Laravel Keyup function not working

I need to get some values from the database after entering a value in a text field, but nothing happens. Here is my code:

<div class="form-group">
    <label>Entrez le numéro de série</label>
    <input type="text" name="n_serie" required="required" class="form-control" />
</div>
<div class="form-group">
    <label>Panne signalée</label>
    <span id="panne"></span>
</div>

$('#n_serie').keyup(function(){
            event.preventDefault();
            var form_data = $(this).serialize();
            $.ajax({
                url:"{{ route('Reparation.getPanne') }}",
                method:"GET",
                data:form_data,
                dataType:"json",
                success:function(data)
                {
                    $('#panne').html(data.success);
                }
            });
        });