Inverse neutrinoless double beta decay reexamined.

We critically reexamine the prospects for the observation of the {Delta}{ital L}=2 lepton-number-violating process {ital e}{sup {minus}}{ital e}{sup {minus}}{r_arrow}{ital W}{sup {minus}}{ital W}{sup {minus}} using the {ital e}{sup {minus}}{ital e}{sup {minus}} option of a high-energy {ital e}{sup +}{ital e}{sup {minus}} collider (NLC). We find that, except in the most contrived scenarios, constraints from neutrinoless double {beta} decay render the process unobservable at an NLC of {radical}{ital s}{lt}2 TeV. Other {Delta}{ital L}=2 processes such as {gamma}{gamma}{r_arrow}l{sup +}l{sup +}{ital W}{sup {minus}}{ital W}{sup {minus}}, {ital e}{sup {minus}}{gamma}{r_arrow}{nu}{sub {ital e}}l{sup {minus}}l{sup {minus}}{ital W}{sup +}, {ital e}{sup {minus}}{ital e}{sup {minus}} {r_arrow}{nu}{sub {ital e}}{nu}{sub {ital e}}l{sup {minus}}l{sup {minus}} (l={mu},{tau}), and {ital e}{sup {minus}}{gamma}{r_arrow}{ital e}{sup +}{ital W}{sup {minus}}{ital W}{sup {minus}}, which use various options of the NLC, require a {radical}{ital s} of at least 4 TeV for observability. {copyright} {ital 1996 The American Physical Society.}