Today at the EPS Conference on High Energy Physics in Venice, the LHCb experiment at CERN's Large Hadron Collider has reported the observation of Ξcc++ (Xicc++) a new particle containing two charm quarks and one up quark. The existence of this particle from the baryon family was expected by current theories, but physicists have been looking for such baryons with two heavy quarks for many years. The mass of the newly identified particle is about 3621 MeV, which is almost four times heavier than the most familiar baryon, the proton, a property that arises from its doubly charmed quark content. It is the first time that such a particle has been unambiguously detected.
Nearly all the matter that we see around us is made of baryons, which are common particles composed of three quarks, the best-known being protons and neutrons. But there are six types of existing quarks, and theoretically many different potential combinations could form other kinds of baryons. Baryons so far observed are all made of, at most, one heavy quark.
"Finding a doubly heavy-quark baryon is of great interest as it will provide a unique tool to further probe quantum chromodynamics, the theory that describes the strong interaction, one of the four fundamental forces," said Giovanni Passaleva, new Spokesperson of the LHCb collaboration. "Such particles will thus help us improve the predictive power of our theories."
"In contrast to other baryons, in which the three quarks perform an elaborate dance around each other, a doubly heavy baryon is expected to act like a planetary system, where the two heavy quarks play the role of heavy stars orbiting one around the other, with the lighter quark orbiting around this binary system," added Guy Wilkinson, former Spokesperson of the collaboration.
Measuring the properties of the Ξcc++ will help to establish how a system of two heavy quarks and a light quark behaves. Important insights can be obtained by precisely measuring production and decay mechanisms, and the lifetime of this new particle.
The observation of this new baryon proved to be challenging and has been made possible owing to the high production rate of heavy quarks at the LHC and to the unique capabilities of the LHCb experiment, which can identify the decay products with excellent efficiency. The Ξcc++ baryon was identified via its decay into a Λc+ baryon and three lighter mesons K-, π+ and π+.
The observation of the Ξcc++ in LHCb raises the expectations to detect other representatives of the family of doubly-heavy baryons. They will now be searched for at the LHC.
This result is based on 13 TeV data recorded during run 2 at the Large Hadron Collider, and confirmed using 8 TeV data from run 1. The collaboration has submitted a paper reporting these findings to the journal Physical Review Letters.
Explore further:
LHCb observes an exceptionally large group of particles
More information:
Paper: press.cern/sites/press.web.cer … paper_2017.07.06.pdf

bschott
1.3 / 5 (14) Jul 06, 2017antialias_physorg
4.8 / 5 (22) Jul 06, 2017Without people doing this in the past you wouldn't have...much of anything you use in everyday life. And yes, there were people like you at all times in history complaining about people playing around with 'useless electricity', 'useless automobiles', 'useless telephone' 'useless computers', 'useless lasers', .. (and I bet there were some Neanderthals that were complaining about uselsee clothing, too)
I would have guessed that at some point people would go "Wait a second. there seems to be a pattern, here. Maybe just because I don't know how to use this doesn't mean that someone much smarter than me won't know how to use this in the future to create something awesome"
But alas. Dunning-Kruger prevails.
Dingbone
1.9 / 5 (15) Jul 06, 2017PowerMax
4.6 / 5 (10) Jul 06, 2017exactly! I use antigravity every day to go to work and it still doesn t have a REAL recognition!!! this is a disgrace!
Dingbone
3.4 / 5 (5) Jul 06, 2017btb101
1 / 5 (1) Jul 06, 2017bschott
1.4 / 5 (9) Jul 06, 2017Actually, I would still have everything I use in everyday life because it is all composed of stable "particles". Ya see, people never did "this" in the past because science was based on experimentation with tangible replicable results and not claims based on math of what happened in the femto second prior to "decay" into stable particles and light.
Nice strawman, but no, I don't complain about people playing around unless all they are doing is playing around. You on the other hand seem to idolize those who "play around", never having to produce definitive, tangible results or actually prove any of the things they theorize.
Yes, pretty much every time you post.
Hyperfuzzy
1.7 / 5 (6) Jul 06, 2017shavera
5 / 5 (10) Jul 06, 20171) There's a human desire to have a story about how this world is, from the perspective of things that anyone (with the right tools, at least) can observe equally.
2) The people who do this research, especially grad students who do a lot of the heavy lifting, don't always stay in the field. They learn how to understand data and analyze it and other strong skills, and then go take those skills out to jobs that are selling products and improve the product being sold with the skills they learned finding this particle.
Also, yes just finding an excited state of a known particle, while interesting in our community, maybe doesn't need a layperson article trying to hype it.
Da Schneib
4.5 / 5 (8) Jul 06, 2017Dingbone
1 / 5 (2) Jul 06, 2017In his book about Laputa, Jonathan Swift criticized a world of mathematical and philosophical endeavour that does little or nothing to better people's lives, especially those of their subjects in the colony Balnibarbi, located beneath the floating Laputa. His satire could be applied to contemporary science with minimal changes, despite it's three hundred years old.
shavera
5 / 5 (7) Jul 06, 2017If you must view it in such terms, there is a degree of a 'market' about such things. Grad schools can only accept so many students for certain types of research, and that number is often dependent upon how much grant money they can argue for; which is, in turn, often dependent upon the 'value' of the research results.
But again, I also remind that just because a scientist is doing a 'pet project' now, doesn't mean that's the only thing they'll do in their entire lives. All the scientists at Los Alamos may have some 'pet project' but they're also doing research to keep our nuclear arsenal up to date and safe. Grad students go out into industry to make things, and so on.
Hyperfuzzy
1 / 5 (1) Jul 06, 2017antialias_physorg
5 / 5 (5) Jul 06, 2017But...but....but..Hollywood? they tell us you just have to slap the word 'scientist' on someone and suddenly they can du anything!
Hyperfuzzy
2.3 / 5 (3) Jul 06, 2017Charge does not have mass!
Your QM equivalency is not a causality! It's a circular argument; like, if God exist then ...
Charge exists! Definition of charge, the field occupies space from its center to infinity, therefore ... by the way, the field is the charge, this only changes with the motion of the charge, which is in response to the changing field, Maxwell, No Dr. E., No SM, ...
shavera
5 / 5 (5) Jul 06, 2017You can't just redefine a word and then expect everyone to mean your own unique meaning of the word. Charge does not, itself, have mass, you are right. It is simply a value that describes how strongly a particular particle couples to the electromagnetic field. But all your other redefinitions of it have no meaning in terms of physics or otherwise.
I do encourage you to actually learn what these terms mean within the field (of physics), how they work within the field, before going about trying to tell us you've overthrown the field you don't presently know.
Hyperfuzzy
1 / 5 (2) Jul 06, 2017There's your error, you don't know what charge is? No, no overthrow, I'm just throwing away your nonsense. Nothing new here. Forget the 20th century except for Maxwell, juz say'n by the way, wiki... is incomplete, where does the field originate?
Da Schneib
4.8 / 5 (4) Jul 06, 2017And BTW Maxwell is 19th century physics. On Earth.
And there's no theory involved in that; it's the outcome of experiment. There is nowhere to hide.
Mimath224
5 / 5 (1) Jul 06, 2017Dingbone
1 / 5 (1) Jul 07, 2017nikola_milovic_378
1 / 5 (1) Jul 07, 2017It seems, and it is certain that they do not know why this is happening, and the reason is that they do not know the processes of forming matter, nor do they know that matter is formed from the ether that "tumbled" into the quarks and gluons themselve
nikola_milovic_378
1 / 5 (1) Jul 07, 2017Dingbone
1 / 5 (1) Jul 07, 2017If the string theorists would be just a bit clever (and if they would understand what they're trying to calculate), they would already recognize the formation of these nested structures as an example of extradimensions, which they're (unsuccessfully) searched at the LHC - despite that they have them before their noses all the time.
Dingbone
1 / 5 (1) Jul 07, 2017The formation of daughter vortices can be also observed often inside the surfer waves from underwater. These waves are forced to slow-down at the coast and their excessive energy gets consumed into a formation of parasitic vortices, which can be often quite dangerous for surfers (they're invisible from surface and they're able to break their board into halves). In language of high energy physics the surfer waves undergo hadronization and they change into a massive particles, once they arrive into more dense environment (i.e. the coast).
nikola_milovic_378
1 / 5 (1) Jul 07, 2017I always say and ask questions to you all:
Do you have any evidence of why and why this "fat" quark rises, only in the experiment, and whether there is any chemical element in nature that has such "bred quarks" in its baryons. If it does not exist in nature, it means that It is my assertion that in the collisions, the properties of particles can be changed, since the basis of all kinds of matter is formed from ether, which "controls" the behavior of what is formed, and regulates the quasi formation. When the proton accelerates,
nikola_milovic_378
1 / 5 (1) Jul 07, 2017Who causes increased spin and why spin occurs in each particle. When this happens, everything will be clear about the behavior of the particles. You can not compare the movement of the wave of matter (liquids and gases), with the waves of the energy state of matter, such as electromagnetic waves.
And what are the electro-magnetic waves, how do they come out, from what and who forms them? Again, science has no evidence, and it will interfere with the "details".
Therefore, to date there are no results, and although there are, they are disagreeable in conflict with natural laws and behavior of matter.
shavera
3.7 / 5 (3) Jul 07, 2017These particles have 2 charm quarks and an up quark. A Charm quark has a mass of 1290 MeV/c². So even just in terms of their isolated rest masses, we're already looking at 2600 MeV/c² in mass. And if it was around 900 MeV/c² in binding energy to hold a proton together, when we add that to the 2600 above, we get 3500 MeV/c² in binding energy, which... I'd say is a pretty fair match for the measured 3621 given in the article.
Frankly you'd have to be quite the UNreasonable person not to see the result as fairly plausible. I mean it's simple addition. No crazy calculus or anything.
shavera
3.7 / 5 (3) Jul 07, 2017Yes, so if we talk about these 'sea quarks' within the proton, some of those quark-antiquark pairs will be strange/anti, charm/anti, bottom/anti, top/anti. They're not "on shell" quarks (meaning that while they exist in *some way* they don't have the full energy to truly exist), but if something collides with one of these "off shell" quark pairs, and gives them enough energy to truly exist, and kick them out of the proton (or other particle), then you can observe their exit.
Why aren't they produced in nature? They probably are around, like, black holes, but no non-human processes on Earth possess enough energy to create them.
shavera
3.7 / 5 (3) Jul 07, 2017Already an answered question. Doing the relevant quantum mechanics and including relativity will show how spin arises.
Already an answered question. There is an electromagnetic field throughout all of space. A field is not a thing or a substance or a fluid. It is simply that at every point in space, you can, in principle measure some numbers that describe the behaviour of a charged particle at that point. The way that this electromagnetic field generates non-zero values is that there are particles with an associated 'electric' charge that may be in motion; and, again including relativity of that motion, mean that the field around them has electric and magnetic components. Those components, in turn may form 'waves' as they vary over space and time.
shavera
3.7 / 5 (3) Jul 07, 2017nikola_milovic_378
1 / 5 (2) Jul 07, 2017My understanding:
All matter is formed from ether and a "solid state of matter" (quarks, electrons and positrons) arises, and "liquid state of matter" is the energy state (gluons) obtained by annihilation of electrons and positrons.
These two states have a residual "family relationship" with the ether from which they are formed, so the consequences of these relations occur: gravity ("solid state of matter" and ether), and magnetism ("liquid state of matter" and ether).
The basic natural particle of matter is 3 quarks and 3 gluons.
nikola_milovic_378
1 / 5 (2) Jul 07, 2017So science leads us astray from the one that explains the true causes of the phenomenon in the universe.
This is my know how. And copyright in the future.
Hyperfuzzy
1 / 5 (1) Jul 07, 2017You only measure changes in the fields. When moving particles around, the created becomes a creator! You have no idea whether you are measuring something, or creating and unknown combination of charges. The danger is allowing a child, without knowledge, muddle with atomic devices.
The universe trying to define itself! Maybe, those signals from space, i.e. unknown sequence, knows better than you. Wonder if they are as aggressive as you. i.e. trying to define yourself as intelligent! No, I doubt that our mentality could reach their level! We're too persnickety and stupid!
Hyperfuzzy
not rated yet Jul 07, 2017Hyperfuzzy
not rated yet Jul 07, 2017Thus we define truth, else prove me wrong! A field does not affect another field. A charge within a field creates a field wrinkle, i.e. each charge or the fields are interacting, we measure the motion of the centers, correct? We only measure the wrinkles?
Hyperfuzzy
not rated yet Jul 07, 2017Hyperfuzzy
not rated yet Jul 07, 2017nikola_milovic_378
not rated yet Jul 07, 2017I do not intend to convince anyone to accept what I propose. But it is very symptomatic in the whole science that it is always claimed that something has been proven, and later it is established that there is nothing of it.
But, think about what is gravity and magnetism, and you will be orientated on the right path. And dark matter is ether. Dark energy is what can not be measured by what science has, but it is real energy.
Hyperfuzzy
not rated yet Jul 07, 2017The universe trying to explain itself, "nothing" is only conceptual!
nikola_milovic_378
not rated yet Jul 08, 2017The universe trying to explain itself, "nothing" is only conceptual!
The universe does not try to explain itself. Universe is organized so that processes of creation and disappearance of matter (beginning of formation and end-black hole) take place in it, according to natural laws. And we, human beings, are two-entity as well as the universe (spiritual and material-energy entity). But the great misconception of most scientists is that they do not know themselves or the universe, and that's why we do not know about the true causes of origin and behavior.
georgesardin
not rated yet Jul 08, 2017https://www.resea...ibutions
IronhorseA
5 / 5 (1) Jul 08, 2017You confuse science with engineering.
Hyperfuzzy
not rated yet 23 hours agoDa Schneib
5 / 5 (2) 23 hours agoEither you are confounding philosophy with physics, or you are obscuring physics with philosophy. Either way, to anyone who knows physics, you are dead wrong. Get over it.
Mimath224
not rated yet 18 hours agoDa Schneib
5 / 5 (2) 17 hours agoDingbone
not rated yet 8 hours agonikola_milovic_378
1 / 5 (1) 7 hours agoGluon (free) is formed by annihilation of an electron-positron pair. When a gluon occurs in a 3 kg particle, a neutron occurs, but a neutron can be formed when the proton is in the 3 kg particle and into the proton when an electron enters. Gluon is not virtual congenital, but it is the "liquid state" of matter, which represents the way of forming energy from matter. When this science understands, it will stop playing children's games with particle collisions, because it can be understood and explained from this one.
georgesardin
not rated yet 4 hours agoDingbone
not rated yet 2 hours ago