Measurement of Tensor Polarization and Cross Section for the Reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow

Holt, R. J.; Specht, Janet K.; Stephenson, E.J.; Zeidman, B.; Burman, R. L.; Frank, James S.; Leitch, M. J.; Moses, J. D.; Yates-Williams, M. A.; Laszewski, R.M.; Redwine, R.

doi:10.1103/physrevlett.43.1229

Cited by 66 publications

(6 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is in the tensor polarization T2o(Lab) measurements that the dis crepancy between theory and data stands out. The early measurements at LAMPF (188), in which recoil deuterons were analyzed by means of a second scattering in a 3 He cell polarimeter utilizing the 3He(d,p)4He reac tion, were confirmed by a similar experiment at TRIUMF (189). More recently, agreement with these data has been obtained by a second group working at TRIUMF and using an entirely different experimental tech nique.…”

Section: Pion-deuteron Polarizationsmentioning

confidence: 83%

Pion-Nucleus Interactions

Gibbs¹,

Gibson²

1987

Annu. Rev. Nucl. Part. Sci.

View full text Add to dashboard Cite

Section: Pion-deuteron Polarizationsmentioning

confidence: 83%

Pion-Nucleus Interactions

Gibbs¹,

Gibson²

1987

Annu. Rev. Nucl. Part. Sci.

View full text Add to dashboard Cite

“…(17) and (18), we obtain for f (2) πd the expression of the type f (2) πd ∼ I ij Q ij . Let us rewrite the amplitudes f (1) πd and f (2) πd in the form:…”

Section: Spin-flip Amplitudementioning

confidence: 95%

“…Figure captions Experimental data are from [7] (open circles), [6] (open triangles), [3] (filled triangles), [9] (filled circles), [2] (open diamonds), [5] (stars), [4] (filled squares), and [8] (filled diamonds). …”

Section: +1mentioning

confidence: 99%

See 1 more Smart Citation

Charge symmetry violation effects in pion scattering off the deuteron

et al. 2000

View full text Add to dashboard Cite

We discuss the theoretical and experimental situations for charge symmetry violation (CSV) effects in the elastic scattering of π + and π − on deuterium (D) and 3 He/ 3 H. Accurate comparison of data for both types of targets provides evidence for the presence of CSV effects. While there are indications of a CSV effect in deuterium, it is much more pronounced in the case of 3 He/ 3 H. We provide a description of the CSV effect on the deuteron in terms of single-and double-scattering amplitudes. The ∆-mass splitting is taken into account. Theoretical predictions are compared with existing experimental data for π − d scattering; a future article will speak to the π-three nucleon case.

show abstract

“…From the experimental side, the early data 5,6 for the vector analyzing power /T n contained strong oscillations which were interpreted as dibaryon resonance signals, 7,8 although in a new comprehensive set of measurements this oscillatory behavior has now disappeared. 9 In the case of the tensor polarization t 20 , two different groups have measured contradictory sets of data at 7^ = 140 MeV and 100° < 0 n < 180°; Holt and coworkers 10,11 found that t 20 was negative with values of t 2 o 0.4, while Gruebler and co-workers 12,13 found that t 20 was strongly oscillatory with values of 0< t 20 <0.6, an d where again the strong oscillations were interpreted as a dibaryon resonance signal. Finally, a recent set of measurements of t 2 o at four energies 14 found the interesting result that if the calculations were performed including pion absorption, they did not fit the data, while the theoretical results looked quite reasonable if pion absorption was neglected.…”

Section: Understanding Polarization Observables In Pion-deuteron Scatmentioning

confidence: 99%

Understanding Polarization Observables in Pion-Deuteron Scattering

Garcilazo

1984

Phys. Rev. Lett.

View full text Add to dashboard Cite

With the same relativistic three-body theory which reproduces the pion-deuteron elastic and breakup differential cross sections, it is also possible to explain the energy and angular dependence of the reaction parameters iT n and t 2 o throughout the region of the 3,3 resonance. This theory differs from other models in that it treats relativistically not only the space variables but also the spin variables and it has a much smaller contribution from pion absorption.PACS numbers: 25.80. Dj, 24.70.+s, 25.10.+s Presently, the theoretical and experimental situation of polarized pion-deuteron scattering can be said to be one of considerable confusion. On the theoretical side, the predictions from various groups differ greatly, mainly as a result of the particular way in which they treat the pion-absorption channel, 1 " 4 although other problems arise if they include relativistic kinematics for the three particles 1,3 or only the pion. 2 Also, even though for polarization reactions the spin degrees of freedom are the most relevant variables, all of these models treat the spin nonrelativistically; that is, they assume that a spinor in a given reference frame looks the same when it is observed from another reference frame. From the experimental side, the early data 5,6 for the vector analyzing power /T n contained strong oscillations which were interpreted as dibaryon resonance signals, 7,8 although in a new comprehensive set of measurements this oscillatory behavior has now disappeared. 9 In the case of the tensor polarization t 20 , two different groups have measured contradictory sets of data at 7^ = 140 MeV and 100° < 0 n < 180°; Holt and coworkers 10,11 found that t 20 was negative with values of t 2 o 0.4, while Gruebler and co-workers 12,13 found that t 20 was strongly oscillatory with values of 0< t 20 <0.6, an d where again the strong oscillations were interpreted as a dibaryon resonance signal. Finally, a recent set of measurements of t 2 o at four energies 14 found the interesting result that if the calculations were performed including pion absorption, they did not fit the data, while the theoretical results looked quite reasonable if pion absorption was neglected. I will try in the following to clarify this present situation of confusion.In two previous Letters 15,16 I have described a relativistic three-body model and have used it successfully to explain the elastic and breakup differential cross sections in the region of the 3,3 resonance. In this model, the relativistic Faddeev equations are solved with the pion-nucleon interaction represented by the six S-and P-wave channels and the nucleon-nucleon interaction by the two S-wave channels. It assumes separable T matrices tip, p'\s) = g(p)T(s)g(p') which are normalized to the experimental phase shifts and inelasticities and are extended to the off-shell region by means of form factors gip) : =p l /ia 2 + p 2 ), where a is taken to be 1 GeV/cfor the pion-nucleon channels 17 " 19 and equal to the Yamaguchi values 20 for the nucleon-nucleon channels after t...

show abstract

Measurement of Tensor Polarization and Cross Section for the ReactionH2(π

Cited by 66 publications

References 11 publications

Pion-Nucleus Interactions

Pion-Nucleus Interactions

Charge symmetry violation effects in pion scattering off the deuteron

Understanding Polarization Observables in Pion-Deuteron Scattering

Contact Info

Product

Resources

About