is ok as long as we can see the face. A kippa is considered as conspicuous.
    As for me wearing a niqab if I had to it would only be for protection only. Of course it is not normal to have to do this but our governments have let that situation happens. So noe we can only hope the Front National will win and then this will only be history. OK ? :)

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  22. MikeNov, read my answer to Swine Flu here under.

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  23. I do ! It is hilarious :-). It was very bold and courageous to do that. That is also my point that a woman in such a place as Barbès, is better off wearing muslim clothing (say a scarf and a long coat) rather than a jeans or short skirt...

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  24. Rehbock, a lot of muslim women are fined regularly for driving with the niqab to the point that some rich muslim has offered to pay their fines for them... And after a few years he has started complaining about the amount of fines and taxes he has to pay! Lol! He has made a formal complaint and all. Hilarious.

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  25. What are Jewish clothes ?? Because you don't seem to be aware that the most extreme of the jewish women wear exactly the same type of fully covered black niqab ? :-) Go and check for yourself on Google Images, type "jewish women in niqab".

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  26. Speaking seriously, I agree that SUSY is a beautiful mathematical structure. But this is not a good reason for covering its experimental status with propaganda.

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  27. You are one who stereotype catholics beyond asinine, Gordon.

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  28. I hope you enjoy your sharia inspired france...you deserve it.

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  29. I get to read the rambling musings of an ungrateful, spineless jew hater, who, nonetheless enjoys the fruits of her jewish citizens hard work and creative powers, as she vaccinates herself, uses modern medicine and computers, plugs into her electrical grid and makes excuses for her own country's cowardice and for islamic people's hate and violence.
    nice.

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  30. so there are places in paris that a jew shouldn't walk. youre nothing but a quisling.

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  31. Dear Dilaton, the upvotes are from Rastus Oringa and 6 guest votes. If I knew the IDs, I would ban their IP because they may be commenting under some "real" names.

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  32. Now it has 9 upvotes. Comparing this to how few upvotes comments in general get here, its a pretty strong indication that it *is* the same person doing it.


    Sometimes it also seems like people attack more sophisticated physics such as for example string theory because it is technically difficult and they are frustrated they can't "play along" so they would rather pretend that it isn't important or deep.

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  33. hey shannon... youre not alone in france. Some of your friends at work...doing the job that most dont have the despicable character necessary to attempt:

    http://news.yahoo.com/group-soccer-fans-prevent-black-man-boarding-train-102708243.html

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  34. Nice try, Shannon...diversion. I don't hate Catholics--just don't like delusional hierarchical religions of any type. I try to minimize my irrational thoughts, not pamper them, not give them rule in the brain's Pandemonium. Kids brought up as Catholics (or Jewish fundamentalists, or Muslims, or Christian fundamentalists) have suffered mind abuse, and have a rather stupid but powerful meme sitting in their BIOS .

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  35. This happens every hours in the US.

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  36. You are drivelling on like an old man David. Change record.
    There are many places where women, black people, jews, catholics shouldn't walk etc... you see Paris is no different than Los Angeles, Detroit, New York or any other towns in the world.

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  37. We can handle it David. We are grown ups. Leave it with us.

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  38. I am glad to hear that you don't hate catholics, Gordon. It makes me happy actually, because I thought you hated them. I think some atheists also have suffered mind abuse.

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  39. eh...not here in Philly, or in NYC, or virtually anywhere else...
    In the megalopolis that is the north eastern part of the US, with a population of over 50, 000,000, similar to that of france, hate crimes against black people are virtually unheard of, not tolerated, and never the type of gang attack we see here.
    you guys have some real problems in france, which isn't surprising, since you were formed in that very same crucible.

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  40. eh...get out of france, and walk around our cities...I guarantee you won't be accosted by angry islamic people here, and our minority populations manage to go around without police escorts.
    when have you spent time in the states?

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  41. Dear David, have you ever been to Europe ? Soccer fans are always violent and stupid and racists. This is their claim to fame. Same in the UK and Germany.
    We so have problems in France and we are doing our best to sort them, exactly the same as in the US.

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  42. Take a world map David and look at France and Europe. See in the South (down on the page) there is a huge country called Africa. It is a continent full of different countries. See the blue between the two continents ? This is the Mediterranean sea. A lot of illegal immigrants are crossing this small sea to reach the coasts of Italy and invade Europe. Why do they do that do you think ? Because there are wars in their countries. Because they have no other hopes. They risk their life and the lives of their children to come here. They are fleeing from Libya, Syria because of the wars the whole West has provoked over there.

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  43. The racists in the video you linked are English soccer fans. You may have missed that.

    "hate crimes against black people are virtually unheard of, not tolerated, and never the type of gang attack we see here."

    Lol. One thing is certain, a black guy arrested by the police in France has a far better chance of survival than in the US.

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  44. yeah...because the french police dont arrest any black guys (read algerian, somali or otherwise)
    My city, Philadelphia, has a black mayor, black city council president, black police chief, black fire commissioner, black school superintendant, and a police force that is representative of the city's population (majority black) most of the judges who sit on criminal cases are black.
    get out of your country once in a while shannon, you would be less provincial.

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  45. our country is made up of descendants of europeans and others who had the balls to leave that squalid contenent.
    serfs, inbred nobiltiy, and rent seekers are what your left with...once he jews leave, you will really be in trouble.
    good luck with you algerian brothers...FGM is on its way to you and yours.
    enjoy.

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  46. David, FYI you were answering the (pertinent) post from Scooby, not Shannon ;-).
    Do you always shoot from the hip ?

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  47. You know we say in France? "Americans are the only people who went directly from barbarity to decadence without going through what we name elsewhere Civilisation".
    G.Clemenceau

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  48. The guy who created the world wide web and made internet available to you, asshole, is called Tim Berners-Lee whom you must hate so much. Here is another list of the greatest inventors that will make you throw up : http://www.biographyonline.net/scientists/top-10-inventors.html

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  49. yeah...the guys who invented the microchip are/were jews...
    polio vaccine? jews.
    go suck an egg.
    you deserve the role of the dhimmi that you and your daughters will enjoy.

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  50. yesah...like your revolution brought about a republic..you can only wish...monarchies...dictatorships...defeat...failed colonial states...military defeat...ingratitude.
    go lecture the Haitians.
    putz.

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  51. It is sad, the separatism, of Muslim and Jew alike, has them vying for the same ecological niche, in an environment that only marginally appreciates them. Their ethnic driving abuts with Notre Dame, and abruptly stops. Social perfusion is only possible with Christian conversion.

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  52. So, a big scarf around the head is OK and a little kippa is not. If that is really the case, it would just be yet another example of women always having it better than men.

    http://themetrolive.com/wp-content/uploads/2014/09/Sophia-Loren.jpg

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  53. Yes because a scarf can also be a fashion accessory ;-).

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