Limits on the effective quark radius from inclusive ep scattering at HERA

Abramowicz, H.; Abt, I.; Adamczyk, L.; Adamus, M.; Antonelli, S.; Aushev, V.; Behnke, O.; Behrens, U.; Bertolin, A.; Bhadra, S.; Bloch, I.; Boos, E.G.; Brock, I.; Brook, N. H.; Brugnera, R.; Bruni, A.; Bussey, P.; Caldwell, A.; Capua, M.; Catterall, C. D.; Chwastowski, J. J.; Ciborowski, J.; Ciesielski, R.; Cooper-Sarkar, A. M.; Corradi, M.; Dementiev, R. K.; Devenish, R. C. E.; Dusini, S.; Foster, B.; Gach, G. P.; Gallo, E.; Garfagnini, A.; Geiser, A.; Gizhko, A.; Gladilin, L. K.; Golubkov, Yu. A.; Grzelak, G.; Guzik, M. P.; Gwenlan, C.; Hain, W.; Hlushchenko, O.; Hochman, D.; Hori, R.; Ibrahim, Z. A.; Iga, Y.; Ishitsuka, M.; Januschek, F.; Jomhari, N. Z.; Каденко, І.; Kananov, S.; Karshon, U.; Kaur, P.; Kisielewska, D.; Klanner, R.; Klein, U.; Korzhavina, I. A.; Kotański, A.; Kötz, U.; Kovalchuk, N.; Kowalski, H.; Krupa, B.; Kuprash, O.; Kuze, M.; Levchenko, B. B.; Levy, A.; Limentani, S.; Lisovyi, M.; Lobodzinska, E.; Löhr, B.; Lohrmann, E.; Longhin, A.; Lontkovskyi, D.; Lukina, Olga; Makarenko, I.; Malka, J.; Mastroberardino, A.; Idris, F. Mohamad; Nasir, N. Mohammad; Myronenko, V.; Nagano, K.; Nobe, T.; Nowak, R. J.; Onishchuk, Y.; Paul, E.; Perlański, W.; Pokrovskiy, N. S.; Polini, A.; Przybycień, M.; Roloff, Philipp; Ruspa, M.; Saxon, D. H.; Schioppa, M.; Schneekloth, U.; Schörner-Sadenius, T.; Shcheglova, L.M.; Shevchenko, R.; Shkola, O.; Shyrma, Yu.O.; Singh, Inderpal; Skillicorn, I. O.; Słomiński, W.; Solano, A.; Stančo, L.; Stefaniuk, N.; Stern, A.; Stopa, P.; Sukhonos, D.; Sztuk-Dambietz, J.; Tassi, E.; Tokushuku, K.; Tomaszewska, J.; Tsurugai, T.; Turcato, M.; Turkot, O.; Tymieniecka, T.; Verbytskyi, A.; Abdullah, Wan Ahmad Tajuddin Wan; Wichmann, K.; Wing, M.; Yamada, S.; Yamazaki, Y.; Zakharchuk, N.; Żarnecki, A. F.; Zawiejski, L.; Zenaiev, O.; Zhautykov, B.O.; Zotkin, D.S.

doi:10.1016/j.physletb.2016.04.007

Cited by 16 publications

(18 citation statements)

References 10 publications

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“…The extracted limit on R q is R q ≤ 1 × 10 −19 m, which can be compared with the 95 % Confidence Level limit extracted from HERA data [33], R q < 4 × 10 −19 m. The limit extracted from the HERA data was the result of a much fuller analysis; it is expected that the limits from VHEeP would become considerably stronger if lower Q 2 data were included in the analysis, but this would require a much more complete analysis using detailed information on systematic uncertainties. The limit would also improve by about a factor 3 for a factor 10 increase in luminosity.…”

Section: W (Gev)mentioning

confidence: 87%

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VHEeP: a very high energy electron–proton collider

Caldwell¹,

Wing²

2016

Eur. Phys. J. C

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Based on current CERN infrastructure, an electron-proton collider is proposed at a centre-of-mass energy of about 9 TeV. A 7 TeV LHC bunch is used as the proton driver to create a plasma wakefield which then accelerates electrons to 3 TeV, these then colliding with the other 7 TeV LHC proton beam. Although of very high energy, the collider has a modest projected integrated luminosity of 10-100 pb −1 . For such a collider, with a centre-of-mass energy 30 times greater than HERA, parton momentum fractions, x, down to about 10 −8 are accessible for photon virtualities, Q 2 , of 1 GeV 2 . The energy dependence of hadronic cross sections at high energies, such as the total photon-proton cross section, which has synergy with cosmic-ray physics, can be measured and QCD and the structure of matter better understood in a region where the effects are completely unknown. Searches at high Q 2 for physics beyond the Standard Model will be possible, in particular the significantly increased sensitivity to the production of leptoquarks. These and other physics highlights of a very high energy electronproton collider are outlined.

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Section: W (Gev)mentioning

confidence: 87%

“…where R 2 e and R 2 q are the mean-square radii of the electron and quark radius, respectively. As has been done in a recent analysis of HERA data [33], the radius of the electron is assumed to be zero, i.e. the electron is point-like.…”

Section: Quark Substructurementioning

confidence: 99%

VHEeP: a very high energy electron–proton collider

Caldwell¹,

Wing²

2016

Eur. Phys. J. C

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“…The ultimate goal is to encourage potential collaborators to perform new analysis and continue to deliver valuable physics results. 6 http://inspirehep.net 7 http://www-zeus.desy.de, http://wwwzeus.mpp.mpg.de…”

Section: Discussionmentioning

confidence: 99%

The ZEUS ong term data preservation project

Verbytskyi¹

2016

Proceedings of XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2016)

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The ZEUS data preservation (ZEUS DP) project assures continued access to the data and documentation related to the experiment. It aims to provide the ability to continue the generation of valuable scientific results from these data in the future. This talk presents analysis opportunities within the ZEUS DP project and its benefits for the physics community. The implications of the preserved data are discussed in the context of current data analyses, verification of contemporary and future theoretical models and the planning of future experiments and analyses. The detailed documentation on the data preservation effort can serve as an example for the data preservation efforts in current and future experiments. XXIV International Workshop on Deep-Inelastic Scattering and RelatedSubjects 11-15 April, 2016 DESY Hamburg, Germany * Speaker. † On behalf of the ZEUS collaboration © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). http://pos.sissa.it/ The ZEUS long term data preservation project Andrii Verbytskyi 1 PAW files with an identical information were created as well 2 http://www.desy.de, Deutsches Elektronen Synchrotron, Notkestr. 85, Hamburg DE-22607 3 http://www.mpcdf.mpg.de, Max-Planck Computing and Data Facility, Gießenbachstr. 2, Garching DE-85748 4 http://naf.desy.de/, National Analysis Facility 5

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“…The limits on the BSM contributions were derived in a frequentist approach [4] based on fits to large sets of Monte Carlo replicas [2]. Monte Carlo replicas are sets of cross-section values in the same (Q 2 , x) grid as data, generated by randomly varying cross-section predictions according to the data uncertainties.…”

Section: Quark Radius Analysis With Simultaneous Fit Proceduresmentioning

confidence: 99%

“…The combined e ± p cross sections were used in a QCD analysis at next-to-leading order, providing a set of parton distribution functions ZCIPDF [2], and in an analysis beyond the Standard Model using a new approach, performing simultaneous fits on large sets of Monte Carlo replicas of parton distribution functions, PDFs, together with the parameters of "new physics" processes. It allowed to estimate limits on the mass scales for different contact interaction scenarios extending up to 10 TeV and evaluate an upper limit on the effective quark radius of 0.43 · 10 −16 cm.…”

Section: Introductionmentioning

confidence: 99%

Limits on the effective quark radius from inclusive ep scattering and contact interactions at HERA

Turkot¹

2017

Proceedings of XXV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2017)

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The high-precision HERA data allow searches for "beyond the Standard Model" contributions to electron-quark scattering up to TeV scales. Combined H1 and ZEUS measurements of inclusive deep inelastic cross sections in neutral and charged current ep scattering are considered, corresponding to a luminosity of around 1 f b −1 . A new approach to the beyond the Standard Model analysis of the inclusive ep data is presented; simultaneous fits of parton distribution functions and contributions of "new physics" processes are performed. Considered are possible deviations from the Standard Model due to a finite radius of quarks, described within the quark form-factor model, and due to new electron-quark interactions in the framework of eeqq contact interactions (CI). The resulting 95% C.L. upper limit on the effective quark radius is 0.43 · 10 −16 cm. The limits on the CI mass scale extend up to 10 TeV depending on the CI scenario.

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Limits on the effective quark radius from inclusive ep scattering at HERA

Cited by 16 publications

References 10 publications

VHEeP: a very high energy electron–proton collider

VHEeP: a very high energy electron–proton collider

The ZEUS ong term data preservation project

Limits on the effective quark radius from inclusive ep scattering and contact interactions at HERA

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