Electromagnetic Structure of the Proton, Pion, and Kaon by High-Precision Form Factor Measurements at Large Timelike Momentum Transfers

Seth, K. K.; Dobbs, S.; Metreveli, Z.; Tomaradze, A.; Xiao, Ting; Bonvicini, G.

doi:10.1103/physrevlett.110.022002

Cited by 56 publications

(43 citation statements)

References 31 publications

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“…Our predictions for the EM form factor using the original (dotted-orange curve) and our higher twist spin-improved (continuous-red and dashed-blue curve) are compared with the data from CERN [56], CEA [57], Cornell [58][59][60], Jlab [61,62] and CLEO [63,64] in Figure 3. As can be seen, the agreement with data is very much improved with the spin-improved holographic wavefunctions.…”

Section: Em Form Factormentioning

confidence: 99%

Spin effects in the pion holographic light-front wavefunction

2017

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We account for dynamical spin effects in the holographic light-front wavefunction of the pion in order to predict the mean charge radius, r 2 π , the decay constant, f π , the spacelike electromagnetic form factor, F π (Q 2 ), the twist-2 pion Distribution Amplitude and the photon-to-pion transition form factor F γπ (Q 2 ). Using a universal fundamental AdS/QCD scale, κ = 523 MeV, and a constituent quark mass of 330 MeV, we find a remarkable improvement in describing all observables.

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Section: Em Form Factormentioning

confidence: 99%

Spin effects in the pion holographic light-front wavefunction

2017

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“…This leads to the serious problem that even the ratio 0` 0 Y , which is supposed to remove the dependence on the assumed identity of pion and kaon wave functions, and is predicted to be 0` 0 Y j 9`Q 9 Y Q j ! h , is (39 ± 4)% smaller than our measurement of 1.09 ± 0.04 for |Q 2 | = 17.4 GeV 2 [6]. With the precision of our measurements being at the level of ~5%, it is quite obvious that something is very wrong.…”

Section: Theoretical Implicationsmentioning

confidence: 40%

“…[12] show that timelike form factors are twice as large as the corresponding spacelike form factors [12]. Right panel: Including our new results in the 4 Q j g " GeV 2 region [6]. The timelike form factors remain factor two larger.…”

Section: Timelike Form Factors Of Protonsmentioning

confidence: 99%

“…For kaons no electroproduction data exist, and no spacelike form factors have been measured. In the following we present our excellent precision timelike form factor results for π and K at large Q 2 = 14.2 and 17.4 GeV 2 [6]. The data were taken with the CLEO-c detector for 4 N 4 O annihilation at %8 Y 3.772 GeV and 4.170 GeV with luminosities of 805 and 586 pb -1 , respectively.…”

Section: Form Factors Of Pions and Kaonsmentioning

confidence: 99%

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Form factors of pions, kaons & protons at the highest timelike momentum transfers & first measurements of hyperons

Seth

2015

EPJ Web of Conferences

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Abstract. Electromagnetic form factors of hadrons for timelike momentum transfers can be measured by particle-antiparticle annihilation into hadron-antihadron pairs. We have made the world's first high precision measurements of timelike form factors of ? and K mesons, and ground states of the baryons, protons, and the hyperons K K N K O and O at the high momentum transfers of 14.2 and 17.4 GeV 2 . Limitations of perturbative QCD are revealed, and evidence is presented for the effects of diquark correlations in K and K . PreambleAn elementary particle is defined, or should be defined, as one which is not composite. So, all we want to know about an elementary particle is its static properties, mass, charge, spin, etc. When, almost exactly 100 years ago, Rutherford discovered the nucleus, we had just two elementary particles, the electron, and the proton, and there was no question of their constituents. While the electron has remained elementary, we know today that nucleons, proton and neutron, are not. The nucleons are composite of three light, spin 1/2 (m<10 MeV each, charge +2/3 and -1/3) up and down quarks, which are bound by massless spin 1 gluons. Mesons are simpler, being composite of a quark and an antiquark, with the quarks being up, down, and strange.Hyperons are baryons like the nucleons, with one or more up/down quarks replaced by strange quarks, which are still rather light. Now that mesons and baryons are composite, we have to find answers to a lot of questions. Among them, the important ones are: a) How does one account for the masses of light quark mesons and baryons, their spins and their spatial and momentum distributions? b) How do kaons differ from pions, and hyperons differ from nucleons? c) What happens to the structure of a hadron when lots of momentum or energy is pumped into it from the outside? The questions are of fundamental importance, and they can only be answered by experimental measurements. The measurements in question are form factor measurements.We are all familiar with the fact that measurement of elastic scattering of electrons from nuclei and nucleons is related to spacelike electric and magnetic form factors, and they have provided direct insight into the spatial distribution of charges and currents in the nuclei, and in the nucleon. Unfortunately, this can only be done for protons and nuclei which are available as targets. Other a H PDLO NVHWK#QRUWKZHVWHUQ HGX

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Section: Form Factors Of Pions and Kaonsmentioning

confidence: 98%

Form factors of pions, kaons & protons at the highest timelike momentum transfers & first measurements of hyperons

Seth

2015

EPJ Web of Conferences

Self Cite

View full text Add to dashboard Cite

Abstract. Electromagnetic form factors of hadrons for timelike momentum transfers can be measured by particle-antiparticle annihilation into hadron-antihadron pairs. We have made the world's first high precision measurements of timelike form factors of ? and K mesons, and ground states of the baryons, protons, and the hyperons PreambleAn elementary particle is defined, or should be defined, as one which is not composite. So, all we want to know about an elementary particle is its static properties, mass, charge, spin, etc. When, almost exactly 100 years ago, Rutherford discovered the nucleus, we had just two elementary particles, the electron, and the proton, and there was no question of their constituents. While the electron has remained elementary, we know today that nucleons, proton and neutron, are not. The nucleons are composite of three light, spin 1/2 (m<10 MeV each, charge +2/3 and -1/3) up and down quarks, which are bound by massless spin 1 gluons. Mesons are simpler, being composite of a quark and an antiquark, with the quarks being up, down, and strange. Hyperons are baryons like the nucleons, with one or more up/down quarks replaced by strange quarks, which are still rather light. Now that mesons and baryons are composite, we have to find answers to a lot of questions. Among them, the important ones are: a) How does one account for the masses of light quark mesons and baryons, their spins and their spatial and momentum distributions? b) How do kaons differ from pions, and hyperons differ from nucleons? c) What happens to the structure of a hadron when lots of momentum or energy is pumped into it from the outside? The questions are of fundamental importance, and they can only be answered by experimental measurements. The measurements in question are form factor measurements.We are all familiar with the fact that measurement of elastic scattering of electrons from nuclei and nucleons is related to spacelike electric and magnetic form factors, and they have provided direct insight into the spatial distribution of charges and currents in the nuclei, and in the nucleon. Unfortunately, this can only be done for protons and nuclei which are available as targets.

show abstract

Electromagnetic Structure of the Proton, Pion, and Kaon by High-Precision Form Factor Measurements at Large Timelike Momentum Transfers

Cited by 56 publications

References 31 publications

Spin effects in the pion holographic light-front wavefunction

Spin effects in the pion holographic light-front wavefunction

Form factors of pions, kaons & protons at the highest timelike momentum transfers & first measurements of hyperons

Form factors of pions, kaons & protons at the highest timelike momentum transfers & first measurements of hyperons

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