Observation of the Omega(b)- Baryon and Measurement of the Properties of the Xi(b)- and Omega(b)- Baryons PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Observation of the Omega(b)- Baryon and Measurement of the Properties of the Xi(b)- and Omega(b)- Baryons PDF full book. Access full book title Observation of the Omega(b)- Baryon and Measurement of the Properties of the Xi(b)- and Omega(b)- Baryons by . Download full books in PDF and EPUB format.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Get Book Here
Book Description
The authors report the observation of the bottom, doubly-strange baryon?{sub b}− through the decay chain?{sub b}− → J/??−, where J/? →??−,?− →?K−, and? → p?−, using 4.2 fb−1 of data from p{bar p} collisions at √s = 1.96 TeV, and recorded with the Collider Detector at Fermilab. A signal is observed whose probability of arising from a background fluctuation is 4.0 x 10−8, or 5.5 Gaussian standard deviations. The?{sub b}− mass is measured to be 6054.4 ± 6.8(stat.) ± 0.9(syst.) MeV/c2. The lifetime of the?{sub b}− baryon is measured to be 1.13{sub -0.40}{sup +0.53}(stat.) ± 0.02(syst.) ps. In addition, for the?{sub b}− baryon they measure a mass of 5790.9 ± 2.6(stat.) ± 0.8(syst.) MeV/c2 and a lifetime of 1.56{sub -0.25}{sup +0.27}(stat.) ± 0.02(syst.) ps.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Get Book Here
Book Description
The authors report the observation of the bottom, doubly-strange baryon?{sub b}− through the decay chain?{sub b}− → J/??−, where J/? →??−,?− →?K−, and? → p?−, using 4.2 fb−1 of data from p{bar p} collisions at √s = 1.96 TeV, and recorded with the Collider Detector at Fermilab. A signal is observed whose probability of arising from a background fluctuation is 4.0 x 10−8, or 5.5 Gaussian standard deviations. The?{sub b}− mass is measured to be 6054.4 ± 6.8(stat.) ± 0.9(syst.) MeV/c2. The lifetime of the?{sub b}− baryon is measured to be 1.13{sub -0.40}{sup +0.53}(stat.) ± 0.02(syst.) ps. In addition, for the?{sub b}− baryon they measure a mass of 5790.9 ± 2.6(stat.) ± 0.8(syst.) MeV/c2 and a lifetime of 1.56{sub -0.25}{sup +0.27}(stat.) ± 0.02(syst.) ps.
![Observation of Charmed Strange [omega]0/c Baryon in E+e- Collisions and First Observation of Charmed Strange Baryons [xi]+'/c (c{s, U}) and [xi]0'/c (c{s, D}) PDF](https://books.google.com/books/content/images/frontcover/24DxxgEACAAJ?fife=w80-h100)
Author: Syed Basit Athar
Publisher:
ISBN:
Category : Baryons
Languages : en
Pages : 191
Get Book Here
Book Description
Author: B. Aubert
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Get Book Here
Book Description
The authors report the first observation of an excited singly-charmed baryon {Omega}*{sub c} (css) in the radiative decay {Omega}{sub c}{sup 0}{gamma}, where the {Omega}{sub c}{sup 0} baryon is reconstructed in the decays to the final states {Omega}{sup -}{pi}{sup +}, {Omega}{sup -} {pi}{sup +}{pi}{sup 0}, {Omega}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +}, and {Xi}{sup -} K{sup -} {pi}{sup +}{pi}{sup +}. This analysis is performed using a dataset of 230.7 fb{sup -1} collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at the Stanford Linear Accelerator Center. The mass difference between the {Omega}*{sub c} and the {Omega}{sub c}{sup 0} baryons is measured to be 70.8 {+-} 1.0(stat) {+-} 1.1(syst) MeV/c{sup 2}. They also measure the ratio of inclusive production cross sections of {Omega}*{sub c} and {Omega}{sub c}{sup 0} in e{sup +}e{sup -} annihilation.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 119
Get Book Here
Book Description
This thesis reports the first experimental evidence of the doubly strange b-baryon?{sub b}− (ssb) following the decay channel?{sub b}− → J/?(1S)??−?−? K− p?− in p{bar p} collisions at √s = 1.96 Tev. Using approximately 1.3 fb−1 of data collected with the D0 detector at the Fermilab Tevatron Collider, they observe 17.8 ± 4.9(stat) ± 0.8(syst)?{sub b}− signal events at 6.165 ± 0.010(stat) ± 0.013(syst) GeV/c2 with a corresponding significance of 5.4?, meaning that the probability of the signal coming from a fluctuation in the background is 6.7 x 10−8. The theoretical model we have to describe what we believe are the building blocks of nature and the interactions between them, is known as Standard Model. The Standard Model is the combination of Electroweak Theory and Quantum Chromodynamics into a single core in the attempt to include all interactions of subatomic particles except those due to gravity in a simple framework. This model has proved highly accurate in predicting certain interactions, but it does not explain all aspects of subatomic particles. For example, it cannot say how many particles there should be or what their masses are. The search goes on for a more complete theory, and in particular an unified field theory describing the strong, weak, and electromagnetic forces. Twelve elementary particles are known in the Standard Model: the Fermions. They have spin -1/2 and obey the Pauli Exclusion Principle. Fermions are divided into six Quarks: up u, down d, charm c, strange s, top t and, bottom b; and six Leptons: electron e, muon?, tau?, electron neutrino?{sub e}, muon neutrino?{sub {mu}} and, tau neutrino?{sub {tau}}. Quarks interact via the strong force because they carry color charge, electromagnetically because of their electric charge and via the weak nuclear interaction because of the weak isospin. Quarks form color-neutral composite particles known as Hadrons which are divided in Mesons, containing a quark and an antiquark and Baryons, made up three quarks. Leptons have no color charge and can not interact via the strong force. Only three of them have electric charge, hence interact electromagnetically. The motion of non-electrically charged leptons, the neutrinos, is influenced only by the weak nuclear interaction. Every fermion have an associated antiparticle. For quarks, the antiparticle carry opposite electric charge, color charge and baryon number. For leptons, the antiparticle carry opposite electric charge and lepton number. Fermions are suitably grouped together considering their properties and three generations of them are defined. A higher generation fermion have greater mass than those in lower generations. Charged members of the first generation do not decay and form the ultimate building blocks for all the baryonic matter we know about. Charged members of higher generations have very short half lives and are found normally in high-energy environments. Non-electrically charged fermions do not decay and rarely interact with baryonic matter. The way particles interact and influence each other in the Standard Model is result from matter particles exchanging other particles, known as Force Mediating Particles. They are believed to be the reason of the existence of the forces and interactions between particles observed in the laboratory and the universe. Force mediating particles have spin 1, i.e., they are Bosons, and do not follow the Pauli Exclusion Principle. The types of force mediating particles are: the photon?, three gauge bosons W{sup {+-}} and Z and, eight gluons g. Photons have no mass, the theory of Quantum Electrodynamics describe them very well and are responsible for mediation of the electromagnetic force between electrically charged particles. Gauge bosons are massive, being Z heavier than W{sup {+-}}. They are responsible for the mediation of the weak interactions between particles of different flavors but W{sup {+-}} act only on left-handed particles and right-handed antiparticles while Z with both left-handed particles and antiparticles. Due to the electric charge of W{sup {+-}}, they couple also to electromagnetic interactions. Photons and the three gauge bosons are grouped together and collectively mediate the electroweak interactions. Finally, gluons have no mass, the theory of Quantum Chromodynamics describe them and are responsible for the mediation of the strong interactions between particles with color charge. Having an effective color charge, gluons can interact among themselves. The Higgs Boson is the only particle in the SM without direct experimental evidence. Its detection would help in the explanation of the difference between massive bosons mediating the weak force and the massless photon mediating the electromagnetism.
![First Observation of an Exited Charm Baryon [omega] [suprascript]* [subscript]c Decaying to [omega] [suprascript]0 [subscript]c Y at the BABAR Experiment PDF](https://books.google.com/books/content/images/frontcover/coCawgEACAAJ?fife=w80-h100)
Author: Rahmi Bula
Publisher:
ISBN:
Category : Baryons
Languages : en
Pages : 115
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
Get Book Here
Book Description
In this report, I will mainly discuss baryon resonances with emphasis on the discovery of the [Omega]−. However, for completeness, I will also present some data on the meson resonances which together with the baryons led to the uncovering of the SU(3) symmetry of particles and ultimately to the concept of quarks.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 161
Get Book Here
Book Description
In this dissertation I describe a study of double-charm and charm-strange baryons based on data collected with the BABAR Detector at the Stanford Linear Accelerator Center. In this study I search for new baryons and make precise measurements of their properties and decay modes. I seek to verify and expand upon double-charm and charm-strange baryon observations made by other experiments. The BABAR Detector is used to measure subatomic particles that are produced at the PEP-II storage rings. I analyze approximately 300 million e+e- → c{bar c} events in a search for the production of double-charm baryons. I search for the double-charm baryons?{sub cc} (containing the quarks ccd) and?{sup ++}{sub cc} (ccu) in decays to?+{sub c}K−?+ and?+{sub c}K−?+?+, respectively. No statistically significant signals for their production are found, and upper limits on their production are determined. Statistically significant signals for excited charm-strange baryons are observed with my analysis of approximately 500 million e+e- → c{bar c} events. The charged charm-strange baryons?{sub c}(2970)+,?{sub c}(3055)+,?{sub c}(3123)+ are found in decays to?+{sub c}K−?+, the same decay mode used in the?+{sub cc} search. The neutral charm-strange baryon?{sub c}(3077)° is observed in decays to?+{sub c}K?−. I also search for excited charm-strange baryon decays to?+{sub c}K8,?+{sub c}K−,?+{sub c}K8?−?+, and?+{sub c}K−?−?+. No significant charm-strange baryon signals a f h these decay modes. For each excited charm-strange baryon state that I observe, I measure its mass, natural width (lifetime), and production rate. The properties of these excited charm-strange baryons and their decay modes provide constraints for phenomenological models of quark interactions through quantum chromodynamics. My discovery of the two new charm-strange baryons?{sub c}(3055)+ and?{sub c}(3123)+ influences our theoretical understanding of charm-strange baryon states.
Author: Brian Aa Petersen
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Get Book Here
Book Description
The authors report on several studies of charm baryon production and decays by the BABAR collaboration. They confirm previous observations of the {Xi}'{sub c}{sup 0/+}, {Xi}{sub c}(2980){sup +} and {Xi}{sub c}(3077){sup +} baryons, measure branching ratios for Cabibbo-suppressed {Lambda}{sub c}{sup +} decays and use baryon decays to study the properties of the light-quark baryons, {Omega}{sup -} and {Xi}(1690){sup 0}.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
Get Book Here
Book Description
We discuss the physics of B{sub s}° mesons focusing on CP violation in B{sub s}° → J/[Psi][phi] decays at the Tevatron. We summarize measurements of the properties of bottom baryons at the Tevatron including the [Sigma]{sub b} states and the [Xi]{sub b}− baryon. We also discuss the discovery of the [Omega]{sub b}− baryon.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
Get Book Here
Book Description
We review recent measurements of heavy B hadron states including masses and lifetimes of the B{sub c}− meson as well as excited B states (B**, B**{sub s}). We discuss properties of the B{sub s}° meson such as lifetime, lifetime difference [Delta][Lambda]{sub s}/[Lambda]{sub s} and CP violation in B{sub s}° → J/[psi][phi] decays. We also summarize new measurements of the masses and lifetimes of bottom baryons including the [Lambda]{sub b}° baryon, the [Sigma]{sub b} baryon states as well as the [Xi]{sub b}− and [Omega]{sub b}− baryons.
