Single spin asymmetry <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:mrow><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:math> in polarized proton–proton elastic scattering at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn><mml:mtext> </mml:mtext><mml:mtext>GeV</mml:mtext></mml:math>

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doi:10.1016/j.physletb.2013.01.014

Cited by 43 publications

(29 citation statements)

References 25 publications

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“…In this model pomeron exchange is effectively treated as the exchange of a rank-2 symmetric tensor. In [19] we show that the tensor pomeron is consistent with the STAR pp elastic scattering data [20]. In Ref.…”

Section: Introductionsupporting

confidence: 72%

Exclusive diffractive production ofπ⁺π⁻continuum and resonances within tensor pomeron approach

2016

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Abstract. We discuss exclusive central diffractive dipion production in proton-(anti)proton collisions at high energies. The calculation is based on a tensor pomeron model and the amplitudes for the processes are formulated in an effective field-theoretic approach. We include the purely diffractive dipion continuum, and the scalar and tensor resonances decaying into the π + π − pairs as well as the photoproduction contributions (ρ 0 , Drell-Söding). We discuss how two pomerons couple to tensor meson f 2 (1270) and the interference effects of resonance and dipion continuum. The theoretical results are compared with CDF and CMS experimental data. We show the influence of the experimental cuts on the integrated cross section and on various differential distributions for outgoing particles. We find that the relative contribution of resonant f 2 (1270) and dipion continuum strongly depends on the cut on proton transverse momenta (or four-momentum transfer squared t 1,2 ) which may explain some controversial observations made by different ISR experiments in the past. The cuts may play then the role of a ππ resonance filter. We suggest some experimental analyses to fix model parameters related to the pomeron-pomeron-meson coupling.

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Section: Introductionsupporting

confidence: 72%

Exclusive diffractive production ofπ⁺π⁻continuum and resonances within tensor pomeron approach

2016

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“…from the TOTEM experiment [6], call for a revision [7]. However, the accuracy of existing polarized high energy experimental data [8][9][10][11] was insufficient to identify a Pomeron contribution, if any, to the pp spin-dependent amplitudes.In this Letter, we report new measurements of the single spin A N (t) and double spin A NN (t) analyzing powers in the small angle elastic collision of RHIC's polarized proton beams with Polarized Atomic Hydrogen Gas Jet Target [15](HJET) at √ s = 13.76 and 21.92 GeV. The precision has been significantly improved compared to previous HJET publications [9,10] and this has allowed us to not only isolate hadronic spin-flip amplitudes but also to incorporate spin dependence in a Regge pole anal-…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Precision Small Scattering Angle Measurements of Elastic Proton-Proton Single and Double Spin Analyzing Powers at the RHIC Hydrogen Jet Polarimeter

et al. 2019

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The Polarized Atomic Hydrogen Gas Jet Target polarimeter is employed by the Relativistic Heavy Ion Collider (RHIC) to measure the absolute polarization of each colliding proton beam. Polarimeter detectors and data acquisition were upgraded in 2015 to increase solid angle, energy range and energy resolution. These upgrades and advanced systematic error analysis along with improved beam intensity and polarization in RHIC runs 2015 (E beam = 100 GeV) and 2017 (255 GeV) allowed us to greatly reduce the statistical and systematic uncertainties for elastic spin asymmetries, AN(t) and ANN(t), in the Coulomb-nuclear interference momentum transfer range 0.0013 < −t < 0.018 GeV 2 . For the first time hadronic single spin-flip r5 and double spin-flip r2 amplitude parameters were reliably isolated at these energies and momentum transfers. Measurements at two beam energies enable a separation of Pomeron and Regge pole contributions to r5(s) and r2(s), indicating that the spin component may persist at high energies.PACS numbers: 24.70.+s, 25.40.Cm, 29.25.Pj.Introduction.-Study of the spin-averaged elastic pp hadronic amplitude at high energies has a more than 50 year history [1] and is continuing at the Large Hadron Collider. An essential contribution to this study relates to forward scattering for which the optical theorem and Coulomb-nuclear interference (CNI) provide an opportunity to separate the real and imaginary parts of an amplitude. Regge theory, based on the analyticity of a scattering amplitude, is a recognized method of understanding the energy dependence of amplitudes [2].An explanation of the unexpected discovery in the seventies of a growing pp cross section at high energies [3] was found [4] in the Pomeron concept, which is now associated with the exchange of nonperturbative QCD gluons [5]. Currently, the Pomeron and Regge pole picture of unpolarized elastic pp scattering is commonly considered as well established in the √ s = 5 GeV-13 TeV c.m. energy range [1], though some new results, e.g. from the TOTEM experiment [6], call for a revision [7]. However, the accuracy of existing polarized high energy experimental data [8][9][10][11] was insufficient to identify a Pomeron contribution, if any, to the pp spin-dependent amplitudes.In this Letter, we report new measurements of the single spin A N (t) and double spin A NN (t) analyzing powers in the small angle elastic collision of RHIC's polarized proton beams with Polarized Atomic Hydrogen Gas Jet Target [15](HJET) at √ s = 13.76 and 21.92 GeV. The precision has been significantly improved compared to previous HJET publications [9,10] and this has allowed us to not only isolate hadronic spin-flip amplitudes but also to incorporate spin dependence in a Regge pole anal-

show abstract

“…Moreover, the CNI analyzing power A N rather weekly depends on the beam momentum. Recently, it has been precisely measured at RHIC in BNL [12][13][14] for various beam momenta, some of which are within and some above the momentum range of interest for SPASCHARM. The A N maximum of ∼ (4-4.5)% is reached at −t 0.003 (GeV/c) 2 , and its average for the interval 0.002 < −t < 0.05 (GeV/c) 2 , weighted with the cross section, can conservatively be estimated at ∼3%.…”

Section: Cni-polarimetrymentioning

confidence: 99%

Polarimeters for the SPASCHARM Experiment

Semenov

Bøgdanov

Bukreeva

et al. 2016

Int. J. Mod. Phys. Conf. Ser.

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A beam channel of polarized protons and antiprotons produced from decays of Λ-and anti-Λ-hyperons for the SPASCHARM experiment is to be built at IHEP U-70 accelerator in Protvino, Russia. The methods for tagging and measuring polarization of the beam (anti)protons are discussed in this report. The fast on-line beam tagging exploits the correlations between polarization and kinematics of (anti)protons originated from (anti)Λ-decays. In the intermediate focus of primary target, decay (anti)protons of different transverse polarizations are spatially dispersed transversely with respect to the beam axis. The tagging system, consisting of fast beam detectors with good spatial resolution, measures the momentum and trajectory of each beam particle, including its position at the intermediate focus, thus allowing instant (on-line) assignment of the transverse polarization value to each (anti)proton. This system is also extremely useful for the beam channel tuning. While being fast and convenient, the polarization tagging fully relies on computing of particle transportation in the beam channel. In order to verify the real beam polarization and operating of the tagging system and beam channel, the independent absolute beam polarimetry is to be used. It is based on measuring the spin asymmetries in elastic scattering of beam (anti)protons in Coulomb-Nuclear Interference (CNI) and diffractive kinematic regions. It is estimated that less than one week of data taking would allow measuring an absolute beam polarization at the statistical accuracy of ∼4-5%.Keywords: Spin; polarization; asymmetry; decays; protons; antiprotons; tagging; elastic scattering.PACS numbers: 13.88.+e, 13.85.Dz This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 3.0 (CC-BY) License. Further distribution of this work is permitted, provided the original work is properly cited.

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Single spin asymmetry AN in polarized proton–proton elastic scattering at s=200 GeV

Cited by 43 publications

References 25 publications

Exclusive diffractive production ofπ⁺π⁻continuum and resonances within tensor pomeron approach

Exclusive diffractive production ofπ⁺π⁻continuum and resonances within tensor pomeron approach

Precision Small Scattering Angle Measurements of Elastic Proton-Proton Single and Double Spin Analyzing Powers at the RHIC Hydrogen Jet Polarimeter

Polarimeters for the SPASCHARM Experiment

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Single spin asymmetry AN in polarized proton–proton elastic scattering at s=200 GeV

Cited by 43 publications

References 25 publications

Exclusive diffractive production ofπ+π−continuum and resonances within tensor pomeron approach

Exclusive diffractive production ofπ+π−continuum and resonances within tensor pomeron approach

Precision Small Scattering Angle Measurements of Elastic Proton-Proton Single and Double Spin Analyzing Powers at the RHIC Hydrogen Jet Polarimeter

Polarimeters for the SPASCHARM Experiment

Contact Info

Product

Resources

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Exclusive diffractive production ofπ⁺π⁻continuum and resonances within tensor pomeron approach

Exclusive diffractive production ofπ⁺π⁻continuum and resonances within tensor pomeron approach