The Contrast 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 The Contrast PDF full book. Access full book title The Contrast by . Download full books in PDF and EPUB format.

The Contrast

Author:
Publisher:
ISBN:
Category : Local option
Languages : en
Pages : 2

Book Description

The Contrast

Author:
Publisher:
ISBN:
Category : Local option
Languages : en
Pages : 2

Book Description

The Epem to Pi+ Pi- Pi+ Pi-, K+ K- Pi+ Pi-, and K+ K- K+ K- Cross Sections at Center-of-Mass Energies 0.5--4.5G̃eV Measured with Initial-State Radiation

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
We study the process ee− 2!?+?−?+?−?, with a hard photon radiated from the initial state. About 60,000 fully reconstructed events have been selected from 89 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the effective e+e− center-of-mass energy, so that these data can be compared with the corresponding direct e+e− measurements. From the 4?-mass spectrum, the cross section for the process e+e− 2!?+?−?+?− is measured for center-of-mass energies from 0.6 to 4.5 GeV. The uncertainty in the cross section measurement is typically 5%. We also measure the cross sections for the final states K+K−?+− and K+K−K+K−. We observe the J/? in all three final states and measure the corresponding branching fractions. We search for X(3872) in J/?(2!?+?−)?+?− and obtain an upper limit on the product of the e+e− width of the X(3872) and the branching fraction for X(3872) 2!J/??+?−.

Measurement of the E+ E- to Pi+ Pi- Pi+ Pi-, K+ K- Pi+ Pi-, K+ K- K+ K- Cross Sections Using Initial State Radiation at BaBar

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
First results of a study of the ee− → ?+?−?+?−? process with hard photon emitted from initial state are presented. About 60000 fully reconstructed events have been selected based on 89.3 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the effective collision c.m. energy, and so BABAR ISR data can be compared to the relevant direct e+e− measurements. From obtained 4? mass spectrum we evaluate e+e− → ?+?−?+?− cross section for the range of c.m.s. energy from 0.6 to 4.5 GeV. The systematic error of the cross section measurement is 5% and comparable with the best e+e− data. The cross sections for identified 2K2? and 4K final states also have been presented.

The E^+e^- -] 3(\pi^+\pi^- ), 2(\pi^+\pi^-\pi^0) and K^+K^-2(\pi^+\pi^- ) Cross Sections at Center-of-Mass Energies 0.5--4.5 GeV Measured with Initial-StateRadiation

$The E^+e^- -] 3(\pi^+\pi^- ), 2(\pi^+\pi^-\pi^0) and K^+K^-2(\pi^+\pi^- ) Cross Sections at Center-of-Mass Energies 0.5--4.5 GeV Measured with Initial-StateRadiation PDF$ Author: B. Aubert
Publisher:
ISBN:
Category :
Languages : en
Pages : 26

Book Description
We study the processes e{sup +}e{sup -} {yields} 3({pi}{sup +}{pi}{sup -}){gamma}, 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}){gamma} and K{sup +}K{sup -} 2({pi}{sup +} {sup -}){gamma}, with the photon radiated from the initial state. About 20,000, 33,000 and 4,000 fully reconstructed events, respectively, have been selected from 232 fb{sup -1} of BABAR data. The invariant mass of the hadronic final state defines the effective e{sup +}e{sup -} center-of-mass energy, so that these data can be compared with the corresponding direct e{sup +}e{sup -} measurements. From the 3({pi}{sup +}{pi}{sup -}), 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}) and K{sup +}K{sup -} 2({pi}{sup +}{pi}{sup -}) mass spectra, the cross sections for the processes e{sup +}e{sup -} {yields} 3({pi}{sup +}{sup -}), e{sup +}e{sup -} {yields} 2({pi}{sup +}{pi}{sup -}{pi}{sup 0}) and e{sup +}e{sup -} {yields} K{sup +}K{sup -} 2({pi}{sup +}{pi}{sup -}) are measured for center-of-mass energies from production threshold to 4.5 GeV. The uncertainty in the cross section measurement is typically 6-15%. We observe the J/{psi} in all these final states and measure the corresponding branching fractions.

Cross Sections for the Reactions E+e to K+ K- Pi+pi-, K+ K- Pi0pi0, and K+ K- K+ K- Measured Using Initial-State Radiation

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 35

Book Description
We study the processes ee− 2!K+K−?+?-?, K+K−?°?°?, and K+K−K+K−?, where the photon is radiated from the initial state. About 84000, 8000, and 4200 fully reconstructed events, respectively, are selected from 454 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the e+e− center-of-mass energy, so that the K+K−?+?−? data can be compared with direct measurements of the e+e− 2!K+K−?+?− reaction. No direct measurements exist for the e+e− 2!K+K−?°?° or e+e− 2!K+K−K+K− reactions, and we present an update of our previous result with doubled statistics. Studying the structure of these events, we find contributions from a number of intermediate states, and extract their cross sections. In particular, we perform a more detailed study of the e+e− 2!?(1020)??? reaction, and confirm the presence of the Y (2175) resonance in the?(1020)f0(980) and K+K− f0(980) modes. In the charmonium region, we observe the J/? in all three final states and in several intermediate states, as well as the?(2S) in some modes, and measure the corresponding branching fractions.

The E+e- to to K+ K- \pi+\pi-, K+ K- \pi0\pi0 and K+ K- K+ K- Cross Sections Measured with Initial-State Radiation

$The E+e- to to K+ K- \pi+\pi-, K+ K- \pi0\pi0 and K+ K- K+ K- Cross Sections Measured with Initial-State Radiation PDF$ Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 32

Book Description
We study the processes e+e− → K+K−?+?−?, K+K−?°?°? and K+K−K+K−?, where the photon is radiated from the initial state. About 34600, 4400 and 2300 fully reconstructed events respectively, are selected from 232 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the effective e+e− center-of-mass energy, so that the K+K−?+?−? data can be compared with direct measurements of the e+e− → K+K−?+?−? reaction; no direct measurements exist for the e+e− → K+K−?°?°? or e+e− → K+K−K+K− reactions. Studying the structure of these events, we find contributions from a number of intermediate states, and we extract their cross sections where possible. In particular, we isolate the contribution from e+e− → ?(1020)f0(980) and study its structure near threshold. In the charmonium region, we observe the J/? in all three final states and several intermediate states, as well as the ?/(2S) in some modes, and measure the corresponding branching fractions. We see no signal for the Y(4260) and obtain an upper limit of ?{sub Y(4260)→??+?−} · ?{sub ee}{sup Y}

The Contrast PDF Download

The Contrast

The Contrast

The Epem to Pi+ Pi- Pi+ Pi-, K+ K- Pi+ Pi-, and K+ K- K+ K- Cross Sections at Center-of-Mass Energies 0.5--4.5G̃eV Measured with Initial-State Radiation

Measurement of the E+ E- to Pi+ Pi- Pi+ Pi-, K+ K- Pi+ Pi-, K+ K- K+ K- Cross Sections Using Initial State Radiation at BaBar

The E^+e^- -] 3(\pi^+\pi^- ), 2(\pi^+\pi^-\pi^0) and K^+K^-2(\pi^+\pi^- ) Cross Sections at Center-of-Mass Energies 0.5--4.5 GeV Measured with Initial-StateRadiation

Cross Sections for the Reactions E+e to K+ K- Pi+pi-, K+ K- Pi0pi0, and K+ K- K+ K- Measured Using Initial-State Radiation

The E+e- to to K+ K- \pi+\pi-, K+ K- \pi0\pi0 and K+ K- K+ K- Cross Sections Measured with Initial-State Radiation

Initial-State Radiation Measurement of the E+e- -] Pi+pi-pi+pi- Cross Section

Measurement of the E + E - Pi + Pi - Cross Section Using Initial State Radiation at BESIII

Total and Differential [pi-pi] Cross Sections in [pi-rho] Interactions at 1.25 Bev/c

Pi − + P2 Pi0 + N Charge Exchange Cross Sections at 20.7 and S1.0 Mev