First measurement of the |t|-dependence of coherent J/ψ photonuclear production

Acharya, S.; Adamová, D.; Adler, A.; Adolfsson, J.; Rinella, G. Aglieri; Agnello, M.; Agrawal, Neelima; Ahammed, Z.; Ahmad, Shakeel; Ahn, S. U.; Akbar, Zaenal; Akindinov, A.; Al-Turany, M.; Albuquerque, D. S. D.; Aleksandrov, D.; Alessandro, B.; Alfanda, Haidar Mas'Ud; Molina, R. Alfaro; Ali, B.; Ali, Y.; Alici, A.; Alizadehvandchali, Negin; Alkin, A.; Alme, J.; Alt, T.; Altenkamper, L.; Altsybeev, I.; Anaam, Mustafa; Andrei, C.; Andreou, D.; Andronic, A.; Anguelov, V.; Antičić, T.; Antinori, F.; Antonioli, P.; Anuj, C.; Apadula, N.; Aphecetche, L.; Appelshäuser, H.; Arcelli, S.; Arnaldi, R.; Arratia, M.; Arsene, Ionut Cristian; Arslandok, M.; Augustinus, A.; Averbeck, R.; Aziz, S.; Azmi, M. D.; Badalà, A.; Baek, Yongwook; Bai, Xiaozhi; Bailhache, R.; Bala, R.; Balbino, Alessandro; Baldisseri, A.; Ball, M.; Banerjee, Debjani; Barbera, R.; Barioglio, L.; Barlou, Maria; Barnaföldi, G. G.; Barnby, Lee Stuart; Barret, V.; Bartels, Clara; Barth, K.; Bartsch, E.; Baruffaldi, F.; Bastid, N.; Basu, S.; Batigne, G.; Batyunya, B.; Bauri, D.; Alba, J. L. Bazo; Bearden, I. G.; Beattie, Caitlin; Belikov, I.; Hechavarria, A. D. C. Bell; Bellini, F.; Bellwied, R.; Belokurova, Svetlana; Belyaev, V.; Bencédi, G.; Beolè, S.; Bercuci, A.; Berdnikov, Y.; Berdnikova, Anastasia; Berényi, D.; Bergmann, Luisa; Besoiu, Mihaela Gabriela; Betev, L.; Bhaduri, Partha Pratim; Bhasin, A.; Bhat, I. R.; Bhat, Mohammad Asif; Bhattacharjee, B.; Bhattacharya, Purba; Bianchi, A.; Bianchi, L.; Bianchi, N.; Bielčík, J.; Bielčíková, J.; Bilandzic, A.; Bíró, G.; Biswas, S.; Blair, J. T.; Blau, D.; Blidaru, Mihail Bogdan; Blume, C.; Boca, G.; Bock, F.; Bogdanov, A.; Boi, S.; Bok, Jeongsu; Boldizsár, L.; Bolozdynya, A.; Bombara, M.; Bond, Peter Matthew; Bonomi, G.; Borel, H.; Borissov, A.; Bossi, Hannah; Botta, E.; Bratrud, L.; Braun‐Munzinger, P.; Bregant, M.; Broz, M.; Bruno, G.; Buckland, Matthew Daniel; Budnikov, D.; Buesching, H.; Bufalino, S.; Bugnon, Ophelie; Bühler, P.; Bunčić, P.; Buthelezi, Z.; Butt, J.; Bysiak, Sebastian Adam; Cai, Mengke; Caffarri, D.; Caliva, A.; Villar, E. Calvo; Camacho, Juan Manuel Mejia; Camacho, R.S.; Camerini, P.; Canedo, Fabio de Moraes; Capon, A. A.; Carnesecchi, F.; Caron, Robin Albert Andre; Castellanos, J. Castillo; Casula, Ester Anna Rita; Catalano, F.; Sànchez, C. Ceballos; Chakraborty, Purnendu; Chandra, S.; Chang, W.; Chapeland, S.; Chartier, M.; Chattopadhyay, S.; Chauvin, A.; Chavez, Tonatiuh Garcia; Cheshkov, C.; Cheynis, B.; Barroso, V. Chibante; Chinellato, D. D.; Cho, S.; Chochula, P.; Christakoglou, P.; Christensen, Christian Holm; Christiansen, P.; Chujo, T.; Cicalò, C.; Cifarelli, L.; Cindolo, F.; Ciupek, Michael Rudolf; Clai, G.; Cleymans, J.; Colamaria, F.; Colburn, Jonathan Samuel; Colella, D.; Collu, A.; Colocci, M.; Concas, M.; Balbastre, G. Conesa; Valle, Z. Conesa del; Contin, G.; Contreras, J. G.; Cormier, Thomas Michael; Cortese, P.; Cosentino, M. R.; Costa, F.; Costanza, S.; Crochet, P.; Cuautle, E.; Cui, Pengyao; Cunqueiro, L.; Dainese, A.; Damas, F. P. A.; Danisch, M.C.; Danu, A.; Das, I.; Das, P.; Das, S.; Dash, S.; De, S.; De, A.; Cataldo, G De; Cilladi, Lorenzo de; Cuveland, J. de; Falco, A. De; Gruttola, D. De; Marco, N. De; Martin, Chiara de; Pasquale, S. De; Deb, Suman; Degenhardt, H. F.; Deja, Kamil Rafał; Stritto, Luigi Dello; Delsanto, S.; Deng, Weijun; Dhankher, P.; Bari, D. Di; Mauro, A. Di; Díaz, Raúl Arteche; Dietel, T.; Ding, Y.; Divià, R.; Dixit, Dhruv Utpalkumar; Djuvsland, Oeystein; Dmitrieva, Uliana; Do, Jaehyeon; Dobrin, A.; Dönigus, B.; Dordic, O.; Dubey, A. K.; Dubla, A.; Dudi, S.; Mallick, Dukhishyam; Dupieux, P.; Eder, Tabea Maria; Ehlers, R. J.; Eikeland, Viljar Nilsen; Elia, D.; Erazmus, B.; Ercolessi, Francesca; Erhardt, F.; Erokhin, A.; Ersdal, Magnus Rentsch; Espagnon, B.; Eulisse, G.; Evans, D.; Evdokimov, S.; Fabbietti, L.; Faggin, M.; Faivre, J.; Fan, F.; Fantoni, A.; Fasel, M.; Fecchio, P.; Feliciello, A.; Feofilov, G.; Téllez, A. Fernández; Ferrero, A.; Ferretti, A.; Festanti, A.; Feuillard, Victor Jose Gaston; Figiel, J.; Filchagin, S.; Finogeev, D.; Fionda, F. M.; Fiorenza, G.; Flor, F.; Flores, Amanda Nicole; Foertsch, S.; Foka, P.; Fokin, S.; Fragiacomo, E.; Fuchs, U.; Funicello, Nicola; Furget, C.; Furs, A.; Girard, M. Fusco; Gaardhøje, J. J.; Gagliardi, M.; Gago, A. M.; Gal, A.; Galvan, Carlos Duarte; Ganoti, P.; Garabatos, C.; Garcia, Jesus Ricardo Alvarado; García-Solis, E.; Garg, K.; Gargiulo, C.; Garibli, Aydan; Garner, K.; Gasik, P.; Gauger, Erin Frances; Ducati, M. B. Gay; Germain, M.; Ghosh, J.; Ghosh, P.; Ghosh, Shamik; Giacalone, Marco; Gianotti, P.; Giubellino, P.; Giubilato, P.; Glaenzer, Aude Marie Camille; Glässel, P.; González, V.; González-Trueba, L. H.; Gorbunov, S.; Görlich, L.; Gotovac, S.; Grabski, V.; Graczykowski, L. K.; Graham, K. L.; Greiner, L.; Grelli, A.; Grigoras, C.; Grigoriev, V.; Grigoryan, A.; Grigoryan, S.; Groettvik, Ola Slettevoll; Grosa, F.; Grosse-Oetringhaus, J. F.; Grosso, R.; Guernane, R.; Guilbaud, M.; Guittiere, M.; Gulbrandsen, K.; Gunji, T.; Gupta, A.; Gupta, R.; Guzman, I. B.; Haake, R.; Habib, Michael Karim; Hadjidakis, C.; Hamagaki, H.; Hamar, G.; Hamid, M.; Hannigan, R.; Haque, M. R.; Harlenderova, A.; Harris, J. 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doi:10.1016/j.physletb.2021.136280

Cited by 52 publications

(46 citation statements)

References 39 publications

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“…From further measurements and theoretical developments, coherent photonuclear production was suggested as the underlying physics mechanism [34,35]. Prompt / measurement in peripheral Pb-Pb collisions from LHCb [36] strongly supported this hypothesis as the measured mean T , constrained by the size of the nucleus target, is consistent with that expected for an Pb nucleus in UPC [37]. Since the coherent photo-production of / is produced by a two gluon exchange at LO in QCD, coherent photoproduction in inelastic Pb-Pb collisions, will be a…”

Section: Pos(lhcp2021)054mentioning

confidence: 76%

New measurements in the quarkonium sector with focus on new discriminatory observables

Kim¹,

Alice²,

Collaborations³

2021

Proceedings of the Ninth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2021)

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Section: Pos(lhcp2021)054mentioning

confidence: 76%

New measurements in the quarkonium sector with focus on new discriminatory observables

Kim¹,

Alice²,

Collaborations³

2021

Proceedings of the Ninth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2021)

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“…One of the consequences of saturation is a steeper t-distribution compared to one obtained from the form factor or Fourier transform of the density profile [75]. This has recently received some attention [76] in light of the very precise ALICE measurements of J/ψ photo-production at very low t [77] as shown in Figure 17. Note that even after saturation is included as in the model in [78], the spectrum is not steep enough to reproduce the lowest t bin.…”

Section: Diffractive Reactionsmentioning

confidence: 99%

“…[75], leading twist approach (LTA) [79], and b-BK saturation model [78]. Figure from the work in [77].…”

Section: Diffractive Reactionsmentioning

confidence: 99%

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Mining for Gluon Saturation at Colliders

Morreale

Salazar

2021

Universe

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Quantum chromodynamics (QCD) is the theory of strong interactions of quarks and gluons collectively called partons, the basic constituents of all nuclear matter. Its non-abelian character manifests in nature in the form of two remarkable properties: color confinement and asymptotic freedom. At high energies, perturbation theory can result in the growth and dominance of very gluon densities at small-x. If left uncontrolled, this growth can result in gluons eternally growing violating a number of mathematical bounds. The resolution to this problem lies by balancing gluon emissions by recombinating gluons at high energies: phenomena of gluon saturation. High energy nuclear and particle physics experiments have spent the past decades quantifying the structure of protons and nuclei in terms of their fundamental constituents confirming predicted extraordinary behavior of matter at extreme density and pressure conditions. In the process they have also measured seemingly unexpected phenomena. We will give a state of the art review of the underlying theoretical and experimental tools and measurements pertinent to gluon saturation physics. We will argue for the need of high energy electron-proton/ion colliders such as the proposed EIC (USA) and LHeC (Europe) to consolidate our knowledge of QCD knowledge in the small x kinematic domains.

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“…1, where a 5% resolution effect was included in generating the |t| distributions. Similarly, at the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron Collider (LHC), the effort of measuring the gluon density distributions of heavy nuclei has already begun using photoproduction of ρ 0 and J/ψ mesons in ultra-peripheral collisions (UPCs) [16][17][18][19][20][21][22][23]. These measurements are very similar to the proposed measurement at the EIC, except that the photon virtuality is close to zero in UPCs and one has less control on the event-by-event kinematics.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the background in coherent $J/ψ$ production at the EIC

Chang,

Aschenauer,

Baker

et al. 2021

Preprint

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Understanding various fundamental properties of nucleons and nuclei are among the most important scientific goals at the upcoming Electron-Ion Collider (EIC). With the unprecedented opportunity provided by the next-generation machine, the EIC might provide definitive answers to many standing puzzles and open questions in modern nuclear physics. Here we investigate one of the golden measurements proposed at the EIC, which is to obtain the spatial gluon density distribution within a lead (P b) nucleus. The proposed experimental process is the exclusive J/ψ vector-meson production off the P b nucleus -e+P b → e +J/ψ+P b . The Fourier transformation of the momentum transfer |t| distribution of the coherent diffraction is the transverse gluon spatial distribution. In order to measure it, the experiment has to overcome an overwhelmingly large background arising from the incoherent diffractive production, where the nucleus P b mostly breaks up into fragments of particles in the far-forward direction close to the hadron-going beam rapidity. In this paper, we systematically study the rejection of incoherent J/ψ production by vetoing products from these nuclear breakups -protons, neutrons, and photons, which is based on the BeAGLE event generator and the most up-to-date EIC Far-forward Interaction Region design. The achieved vetoing efficiency, the ratio between the number of vetoed events and total incoherent events, ranges from about 80% -99% depending on |t|, which can resolve at least the first minimum of the coherent diffractive distribution based on the Sartre model. Experimental and accelerator machine challenges as well as potential improvements are discussed.

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First measurement of the |t|-dependence of coherent J/ψ photonuclear production

Cited by 52 publications

References 39 publications

New measurements in the quarkonium sector with focus on new discriminatory observables

New measurements in the quarkonium sector with focus on new discriminatory observables

Mining for Gluon Saturation at Colliders

Investigation of the background in coherent $J/ψ$ production at the EIC

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