Skip to main content

Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

Measurability of pressure inside the proton

The Original Article was published on 16 May 2018

This is a preview of subscription content, access via your institution

Relevant articles

Open Access articles citing this article.

Access options

Buy article

Get time limited or full article access on ReadCube.

$32.00

All prices are NET prices.

Fig. 1: Imaginary (left) and real (right) part of H\(\left({\boldsymbol{\xi }},{\boldsymbol{t}}){\boldsymbol{.}}\right)\)

Data availability

The experimental data used in this work are publicly available at http://clasweb.jlab.org/physicsdb. A Fourier transformed version of these data is available at https://github.com/openhep/dterm18.

Code availability

The code used for the analysis is available at https://github.com/openhep/dterm18. This code is to be used together with the neural network software package PyBrain13 and the software implementation of formulas for DVCS cross-sections by Belitsky et al.14.

References

  1. Burkert, V. D., Elouadrhiri, L. & Girod, F. X. The pressure distribution inside the proton. Nature 557, 396–399 (2018).

    Article  CAS  ADS  Google Scholar 

  2. Kumerički, K. & Müller, D. Deeply virtual Compton scattering at small x B and the access to the GPD H. Nucl. Phys. B 841, 1–58 (2010).

    Article  ADS  Google Scholar 

  3. Polyakov, M. V. Generalized parton distributions and strong forces inside nucleons and nuclei. Phys. Lett. B 555, 57–62 (2003).

    Article  CAS  ADS  MathSciNet  Google Scholar 

  4. Polyakov, M. V. & Weiss, C. Skewed and double distributions in pion and nucleon. Phys. Rev. D 60, 114017 (1999).

    Article  ADS  Google Scholar 

  5. Teryaev, O. V. Analytic properties of hard exclusive amplitudes. Preprint at http://arXiv.org/abs/hep-ph/0510031 (2005).

  6. Polyakov, M. V. & Son, H.-D. Nucleon gravitational form factors from instantons: forces between quark and gluon subsystems. J. High Energ. Phys. 2018, 156 (2018).

    Article  Google Scholar 

  7. Polyakov, M. V. & Schweitzer, P. Forces inside hadrons: pressure, surface tension, mechanical radius, and all that. Int. J. Mod. Phys. A 33, 1830025 (2018).

    Article  CAS  ADS  Google Scholar 

  8. Anikin, I. V. et al. Nucleon and nuclear structure through dilepton production. Acta Phys. Pol. B 49, 741–784 (2018).

    Article  ADS  MathSciNet  Google Scholar 

  9. Kumerički, K., Müller, D. & Schäfer, A. Neural network generated parametrizations of deeply virtual Compton form factors. J. High Energ. Phys. 2011, 073 (2011).

    Article  Google Scholar 

  10. Girod, F. X. et al. Measurement of deeply virtual Compton scattering beam-spin asymmetries. Phys. Rev. Lett. 100, 162002 (2008).

    Article  CAS  ADS  Google Scholar 

  11. Jo, H. et al. Cross sections for the exclusive photon electroproduction on the proton and generalized parton distributions. Phys. Rev. Lett. 115, 212003 (2015).

    Article  CAS  ADS  Google Scholar 

  12. Dupré, R., Guidal, M., Niccolai, S. & Vanderhaeghen, M. Analysis of deeply virtual Compton scattering data at Jefferson Lab and proton tomography. Eur. Phys. J. A 53, 171 (2017).

    Article  ADS  Google Scholar 

  13. Schaul, T. et al. PYBRAIN. J. Mach. Learn. Res. 11, 743–746 (2010).

    Google Scholar 

  14. Belitsky, A. V., Müller, D. & Ji, Y. Compton scattering: from deeply virtual to quasi-real. Nucl. Phys. B 878, 214–268 (2014).

    Article  CAS  ADS  MathSciNet  Google Scholar 

Download references

Acknowledgements

I thank V. D. Burkert, F. X. Girod, D. Müller, M. Polyakov and P. Schweitzer for discussions. This work is supported by the Croatian Science Foundation under project number 8799 and by the QuantiXLie Center of Excellence through grant KK.01.1.1.01.0004.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Krešimir Kumerički.

Ethics declarations

Competing interests

The author declares no competing interests.

Additional information

Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Kumerički, K. Measurability of pressure inside the proton. Nature 570, E1–E2 (2019). https://doi.org/10.1038/s41586-019-1211-6

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1038/s41586-019-1211-6

This article is cited by

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.

Search

Quick links

Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing