Large-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mrow><mml:mi>⊥</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Spin Effects 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:mo>→</mml:mo><mml:mi>p</mml:mi><mml:mo>+</mml:mo><

Peaslee, D. C.; O’Fallon, J. R.; Simonius, M.; Danby, G. T.; Lee, Y. Y.; Ratner, L. G.; Bruni, R.; Cameron, P.; Crabb, D.; Hejazifar, M. E.; Krisch, A. D.; Lin, A. M. T.; Raymond, R. S.; Terwilliger, K. M.

doi:10.1103/physrevlett.51.2359

Cited by 31 publications

(11 citation statements)

References 9 publications

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“…The quality of the present data is poor and prevents any severe test of our predictions. The predicted asymmetry amounts to about 20-30% for |t| > 6 GeV 2 ; it is of the same order of magnitude as has been observed in the low-energy BNL experiment[3]. The decrease of the asymmetry at smaller momentum transfer is connected with the smallness of ReF +− near |t| = 3 GeV 2 .…”

supporting

confidence: 75%

“…Experimentally, there are many observations of large spin effects at high energies and moderately large momentum transfer [2]. Sizeable differences between the cross sections for different spin orientations of the initial state protons as well as large double-spin, A N N , and single-spin, A N , transverse asymmetries have been observed in the BNL experiment [3] for beam momenta p B less than 28 GeV. The FNAL experiment [4] finds values for A N of about 10-20% at p B = 200 GeV and momentum transfers |t| ≥ 2 GeV 2 .…”

Section: Introductionmentioning

confidence: 99%

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Spin effects in high-energy proton-proton scattering within a diquark model

Goloskokov

Kroll

1999

Phys. Rev. D

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supporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Spin effects in high-energy proton-proton scattering within a diquark model

Goloskokov

Kroll

1999

Phys. Rev. D

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“…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 [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. That is convincing evidence that the observed experimental regularities are not explained by the SD model.…”

Section: The Endpoint Overlap Modelmentioning

confidence: 97%

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

2014

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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...

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“…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 [84,43], and three competing terms in single-polarization measurements [44,45,46,47,48]. Here I ignore the behavior of the analyzing power in the very soft region (where it is nonzero but small), and include two scalar complex terms, and two imaginary spin-orbit terms.…”

Section: Fit Of Scalar and Spin-orbit Interaction Termsmentioning

confidence: 99%

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.

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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.

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Large-P⊥2Spin Effects inp+p→p+<

Cited by 31 publications

References 9 publications

Spin effects in high-energy proton-proton scattering within a diquark model

Spin effects in high-energy proton-proton scattering within a diquark 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

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