Color glass condensate at next-to-leading order meets HERA data
We perform the first dipole picture fit to HERA inclusive cross section data using the full next-to-leading order (NLO) impact factor combined with an improved Balitsky-Kovchegov evolution including the dominant effects beyond leading logarithmic accuracy at low $x$. We find that three different formulations of the evolution equation that have been proposed in the recent literature result in a very similar description of HERA data, and robust predictions for future deep inelastic scattering experiments. We find evidence pointing towards a significant nonperturbative contribution to the structure function for light quarks, which stresses the need to extend the NLO impact factor calculation t…
Factorization of the soft gluon divergence from the dipole picture deep inelastic scattering cross sections at next-to-leading order
We use a factorization scheme analogous to one proposed for single inclusive forward hadron production to factorize the soft gluon divergence present in the deep inelastic scattering cross sections in the dipole picture at next-to-leading order (NLO). We show numerically that in this carefully constructed scheme it is possible to obtain meaningful results for the DIS cross sections at NLO, and so we are able to quantitatively study the recently derived NLO corrections to the DIS cross sections. We find that the NLO corrections can be significant and sensitive to the details of the factorization scheme used for the resummation of the large logarithms into the BK evolution equation. In the ca…
Proton Structure Functions at Next-to-Leading Order in the Dipole Picture with Massive Quarks
We predict heavy quark production cross sections in deep inelastic scattering at high energy by applying the color glass condensate effective theory. We demonstrate that, when the calculation is performed consistently at next-to-leading order accuracy with massive quarks, it becomes possible, for the first time in the dipole picture with perturbatively calculated center-of-mass energy evolution, to simultaneously describe both the light and heavy quark production data at small xBj. Furthermore, we show how the heavy quark cross section data provides additional strong constraints on the extracted nonperturbative initial condition for the small-xBj evolution equations.
Next-to-leading order corrections to deep inelastic scattering structure functions at small Bjorken-x
Syvän epäelastisen sironnan kokeellisia tuloksia on kuvattu onnistuneesti pie- nillä Bjorkenin x:n arvoilla käyttämällä sironnan dipolimallia ja johtavan kerta- luvun valokartiohäiriöteoriaa. On tärkeää selvittää, paraneeko teorian kuvaavuus tutkimalla vaikutuksia korkeampien kertalukujen häiriöteoriasta. Mittaustulosten kuvauksen parantamiseksi tässä työssä johdetaan korjauksia johtavan kertaluvun vaikutusalaan ja rakennefunktioihin häiriöteorian toisessa ker- taluvussa. Tämän toteuttamiseksi esitellään tarvittavassa määrin valokartiokvant- tikenttäteoria, pienen Bjorken-x sironnan dipolimalli ja häiriöteoriaa. Johdettu toi- sen kertaluvun vaikutusalala sisältää pehmeän divergenssin proses…