Sunday, November 16, 2014

CMS: locally 2.6 or 2.9 sigma excess for another \(560\GeV\) Higgs boson \(A\)

And there are theoretical reasons why this could be the right mass

Yesterday, the CMS Collaboration at the LHC published the results of a new search:
Search for a pseudoscalar boson \(A\) decaying into a \(Z\) and an \(h\) boson in the \(\ell^+\ell^- \bar b b\) final state
They look at collisions with the \(\ell\ell bb\) final state and interpret it using the two higgs doublet model scenarios.

There are no stunning excesses in the data.

But I think it's always a good idea to point out what is the most significant excess they see in the data, and the CMS folks do just that in this paper, too.

On page 10, one may see Figure 4 and Figure 5 that show the main results.

According to Figure 4, a new Higgs boson with \(\Gamma=0\) has some cross section (multiplied by the branching ratio) that stays within the 2-sigma band but reveals a deficit "slightly exceeding 2 sigma" for \(m_A=240\GeV\) and slight 2-sigma excesses for \[

m_A = 260\GeV, \quad 315\GeV, \quad 560 \GeV.

\] And let's not forget about a different CMS search that suggested \(m_H=137\GeV\).

The excess for \(m_A=560\GeV\) has the local significance of 2.6 sigma which reduces to just 1.1 sigma "globally", after the look-elsewhere-effect correction.

As Figure 5 (which is similar but fuzzier) shows, this excess for \(m_A=560\GeV\) becomes even larger, 2.9 sigma (or 1.6 sigma globally) if we assume a larger decay width of this \(A\) boson, namely \(\Gamma=30\GeV\). The significance levels are mentioned in the paper, too.

That is somewhat intriguing. If there's another search for such bosons, don't forget to look for similar excesses at this mass. But it's nothing to lose your sleep over, of course.

Recall that the minimum supersymmetric standard model – a special, more motivated subclass of the two-higgs-doublet model – predicts five Higgs particles because \(8-3=5\) expresses the a priori real scalar degrees of freedom minus those eaten by the 3 broken symmetry generators.

These 5 bosons may be denoted \(h,H,A,H^\pm\). The first three bosons are neutral, the last two are charged. \(A\) is the only CP-odd CP-eigenstate.

If you want to get excited by a paper/talk that "predicted" this \(m_A=560\GeV\) while \(m_h=125\GeV\), open this June 2014 talk
The post-Higgs MSSM scenario
by Abdelahk Djouadi of CNRS Paris. On page 13, he deduces that a "best fit" in MSSM has\[

\tan\beta=1, \quad m_A = 560\GeV,\\
m_h = 125\GeV, \quad m_H = 580\GeV,\\
m_{H^\pm} = 563 \GeV

\] although the sentence right beneath that indicates that the author thinks that many other points are rather good fits, too. Good luck to that prediction, anyway. ;-)

The very same scenario with the same values of the masses is also defended in this May 2014 paper by Jérémie Quevillon who argues that these values of the new Higgses are almost inevitable consequences of supersymmetry given the superpartner masses' being above \(1\TeV\).

It sounds cool despite the fact that the simplest, truly MSSM-based scenarios corresponding to their "best fit" involve superpartners around \(100\TeV\). The discovery of the Higgses near \(560\GeV\) in 2015 would be circumstantial evidence in favor of supersymmetry, nevertheless.

Update: Abdelahk Djouadi told me that their scenario only predicts some 0.5 fb cross section (with the factors added) but one needs about 5 fb to explain the excess above. So it's bad news.


  1. How many of these 2-3 sigma results usually survive?

  2. SwineFlu, Pin up girls are ordinary because they are often presented in places or situations where any woman of any classes can be seen and they are dressed simply. Unlike the top fashion where models are very tall and skinny with less "generous" shapes.

  3. I have had periodically this kind of rants in my blog, the PC police are always alert, and ready to the (own) ridicule. In the end I think these squabbles are illustrative precisely of the very contradictions of feminism/hembrism. This guy posted a funny tweet in that regard:

  4. Haha, what a blasé truck driver... :)

  5. LOL, in elementary particle physics, the only result that once shown as a 2-sigma or 3-sigma hint of new physics in the last 20 years and survived - and we already know that it did - was the hint of the 125 GeV Higgs boson because that was the only "new discovery". So the percentage is very small but uncalculable.

    You may try to go deeper into the history but the percentage 50 years ago could have been different than now, so it's risky to extrapolate.

  6. Super přístup! +1

  7. Hi Motl,

    I am an avid reader of your informative and entertaining blog. However since the background of your blog has been changed to something liable to be misinterpreted in a very conservative university as mine, so I request you, it would be great if you could change it to something more abstract.

    Thanks & Cheers !!

  8. "Unlike the top fashion where models are very tall and skinny with less "generous" shapes."

    I suppose if one has a thing about stick insects, or young boys, then they're OK. But otherwise this appeal of skinny women has always been something of a puzzle to me. I much prefer them with a bit of meat on, in the style of Rita Hayworth, Jayne Mansfield or the younger Mae West to be sure.

    I can see a certain elegance to them though. But that's a hell of a price to pay for such ephemeral artistic tastes.

    There's something perverse about it too, akin to those revolting lip-discs that some native African women sport, which I guess that's their version elegance. Not nice.

    Mae West: "I believe that it’s better to be looked over than it is to be overlooked." God bless her. :)

  9. The inconvenient truth is that the shirt is tacky. One of the banes of modern life is people who want to engage in tasteless conduct without being willing to man up to the consequences. The more I think about it wearing such a shirt in public and on camera is incomprehensible.

  10. we need to send a probe to "drill" her... maybe she wont be as bitter.

  11. How is it different from wearing any other shirt - or skirt or suit or G-string or anything else - in public or on camera?

  12. Christ, these priests keep crawling out of the woodwork everywhere.

    What ARE the consequences? Dick. You tell us.

    While you're at it, do you have any other idiosyncratic tastes to which you'd dictate the rest of us must conform?

    "The inconvenient truth is that...." You utter fucking arsehole. That's no truth. It's just a mindless expression of a personal preference.

    People who exhibit your level of social control-freakery are the real bane — your type threatens everyone's comfort. Maybe some day you'll get nicely 'manned up' to the consequences yourself.

    Get off people's backs. Dick.

  13. :) Very good.

  14. No, I am too young to "remember" the 40's :), I discovered Rita Hayworth only about a year ago.

    This dance routine is timeless:

    (alternative link: - starting around 5 minutes).

    According to Wikipedia, "... Hayworth was featured in an August 1941 Life magazine photo in which she lounged seductively in a black lace negligee. When the United States joined World War II in December 1941, the photo
    made Hayworth one of the top two "pin-up girls" of the war years; the
    other was the blonde Betty Grable."

  15. This mix is quite nice, too

  16. Maybe the reason that you and other dimwits are so focused on Dr. Taylor's T-shirt (BTW there is nothing wrong with it) is that the science he was explaining was well above your and the other dimwits heads ...?

    Educated people acknoledge Dr. Taylor for the good science he has done, only barbarians and pea brains (they should not be confused with p-branes, LOL) attack him for what he wears.

  17. The biggest of all (un)peak at 240 GeV/c^2 - is that an even more probable unHiggs?

  18. But she had a non-modern attitude towards multiculturalism :) -

  19. No, seriously: her attitude to multiculturalism is exactly what I call modern!

    The programmatic promotion of multiculti whatever it costs could be called the "postmodern attitude" but not "modern".

  20. I also noticed said feminazies were fine with Kim K's huge butt, which you outshine with your opinion.

  21. My idea of tacky would be if he had explicit pics of genitalia on his shirt. Few colorful pics of stylized female figures in bikini or mini ... kids see much worse on the front pages of various magazines, when they pass by the counter in supermarket.

  22. Of course, in this case, his critics might benefit from examining one of his fingers...

  23. C'mon Lubos. There is a huuge difference. Cause the first thing I think of when I see Michelle's dress is SEX.

    Cause my mum told me about the SEX and it is the thing that bees do to the flowers, you know.

  24. Furthermore Richard, guy is a Brit, not an American. If he wanted to make a public statement that he likes sluts (which is what sluts who criticized him obviously assumed) he would have never excused himself in tears.

    For him it was probably something he thought proper for the celebration because of shiny colors.

  25. I actually agree - the First Lady is more "suggestive of sex" than the gunner girl. The gunner girl is suggestive of a female professional who is an attractive woman but who may focus on more professional activities, too.

  26. Shut up you moron

  27. Let me say that this comment only barely got through moderation, and the next one with the same userID wouldn't.

  28. I agree.

    Dishing out personal abuse is all very well but one should at least have the good manners put up the excuse of an argument to accompany it, even if it's a complete fake.

    Proper decorum is essential in polite company. :)

  29. Shannon,


    It's more amusing to me to be suddenly jolted to think of him as—incongruously and very much atypically—a complete naif, say a bear of a man but with the mentality and affability of a wide-eyed fun-loving seven year old boy, and the complete lack of sexual awareness to match, i.e. a Jethro Bodine* type. Or at least someone who is astonishingly thick.

    But blasé? Ah, you French, mon amie, you're too sophisticated, too knowing, too tired of life .... No, wait! Too post-coital tristessed, more likely! :)

    Which reminds me yet again: I need to get some in. I'm game for a rumble in the tunnel. :)

    Meanwhile, vive la différence!

    * I can't think of a more recent version. I avoid TV (and other MSM) these days as much as possible since almost everything about them winds me up, so thoroughly riddled are they with their hideous leftard agendas.

  30. No, he's right. Shut up you moron

  31. Cory BrandstetterNov 19, 2014, 6:27:00 PM

    Says the guy who supports the bullying of a man who did one of the greatest things on earth such as fanding a fucking space probe on a fucking comet. You and those stupid feminazi shrews bullied a good man to tears, all because he chose to where a shirt that his GIRLFRIEND made for him, AS A SIGN OF RESPECT TOWARDS HER.

  32. Luckily, no feminists read physics papers, otherwise all hell would break loose on phallic image from KPV paper (top post on evaporating landscape)

  33. Dear Tony, it may be OK even if they were reading papers because no true feminist has ever seen such a thing with her eyes, so she wouldn't know what the picture shows, anyway, and couldn't get irritated. ;-)

  34. I think, on one of the biggest days of his professional life, he probably had a bit more on his mind than, "What shirt should I pull out of the closet?" It's funny. My wife and I watched the whole thing and neither of us gave a second thought to his shirt. We were both fascinated and enthralled with the moment, and found Dr. Taylor's enthusiasm and obvious joy to be a real pleasure. Be honest. Who would you rather buy a beer? Dr. Taylor, or any one of the contorted-whiners who can't get past the guy's shirt because a "cutie girl" depiction threatens the foundations of a longed for utopia? Heck, I would buy every pitcher for the entire table, all evening long, just to have a conversation about the stunning accomplishment he and his team just pulled off. And I wouldn't care if he wore that shirt, with matching pants, shoes, and underwear. On the other hand, I wouldn't spring for a glass of water to sit down for one minute with some whining busybody who thinks, "All men are pigs and that shirt proves it." Life is too short to care what a bunch of miserable, "whoa-is-me, I am oppressed" cry-babies think. You don't like his shirt. Fine. Don't buy one like it. But try to get past the "All men are pigs" and try to appreciate what this man just accomplished for all mankind. They just put a washing machine on a comet. Think about that next time you try to parallel park a car.