total hadronic cross section
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2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Lina Alasfar ◽  
Giuseppe Degrassi ◽  
Pier Paolo Giardino ◽  
Ramona Gröber ◽  
Marco Vitti

Abstract We compute the next-to-leading virtual QCD corrections to the partonic cross section of the production of a Higgs boson in association with a Z boson in gluon fusion. The calculation is based on the recently introduced method of evaluating the amplitude via an expansion in terms of a small transverse momentum. We generalize the method to the case of different masses in the final state and of a process not symmetric in the forward-backward direction exchange. Our analytic approach gives a very good approximation (better than percent) of the partonic cross section in the center of mass energy region up to ∼ 750 GeV, where at the LHC ∼ 98% of the total hadronic cross section is concentrated.


2017 ◽  
Vol 32 (32) ◽  
pp. 1750184 ◽  
Author(s):  
D. A. Fagundes ◽  
M. J. Menon ◽  
P. V. R. G. Silva

Forward amplitude analyses constitute an important approach in the investigation of the energy dependence of the total hadronic cross-section [Formula: see text] and the [Formula: see text] parameter. The standard picture indicates for [Formula: see text] a leading log-squared dependence at the highest c.m. energies, in accordance with the Froissart–Lukaszuk–Martin bound and as predicted by the COMPETE Collaboration in 2002. Beyond this log-squared (L2) leading dependence, other amplitude analyses have considered a log-raised-to-gamma form [Formula: see text], with [Formula: see text] as a real free fit parameter. In this case, analytic connections with [Formula: see text] can be obtained either through dispersion relations (derivative forms), or asymptotic uniqueness (Phragmén–Lindelöff theorems). In this work, we present a detailed discussion on the similarities and mainly the differences between the Derivative Dispersion Relation (DDR) and Asymptotic Uniqueness (AU) approaches and results, with focus on the [Formula: see text] and L2 leading terms. We also develop new Regge–Gribov fits with updated dataset on [Formula: see text] and [Formula: see text] from [Formula: see text] and [Formula: see text] scattering, including all available data in the region 5 GeV–8 TeV. The recent tension between the TOTEM and ATLAS results at 7 TeV and mainly at 8 TeV is discussed and considered in the data reductions. Our main conclusions are the following: (1) all fit results present agreement with the experimental data analyzed and the goodness-of-fit is slightly better in case of the DDR approach; (2) by considering only the TOTEM data at the LHC region, the fits with L[Formula: see text] indicate [Formula: see text] (AU approach) and [Formula: see text] (DDR approach); (3) by including the ATLAS data the fits provide [Formula: see text] (AU) and [Formula: see text] (DDR); (4) in the formal and practical contexts, the DDR approach is more adequate for the energy interval investigated than the AU approach. A pedagogical and detailed review on the analytic results for [Formula: see text] and [Formula: see text] from the Regge–Gribov, DDR and AU approaches is presented. Formal and practical aspects related to forward amplitude analyses are also critically discussed.


2014 ◽  
Vol 35 ◽  
pp. 1460388 ◽  
Author(s):  
M. N. ACHASOV ◽  
V. M. AULCHENKO ◽  
A. YU. BARNYAKOV ◽  
K. I. BELOBORODOV ◽  
A. V. BERDYUGIN ◽  
...  

The preliminary results on multihadron processes obtained with the SND detector at the e+e− collider VEPP-2000 in the energy range from 1 to 2 GeV are presented. The results are interesting in connection with their contribution to the total hadronic cross section, the muon g-2 and a possibility to study excited vector mesons properties. The nucleon anti-nucleon production was also studied.


2012 ◽  
Vol 42 (5-6) ◽  
pp. 452-464 ◽  
Author(s):  
Daniel Almeida Fagundes ◽  
Marcio José Menon ◽  
Paulo Victor Recchia Gomes Silva

2007 ◽  
Vol 76 (7) ◽  
Author(s):  
D. Besson ◽  
T. K. Pedlar ◽  
D. Cronin-Hennessy ◽  
K. Y. Gao ◽  
J. Hietala ◽  
...  

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