A001's Posts
Nairaland Forum › A001's Profile › A001's Posts
1 2 3 4 5 6 7 8 ... 148 149 150 151 152 153 154 155 156 (of 184 pages)
Introduction to Parton Distribution Functions http://www.scholarpedia.org/article/Introduction_to_Parton_Distribution_Functions |
New insight into the internal structure of the proton While the Large Hadron Collider (LHC) at CERN is well known for smashing protons together, it is actually the quarks and gluons inside the protons—collectively known as partons—that are really interacting. Thus, in order to predict the rate of a process occurring in the LHC—such as the production of a Higgs boson or a yet-unknown particle—physicists have to understand how partons behave within the proton. This behavior is described in parton distribution functions (PDFs), which describe what fraction of a proton's momentum is taken by its constituent quarks and gluons. Knowledge of these PDFs has traditionally come from lepton–proton colliders, such as HERA at DESY. These machines use point-like particles, such as electrons, to directly probe the partons within the proton. Their research revealed that, in addition to the well-known up and down valence quarks that are inside a proton, there is also a sea of quark–antiquark pairs in the proton. This sea is theoretically made of all types of quarks, bound together by gluons. Now, studies of the LHC's proton–proton collisions are providing a detailed look into PDFs, in particular the proton's gluon and quark-type composition. The physicists at CERN's ATLAS Experiment have just released a new paper combining LHC and HERA data to determine PDFs. The result uses ATLAS data from several different Standard Model processes, including the production of W and Z bosons, pairs of top quarks and hadronic jets (collimated sprays of particles). It was traditionally thought that the strange-quark PDF would be suppressed by a factor of ~2 compared to that of the lighter up- and down-type quarks, because of its larger mass. The new paper confirms a previous ATLAS result, which found that the strange quark is not substantially suppressed at small proton momentum fractions and extends this result to show how suppression kicks in at higher momentum fractions (x > 0.05) as shown in Figure 1. Several experiments and theoretical groups around the world are working to understand PDFs. While their results are generally in agreement, there has been some variance at the high-momentum fraction (x > 0.1) that could impact high-energy searches for physics beyond the Standard Model. Further, it has become increasingly clear that a better understanding of PDFs at mid-range momentum fractions (x ~ 0.01–0.1) is needed if physicists are to find evidence for new-physics processes in the deviations from the Standard Model of quantities such as the mass of the W boson or the weak mixing angle. This would require knowledge of PDFs to an accuracy of ~1%. This is where the ATLAS analysis contributes most powerfully, as the accuracy of the PDFs depends on detailed knowledge of the systematic uncertainties of the input data. The ATLAS Collaboration is able to assess the correlations of such uncertainties between their datasets and account for them—an ability put to great effect in their new PDF result. Such knowledge was not previously available outside ATLAS, making this result a new "vademecum" for global PDF groups. It turns out that the impact of such correlations can shift the central values of the PDFs by > 1% in the mid-range momentum region, and by much more than this in the high-x region, as shown in Figure 2. ATLAS' new understanding of PDFs will be used in the search for new physics processes when the LHC restarts later this year. Further, the techniques described in the paper will aid future analysis groups—both at ATLAS and beyond—in determining more accurate parton distribution functions. Source: https://phys.org/news/2022-01-insight-internal-proton.amp |
![]()
|
Amoto94:In your Bible abi? I see you're now mixing up the stories about Isa in the Qur'an with those of Jesus in the Bible. Amoto94:Okay, Abraham almost sacrificed his son, not that he sacrificed. Whether he almost sacrificed his son or he actually sacrificed him like Yahweh did to Jesus, the barbaric act of ritual human sacrifice is also a key aspect of Christianity. It's one of the many things the founders of the religion copied from African native religions. The adherents of native religions in Nigeria, who don't engage in offering ritual human sacrifices, need to do more to condemn the heinous act. Also, when there are more Nigerians dumping religion for freethinking and use of the scientific method (observation, reasoning, and experimention) in solving life's problems, cases of ritual killings will reduce in the country.
|
nihilistjnr:You don't have to single out the Yoruba culture. In various parts of the world where people believe in one god or the other and have various superstitious beliefs, ritual human sacrifices are/were common. Even Christianity, the world's most popular religion, has this same barbaric act of ritual human sacrifices at its core: Yahweh sacrificed (killed) his only begotten son, Jesus, to save the world he supposedly created. Whichever way Christians edit and continue to edit the Bible, smart people can observe this same barbaric act of ritual human sacrifice at the heart of Christianity. Or should I give you other references of the barbaric act from the Bible, such as how Abraham sacrificed his son for Yahweh, etc. Whether it's done by the whites in the name of God (Jehovah), or by the Jihadists to please Allah following the footsteps of the founder of their religion, or by the traditionalists, ritual human sacrifices are evil and barbaric. |
Havertz10:I'm not surprised you'd say this. When a poster consistently displays lack of critical thinking in key aspects of life, they'd say this. I'd advise you to follow your own suggestion and start killing all the babalawos in your community. It's easy to type nonsensical posts here, thinking by showing your disdain for the local cultures, that makes you intelligent. But it only exposes your deeply ingrained inferiority complex and self-hate. |
TheHulk616:Is Hazard also responsible for this tripe you typed ![]() |
Astrid4:There are good babalawos and bad ones as well, and the same thing applies to the clerics of the other two popular religions. |
Havertz10:So, they should kill all the babalawos because of some bad eggs among them? And that looks reasonable and achievable to you? |
Phillipson02:Interesting, the first picture doesn't show the real creature though. It's a reconstructed, computer-generated image of the discovered fossils. |
Phillipson02:Interesting, the first picture doesn't show the real creature though. It's a reconstructed image of the discovered fossils. |
Workch:I think it's more correct to say that according to the popularly known history of science, Copernicus and Galileo discovered that the Earth is a sphere. I think the ancient Egyptians had known the shape of the Earth hundreds (if not thousands) of years before even Copernicus or Galileo was born. And a number of ancient Greek philosophers, who schooled in ancient Egypt, also knew. But almost all the books of ancient Egyptians were destroyed with the Alexandra Library. I think if you're widely read, you'd know many things that are touted as historical facts in the mainstream science (especially concerning science and technology in ancient Egypt and Africa) aren't really true. Most are pure lies or half-truths. The shape of the Earth looks like something elementary for a civilization that could construct those pyramids, obelisks, and preserve their dead for thousands of years. Don't you think so? |
NASA to Host Coverage, Briefing for Webb Telescope’s Final Unfolding https://www.nasa.gov/press-release/nasa-to-host-coverage-briefing-for-webb-telescope-s-final-unfolding/ |
hopefulLandlord:Okay, I understand. About the bolded, I think your response is what will first crop up in the mind of most skeptics or freethinkers. But if what he described has happened to you not once, twice, or thrice, you'd know it's mysterious seeing some events in the dream that play out accurately or almost accurately later on in real life, without you interfering. It's possible there are many properties or abilities of the brain that neurologists and brain surgeons are yet to discover. |
hopefulLandlord:This response is simplistic. Life is a lot deeper than most atheists paint it. I'm sure the guy that asked those questions is aware of most of the things you said here even before he asked the questions. When you've studied your dreams over the years, you'd know when some of them come to pass with uncanny accuracy and the feeling can even come as a surprise when you saw an event in the dream, and it comes to pass with over 90% or even 100% accuracy in the details (not just generic statements like "someone died in the dream" ). If a person really has the gift of their dreams coming to pass, they'd see the exact or almost exact details of how the event (death of a person) will happen. The details are the main thing, not the generic statements. And if someone has such an experience, whereby they've seen a dream that seems like a vision of a (near) future event come to pass many times, they'd know they've the gift of seeing visions (dreams that come to pass). It would actually be so naive of you to think life is as simple as the typical atheist paints it. It's a lot deeper, and the scientific understanding of the power of our minds isn't that advanced. And it's not simply due to intuition as well. I know without any iota of doubt there are people with such a gift of seeing future events as a vision in their dream. But I don't know why that happens scientifically and am willing to learn from others who may know more than I do as far as the subject matter is concerned. I know there will be a scientific principle behind the phenomena (of seeing visions in dreams). |
Jorginho makes the team gel and transition from defence to attack. But he's overhyped and a weak link in the midfield. He's just a good player that's extremely lucky. It's not as if he's even better than Mikel. |
This is the same principle (quantum entanglement) that magicians apply to make their audience see what is in their (magicians') mind since all heads are connected (or entangled).
|
musicwriter:Bros, any update about the other matter I discussed with you please? |
![]()
|
Astrid4:Good call. Havertz should chop bench. Useless player |
Havertz10:Chelsea should sell Lukaku so that the weakling called Havertz can further weaken our attack abi. Yeye If we're to sell any player, it's Havertz that should be the top choice. He's nothing but a fraud and is so annoying to watch. He's both weak mentally and physically. In fact, frail is the right word to use, not weak. |
Rosement:A. The Universe has always existed because existence has no beginning and end. All things in the universe, including we humans, have always existed in one form or another and even after death, they'll continue to exist in other forms. |
afrodoc2:Where are you now, bros? Are not still in the world ![]() |
EmperorHarry:1. Contrary to how falling objects are visualized as traveling in a line theoretically, objects don't fall down in a straight line in reality because their motion is disrupted by air resistance or drag force unless during a free fall (devoid of air resistance), which is also a theoretical scenario at least on Earth. 2. From the Newtonian (classical) worldview, planets are kept in orbits round the Sun due to the Sun's immense gravitational pull on these planets. But gravity, as defined relativistically by Einstein, isn't a force but a distortion of space and time by mass and energy. The sun's gravity is still what keeps the planets in orbit here as it warps (or distorts) the spacetime around the Sun by an immense amount since the Sun is the largest object in the solar system. The planets take the shortest path (or geodesic) through the spacetime around the Sun, and this explains their orbits. The distortion of spacetime by the Sun, in other words gravity, is what creates the "well". |
EmperorHarry:Yes, but I'm always willing to learn more. What are those applications and effects? |
![]()
|
![]()
|
Saturn444:.. Your thought experiment, referred to as gedanken in science, is interesting, and who knows, we might actually be living in the thought or as thoughts of a higher (universal) Mind, as the hermetists say. |
HardMirror:I'm not an Otem expert. It seems reading isn't your forte. If it's, you'd have seen my area of specialization in my signature. |
HardMirror:Maybe you read a few pages of the thread (with many posts hidden by mods and concluded hastily). I don't see the signs you have the literature and have read this book you're reviewing in detail. You'd have to be a very dishonest person to read Otem's book in detail and study the Seriot language and then claim he stitched those histories together and also stitched the language together. If na so e dey easy to stitch tales together, the world would be full of geniuses in writing and many conlangs. Hope you're aware all of the languages spoken all around the world today came naturally with some early humans (deified as gods and goddesses) as one of their innate abilities. Well, if you know the history of humans well enough, you'd know it's a big deal to come up with a language that looks like a natural language. Enough said about the book. I wouldn't want to derail this thread further about posts on the book. This isn't a history thread. |
HardMirror:Your comments show you don't have the book and haven't read it. No reasonable person reviews a book they've not read. |
1 2 3 4 5 6 7 8 ... 148 149 150 151 152 153 154 155 156 (of 184 pages)


