On the physics potential to study the gluon content of proton and deuteron at NICA SPD

Arbuzov, A. B.; Bacchetta, Alessandro; Butenschoen, Mathias; Celiberto, Francesco Giovanni; D’Alesio, U.; Deka, Mridupawan; Denisenko, I.; Echevarría, Miguel G.; Ефремов, А. В.; Ivanov, N. Ya.; Guskov, A.; Karpishkov, Anton; Klopot, Yaroslav; Kniehl, Bernd A.; Kotzinian, A.M.; Kumano, S.; Lansberg, Jean-Philippe; Liu, Keh-Fei; Murgia, F.; Nefedov, Maxim; Parsamyan, B.; Pisano, Cristian; Radici, Marco; Rymbekova, A.; Saleev, V. A.; Shipilova, A. V.; Song, Q. Q.; Teryaev, Oleg

doi:10.1016/j.ppnp.2021.103858

Cited by 82 publications

(49 citation statements)

References 262 publications

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“…Its nominal √ s for 7 TeV proton beams reaches 114.6 GeV. Another possibility is the SPD detector at the NICA facility up to √ s = 27 GeV [100]. We will provide predictions for these 3 setups.…”

Section: A Digression On the η B Detectabilitymentioning

confidence: 99%

Curing the unphysical behaviour of NLO quarkonium production at the LHC and its relevance to constrain the gluon PDF at low scales

Lansberg

Ozcelik

2021

Eur. Phys. J. C

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We address the unphysical energy dependence of quarkonium-hadroproduction cross sections at Next-to-Leading Order (NLO) in $$\alpha _s$$ α s which we attribute to an over-subtraction in the factorisation of the collinear singularities inside the PDFs in the $$\overline{\text {MS}}$$ MS ¯ scheme. Such over- or under-subtractions have a limited phenomenological relevance in most of the scattering processes in particle physics. On the contrary, it is particularly harmful for $$P_T$$ P T -integrated charmonium hadroproduction which renders a wide class of NLO results essentially unusable. Indeed, in such processes, $$\alpha _s$$ α s is not so small, the PDFs are not evolved much and can be rather flat for the corresponding momentum fractions and, finally, some process-dependent NLO pieces are either too small or too large. We propose a scale-fixing criterion which avoids such an over-subtraction. We demonstrate its efficiency for $$\eta _{c,b}$$ η c , b but also for a fictitious light elementary scalar boson. Having provided stable NLO predictions for $$\eta _{c,b}$$ η c , b $$P_T$$ P T -integrated cross sections, $$\sigma ^{\mathrm{NLO}}_{\eta _Q}$$ σ η Q NLO , and discussed the options to study $$\eta _{b}$$ η b hadroproduction, we argue that their measurement at the LHC can help better determine the gluon PDF at low scales and tell whether the local minimum in conventional NLO gluon PDFs around $$x=0.001$$ x = 0.001 at scales below 2 GeV is physical or not.

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Section: A Digression On the η B Detectabilitymentioning

confidence: 99%

Curing the unphysical behaviour of NLO quarkonium production at the LHC and its relevance to constrain the gluon PDF at low scales

Lansberg

Ozcelik

2021

Eur. Phys. J. C

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“…On the collinear structure function b 1 of the spin-1 deuteron, there was a measurement by the HERMES collaboration in 2005 [1]. In future, there are experimental projects to investigate structure functions of spin-1 hadrons, especially the spin-1 deuteron, at the Jefferson laboratory (JLab) [2], Fermilab [3], and Nuclotron-based Ion Collider fAcility (NICA) [4], and electron-ion colliders in US and China. We also have been investigating structure functions of spin-1 hadrons theoretically by considering these experimental projects [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Transverse-momentum-dependent parton distribution functions up to twist 4 for spin-1 hadrons

Kumano

Song²

2021

Phys. Rev. D

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We show transverse-momentum-dependent parton distribution functions (TMDs) for spin-1 hadrons including twist-3 and 4 functions by taking the decomposition of a quark correlation function in the Lorentz-invariant way with the conditions of Hermiticity and parity invariance. We found 30 new TMDs in the tensor-polarized spin-1 hadron at twists 3 and 4 in addition to 10 TMDs at twist 2. Since time-reversal-odd terms of the collinear correlation function should vanish after integrals over the partonic transverse momentum, we obtained new sum rules for the time-reversal-odd structure functions, d 2 k T g LT = d 2 k T h LL = d 2 k T h 3LL = 0, at twists 3 and 4. We also indicated that transverse-momentum-dependent fragmentation functions exist in tensor-polarized spin-1 hadrons. The TMDs can probe color degrees of freedom, so that they are valuable in providing unique opportunities for creating interdisciplinary physics fields such as gluon condensate, color Aharonov-Bohm effect, and color entanglement. We also found three new collinear PDFs at twists 3 and 4, and a twist-2 relation and a sum rule were derived in analogy to the Wandzura-Wilczek relation and the Burkhardt-Cottingham sum rule on the structure function g 2 .

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“…It could be realized as a Fermilab-SpinQuest experiment [19] when a polarized-deuteron target becomes ready [20]. In addition, since the Nuclotronbased Ion Collider fAcility (NICA) will have a polarized-deuteron beam, the tensorpolarized structure functions and the gluon transversity will be investigated, for example, by observing J/ψ production [21,22]. These structure functions are interesting for investigating especially exotic aspects of hadron physics, such as hidden color [23] and non-nucleonic component [24] in the deuteron.…”

Section: Jhep09(2021)141mentioning

confidence: 99%

“…However, we believe that bright future is ahead of us in the sense that the tensor-polarized structure function b 1 and the gluon transversity, which are specific observables in the spin-1 hadrons, will be measured at JLab in the middle of 2020's [7,9,10] and such experiments will be proposed at Fermilab [19] as the proton-deuteron Drell-Yan process. The NICA facility will have the polarized-deuteron beam in the near future [21,22], so that they could focus their studies on the structure functions of the spin-1 deuteron. In addition, there are EIC projects in US and China [12,13] to investigate the structure functions of the spin-1 hadrons and nuclei in 2030's.…”

Section: Jhep09(2021)141mentioning

confidence: 99%

Twist-2 relation and sum rule for tensor-polarized parton distribution functions of spin-1 hadrons

Kumano

Song

2021

J. High Energ. Phys.

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Sum rules for structure functions and their twist-2 relations have important roles in constraining their magnitudes and x dependencies and in studying higher-twist effects. The Wandzura-Wilczek (WW) relation and the Burkhardt-Cottingham (BC) sum rule are such examples for the polarized structure functions g1 and g2. Recently, new twist-3 and twist-4 parton distribution functions were proposed for spin-1 hadrons, so that it became possible to investigate spin-1 structure functions including higher-twist ones. We show in this work that an analogous twist-2 relation and a sum rule exist for the tensor-polarized parton distribution functions f1LL and fLT, where f1LL is a twist-2 function and fLT is a twist-3 one. Namely, the twist-2 part of fLT is expressed by an integral of f1LL (or b1) and the integral of the function f2LT = (2/3)fLT− f1LL over x vanishes. If the parton-model sum rule for f1LL (b1) is applied by assuming vanishing tensor-polarized antiquark distributions, another sum rule also exists for fLT itself. These relations should be valuable for studying tensor-polarized distribution functions of spin-1 hadrons and for separating twist-2 components from higher-twist terms, as the WW relation and BC sum rule have been used for investigating x dependence and higher-twist effects in g2. In deriving these relations, we indicate that four twist-3 multiparton distribution functions FLT, GLT, $$ {H}_{LL}^{\perp } $$ H LL ⊥ , and HTT exist for tensor-polarized spin-1 hadrons. These multiparton distribution functions are also interesting to probe multiparton correlations in spin-1 hadrons. In the near future, we expect that physics of spin-1 hadrons will become a popular topic, since there are experimental projects to investigate spin structure of the spin-1 deuteron at the Jefferson Laboratory, the Fermilab, the nuclotron-based ion collider facility, the electron-ion colliders in US and China in 2020’s and 2030’s.

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On the physics potential to study the gluon content of proton and deuteron at NICA SPD

Cited by 82 publications

References 262 publications

Curing the unphysical behaviour of NLO quarkonium production at the LHC and its relevance to constrain the gluon PDF at low scales

Curing the unphysical behaviour of NLO quarkonium production at the LHC and its relevance to constrain the gluon PDF at low scales

Transverse-momentum-dependent parton distribution functions up to twist 4 for spin-1 hadrons

Twist-2 relation and sum rule for tensor-polarized parton distribution functions of spin-1 hadrons

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