Form factor in K{sup +}{yields}{pi}{sup +}{pi}{sup 0}{gamma}: Interference versus direct emission

doi:10.1103/PHYSREVD.75.094014

Title: Form factor in K{sup +}{yields}{pi}{sup +}{pi}{sup 0}{gamma}: Interference versus direct emission

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Abstract

We analyze the effect of a form factor in the magnetic contribution to K{sup +}{yields}{pi}{sup +}{pi}{sup 0}{gamma}. We emphasize how this can show up experimentally; in particular, we try to explore the difference between a possible interference contribution and a form factor in the magnetic part. The form factor used for K{sup +}{yields}{pi}{sup +}{pi}{sup 0}{gamma} is analogous to the one for K{sub L}{yields}{pi}{sup +}{pi}{sup -}{gamma}, experimentally well established.

Authors:

Cappiello, Luigi ^[1]; Dipartimento di Scienze Fisiche, Universita di Napoli 'Federico II', Via Cintia, 80126 Naples ^[2]; D'Ambrosio, Giancarlo ^[1]

INFN-Sezione di Napoli, Via Cintia, 80126 Naples (Italy)
(Italy)

Publication Date:: Tue May 01 00:00:00 EDT 2007

OSTI Identifier:: 21020486

Resource Type:: Journal Article

Resource Relation:: Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.75.094014; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; EMISSION; FORM FACTORS; INTERFERENCE; KAONS NEUTRAL LONG-LIVED; KAONS PLUS; PARTICLE DECAY; PHOTONS; PIONS MINUS; PIONS NEUTRAL; PIONS PLUS

Citation Formats


                    Cappiello, Luigi, Dipartimento di Scienze Fisiche, Universita di Napoli 'Federico II', Via Cintia, 80126 Naples, and D'Ambrosio, Giancarlo. Form factor in K{sup +}{yields}{pi}{sup +}{pi}{sup 0}{gamma}: Interference versus direct emission.  United States: N. p., 2007. 
        Web.  doi:10.1103/PHYSREVD.75.094014.

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                    Cappiello, Luigi, Dipartimento di Scienze Fisiche, Universita di Napoli 'Federico II', Via Cintia, 80126 Naples, & D'Ambrosio, Giancarlo. Form factor in K{sup +}{yields}{pi}{sup +}{pi}{sup 0}{gamma}: Interference versus direct emission.  United States.  doi:10.1103/PHYSREVD.75.094014.

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                    Cappiello, Luigi, Dipartimento di Scienze Fisiche, Universita di Napoli 'Federico II', Via Cintia, 80126 Naples, and D'Ambrosio, Giancarlo. Tue .  
        "Form factor in K{sup +}{yields}{pi}{sup +}{pi}{sup 0}{gamma}: Interference versus direct emission".  United States.  
        doi:10.1103/PHYSREVD.75.094014.

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@article{osti_21020486,

  title        = {Form factor in K{sup +}{yields}{pi}{sup +}{pi}{sup 0}{gamma}: Interference versus direct emission},

  author       = {Cappiello, Luigi and Dipartimento di Scienze Fisiche, Universita di Napoli 'Federico II', Via Cintia, 80126 Naples and D'Ambrosio, Giancarlo},

  abstractNote = {We analyze the effect of a form factor in the magnetic contribution to K{sup +}{yields}{pi}{sup +}{pi}{sup 0}{gamma}. We emphasize how this can show up experimentally; in particular, we try to explore the difference between a possible interference contribution and a form factor in the magnetic part. The form factor used for K{sup +}{yields}{pi}{sup +}{pi}{sup 0}{gamma} is analogous to the one for K{sub L}{yields}{pi}{sup +}{pi}{sup -}{gamma}, experimentally well established.},

  doi          = {10.1103/PHYSREVD.75.094014},

  journal      = {Physical Review. D, Particles Fields},

  number       = 9,

  volume       = 75,

  place        = {United States},

  year         = {Tue May 01 00:00:00 EDT 2007},

  month        = {Tue May 01 00:00:00 EDT 2007}

}

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Journal Article:

DOI: 10.1103/PHYSREVD.75.094014

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Experimental study of the rare K$sup +$ decay modes: K$sup +$ $Yields$ $pi$$sup +$$pi$$sup 0$$gamma$, K$sup +$ $Yields$ $mu$$sup +$$pi$$sup 0$$nu$$gamma$, K$sup +$ $Yields$ $pi$$sup +$$gamma$$gamma$, K$sup +$ $Yields$ $pi$$sup +$$nu$nu-bar, K$sup +$ $Yields$ $pi$$sup 0$$pi$$sup 0$e$sup +$$nu$, and K$sup +$ $Yields$ e$sup +$$pi$$sup 0$$nu$$gamma$

Ljung, D. ; Cline, D. - Phys. Rev., D, v. 8, no. 5, pp. 1307-1330
A MEASUREMENT OF THE RATIOS OF THE RATES K$sup 0$/sub L/ $Yields$ 3$pi$$sup 0$/K$sup 0$/sub L/ $Yields$ $pi$$sup +$$pi$$sup -$$pi$$sup 0$, K$sup 0$/sub L/$Yields$ 3$pi$$sup 0$/K$sup 0$/sub L/ $Yields$ ALL CHARGED MODES AND K$sup 0$/sub L/ $Yields$ $pi$$mu$$nu$/K$sup 0$/sub L/ $Yields$ $pi$e$nu$, AND TESTS OF THE $delta$I = 1/2 RULE.

Budagov, I.A. ; Burmeister, H. ; Cundy, D.C. - Nuovo Cim., 57A: 182-9(Sept. 1, 1968).
Experimental study of direct photon emission in K/it{sup -} {sup {yields}} {pi}{sup -}{pi}{sup 0}{gamma} decay using ISTRA+ detector

Uvarov, V. A. ; Akimenko, S. A. ; Bolotov, V. N. ; ... - Physics of Atomic Nuclei

The branching ratio in the charged-pion-kinetic-energy region of 55 to 90 MeV for the direct photon emission in the K{sup -} {sup {yields}} {pi}{sup -}{pi}{sup 0}{gamma} decay has been measured using in-flight decays detected with the ISTRA+ setup operating in the 25-GeV/c negative secondary beam of the U-70 PS. The value Br(DE)=[0.37{+-}0.39(stat.){+-}0.10(syst.)]x10{sup -5} obtained from the analysis of 930 completely reconstructed events is consistent with the average value of two stopped-kaon experiments, but it differs by 2.5 standard deviations from the average value of three in-flight-kaon experiments. The result is also compared with recent theoretical predictions.
DOI: 10.1134/S1063778806010042
Field-theoretic calculation of the direct-emission amplitude in K$sup +-$ $Yields$ $pi$$sup +-$$pi$$sup 0$$gamma$

Dominguez, C.A. ; Zepeda, A. - Phys. Rev., D, v. 8, no. 11, pp. 4203-4205

We show that to order eg/sup 2/G the direct-emission amplitude in the decay K/sup plus or minus / yields pi /sup plus or minus / pi /sup o/ gamma is logarithmically divergent. ( auth)
STUDY OF K$sub 1$$sup 0$ $Yields$ $pi$$sup 0$$pi$$sup 0$ AND K$sub 2$$sup 0$ $Yields$ $pi$$sup 0$$pi$$sup 0$ INTERFERENCE.

Gobbi, B. ; Green, D. ; Hakel, W. ; ... - Phys. Rev. Lett., 22: 685-8(Mar. 31, 1969).