Immagine
 Trilingual World Observatory: italiano, english, română. GLOBAL NEWS & more... di Redazione
   
 
\\ Home Page : Articolo
BaBar researchers announce first evidence of predicted particle subtype.
By Admin (from 21/05/2011 @ 08:00:01, in en - Global Observatory, read 2242 times)

Data collected by the BaBar experiment during its final months of operation in 2008 point to a new member of the "bottomonium" family of subatomic particles. BaBar collaboration member and SLAC physicist Valentina Santoro presented the results on behalf of the collaboration last month at the Lake Louise Winter Institute, a yearly conference held at Lake Louise, Alberta, Canada. The discovery adds another piece to physicists' model of the so-called "strong" force, which binds subatomic particles into larger chunks of matter.

In 2008, members of the BaBar collaboration announced they'd discovered the lowest-energy bottomonium particle, called ?b (pronounced eta-sub-b). A subsequent BaBar study confirmed the finding in 2009. Continued examination of the final BaBar data set has now revealed another particle of the bottomonium family, called the hb (h-sub-b).

Several variants of bottomonium—a bottom quark bound to a bottom anti-quark—have been predicted and a number have now been observed, the first more than thirty years ago. But many of the predicted states remain unobserved. Each one discovered offers a valuable window into quantum chromodynamics, or QCD, explained BaBar Physics Analysis Coordinator Steve Robertson. QCD is the theory of the strong force that binds quarks into the protons and neutrons that make up atomic nuclei (and ultimately us). It's an important part of the Standard Model, currently the best theory physicists have to explain matter, energy, and how the two interact.

"Since [bottomonium particles] are held together by the strong force interactions, studying the particles is a good way to study the strong force," Robertson explained. However, studying them isn't easy. The strong force, though effectively limited in distance to lengths that span an atomic nucleus, is strong. Individual quarks have never been isolated, and all bottomonium particles are unstable and decay rapidly into lighter, less exotic particles. That means particle physicists must study them indirectly, by taking the final products of a particle collision, after any bottomonia have decayed away, and tracing back along the processes required to create these decay products. In this way, they can determine the nature of the particle at the beginning of that chain of particle decays. It's somewhat akin to running a film backward to watch shards of porcelain on the kitchen floor rise into the air and reassemble themselves into a tea cup on a table.

The BaBar researchers combed through data from more than 120 million electron–positron collisions to find their shards. They also narrowed the possibilities for how the hb particle is created, and confirmed theoretical predictions of its mass.

Less than two weeks after Santoro presented the results, a group of researchers from Belle, a collaboration based at the KEK facility in Japan, announced their observation of the hb particle while studying a completely different and somewhat unexpected decay process. Figuratively speaking, the Belle researchers watched the same pile of porcelain shards reassemble into a coffee mug.

Source: PhysOrg

Provided by SLAC National Accelerator Laboratory

Articolo Articolo  Storico Storico Stampa Stampa  Share
Cannabis seeds, Autoflowering seeds, Greenhouse, Sweet Seeds, Dutch Passion
comments powered by Disqus
 
Nessun commento trovato. No comments found. Nici un comentariu găsit.

Anti-Spam: dial the numbers CAPTCHA
Text (max 5000 characters)
Nome - Name - Nume
Link ( OPTIONAL - visible on the site - NOT a must )


Disclaimer
Tuo commento sarŕ visibile dopo la moderazione. - Your comment will be visible after the moderation. - Comentariul tău va fi vizibil după moderare.
Ci sono 3634 persone collegate

< luglio 2019 >
L
M
M
G
V
S
D
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
       
             

Titolo
en - Global Observatory (605)
en - Science and Society (594)
en - Video Alert (346)
it - Osservatorio Globale (503)
it - Scienze e Societa (555)
it - Video Alerta (132)
ro - Observator Global (399)
ro - Stiinta si Societate (467)
ro - TV Network (149)
z - Games Giochi Jocuri (68)

Catalogati per mese - Filed by month - Arhivate pe luni:

Gli interventi piů cliccati

Ultimi commenti - Last comments - Ultimele comentarii:
Hi, it's Nathan!Pretty much everyone is using voice search with their Siri/Google/Alexa to ask for services and products now, and next year, it'll be EVERYONE of your customers. Imagine what you are ...
15/01/2019 @ 17:58:25
By Nathan
Now Colorado is one love, I'm already packing suitcases;)
14/01/2018 @ 16:07:36
By Napasechnik
Nice read, I just passed this onto a friend who was doing some research on that. And he just bought me lunch since I found it for him smile So let me rephrase that Thank you for lunch! Whenever you ha...
21/11/2016 @ 09:41:39
By Anonimo


Titolo

Latest NEWS @
www.TurismoAssociati.it

Non-Hodgkin lymphoma cured by CANNABIS. The video of Stan and Barb Rutner.

Dr. Joycelyn Elders, U.S. surgeon general: Myths About Medical Marijuana in The Providence Journal, 2004.

Marihuana vindeca CANCERUL: marturii despre uleiul de cocos si canabis.

Yahoo Incorporated Mail. My account recovery information is incorrect. The Password Helper says my password can't be reset online. "First time signing in here?" message.

All information in a video about Donatio Mortis Causa and The Venus Project

What is TOR browser?

Icahn launches proxy fight after stalled talks with Occidental CEO

Asia stocks firm as Fed props up rate cut expectations

Microsoft shares hit record highs, powered by growing cloud sales

Japan summons South Korea envoy in escalating row over wartime forced labor

Japan says no comment on International Court of Justice plan in South Korea dispute

U.S.-China officials discuss trade; Mnuchin eyes possible in-person talks

Ultimele articole - Antena3.roHOROSCOP 19 iulie 2019. Berbecii se apuca de renovari în casa, Gemenii au o idee sa faca bani

VREMEA 19 IULIE. Temperaturile încep sa creasca u?or, dar nu scapam de ploi

HOROSCOP 19 iulie 2019. Berbecii au probleme în cuplu, Gemenii gasesc solu?ii la toate problemele

CALENDAR ORTODOX 19 IULIE. Ce sfânta mare sarbatoresc cre?tinii orotodoc?i astazi

”Am 49 de ani ?i so?ia mea refuza sa mai faca amor cu mine. Am încercat de mii de ori sa o conving, dar în zadar. În cele din urma, am gasit solu?ia la problema mea"

Viata dubla pe internet a lui Gheorghe, preotului-pedofil. Cerea bani pe Facebook, dar pe Instagram facea altceva: „Vreau sa nu mai patrunda Diavolul, sa nu mai am ispite“





19/07/2019 @ 06:03:24
script eseguito in 790 ms