Journal Article

Measurement of the 1-jettiness event shape observable in deep-inelastic electron-proton scattering at HERA

Contreras, J. G., Gayler, J., Raicevic, N., Olsson, J. E., Katzy, J., Robmann, P., Tustin, G., Pitzl, D., Zohrabyan, H., Kiesling, C., Gal, C., Lin, J., Diaconu, C., Goerlich, L., Ravdandorj, T., Chekelian, V., Lipka, K., Janssen, T., Radescu, V., Kluth, S., Stöcker, L., Meyer, J., Boudry, V., Lange, W., Polifka, R., Arratia, M., Horisberger, R., Meyer, A. B., Sauter, M., Fedotov, A., Bolz, A., Rotaru, M., Roosen, R., Schoeffel, L., Laycock, P., Thompson, P. D., Campbell, A. J., Steder, M., Feltesse, J., Mehta, A., Vallée, C., Jung, A. W., Hessler, J., Wünsch, E., Henderson, R. C. W., Long, O. R., Favart, L., Patel, G. D., Baty, A., Fleischer, M., Zhang, J., Kostka, P., Schnell, G., Shushkevich, S., Sykora, T., Brandt, G., Buniatyan, A., Reimer, P., Schmookler, B. A., Zomer, F., Drees, A., Zhang, Z., Preins, S., Schöning, A., Tu, Z., Britzger, D., Mechelen, P. van, Sopicki, P., Avila, K. B. Cantun, Fomenko, A., Newman, P. R., Soloviev, Y., Andreev, V., Chen, Z., Cvach, J., Sun, C., Deshpande, A., Jacobs, P. M., Eckerlin, G., Cerny, K., Perez, E., Gouzevitch, M., Grindhammer, G., Egli, S., Maxfield, S. J., Sauvan, E., Kleinwort, C., Greenshaw, T., Reichelt, D

2024

Overview

The H1 Collaboration reports the first measurement of the 1-jettiness event shape observable τ 1 b in neutral-current deep-inelastic electron-proton scattering (DIS). The observable τ 1 b is equivalent to a thrust observable defined in the Breit frame. The data sample was collected at the HERA ep collider in the years 2003–2007 with center-of-mass energy of s = 319 GeV , corresponding to an integrated luminosity of 351.1  pb - 1 . Triple differential cross sections are provided as a function of τ 1 b , event virtuality Q 2 , and inelasticity y , in the kinematic region Q 2 > 150 GeV 2 . Single differential cross sections are provided as a function of τ 1 b in a limited kinematic range. Double differential cross sections are measured, in contrast, integrated over τ 1 b and represent the inclusive neutral-current DIS cross section measured as a function of Q 2 and y . The data are compared to a variety of predictions and include long-standing and more recent Monte Carlo event generators, predictions in fixed-order perturbative QCD where calculations up to O ( α s 3 ) are available for τ 1 b or inclusive DIS, and resummed predictions at next-to-leading logarithmic accuracy matched to fixed order predictions at O ( α s 2 ) . These comparisons reveal sensitivity of the 1-jettiness observable to QCD parton shower and resummation effects, as well as the modeling of hadronization and fragmentation. Within their range of validity, the fixed-order predictions provide a good description of the data. Monte Carlo event generators are predictive over the full measured range and hence their underlying models and parameters can be constrained by comparing to the presented data.

• Publisher: Springer Berlin Heidelberg,Springer,Springer Nature B.V,Springer Verlag (Germany),Springer Nature,SpringerOpen
• Subject: Analysis / Astronomy / Astrophysics and Cosmology / Cross-sections / Elasticity / Electrons / Elementary Particles / Generators / Hadrons / Heavy Ions / High Energy Physics - Experiment / High Energy Physics - Phenomenology / Inelastic scattering / Kinematics / Luminosity / Measurement / Measurement Science and Instrumentation / Nuclear Energy / Nuclear Experiment / Nuclear Physics / Parameter sensitivity / Partons / Physics / Physics and Astronomy / PHYSICS OF ELEMENTARY PARTICLES AND FIELDS / Predictions / Proton scattering / Quantum chromodynamics / Quantum Field Theories / Quantum Field Theory / Regular Article - Experimental Physics / String Theory