Spin Analyzing Power in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>−</mml:mo><mml:mi>p</mml:mi></mml:math>Elastic Scattering at 28 GeV/<i>c</i>

Hansen, P. H.; O’Fallon, J. R.; Danby, G. T.; Lee, Y. Y.; Ratner, L. G.; Peaslee, D. C.; Perlmutter, Arnold; Cameron, P.; Crabb, D.; Fujisaki, M.; Hejazifar, M. E.; Krisch, A. D.; Lin, A. M. T.; Linn, S.; Shima, T.; Terwilliger, K. M.

doi:10.1103/physrevlett.50.802

Cited by 20 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These tests are much less demanding than asymptotic limits, and apply to an expansion of leading power behavior. The tests fail in almost every case experiments exist [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44]. That is convincing evidence that the observed experimental regularities are not explained by the S D model.…”

Section: The Endpoint-overlap Modelsupporting

confidence: 51%

Uncovering the scaling laws of hard exclusive hadronic processes in a comprehensive endpoint model

2014

View full text Add to dashboard Cite

We show that an endpoint-overlap model can explain the scaling laws observed in exclusive hadronic reactions at large momentum transfer. The model assumes one of the valence quarks carries most of the hadron momentum. Hadron form factors and fixed-angle scattering are related directly to the quark wave function, which can be directly extracted from experimental data. A universal linear endpoint behavior explains the proton electromagnetic form factor, proton-proton fixed-angle scattering, and the t-dependence of proton-proton scattering at large s >> t. Endpoint constituent counting rules relate the number of quarks in a hadron to the power-law behavior. All proton reactions surveyed are consistent with three quarks participating. The model is applicable at laboratory energies and does not need assumptions of asymptotically high energy regime. A rich phenomenology of lepton-hadron scattering and hadron-hadron scattering processes is found in remarkably simple relationships between diverse processes. Experimental regularitiesThe experimental study of differential cross sections of hard exclusive hadronic reactions at high energy reveals a remarkable pattern: They are described by power laws [1][2][3]. A model explanation exists [4][5][6][7], yet it is not satisfactory [8] at the energies of experimental measurements. We are driven to find a consistent explanation of experimental regularities by re-examining all the facts from a fresh point of view."Hard" reactions are those which depend on a single large scale Q 2 > GeV 2 , or several large scales with a fixed ratio. It is remarkable that the proton electromagnetic form factor a e-mail: sumeetkd@iitk.ac.in b e-mail: pkjain@iitk.ac.in c e-mail: ralston@ku.edu F 1 (Q 2 ) agrees well with a decreasing power of Q 2 for Q 2 5 GeV 2 [9]. For large momentum transfer, it is remarkable that pp → pp fixed-angle cross section dσ/dt agrees well with a decreasing power of Q 2 ∼ s [10], where √ s is the center of mass energy. There are many other examples.We have re-evaluated the phenomenology of power-law dependence or "scaling laws" for exclusive reactions. Due to history, the most simple and plausible explanation failed to be developed. The model appears in the literature as the Feynman process, also known as the Drell-Yan model, also known as the endpoint-overlap model [11][12][13]. There is much to be learned and much that is new when the model is objectively explored. The endpoint-overlap modelBefore engaging the technical analysis, a brief synopsis of history is appropriate. It is fair to observe that relatively few papers in recent years have supported the short-distance model that dominated attention earlier. How and why did consideration of soft processes in hard scattering take so long to develop? In their evaluation of the endpoint region, Brodsky and Mueller [14] wrote that "its contribution depends sensitively on the hadronic wave functions". The discussion discovered no actual fault in the endpoint contribution. Instead of finding a flaw, the section end...

show abstract

Section: The Endpoint-overlap Modelsupporting

confidence: 51%

Uncovering the scaling laws of hard exclusive hadronic processes in a comprehensive endpoint model

2014

View full text Add to dashboard Cite

show abstract

“…A well-measured SSA in an exclusive channel is the normal vector analyzing power measured in elastic proton-proton scattering at energy 20-30 GeV and Q T = 1-3 GeV/c (see [43][44][45][46][47][48]).…”

Section: General Backgroundmentioning

confidence: 99%

“…Whichever the model, more analogous terms must be summed to reproduce it. Indeed, data show interference between at least two competing terms in elastic scattering [43,84], and three competing terms in single-polarization measurements [44][45][46][47][48].…”

Section: Fit Of Scalar and Spin-orbit Interaction Termsmentioning

confidence: 99%

“…In other words, the same longitudinal range is attributed to all the terms of interest here. [44][45][46][47][48].…”

Section: Fit Of Scalar and Spin-orbit Interaction Termsmentioning

confidence: 99%

“…So spin-orbit terms are constrained by the data in figure 8 only. This figure reports data points from several experiments measuring the proton-proton normal spin analyzing power at 20-30 GeV beam energy [44][45][46][47][48].…”

Section: Fit Of Scalar and Spin-orbit Interaction Termsmentioning

confidence: 99%

See 2 more Smart Citations

Extraction of finite-energy contributions to the Sivers asymmetry from the analysis of exclusive proton–proton scattering

Bianconi¹

2008

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

I study the effect of scalar and spin-orbit rescattering terms, in the production of a nonzero Sivers-like asymmetry in proton-proton collisions (inclusive production and Drell-Yan) at moderate center of mass energies √ s < 15 GeV and transverse momentum up to 3 GeV/c. An ultrarelativistic generalization of the Glauber formalism is here used to (i) fit the scalar and spin-orbit interaction terms on proton-proton elastic scattering data, including analyzing power, (ii) transfer such information to inclusive proton-proton scattering. It is shown that the phenomenological interactions responsible for the nonzero analyzing power in protonproton elastic scattering produce a relevant nonzero analyzing power in inclusive processes associated with proton-proton collisions. This could represent a relevant (possibly higher-twist) contribution to the Sivers asymmetry.

show abstract

A baryon standard model for electroweak and strong interactions

Rączka

Differential Geometry, Group Representations, and Quantization

View full text Add to dashboard Cite

Spin Analyzing Power inp−pElastic Scattering at 28 GeV/c

Cited by 20 publications

References 12 publications

Uncovering the scaling laws of hard exclusive hadronic processes in a comprehensive endpoint model

Uncovering the scaling laws of hard exclusive hadronic processes in a comprehensive endpoint model

Extraction of finite-energy contributions to the Sivers asymmetry from the analysis of exclusive proton–proton scattering

A baryon standard model for electroweak and strong interactions

Contact Info

Product

Resources

About