Hard gluon emission from colored scalar pairs in e+e- annihilation.
نویسندگان
چکیده
We study QCD correction to the pair production of colored scalar particles in electron-positron annihilation with an emphasis on gluon emission in the final state. We discuss the usefulness of working in a “quasi-two-body” frame and present the helicity amplitudes for the process. We compare the final state configuration with fermion pair production and find that the three-jet fraction for the scalars shows quantitative difference from that for fermions.
منابع مشابه
Perturbative and non-perturbative aspects of moments of the thrust distribution in e+e− annihilation∗
Resummation and power-corrections play a crucial role in the phenomenology of event-shape variables like the thrust T . Previous investigations showed that the perturbative contribution to the average thrust is dominated by gluons of small invariant mass, of the order of 10% of Q, where Q is the center-of-mass energy. The effect of soft gluons is also important, leading to a non-perturbative 1/...
متن کاملTHE REACTION e + e − → t¯tg AT NEXT-TO-LEADING ORDER IN αs ∗
The production of top quark pairs together with a hard gluon in e + e − annihilation is studied including next-to-leading order corrections in the strong coupling. 1 Motivation The production of top quark pairs in association with (at least) one additional parton X carrying a hard momentum k X , e + (p +) + e − (p −) → t(k t) + ¯ t(k¯ t) + X(k X), (1) is interesting for several reasons: A compa...
متن کاملSinglet scalar dark matter in noncommutative space
In this paper, we examine the singlet scalar dark matter annihilation to becoming the Standard Model particles in the non-commutative space. In the recent decades, many candidates of dark matter have been offered, but our information about the nature of dark matter is still limited. There are such particle candidates as scalar matetr, fermion, boson, gauge boson, etc.; however, they have nei...
متن کاملHeavy Quark Pair Multiplicity in E + E ? Events
We calculate the multiplicity of heavy quark pairs in e + e ? annihilation events, which arises from perturbative gluon splitting. Our result is exact to leading order in s ; and resums large leading and next-to-leading logarithmic terms to all orders. We compare our results with Monte Carlo models, and nd reasonable agreement with those based on the parton shower approach.
متن کاملGluon-Gluon Antenna Functions from Higgs Boson Decay
Antenna functions describe the infrared singular behaviour of colour-ordered QCD matrix elements due to the emission of unresolved partons inside an antenna formed by two hard partons. In this paper, we show that antenna functions for hard gluon-gluon pairs can be systematically derived from the effective Lagrangian describing Higgs boson decay into gluons, and compute the the infrared structur...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review. D, Particles and fields
دوره 54 3 شماره
صفحات -
تاریخ انتشار 1996