scholarly journals Upsilon Transverse Momentum at Hadron Colliders

2005 ◽  
Vol 20 (16) ◽  
pp. 3753-3755 ◽  
Author(s):  
Edmond L. Berger ◽  
Jianwei Qiu ◽  
Yili Wang
Keyword(s):  
Perturbation Theory ◽  
Transverse Momentum ◽  
Strong Coupling ◽  
Cross Section ◽  
Impact Parameter ◽  
Hadron Colliders ◽  
Initial State ◽  
Small Impact ◽  
Small Impact Parameter ◽  
Perturbative Contribution

We predict the shape of the transverse momentum pT spectrum of ϒ production. The distribution at low pT is dominated by the region of small impact parameter b and may be computed reliably in perturbation theory. We resum to all orders in the strong coupling αs the process-independent large logarithmic contributions that arise from initial-state gluon showers in the small pT(≤ Mϒ) region. The cross section at large pT is represented by the [Formula: see text] lowest-order non-vanishing perturbative contribution.

scholarly journals USING 21 cm ABSORPTION IN SMALL IMPACT PARAMETER GALAXY-QUASAR PAIRS TO PROBE LOW-REDSHIFT DAMPED AND SUB-DAMPED Lyα SYSTEMS

2010 ◽  
Vol 713 (1) ◽  
pp. 131-145 ◽  
Author(s):  
Sanchayeeta Borthakur ◽  
Todd M. Tripp ◽  
Min S. Yun ◽  
Emmanuel Momjian ◽  
Joseph D. Meiring ◽  
...  
Keyword(s):  
Impact Parameter ◽  
Small Impact ◽  
Small Impact Parameter

Multiply differential ionization probabilities in small impact parameter ion-atom collisions

1990 ◽  
Author(s):  
G. Schiwietz ◽  
B. Skogvall ◽  
N. Stolterfoht ◽  
D. Schneider ◽  
V. Montemayor
Keyword(s):  
Impact Parameter ◽  
Small Impact ◽  
Small Impact Parameter
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