Production Dynamics of High-Mass Muon Pairs

Antreasyan, D.; Atwood, W. B.; 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.; Fujisaki, M.; Hodous, M.F.; Lagerlund, Terrence D.; 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.; Reibel, K.; Rinzivillo, R.; Sanguinetti, G.; Schulz, I.; Sciacca, G.; Спиллантини, П.; 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.47.12

Cited by 50 publications

(20 citation statements)

References 16 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.…”

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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“…The data that we have studied in this work come from the following experiments: E288 [11], E605 [12], R209 [13], CDF Run I [14], D0 Run I [15,16], CDF Run II [17], D0 Run II [18]. These data cover a large interval in center of mass energies, dilepton invariant masses and rapidities.…”

Section: Jhep11(2014)098mentioning

confidence: 99%

“…Total and partial χ 2 /points of our global fit on low-energy [11,13] and Tevatron data [14][15][16][17][18] Table 7. Results of our global fit on low-energy [11,13] and Tevatron data [14][15][16][17][18], with D NP = 0 (eq. (2.35)), Q i = Q 0 + q T , at NNLL and NNL accuracies and with the collinear parton distributions from MSTW08 [31] at NNLO and NLO.…”

Section: Jhep11(2014)098mentioning

confidence: 99%

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Non-perturbative QCD effects in q T spectra of Drell-Yan and Z-boson production

D’Alesio

Echevarría

Melis

et al. 2014

J. High Energ. Phys.

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Abstract:The factorization theorems for transverse momentum distributions of dilepton/boson production, recently formulated by Collins and Echevarria-Idilbi-Scimemi in terms of well-defined transverse momentum dependent distributions (TMDs), allows for a systematic and quantitative analysis of non-perturbative QCD effects of the cross sections involving these quantities. In this paper we perform a global fit using all current available data for Drell-Yan and Z-boson production at hadron colliders within this framework. The perturbative calculable pieces of our estimates are included using a complete resummation at next-to-next-to-leading-logarithmic accuracy. Performing the matching of transverse momentum distributions onto the standard collinear parton distribution functions and recalling that the corresponding matching coefficient can be partially exponentiated, we find that this exponentiated part is spin-independent and resummable. We argue that the inclusion of higher order perturbative pieces is necessary when data from lower energy scales are analyzed. We consider non-perturbative corrections both to the intrinsic nucleon structure and to the evolution kernel and find that the non-perturbative part of the TMDs could be parametrized in terms of a minimal set of parameters (namely 2-3). When all corrections are included the global fit so performed gives a χ 2 /d.o.f. 1 and a very precise prediction for vector boson production at the Large Hadron Collider (LHC).

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“…The parameters g i are fitted from the nucleon-nucleon Drell-Yan process data [63][64][65][66][67][68][69] at the initial scale of Q 2 0 = 2.4 GeV 2 yielding g 1 = 0.212, g 2 = 0.84, g 3 = 0. Since the nonperturbative form factor S NP for quarks from the one proton and antiquarks from another proton satisfies [70]…”

Section: The Tmd Evolution Of Distribution Functionsmentioning

confidence: 99%

sin(2ϕ−ϕS) azimuthal asymmetry in the pion induced Drell-Yan process within TMD factorization

Wang

Lü

2020

Phys. Rev. D

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We investigate the single transverse-spin asymmetry with a sin(2φ − φS) modulation in the pioninduced Drell-Yan process within the theoretical framework of the transverse momentum dependent factorization. The asymmetry is contributed by the convolution of the Boer-Mulders function and the transversity. We adopt the model results for the distributions of the pion meson from the light-cone wavefunction approach and the available parametrization for the distributions of the proton to numerically estimate the sin(2φ − φS) asymmetry in π − p Drell-Yan at the kinematics of the COMPASS at CERN. To implement the TMD evolution formalism of parton distribution functions, we apply the recently extracted nonperturbative Sudakov form factor associated with the distribution functions of the proton and the pion. It is found that our prediction on the single transverse-spin dependent asymmetry sin(2φ − φS) as functions of xp, xπ, xF and q ⊥ is qualitatively consistent with the recent COMPASS measurement in both sign and magnitude. I. INTRODUCTIONThe Boer-Mulders function, denoted by h ⊥ 1 , is one of the eight transverse momentum dependent (TMD) parton distribution functions (PDFs) describing the partonic structure of hadrons at leading-twist level. It represents the transversely polarization asymmetry of quarks inside an unpolarized hadron [1,2] arising from the correlation between the quark spin and the quark transverse momentum, thereby it manifests the novel structure of hadrons. However, the very existence of the Boer-Mulders function was not so obvious. Similar to its chiral-even partner-the Sivers function f ⊥ 1T [3], the Boer-Mulder function was initially thought to vanish under the constraint of (naive) time reversal invariance of QCD [4]. The situation was changed after explicit model calculations [5][6][7] incorporating gluon exchange between the struck quark and the spectator shows that the T-odd distributions can actually survive. The crucial ingredient in the argument is the Wilson lines (or the gauge links) appearing in the full gange-invariant definition of TMDs [8,9]. The presence of the Wilson lines also indicates that the T-odd distributions, such as Sivers function and the Boer-Mulders function are process dependent, i.e., they change sign [6][7][8] between the semi-inclusive deeply inelastic scattering and Drell-Yan process, a vital prediction which needs verification by future experimental measurement. In the last decades, the Boer-Mulders function of the proton as well as that of the pion has been studied intensively in literature [7, by models and phenomenological analysis.As the Boer-Mulders function is a chiral-odd distribution function, it has to be coupled with another chirlal-odd distribution/fragmentation function to survive in a high energy scattering process. A promising process for accessing the Boer-Mulders function is the unpolarized Drell-Yan process, which displays an azimuthal dependence of the finalstate dilepton with the cos 2φ modulation. As proposed by Boer [2], the coupling of two Boer-...

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Production Dynamics of High-Mass Muon Pairs

Cited by 50 publications

References 16 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

Non-perturbative QCD effects in q T spectra of Drell-Yan and Z-boson production

sin(2ϕ−ϕS) azimuthal asymmetry in the pion induced Drell-Yan process within TMD factorization

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