Dimuon Scaling Comparison at 44 and 62 GeV

Antreasyan, D.; Becker, U.; Bellettini, G.; Braccini, P. L.; Branson, J. G.; Burger, J. D.; Carbonara, F.; Carrara, R.; Castaldi, R.; Cavasinni, V.; Cervelli, F.; Chen, M.; Chiefari, G.; Prete, T. Del; Drago, E.; Field, R. D.; Fujisaki, M.; Hodous, M.F.; Laurelli, P.; Leistam, O.; Luckey, D.; Massai, M.M.; Matsuda, T.; Merola, L.; Morganti, M.; Napolitano, M.; Newman, H. B.; Novikoff, D.; Paradiso, Joseph A.; Perasso, L.; Rinzivillo, R.; Sanguinetti, G.; Schulz, I.; Sciacca, G.; Steuer, M.; Strauch, K.; Sugimoto, S.; Ting, Samuel C.C.; Toki, W. H.; Valdata‐Nappi, M.; Vannini, C.; Vannucci, F.; Visco, Fran

doi:10.1103/physrevlett.48.302

Cited by 56 publications

(36 citation statements)

References 13 publications

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“…The R209 experiment [45,46] (two proton beams colliding at a center-of-mass energy of √ s = 62 GeV) was carried out at the CERN ISR (Intersecting Storage Rings) to search for new particles and test scaling models. The differential cross section dσ/dq 2 T for the production of a muon pair with transverse-momentum q T is reported in [47] for the invariant mass range 5 GeV < Q < 8 GeV. The low transverse momentum part of these data has been included in extractions of TMDs [7,9].…”

Section: R209mentioning

confidence: 99%

Difficulties in the description of Drell-Yan processes at moderate invariant mass and high transverse momentum

et al. 2019

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We study the Drell-Yan cross section differential with respect to the transverse momentum of the produced lepton pair. We consider data with moderate invariant mass Q of the lepton pair, between 4.5 GeV and 13.5 GeV, and similar (although slightly smaller) values of the transverse momentum qT . We approach the problem by deriving predictions based on standard collinear factorization, which are expected to be valid toward the high-qT end of the spectrum and to which any description of the spectrum at lower qT using transverse-momentum dependent parton distributions ultimately needs to be matched. We find that the collinear framework predicts cross sections that in most cases are significantly below available data at high qT . We discuss additional perturbative and possible non-perturbative effects that increase the predicted cross section, but not by a sufficient amount. PACS numbers: 12.38.Bx, 12.39.St, 13.85.Qk I. INTRODUCTIONThe Drell-Yan (DY) process [1] is one of the main sources of information about the internal structure of the nucleon (for a recent review, see [2]). Factorization theorems were first established for DY [3], and global extractions of parton distribution functions (PDFs) heavily rely on measurements of the DY cross section differential in the rapidity of the produced boson (see, e.g., [4,5] and references therein). DY processes also offer the possibility to access transverse momentum distributions (TMDs) [6][7][8][9][10][11][12][13][14][15], if the cross section is kept differential in the transverse momentum of the produced boson.Considering the invariant mass of the produced boson, Q, its transverse momentum, q T , and a typical QCD scale, Λ QCD , we can distinguish a region of "high transverse momentum" 1 where Λ QCD q T ∼ Q and a region of "low transverse momentum" where q T Q. In the first region, the cross section should be well described by a collinear factorization framework in terms of collinear PDFs convoluted with a partonic hard scattering calculated up to a fixed order in α s . This calculation is nowadays possible even up to order α 3 s (NNLO) [17], but most of the phenomenology is carried out at order α 2 s (NLO) [18][19][20][21][22][23][24][25] or even only order α s (LO). In the low transverse momentum region, the cross section should be described in the framework of TMD factorization, which also incorporates the effects of the resummation of large logarithms in q T /Q. The all-order corrections dominating the cross section in this region are embodied in the so-called "W term" of the Collins-Soper-Sterman formalism [26]. The matching of the collinear formalism at high-q T with the TMD resummation at low-q T is usually performed through the introduction of the so-called "Y term", i.e., the difference of the fixed-order perturbative result and the asymptotic expansion of the resummed result. In the low-q T region, the asymptotic piece and the fixed-order one ideally cancel each other, leaving only the W term. In the high-q T region, on the other hand, the cancellation takes pla...

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Section: R209mentioning

confidence: 99%

Difficulties in the description of Drell-Yan processes at moderate invariant mass and high transverse momentum

et al. 2019

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“…since the observed q T distribution at low Q was approximately gaussian in shape. Using the Duke and Owens parton distribution functions [24], DWS determined parameters g 1 and g 2 from E288 [25] data with √ S = 27.4 GeV, and also from R209 [26] data. The resulting values (with a particular choice of Q 0 = 2 GeV) were…”

Section: Determination Of F N Pmentioning

confidence: 99%

“…where τ 0 is arbitrary parameter. 4 Choosing τ 0 = 0.01, Q 0 = 1.6 GeV, and b lim = 0.5 GeV −1 , these authors determined the non-perturbative parameters by comparison of theory to R209 data [26] in the range 5 GeV < Q < 8 GeV, to √ S = 27.4 GeV E288…”

Section: Determination Of F N Pmentioning

confidence: 99%

Vector boson production in hadronic collisions

1997

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We consider the production of γ * , W and Z vector bosons in hadron-hadron collisions in perturbative QCD. We present results from a new numerical program which gives a full description of the production of the vector bosons and of their decay products. At small q T the calculation includes resummation of large logarithms and non-perturbative effects. The resummation is matched with the full O(α S ) calculation. In addition, the program correctly reproduces the known O(α S ) cross section when integrated over q T . Besides presenting results for W and Z production at the Tevatron, we also review constraints on the non-perturbative functions using fixed target data on lepton pair production, and make several observations on this topic.

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“…Despite these facts, many theoretical and phenomenological analyses of the DY process were made [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. The theoretical improvement was accompanied by many experimental results from fixed-target [32][33][34][35] and collider [36][37][38][39][40] experiments.…”

Section: Introductionmentioning

confidence: 99%

Drell-Yan plus jet production and BFKL evolution

Golec-Biernat¹,

Motyka²,

Stebel³

2019

Proceedings of XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2019)

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We discuss the Drell-Yan dilepton production using the transverse momentum dependent parton distributions evolved with the Catani-Ciafaloni-Fiorani-Marchesini-Kwieciński (CCFM-K) equations in the single loop approximation. Such equations are obtained assuming angular ordering of emitted partons (coherence) for x ∼ 1 and transverse momentum ordering for x 1. This evolution scheme also contains the Collins-Soper-Sterman (CSS) soft gluon resummation. We make a comparison with a broad class of data on transverse momentum spectra of low mass Drell-Yan dileptons. 1

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Dimuon Scaling Comparison at 44 and 62 GeV

Cited by 56 publications

References 13 publications

Difficulties in the description of Drell-Yan processes at moderate invariant mass and high transverse momentum

Difficulties in the description of Drell-Yan processes at moderate invariant mass and high transverse momentum

Vector boson production in hadronic collisions

Drell-Yan plus jet production and BFKL evolution

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